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33results about How to "Solve capacity fading" patented technology
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Use of crosslinking type polybenzimidazole porous separating membrane in liquid flow battery
InactiveCN104716352AImprove oxidation stabilityHigh selectivityCollectors/separatorsUltrasound attenuationPhysical chemistry
The invention relates to use of a crosslinking type polybenzimidazole porous separating membrane in a liquid flow battery, and the porous membrane material is a crosslinking type polybenzimidazole polymer material. The porous membrane prepared by the invention is used in the liquid flow battery, by use of a cross-linking method and controlling of the crosslinking reaction, the membrane material oxidation stability and ion selectivity can be improved, the function of an ion exchange membrane in the liquid flow battery can be realized, the problem of capacity attenuation of a porous diaphragm can be effectively solved, the aperture of the porous membrane can be further regulated by change of variety of the polymer and the crosslinking agent of the composite membrane, ion selectivity of the porous membrane can be effectively improved, and the membrane material has the advantages of simple preparation method, controllable pore size, low cost, and easy implementation of large batch production.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Flow battery system and capacity re-balance method for flow battery
PendingCN107425212ASolve capacity fadingSolve the problem of electrolyte volume imbalanceElectrolyte stream managementRegenerative fuel cellsEngineeringStorage tank
The invention provides a flow battery system and a capacity re-balance method for a flow battery. The flow battery system comprises a flow battery unit, a positive electrode electrolyte storage tank and a negative electrode electrolyte storage tank; the flow battery system also comprises a co-mixing equipartition module; the co-mixing equipartition module comprises an electrolyte co-mixing unit and an electrolyte equipartition unit, wherein the electrolyte co-mixing unit is connected with a positive electrode outlet, a negative electrode outlet, the inlet of the positive electrode electrolyte storage tank and the inlet of the negative electrode electrolyte storage tank separately for co-mixing the electrolyte in the positive electrode electrolyte storage tank and the negative electrode electrolyte storage tank; and the electrolyte equipartition unit is connected with the outlet of the positive electrode electrolyte storage tank, the outlet of the negative electrode electrolyte storage tank, a positive electrode inlet and a negative electrode inlet for performing equipartition on the electrolyte in the positive electrode electrolyte storage tank and the negative electrode electrolyte storage tank. By performing co-mixing and equipartition treatment on the positive and negative electrode electrolyte, the problem of capacity fading caused by imbalance of vanadium ion total quantity in the positive and negative electrode electrolyte and the problem of electrolyte volume imbalance caused by water migration are solved.
Owner:中国东方电气集团有限公司
Gel polymer energy storage lithium ion battery and preparation method thereof
InactiveCN103682417AIncrease working voltageIncrease specific energyCell electrodesFinal product manufactureElectrical batteryPolymer coatings
The invention relates to the technical field of lithium ion batteries, in particular to a gel polymer energy storage lithium ion battery and a preparation method thereof. The gel polymer energy storage lithium ion battery comprises a positive plate, a negative plate, a separation film, a bath solution and an aluminum plastic film housing, wherein the positive plate and the negative plate are wound by the separation film, and are placed in the bath solution; the aluminum plastic film housing is used for accommodating the positive plate, the negative plate, the separation film and the bath solution; in addition, (1) the cathode material of the positive plate is formed by a positive active material, an anode conductive agent and an anode binder; (2) the anode material of the negative plate is formed by a negative active material, a cathode conductive agent and a cathode binder; (3) the separation film is a gel polymer coating separation film. The lithium ion battery provided by the invention is long in cycle life, high in safety performance, high in specific energy and low in fabricating cost, and can be used for various energy storage devices.
Owner:深圳市迪凯特电池科技有限公司
Preparation method for hollow micro-structure Co3S4@MoS2 of lithium ion battery negative electrode by MOF template
InactiveCN108878854ASolve capacity fadingHigh purityMaterial nanotechnologyNegative electrodesLithium electrodeHydrothermal reaction
The invention relates to the technical field of preparation of a nanometer material, in particular to a preparation method for a hollow micro-structure Co3S4@C@MoS2 of a lithium ion battery negative electrode by an MOF template. The method comprises the following steps of (1) preparing a ZIF-67 precursor template by a solution method; (2) coating the prepared ZIF-67 template with organic carbon ina solution; (3) performing high-temperature sintering on a product in an atmosphere furnace; (4) dispersing the sintered product in a salt solution; (5) performing hydrothermal reaction on a mixed solution, and collecting the product; (6) annealing the product to prepare a hollow Co3S4@C@MoS2-heterojunction structure. The method is simple, is convenient to operate, and is good in repeatability and high in product purity; and the prepared hollow Co3S4@C@MoS2-heterojunction structure has favorable performance when used as a lithium ion battery.
Owner:SOUTHWEAT UNIV OF SCI & TECH
Negative electrode material for lithium ion secondary battery, negative electrode sheet, and lithium ion secondary battery
InactiveCN110931764AImprove electronic conductivitySmall volume changeGraphiteCell electrodesElectrical batteryCarbon nanotube
The invention discloses a negative electrode material and a negative electrode sheet of a lithium ion secondary battery, and the lithium ion secondary battery. According to the preparation method, a silicon-based negative electrode active material and a graphite negative electrode active material are compounded to serve as a negative electrode active material, the silicon-based negative electrodeactive material takes a high-capacity silica material SiOx as a core, and the surface of the silicon-based negative electrode active material is coated with a carbon active substance; and meanwhile, conductive agents such as single-walled carbon nanotubes are added into the negative electrode material. Through the arrangement, the energy density of the lithium ion secondary battery can be improved, the electronic conductivity of the silicon-oxygen material is improved, the volume change of the silicon-oxygen material in battery circulation is favorably buffered, meanwhile, the first coulombicefficiency of the silicon-oxygen material is improved, and the problems of low first coulombic efficiency and poor rate capability of the silicon-oxygen material can be effectively solved.
Owner:SHENZHEN BAK POWER BATTERY CO LTD
Method and system for evaluating redox flow battery
InactiveCN104835975ASolve capacity fadingImprove reliabilityElectrolyte stream managementRegenerative fuel cellsRedoxState of charge
A system for evaluating a redox flow battery according to an embodiment of the present disclosure includes: a control unit configured to control the path of a flow channel connected between a detection cell and the redox flow battery or a flow channel connected between the detection cell and an agitator; and an evaluation unit configured to evaluate any one of the state of charge, capacity fade and oxidation number balance of an electrolyte, which is used in the redox flow battery, by measuring a current or voltage of the detection cell based on the controlling of the path by the control unit. According to the present disclosure, the capacity fade problem of a redox flow battery can be quickly coped with by evaluating the information of the positive and negative electrode electrolytes on battery capacity fade and information about the valence balance of the electrolytes in situ.
Owner:OCI
Difunctional composite porous membrane and preparation and application thereof
ActiveCN104300101AImproves ion transmissionHigh selectivityCell seperators/membranes/diaphragms/spacersPolymer resinSulfonated polymer
The invention discloses a composite porous membrane liquid flow battery and its application in preparation of liquid flow in a battery, by one or more than two kinds of as prepared porous membrane organic polymer resin or sulfonated polymer resin as matrix, respectively on two sides of the matrix composite Yang, anionic organic resin to form a composite porous membrane.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Nanometer zinc oxide/porous carbon in-situ composite high-capacity lithium ion battery material and preparation method thereof
InactiveCN107464923ASimple processStrong controllabilityCell electrodesSecondary cellsOxideLithium electrode
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY
Nitrogen and sulfur co-doped three-dimensional graphene and transition metal sulfide composite material, as well as universal preparation method and application thereof
InactiveCN109950512AParticle controllableUniform sizeCell electrodesSecondary cellsDoped grapheneMetallic sulfide
The invention discloses a nitrogen and sulfur co-doped three-dimensional graphene and transition metal sulfide composite material, as well as a universal preparation method and application thereof. According to the invention, the thiocyanuric acid is adopted as a nitrogen and sulfur doping agent, a three-dimensional graphene soft mold agent and a transition metal vulcanizing agent. The hydrothermal-heat treatment method is adopted to realize the simultaneous and in-situ construction of a composite structure of a transition metal sulfide completely coated with doped graphene. The metal sulfideis completely coated with nitrogen and sulfur co-doped graphene. According to the structural design, the problem of capacity attenuation caused by volume expansion of transition metal sulfide in the lithium storage or sodium storage process can be obviously solved. The preparation method is safe in process and easy to operate, wherein the mass production can be achieved. The prepared composite material can be used as a lithium ion battery and sodium ion battery negative electrode active material.
Owner:SHAANXI UNIV OF SCI & TECH
Method for prolonging cycle life of lithium ion battery by piezoelectric ceramic
InactiveCN106920997ASolve capacity fadingImprove reversibilitySecondary cells servicing/maintenanceLithium electrodeLithium cobalt oxide
The invention provides a method for prolonging cycle life of a lithium ion battery by piezoelectric ceramic. A small quantity of piezoelectric ceramic crystals are adopted in preparation of a precursor of a positive electrode material of a lithium battery; and when lithium ions are in mobility, the piezoelectric ceramic crystals, which suffer from an external electric field effect, generate mechanical deformation so as to suppress structural changes of lithium cobalt oxides, lithium manganate, lithium iron phosphate, lithium nickel cobalt phosphate and other lithium ion positive electrode materials in a cyclic charging-discharging process. Therefore, the problem of capacity fading of the electrode material in a cyclic process is solved fundamentally, the reversibility of the cyclic charging-discharging process is improved, and the cycle life is greatly prolonged; and in addition, lithium ions can pass freely and high electric conductivity is achieved, so that the initial efficiency and the rate capability of the lithium battery are improved.
Owner:CHENDU NEW KELI CHEM SCI CO LTD
High-capacity TiO2-VO2 doped hollow carbon nanofiber lithium battery negative electrode material and preparation method thereof
InactiveCN108346787AImprove permeabilityEasy to embedMaterial nanotechnologyCell electrodesNanoparticleCarbon nanofiber
The invention discloses a high-capacity TiO2-VO2-doped hollow carbon nanofiber lithium battery negative electrode material and a preparation method thereof. The high-capacity TiO2-VO2-doped hollow carbon nanofiber lithium battery negative electrode material comprises 10-80.0 wt% of TiO2 nanoparticles and 0.1-20.0 wt% of VO2 nanoparticles coating the outer surface of the hollow carbon nanofiber andbalance of hollow carbon nanofiber; and the high-capacity TiO2-VO2-doped hollow carbon nanofiber lithium battery negative electrode material has multi-stage pore structure and high load, is beneficial to electrolyte in-penetration, and is conducive to lithium ion embedding and electron transport. The conductivity, specific capacity and stability of the negative electrode material are improved, and the negative electrode material has excellent rate performance and cycle performance.
Owner:ZHEJIANG FOREVER NEW ENERGY TECH CO LTD +1
Electrolyte storage tank, redox flow battery, box-type redox flow battery system and charge-discharge control method of redox flow battery
ActiveCN107195942ASpeed up the flowIncrease profitReactant parameters controlRegenerative fuel cellsRedoxEngineering
The invention discloses an electrolyte storage tank, a redox flow battery, a box-type redox flow battery system and a charge-discharge control method of redox flow battery. A ring tube I and a ring tube II are arranged in the electrolyte storage tank, wherein the ring tube II communicates with an electrolyte return hole, the ring tube I communicates with an electrolyte output, the annular perimeter of the ring tube I is not equal to the annular perimeter of the ring tube II, and a plurality of liquid holes are formed in tube walls of both of the annular tube I and the annular tube II. By a multi-layer ring tube structure in the storage tank, an electrolyte flowing dead zone of an electrolyte in the storage tank is greatly reduced, the flowing of the electrolyte is more uniform, and the utilization of the electrolyte is effectively improved; and moreover, since the longitudinal distance between the electrolyte output and the electrolyte return hole is reduced, the problem of SOC lag is effectively solved, and the SOC monitoring accuracy of the redox flow battery is improved.
Owner:DALIAN RONGKE POWER
All-vanadium redox flow battery capacity recovery method
ActiveCN106876814ASolve capacity fadingSimple processRegenerative fuel cellsSecondary cells charging/dischargingAmmonium sulfateIon
The invention relates to an all-vanadium redox flow battery capacity recovery method and particularly aims at solving the problem that battery capacity is faded due to accumulation of positive pentavalent vanadium when an all-vanadium redox flow battery operates for a long time. According to the method, appropriate amount of ammonium ferrous sulfate can be added to a positive electrolyte in a battery charge and discharge random process, so the ammonium ferrous sulfate reacts with pentavalent vanadium ions in the positive electrolyte, the pentavalent vanadium ions are restored into tetravalent vanadium ions and a battery capacity is recovered. According to the method, the appropriate amount of ammonium ferrous sulfate is added to the positive electrolyte as reductant, the pentavalent vanadium accumulation problem when the battery operates for a long time, the capacity fading problem is finally solved, so the battery can operates stably for a long time and the electrolyte is efficiently utilized. The method is simple in technology, simple and convenient in operation, low in cost and remarkable in effect; and raw materials are simple and easy to get.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Nitrogen-oxygen double-doped porous hollow bowl-shaped carbon material and preparation method thereof
ActiveCN110255999AIncrease interplanar spacingStable structureCell electrodesCarbon preparation/purificationDispersitySodium-ion battery
The invention belongs to the technical field of inorganic material preparation and battery materials, and relates to a carbon-oxygen double-doped porous hollow bowl-shaped carbon material and a preparation method thereof. The material is carbon bowl-shaped structure particles, which are high in dispersity, narrow in particle size distribution and controllable in particle size; a hollow structure exists in the particles, the appearance is in a concave bowl shape, and the wall thickness is controllable; a plurality of holes are formed in the bowl wall and comprise micropores and mesopores, so that the specific surface area is high. The material has the characteristic of double doping of nitrogen and oxygen elements, and can be used for a potassium ion battery negative electrode with high volume specific capacity and cycling stability. Due to the characteristics of rich potassium global reserve and low oxidation-reduction voltage value, the potassium ion battery is considered to be one of traditional high-price lithium ion battery candidates; however, the size of potassium ions is large, so that the potassium ion battery electrode material with high specific capacity and good cycling stability and rate capability is lacked in the prior art. The material is used for potassium ion battery electrodes, and the purposes of enhancing the stability of the potassium ion battery, improving the rate capability and improving the volume specific capacity of the battery are achieved.
Owner:UNIV OF SCI & TECH BEIJING
Temperature regulation method of liquid metal battery in energy storage application
ActiveCN108493522ASolve lossSolve capacity fadingCell temperature controlSecondary cells charging/dischargingSolubilityElectrical battery
The invention belongs to the field of large-scale electrical energy storage of liquid metal batteries, and discloses a temperature regulation method for reducing battery capacity attenuation and lowering energy consumption by reducing the temperature of an electric pile in a suspend mode of a liquid metal battery in energy storage application. The temperature regulation method comprises the following steps: (a), detecting the temperature of the liquid metal battery by using temperature detecting equipment to obtain the current temperature thereof; (b), reducing the current temperature of the liquid metal battery and monitoring the current temperature in real time, and converting electrodes and an electrolyte in the liquid metal battery from a liquid phase to a colloidal state or solid phase so as to reduce the solubility of the electrodes in the electrolyte and lower the energy consumption of the liquid metal battery; (c), when the current operating temperature is reduced to 25 DEG C to the operating working temperature range, stopping reduction in the current operating temperature, and meanwhile maintaining the final temperature of the liquid metal battery at the current operatingtemperature. By the temperature regulation method, the battery capacity attenuation in the suspend mode of the liquid metal battery is reduced and additional electrical energy loss is reduced.
Owner:HUAZHONG UNIV OF SCI & TECH
Positive electrode active material and preparation method thereof, and lithium secondary battery
ActiveCN111600016AImprove cycle stabilityPromote fragmentationCell electrodesSecondary cellsLanthanideLithium intercalation
The embodiment of the invention provides a positive electrode active material, which comprises a secondary particle formed by tightly stacking a plurality of primary particles, wherein closed pores are formed in the primary particles, the sizes of the closed pores are within the range of 1 to 300 nm, the primary particle comprises a compound LicNiaCobM1-a-bO2-dXd, M is selected from one or more ofMn, Al, Na, Mg, Ca, Zr, Sr, Ti, Cr, V, W, Si, Ga, Sn, lanthanide series elements and actinide series elements, X is selected from one or more of B, F, Cl and S, a is greater than or equal to 0 and less than or equal to 1, b is greater than or equal to 0 and less than or equal to 1, c is greater than or equal to 0.8 and less than or equal to 1.5, and d is greater than or equal to 0 and less than or equal to 0.5. According to the invention, the closed pores in the primary particles of the positive electrode active material can effectively release internal stress caused by volume change of the material in the lithium intercalation and deintercalation process, so that the cycling stability of the positive electrode active material is improved. The embodiment of the invention also provides a preparation method of the positive electrode active material, and a lithium secondary battery.
Owner:HUAWEI TECH CO LTD
A temperature control method for liquid metal batteries in energy storage applications
ActiveCN108493522BSolve lossSolve capacity fadingCell temperature controlSecondary cells charging/dischargingSolubilityElectrical battery
The invention belongs to the field of large-scale electrical energy storage of liquid metal batteries, and discloses a temperature regulation method for reducing battery capacity attenuation and lowering energy consumption by reducing the temperature of an electric pile in a suspend mode of a liquid metal battery in energy storage application. The temperature regulation method comprises the following steps: (a), detecting the temperature of the liquid metal battery by using temperature detecting equipment to obtain the current temperature thereof; (b), reducing the current temperature of the liquid metal battery and monitoring the current temperature in real time, and converting electrodes and an electrolyte in the liquid metal battery from a liquid phase to a colloidal state or solid phase so as to reduce the solubility of the electrodes in the electrolyte and lower the energy consumption of the liquid metal battery; (c), when the current operating temperature is reduced to 25 DEG C to the operating working temperature range, stopping reduction in the current operating temperature, and meanwhile maintaining the final temperature of the liquid metal battery at the current operatingtemperature. By the temperature regulation method, the battery capacity attenuation in the suspend mode of the liquid metal battery is reduced and additional electrical energy loss is reduced.
Owner:HUAZHONG UNIV OF SCI & TECH
Zinc oxide microsphere, electrode and preparation method thereof
ActiveCN113135586AEasy to prepareIncrease contact areaZinc oxides/hydroxidesCell electrodesGlyceric acidElectrical battery
The invention discloses a zinc oxide microsphere, an electrode and a preparation method thereof, and the preparation method of the zinc oxide microsphere comprises the following steps: 1) preparing a mixed solution; 2) reacting the mixed solution to prepare zinc-based glycerate; and 3) calcining the zinc-based glycerate to prepare zinc oxide microspheres. The zinc oxide microspheres which are controllable in size, controllable in internal structure and uniform in size are prepared through a simple solvothermal method by utilizing the reaction of the zinc salt, the glycerol and the isopropanol which are low in price. When the zinc oxide microsphere is used as a lithium ion battery negative electrode material, an electrochemical test result shows that the zinc oxide microsphere has high specific discharge capacity and excellent cycle performance. According to the method, expansion and shrinkage of zinc oxide in the charging and discharging process are effectively relieved, the problem of capacity fading caused by the volume effect can be effectively solved, and good cycle performance is achieved.
Owner:INNER MONGOLIA UNIVERSITY
Electrolyte for flow battery and polyhalide-chromium flow battery
ActiveCN112599829AHigh reactivityHigh electrochemical redox activityRegenerative fuel cellsElectrolytic agentChromium(III) hydroxide
The invention discloses an electrolyte for a flow battery and a polyhalide-chromium flow battery. The electrolyte for the flow battery is prepared by reacting cheap and easily available chromium hydroxide with hydrochloric acid and hydrobromic acid. Before charging (the state of charge is 0%), the components of the positive and negative electrolyte are consistent, and include trivalent chromium ions, chloride ions, bromide ions and hydrogen ions. The electrolyte has the beneficial effects that: the electrolyte for the flow battery has the advantages of high energy density, low cost, high charging and discharging performance, long cycle life, wide operating temperature interval and the like, and has a wide application prospect in the field of fixed large-scale power storage.
Owner:SOUTHWEST JIAOTONG UNIV
A kind of preparation method of flexible lithium ion battery and network lithium titanate electrode structure
ActiveCN103715461BRealize the magnification characteristicImprove performanceCell electrodesFinal product manufactureElectrical batteryDimethyl siloxane
The invention discloses a preparation method of a flexible lithium ion battery and a network lithium titanate electrode structure. The preparation method of the flexible lithium-ion battery includes: growing a network lithium titanate on a titanium sheet as a negative electrode material; making a coated lithium manganate nanorod as a positive electrode material; The sandwich shape is stacked together and placed in the middle of two layers of polydimethylsiloxane PDMS films for packaging to complete the preparation of flexible lithium-ion batteries. The flexible lithium-ion battery disclosed in the present invention adopts network-structured lithium titanate, which can make full use of the advantages of the one-dimensional structure and the three-dimensional network structure, and increase the contact area between the active material and the electrolyte. The flexible lithium-ion battery disclosed by the invention can maintain high stability in a bent state, and realize dozens of charging and discharging cycles.
Owner:INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
Flow battery charging and discharging control method and system thereof, and flow battery
ActiveCN107195943BOptimizing the SOC usage rangeReduced Reaction PolarizationRegenerative fuel cellsBattery capacityBattery cell
The invention discloses a charge-discharge control method and system of a redox flow battery and the redox flow battery. The method comprises the following steps of 1, detecting SOC of the redox flow battery; 2, judging whether the SOC of the redox flow battery is between an SOC lower limit and an SOC upper limit or not, if yes, executing the step 3, otherwise executing the step 4; 3, maintaining a voltage of the redox flow battery unchanged; and 4, adjusting the voltage of the redox flow battery to be lower than a first preset voltage when the SOC of the redox flow battery is larger than or equal to the SOC upper limit, and adjusting the voltage of the redox flow battery to be between the first preset voltage and a second preset voltage when the SOC of the redox flow battery is smaller than or equal to the SOC lower limit, wherein the second preset voltage is higher than the first preset voltage. By the method, the problems of side reaction is easy to generate in the redox flow battery under a high SOC condition and capacity attenuation of the redox flow battery caused by high SOC charge for a long time are prevented, and meanwhile, the upper limit of a charging voltage can be increased under a low SOC condition so as to improve charging quantity.
Owner:DALIAN RONGKE POWER
A kind of silicon carbon negative electrode material for lithium ion battery and preparation method thereof
ActiveCN110429257BInhibition of volume changeEasy capacity fading problemMaterial nanotechnologySecondary cellsCarbon layerArgon atmosphere
Owner:河南电池研究院有限公司 +1
A kind of bifunctional composite porous membrane and its preparation and application
ActiveCN104300101BImproves ion transmissionHigh selectivityCell seperators/membranes/diaphragms/spacersPolymer resinPolymer science
The invention discloses a preparation of a composite porous membrane for a flow battery and its application in a flow battery, which is prepared from one or more than two kinds of organic polymer resin or sulfonated polymer resin as raw materials The porous membrane is used as a matrix, and cationic and anionic organic resins are respectively compounded on both sides of the matrix to form a composite porous membrane. The preparation method of this type of composite membrane is simple, the process is environmentally friendly, the thickness of the assembled layer is controllable, and the ion selectivity is adjustable. Compared with the original porous diaphragm membrane, the composite membrane has better ion conductivity and vanadium ion barrier ability, and the ion selectivity is greatly improved. In addition, the composite membrane can effectively inhibit the migration of electrolyte solution and solve the problem of capacity fading.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
A kind of positive electrode active material and its preparation method and lithium secondary battery
An embodiment of the present invention provides a positive electrode active material, including secondary particles formed by densely packing a plurality of primary particles, the interior of the primary particles includes closed pores, the size of the closed pores is in the range of 1nm-300nm, and the primary particles contain the compound Li c Ni a co b m 1‑a‑ b o 2‑d x d , wherein, M is selected from one or more of Mn, Al, Na, Mg, Ca, Zr, Sr, Ti, Cr, V, W, Si, Ga, Sn, lanthanides and actinides, and X is selected from From one or more of B, F, Cl and S, 0≤a≤1, 0≤b≤1, 0.8≤c≤1.5, 0≤d≤0.5. The closed pores inside the primary particles of the positive electrode active material can effectively release the internal stress caused by the volume change of the material during the lithium intercalation and deintercalation process, and improve the cycle stability of the positive electrode active material. The embodiment of the present invention also provides a preparation method of the positive electrode active material and a lithium secondary battery.
Owner:HUAWEI TECH CO LTD
Electrolyte storage tank, flow battery, box-type flow battery system, and charge and discharge control method for flow battery
ActiveCN107195942BSpeed up the flowIncrease profitReactant parameters controlRegenerative fuel cellsRedoxCharge discharge
The invention discloses an electrolyte storage tank, a redox flow battery, a box-type redox flow battery system and a charge-discharge control method of redox flow battery. A ring tube I and a ring tube II are arranged in the electrolyte storage tank, wherein the ring tube II communicates with an electrolyte return hole, the ring tube I communicates with an electrolyte output, the annular perimeter of the ring tube I is not equal to the annular perimeter of the ring tube II, and a plurality of liquid holes are formed in tube walls of both of the annular tube I and the annular tube II. By a multi-layer ring tube structure in the storage tank, an electrolyte flowing dead zone of an electrolyte in the storage tank is greatly reduced, the flowing of the electrolyte is more uniform, and the utilization of the electrolyte is effectively improved; and moreover, since the longitudinal distance between the electrolyte output and the electrolyte return hole is reduced, the problem of SOC lag is effectively solved, and the SOC monitoring accuracy of the redox flow battery is improved.
Owner:DALIAN RONGKE POWER
Non-aqueous electrolyte solution for lithium ion battery and lithium ion secondary battery
ActiveCN102569885BAvoid decompositionReduce gas productionSecondary cellsElectrical batteryAqueous electrolyte
The invention provides non-aqueous electrolyte for a lithium ion battery and a lithium ion secondary battery prepared from the non-aqueous electrolyte. The non-aqueous electrolyte for the lithium ion battery comprises cyclic carboxylic ester and / or cyclic carbonate ester, cyclic sulfate, an electrolyte salt, fluoroether with the following structural formula: Rf1-O-Rf2, and a fluorocarbon surfactant, wherein the Rf1 is a fluorine-containing alkyl group of which the carbon atom number is 3 to 4; the Rf2 is a fluorine-containing alkyl group of which the carbon atom number is 2 to 5; the mass percentage of the fluoroether in the electrolyte is 10 to 50 percent; and the fluorocarbon surfactant is used for further improving the performances of the battery. The high temperature performance and the safety of the lithium ion secondary battery prepared from the non-aqueous electrolyte can be kept at a higher level as a whole, and the cycling performance is improved.
Owner:SHENZHEN CAPCHEM TECH CO LTD
Charging control method for battery pack, electronic device, and storage medium
PendingCN114665527ASolve capacity fadingSecondary cells charging/dischargingElectric powerElectrical batteryCharge control
The invention provides a charging control method for a battery pack, and the method comprises the steps: determining a first charging voltage Un of a target battery in the battery pack in the nth charging and discharging cycle, the target battery being a single battery with the highest voltage in the charging process of the nth charging and discharging cycle of the battery pack; determining a second charging voltage UF of the target battery in the nth charge-discharge cycle; in the (n + m) th charging and discharging cycle, the smaller one of the first charging voltage Un and the second charging voltage UF is used as the charging cut-off voltage of each single battery in the battery pack in the charging process, and m is a preset integer larger than or equal to 1. According to the charging control method of the battery pack, the electronic device and the storage medium, the cycle performance of the battery pack can be improved.
Owner:NINGDE AMPEREX TECH
Method for Pretreating Nano Hollow Silicon/Carbon Electrode Materials of Electrochemical Energy Storage Devices with Solvents and Solvent-in-Silicon Particles
ActiveCN111613779BImprove conductivityImprove Coulombic efficiencyMaterial nanotechnologyHybrid capacitor electrodesElectrical batterySolvent
Owner:TSINGHUA UNIV +1
A nitrogen-oxygen double-doped porous hollow bowl-shaped carbon material and its preparation method
ActiveCN110255999BIncrease interplanar spacingStable structureCell electrodesCarbon preparation/purificationPotassium ionsInorganic materials
The invention belongs to the technical field of inorganic material preparation and battery materials, and relates to a carbon-oxygen double-doped porous hollow bowl-shaped carbon material and a preparation method thereof. The material is a carbonaceous bowl-shaped structure particle with high dispersibility and narrow particle size distribution , the particle size is controllable, there is a hollow structure inside the particle, the shape is a concave bowl, the wall thickness is controllable, there are many holes on the wall of the bowl, the holes include micropores and mesopores, and the specific surface area is high; it has nitrogen and oxygen double doping characteristics. Potassium ion battery anode for high volume specific capacity and cycle stability. Potassium-ion batteries are considered to be one of the candidates to replace traditional high-priced lithium-ion batteries due to their abundant global reserves of potassium and low redox voltage values. However, the large size of potassium ions results in a lack of specific capacity for potassium-ion batteries. High electrode material with good cycle stability and rate performance. The material of the invention is used for the electrode of the potassium ion battery, and achieves the purpose of enhancing the stability of the potassium ion battery, improving the rate performance, and simultaneously improving the volume specific capacity of the battery.
Owner:UNIV OF SCI & TECH BEIJING
Novel valve controlled sealing lead acid storage battery activated charge-discharge device and novel valve controlled sealing lead acid storage battery activated charge-discharge method
InactiveCN108183522ARealize multiple charging and discharging processesSolve capacity fadingElectric powerCharge maintainance charging/dischargingMicrocontrollerElectrical battery
A novel valve controlled sealing lead acid storage battery activated charge-discharge device comprises a first storage battery, a second storage battery, a third storage battery and a large battery. The first to third storage batteries are connected with the large battery separately via the conducting wires, a boost circuit and a buck circuit are arranged on the conducting wires and are connectedin parallel, and the first to third storage batteries are connected with the voltage detection modules, a microcontroller and a driving module orderly. The driving module is connected with the boost circuit and the buck circuit and is used to drive the boost circuit and the buck circuit, the large battery is connected with the second voltage detection modules, and the second voltage detection modules are connected with the microcontroller separately. By adding the boost and buck circuits during the charge and discharge process of the storage batteries to realize the repeated charge and discharge operations, the novel valve controlled sealing lead acid storage battery activated charge-discharge device and the novel valve controlled sealing lead acid storage battery activated charge-discharge method provided by the present invention enable the capacity of the batteries to be improved and the service lives to be prolonged.
Owner:STATE GRID ANHUI ELECTRIC POWER CO LTD ANQING POWER SUPPLY CO +2
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