104results about How to "Small capacity attenuation" patented technology

The invention relates to a method for preparing a lithium ion battery anode material doped with a nanometer oxide, belonging to the technical field of manufacturing processes of lithium ion battery batteries. The method is characterized in that trace amount of nanometer oxide power is doped in the preparation process of lithium manganate, lithium cobaltoxide and lithium iron phosphate; the doping amount is 0.5-1.0 mol percent of lithium salts; and the nanometer oxide is selected from one or two of alumina, magnesia, titanium oxide, chromic oxide, nickel oxide, monox and zirconia and the nanometer oxide is subject to ball milling, drying, sieving, calcinating, crushing, grading and other processes to obtain the nanometer oxide doped or coated lithium ion battery anode material. The lithium ion battery anode material has reversible initial capacitance, and remarkably-improved attenuation property, charging-discharging properties, high-temperature circulating property and electrochemistry stability.

An object of the present invention resides in that under the use of an active material capable of attaining a high capacity, the volume expansion of the negative electrode is alleviated, the maintenance of the structure of the negative electrode is achieved, and the degradation of the battery capacity is suppressed. The present invention relates to a negative electrode for a coin-shaped lithium secondary battery, a coin-shaped lithium secondary battery including the negative electrode, and a method for producing the negative electrode for a coin-shaped lithium secondary battery, wherein: the negative electrode includes a molded negative electrode including a negative electrode active material capable of absorbing and desorbing lithium; the molded negative electrode is of a coin shape having two flat faces and a side edge, and has cracks along the thickness direction thereof; at least one of the two flat faces has recessed portions; and the cracks start from the recessed portions.

The invention relates to a preparation method of a carbon fiber / sulfur composite positive material with a multilevel structure and belongs to the technical field of chemical engineering electrode material preparation processes. The preparation method comprises the steps of preparing a carbon fiber by an electrostatic spinning method, adding metal salt into a spinning solution, calcining in an inert atmosphere, catalyzing graphitization of the carbon fiber by virtue of a metal formed in situ on one hand, removing metal particles to form hollow carbon spheres by virtue of the metal formed in situ on the other hand, and then adsorbing sulfur into the graphitized hollow carbon spheres by virtue of a gas-phase thermal evaporation method. With the adoption of the carbon fiber / sulfur composite positive material with the multilevel structure, the rate capability of the material is greatly improved, the dissolution of polysulfide is also inhibited, and the cycle performance and the coulombic efficiency of the material are improved. The preparation method is simple and easy, is high in controllability of technological parameters and low in energy consumption and has a low equipment requirement.

The invention belongs to the field of a lithium ion battery anode material and a preparation method thereof and application of a CNF-TMO lithium ion battery anode material. The method comprises the steps of: dissolving transition metal salt in an organic solvent, and adding polymer powder to fully dissolve and uniformly mix the transition metal salt and the polymer powder to obtain a spinning solution; performing spinning under the action of a high-voltage electrostatic field by setting spinning parameters to obtain a polymer-transition metal salt non-woven fabric; soaking the polymer-transition metal salt non-woven fabric in methanol solution of organic ligand to form one layer of organic metal frame material on the surface of the polymer fiber homogeneously under the action of the strongcoordination between the transition metal ion and the organic ligand to obtain a polymer-transition metal salt-organic metal frame material; then putting the polymer-transition metal salt-organic metal frame material into a tubular furnace, performing carbonizing of the polymer-transition metal salt-organic metal frame material at a high temperature under the flow of hydrogen / argon mixed gas to obtain carbon nano fiber-transition metal, thermally oxidizing the carbon nano fiber-transition metal in air, grinding and crushing the carbon nano fiber-transition metal to obtain a CNF-TMO lithium ion battery anode material.

The invention belongs to the production field of lithium batteries, in particular to a lithium ion battery separator with low thermal shrinkage rate and a preparation method therefor. The surface of the lithium ion battery separator with the low thermal shrinkage rate is uniformly coated with a cellulose layer; and a porous membrane base material is any one of a PE single-layer membrane, a PP single-layer membrane or a PP / PF / PP three-layer co-extruding membrane. The preparation method provided by the invention is as follows: cellulose dissolving, mixing the cellulose, strong alkali, urea and water at a proper proportion to obtain a cellulose carbamate solution; cellulose coating, coating the solution on the surface of the porous membrane base material and drying; and cellulose regenerating, immersing the porous membrane base material which is coated with the cellulose into a sulfuric acid solution at a certain concentration to regenerate, and drying. The lithium ion battery separator and the preparation method therefor have the beneficial effects that: the coating layer is in tight contact with the porous membrane base material without falling easily; the thermal shrinkage rate of the diaphragm is greatly reduced; the lithium ion battery separator is higher in electrolyte wettability; the capacity fading of the battery can be effectively reduced; and the cellulose of waste batteries can be dissolved and reused, so that the lithium ion battery separator is energy-saving and environment-friendly.

The invention discloses a method for eliminating impurity influence of an all-vanadium redox flow battery electrolyte. The method comprises the steps of adding a complexing agent into the electrolyte, and fully stirring the electrolyte, wherein the complexing agent is phosphoric acid, inorganic phosphate, hydramine, amino carboxylate, hydroxy carboxylate or organic phosphate. By the method, the steps of impurity elimination during the preparation process of the electrolyte is omitted or reduced, the operation process is simple, the product is rich in raw material, complicated impurity elimination equipment is not needed to be matched, the impurity elimination cost is low, and the method is suitable for application on a large scale; by a mode of adding the complexing agent, impurity metal ions form a complexity body, a reaction electrical pair shifts out of a reaction potential section of an active substance of the all-vanadium redox flow battery electrolyte, the hydrogen evolution promotion effect of the metal ions is eliminated, the hydrogen evolution quantity of the redox flow battery is reduced, the capacity attenuation is reduced, and the lifetime of the redox flow battery is prolonged; and impurity ions introduced during the construction, running and maintenance process of the redox flow battery can be rapidly eliminated, and the method is simple and convenient and is suitable for promotion and application.

Characters of the invention are as followings: assembled battery includes positive plate composed of compounds Ni(OH)2 and Co(II), and metal Co; in room temperature, or higher than room temperature, batteries are laid aside; next, precharging battery by using current density less than and equal to 20mA / cm2 based on area of positive plate as reference; then, batteries are laid aside in late stage in room temperature, or higher; afterwards, carrying out constant current charge for second time, and then discharging; carrying out constant current charge for second cycle, which includes two segments of constant current charge; finally, carrying out constant current charge for third cycle identical to the said second cycle. The invention raises consistency of quantity of converting cobalt, reduces AC internal resistance and DC internal resistance of battery, delays lowering OCV speed from 15%-20% to 5% of capacity attenuation when battery is laid aside at discharging state.

The invention discloses a multipoint temperature control protective method of a lithium-ion power battery. Multiple thermistors which are used for detecting the temperatures of measuring points are mounted on a lithium-ion power battery, and the thermistors are connected with a fixed resistor. The protective method comprises the following steps: acquiring values of the thermistors at the current measuring points; obtaining temperature values of various measuring points according to the values of the thermistors; comparing the temperature values of the various measuring points, and taking corresponding measures according to a compared result. The invention also relates to a device for realizing the protective method. The multipoint temperature control protective method and device of the lithium-ion power battery have the beneficial effects that the battery can be protected in time, the service life of the battery can be prolonged, the capacity fading of the battery can be slowed down, and the actual temperature of the battery can be reflected in time.

The invention discloses a method for growing a protective layer on the surface of a metal negative electrode of a secondary lithium battery, Dimethyl carbonate is chosen as base liquid, salt compoundof transition metal is chosen as treating agent, imidazole reagent is chosen as solvent, base liquid is mixed, and the treating agent which accounts for 0.1-15% of base liquid and the solvent which accounts for 10-65% of base liquid are mixed to prepare protective liquid. B, that metal negative electrode is place in the protective liquid for standing, vibration, shake or agitation treatment, and the treatment temperature is -20 to 120 DEG C and the time is 5 to 5 hour. A layer of protective layer can be formed on that surface of a lithium metal or a lithium alloy negative electrode effectively, the growth of lithium dendrite on the surface can be inhibited, and the safety performance and the cycle performance of the battery can be improved.

The invention belongs to the technical field of a sodium ion battery, and particularly relates to a negative electrode material phosphorus-sulfur double-doped hard carbon microsphere for a sodium ion battery and a preparation method of the negative electrode material. The negative electrode material for the sodium ion battery is a sucrose-based hard carbon material doped with elements sulfur and phosphorus and is an irregularly-shaped microsphere body, and the diameter of the microsphere is 3-10 micrometers. The material is prepared by hydrothermal reaction and high-temperature solid-phase reaction, metal sodium is used as a counter electrode, and in the sodium ion battery packaged from the material, the reversible capacitor of the sodium ion battery is about 340mAh / g under the current density being 30mA / g, and the specific capacity still can be maintained at (170-340)mAh / g after 3,500 circles and under a large current being 600mA / g. The electrode material has the advantages of high specific capacity, good rate performance, simple preparation method and low cost in raw material, and is applicable to a power type sodium ion battery.

The invention provides a positive active material with a phosphate coated spinel structure. The positive active material contains lithium-containing compound particles which have the spinel structure and the chemical formula LiMn(2-x)AxOy and a phosphate coating layer coating the surfaces of lithium-containing compound particles, in the chemical formula LiMn(2-x)AxOy, A is selected from one or more of Ni, Fe, Co, Ti, Y, Sc, Ru, Cu, Mo, Ge, W, Zr, Ca and Sr, x is larger than or equal to 0 and smaller than or equal to 0.7, and y is larger than or equal to 3.8 and smaller than or equal to 4.2; the lithium-containing compound particles have transition layers, and the transition layers contain dispersion elements which are diffused to enter the lithium-containing compound particles through coating and optional calcination. The invention also provides a preparation method of the positive active material and an application of the positive active material in a lithium ion secondary battery. The positive active material has improved circulation stability and coulombic efficiency when used in the lithium ion secondary battery.

The invention discloses a self support high density metal oxide / nitrogen doped graphene composite electrode, and a preparation method and application thereof. The composite electrode is prepared by the following steps of firstly obtaining nitrogen doped graphene through water bath reaction; then, dispersing the nitrogen doped graphene into an organic solvent; dripping the organic solvent dissolvedwith metal salt; performing uniform dispersion; then performing hydrothermal reaction; preparing a powdery metal oxide / nitrogen doped graphene composite material; then, adding a small amount of graphene oxide so that the powdery metal oxide / nitrogen doped graphene composite material is uniformly dispersed into graphene oxide; preparing metal oxide / nitrogen doped graphene water gel through secondary hydrothermal reaction; finally performing slicing and natural shrinkage drying. The composite material has a self support structure; the density is greater than 1.0g / cm<3>; through a two-step hydrothermal method, an obtained electrode plate can be directly used as an electrode of a lithium ion battery or a sodium ion battery; the electric chemical performance of high volume capacity, high reversibility and high power performance is realized.

The invention belongs to the field of lithium ion batteries, and discloses a CNF-metal compound independent electrode material and preparation method and application thereof. The preparation method comprises the steps of dissolving a metal salt in dimethylformamide, adding polyacrylonitrile powder again, and performing uniform mixing to obtain a mixed spinning liquid; spinning under a high-voltageelectrostatic field to obtain polyacrylonitrile-metal salt composite non-woven fabric; immersing the polyacrylonitrile-metal salt composite non-woven fabric in a methanol solution of an organic ligand, uniformly forming a layer of organic metal framework material on a polyacrylonitrile fiber surface by a strong coordination effect of dissolved-out metal ions and the organic ligand so as to obtaina polyacrylonitrile-metal salt@organic metal framework; and placing the polyacrylonitrile-metal salt@organic metal framework in a tubular furnace, allowing the polyacrylonitrile to be pre-oxidized under 280 DEG C, performing high-temperature carbonization under a mixed atmosphere of hydrogen and argon, and finally, performing oxidization, vulcanization or selenylation to obtain the sheet-shaped CNF-metal compound independent electrode material. The CNF-metal compound independent electrode material is cut into an electrode plate and is directly used as a negative electrode in a lithium ion battery.

The invention discloses an organic phase electrolyte and an application thereof in a negative electrode of a redox flow battery. The organic phase electrolyte consists of active materials, a supporting electrolyte and an organic solvent, wherein the active materials are diphenyl ketone and a derivative thereof, anthrone and a derivative thereof, or dibenzoyl methane and a derivative thereof; the supporting electrolyte is selected from tetraethylammonium hexafluorophosphate, tetraethylammonium tetrafluoroborate, tetrabutylammonium hexafluorophosphate or tetrabutylammonium tetrafluoroborate; and the organic solvent is selected from acetonitrile, tetrahydrofuran, propylene carbonate, ethylene carbonate, dimethyl sulfoxide, dimethylformamide, glycol dimethyl ether or ethylene glycol diethyl ether. The organic phase electrolyte disclosed by the invention has relatively low electrochemical potential and high electrochemical property; when the organic phase electrolyte is used as the negative electrode electrolyte of the redox flow battery for assembling an organic phase redox flow battery, relatively high open-circuit voltage can be realized, so that the energy density of the battery can be improved; and meanwhile, the capacity fading of the battery can be lowered, so that the cycle life of the battery can be prolonged.

Disclosed is a super capacitance battery. An anode comprises an anode current collector and an anode material coated on the anode current collector, the anode material comprises an anode active material, a first binder and a first conductive agent, the anode active material is composed of a carbon material and a lithium ion material, the content of the carbon material in the anode active material is larger than or equal to 70% and smaller than 100%, a cathode comprises a cathode current collector and a cathode material coated on the cathode current collector, the cathode material comprises a cathode active material, a second binder and a second conductive agent, the cathode active material is composed of a silicon mixture and graphene according to the mass ratio of 1-20:80-99, and the silicon mixture is composed of monatomic silicon and silicon dioxide according to the mass ratio of 1:19-19:1. The cathode of the super capacitance battery is provided with a low potential platform, so that average working voltage of the super capacitance battery is increased, and the super capacitance battery has high-ratio power characteristics and high-ratio energy characteristics. In addition, the invention further provides a preparation method for the super capacitance battery.

The invention discloses a method for repairing oxygen defect in a preparation process of spinel lithium manganate as a lithium-ion cathode material. The method comprises the following steps: (1) taking lithium carbonate and electrolytic manganese dioxide as main reaction substances and doping with aluminium hydroxide; (2) weighing reactants in proportion and putting the reactants in a horizontal-type ball mill tank for coarsely mixing; (3) putting the coarsely mixed materials into an automatic granulator for finely mixing and directly granulating the materials in the granulator after finely mixing; (4) putting the granulated materials in a drying oven for drying and putting the dried granulated materials into an atmosphere furnace for calcining for the first time; and (5) smashing the calcined materials, supplementing the lithium and carrying out secondary calcining. With the adoption of the method, the material performance is improved; and the preparation process is simple and easy in operation; the raw materials are easily available; and the obtained product is uniform.

The invention belongs to the technical field of supercapacitor electrode materials, and discloses a nickel sulfide nanosheet / carbon quantum dot composite material and a preparation method and application thereof. The composite material is prepared by the following steps: ultrasonically dispersing carbon quantum dots in an aqueous solution; adding soluble nickel salt and hexamethylenetetramine to obtain a carbon quantum dot / nickel hydroxide mixture precursor solution, enabling the precursor solution to grow on the surface of the foamed nickel at the temperature of 90-120 DEG C, mixing the carbon quantum dot / nickel hydroxide mixture with the sodium sulfide solution, performing hydrothermal reaction at the temperature of 100-140 DEG C, washing with water, and drying to obtain the composite material. The preparation method has the characteristics of simple preparation process, stable process, easiness in operation, low cost, no pollution and the like. The nickel sulfide nanosheet / carbon quantum dot composite material has a unique honeycomb nanosheet structure, which is beneficial to effective infiltration of an electrolyte, can enable the electrolyte to be in full contact with active substances, improves the electrochemical performance of the material, and can be used as a supercapacitor electrode material.

The invention provides a double crosslinking binder for a silicon-based negative electrode material for a lithium battery, a silicon-based negative electrode material for the lithium battery, a preparation method, a negative electrode of the battery and the lithium battery. The double crosslinking binder comprises polyacrylic acid and diisocyanate. According to the double crosslinking binder, polycondensation reaction of the diisocyanate and carboxyl of the polyacrylic acid is achieved under a room-temperature condition through adding the diisocyanate, and the double crosslinking binder playsa further stabilizing role on a polymer binder, formed by the polyacrylic acid, with a network structure, thereby achieving double crosslinking; the double crosslinking binder is extremely low in consumed energy; and meanwhile, the adverse effect, caused by repeated volume change, of the silicon negative electrode in charging and discharging processes of the battery is avoided, the cycle performance of the silicon-based negative electrode material is improved, the capacity attenuation of the battery is small and the defects of the prior art are overcome.

The invention discloses a preparation method of a lithium-rich manganese-base anode material. A chemical general formula of the lithium-rich manganese-base anode material is xLi2MnO3<-(1-x)> Limo2, wherein x is larger than or equal to 0 and smaller than or equal to 1, and M adopts transition metal elements of Ni, Co and Mn. The preparation method of the lithium-rich manganese-base anode material comprises the steps as follows: (1), a transition metal salt solution is prepared; (2), a precipitant solution is prepared; (3), the metal salt solution is subjected to ultrasonic atomization and then sprayed into the precipitant solution, and stirring is performed while spraying is performed; (4), the stirring is stopped, still standing is performed, and a precipitated product after reaction is washed to obtain a transition metal precursor; (5), the transition metal precursor and Li salt are mixed, subjected to ball milling in a dispersing agent and dried to obtain a precursor; and (6), the precursor is sintered at the high temperature and cooled to obtain the lithium-rich manganese-base anode material product. According to the invention, the transition metal precursor with higher chemical homogeneity and smaller particle size is prepared in a spraying manner, and the lithium-rich manganese-base anode material with higher electrochemistry capacity, lower capacity fading and better rate capability is obtained after sintering.

The invention provides a positive electrode material with an improved nanoscale structure for a lithium-ion battery. The positive electrode material comprises two kinds of particles which are alternately arranged in structure, wherein the particles comprise layered positive active materials and spinel positive active materials; the layered positive active materials and the spinel positive active materials are alternately arranged to form the particles; the layered positive active materials comprise xLi<2>MO<3>.(1-x)LiMO<2>, wherein x is smaller than 1 and greater than or equal to 0; the spinel positive active material comprise LiM<2>O<4>; and M is one or more of metallic elements of which the atomic numbers are greater than 6. The invention further provides a preparation method of the positive electrode material with the improved nanoscale structure for the lithium-ion battery.

The invention relates to the technical field of sodium ion batteries, and particularly discloses a vanadium pentoxide positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a vanadium source and a sulfur source into an alcohol solvent, and reacting to obtain a sea urchin-shaped VS4 precursor; sintering the VS4 precursor to obtain V2O5 powder with a multi-dimensional mixed structure; dispersing the V2O5 powder and polypyrrole in ethanol, adding a block copolymer surfactant to obtain a suspension, performing electrostatic spinning to obtain V2O5 / polypyrrole fibers, and calcining the obtained fibers in an inert atmosphere to obtain the vanadium pentoxide positive electrode material. The vanadium pentoxide positive electrode material provided by the invention is of a fiber net structure, the active material V2O5 powder simultaneously contains double morphologies of a two-dimensional structure and a three-dimensional structure, the surface of the active material V2O5 powder is coated with polypyrrole, and the vanadium pentoxide positive electrode material is high in ion transmission efficiency, good in conductivity and stability, higher in specific capacity, less in capacity attenuation and good in cycle performance.

Nanoporous metal oxide framework compositions useful as anodic materials in a lithium ion battery, the composition comprising metal oxide nanocrystals interconnected in a nanoporous framework and having interconnected channels, wherein the metal in said metal oxide comprises titanium and at least one metal selected from niobium and tantalum, e.g., TiNb2-x TaxOy (wherein x is a value from 0 to 2, and y is a value from 7 to 10) and Ti2Nb10-vTavOw (wherein v is a value from 0 to 2, and w is a value from 27 to 29). A novel sol gel method is also described in which sol gel reactive precursors are combined with a templating agent under sol gel reaction conditions to produce a hybrid precursor, and the precursor calcined to form the anodic composition. The invention is also directed to lithium ion batteries in which the nanoporous framework material is incorporated in an anode of the battery.

The invention provides a high temperature-resistant electrolyte solution of a lithium ion battery. The high temperature-resistant electrolyte solution of the lithium ion battery comprises the raw materials of lithium electrolyte salt, an organic solvent, a high temperature-resistant additive, a film forming additive and a circulatory stability additive, wherein the concentration of the lithium electrolyte salt in the organic solvent is 0.5-2 mol / L; the organic solvent comprises the following components in parts by volume: 5-30 parts of a high-dielectric-constant organic base solvent, 40-65 parts of a high-boiling-point organic solvent, and 5-55 parts of a low-viscosity organic solvent; the high temperature-resistant additive is at least one of lithium tetrafluoroborate, lithium difluoroborate, lithium bis(malonato)borate, lithium bis(oxalate)borate and lithium malonato oxalate borate, the mass of the high temperature-resistant additive accounts for 0.1-8% of the total mass of the electrolyte solution, the mass of the film forming additive accounts for 0.2-4% of the total mass of the electrolyte solution, and the mass of the circulatory stability additive accounts for 0.5-5% of the total mass of the electrolyte solution. According to the invention, the high temperature resistance and circulatory stability of the lithium ion battery are effectively improved.

The invention relates to a composite positive electrode material based on 3D graphene and a preparation method thereof. The composite positive electrode material contains three-dimensional graphene and nano metal nickel, wherein the nano nickel particles uniformly disperse in the channels of three-dimensional graphene, the three-dimensional comprises a plurality of graphene molecules interconnected through a plurality of small organic molecules, and the nano nickel particles are introduced into the channels of the three-dimensional graphene by an in-situ reduction reaction. The composite positive electrode material provided by the invention has good electronic conductivity, is conducive to the effective electron transfer between the electrode and the collector, realizes high utilization of active materials, and is beneficial to improve the specific capacity and cycle stability of the battery. In addition, the preparation process is simple, environmental-friendly and low-cost, and the material has controllable morphology.

The invention relates to the technical field of lithium ion battery negative electrode material preparation, in particular to a preparation method of a lithium battery negative electrode multilayer hollow tin oxide material. Expandable graphite is subjected to microwave and ultrasonic treatment into a graphite nanosheet layer; the graphite nanosheet layer can trigger rubber cross-linking reactionin the copolymerization process of acrylonitrile and butadiene; the graphite nanosheet layer reaches nano-dispersion in a rubber substrate; meanwhile, certain intercalated structures exist; a conductive network is formed, so that the conductivity of the lithium battery negative electrode material is improved; nanometer conductive rubber powder is blended into tin oxide suspension; the multilayer hollow tin oxide material is formed; after the tin oxide material expansion, the crystal material abrasion can be reduced through slippage; carbonized tin and titanium at the tin oxide material surfacecan reduce the volume expansion of stannic oxide; the capacity fading caused by volume expansion of stannic oxide is reduced; wide application prospects are realized.

The invention relates to a graphene-based lithium iron phosphate positive electrode plate and a preparation method thereof. The positive electrode plate uses carbon-coated lithium iron phosphate as apositive electrode active material, thin graphene as a conductive agent and polyvinylidene fluoride as a binder, with the composition ratio of lithium iron phosphate (LiFePO4): graphene: polyvinylidene fluoride being (92-96): (2-4): (2-4). The preparation method includes the following steps: lithium iron phosphate and polyvinylidene fluoride powder are milled for 1-3h and dry-mixed; graphene conductive slurry is added to N-methyl-pyrrolidone organic solvent and ultrasonic stirring is carried out for 0.5-1h; and the dry-mixed powder is added to the graphene N-methyl-pyrrolidone solvent, the slurry is first dispersed at high speed by a wet grinding machine for 2-4h and then dispersed in a high-pressure homogenizer for 1-2h to obtain positive electrode slurry. By adopting the slurry preparedin the invention, the dispersion degree of the slurry can be significantly improved. A graphene-based lithium iron phosphate battery prepared in the invention has excellent cyclic discharge rate performance. The specific discharge capacity at 20C is 105-115mAh / g, and the capacity retention rate is 75-85%.

The invention discloses a method for improving the stability of an anode material of a lithium ion battery, comprising the following steps of: 1) in a reaction kettle, dispersing the anode material of the lithium ion battery into water to enable the mass content of a solid material to be 20-70%; sufficiently agitating to keep a suspension solution uniform; 2) utilizing a metering pump to inject a Ce<3+>-containing solution and a PO4<3->-containing solution into the suspension solution in a mol ratio that Ce<3+> to PO4<3-> is 1: 1; sufficiently reacting; 3) filtering and washing the solid material; 4) drying the obtained solid material at 90-150 DEG C; 5) carrying out heat treatment on the dried solid material at 500-800 DEG C for 2-8 hours; and 6) crushing and sieving a product which is subjected to the heat treatment to obtain a product. According to the method disclosed by the invention, the thermal stability and the circulating stability of the material can be improved.

The invention provides an aqueous electrolyte, an aqueous metal ion battery and a preparation method thereof. The invention relates to the technical field of ion batteries, and provides an aqueous electrolyte with water as a solvent, water-soluble metal salt as a solute and one or more of C1-C10 alcohols, C1-C10 acids, pyridine and methanesulfonic acid as additives, and the mass fraction of the additives is 0.001%-10%. The aqueous electrolyte disclosed by the invention has flame-retardant and explosion-proof functions; safety accidents such as deflagration caused by thermal runaway of the battery in the overcharge and overdischarge process can be effectively inhibited; dendrite generated by the negative electrode in a metal electrodeposition reaction can be effectively inhibited, the uniformity of the electrodeposition reaction of the negative electrode is improved, capacity attenuation and battery failure caused by micro short circuit of the positive electrode and the negative electrode are reduced, and the cycling stability and the service life of the battery are remarkably improved.

The invention relates to the technical field of lithium ion batteries, and especially relates to a secondary lithium ion battery, and a method used for improving the electric capacity of the secondary lithium ion battery. The method provided by the invention comprises steps that: an air sac is produced form a polypropylene film, and sufficient electrolyte is filled in the air sac; an inverted U-shaped port of the air sac is extended into a liquid filling hole, and the inverted U-shaped port and the liquid filling hole form a sealed connection; when the secondary lithium ion battery is formed, a liquid filling space in the battery generates gas which is discharged upwards into the air sac; the electrolyte in the air sac flows into the liquid filling space in the battery for supplementing electrolyte consumed by battery formation. With the method provided by the invention, under a condition that a battery housing and a battery core are not changed, the electric capacity is optimized, the capacity attenuation is slow, the circulation performance is good, and the service life is long. With the method, efficiency can be improved, cost can be reduced, and product qualification rate can be ensured.

The invention belongs to the technical field of supercapacitor electrode materials, and discloses a nickel-cobalt hydroxide / molybdenum trioxide core-shell nanorod array material and a preparation method and application thereof. The core-shell nano material is prepared by the following steps: dissolving ammonium molybdate into deionized water; adding acid-treated carbon cloth, performing reacting in a hydrothermal reaction kettle to prepare a carbon cloth loaded molybdenum trioxide nanorod array precursor, inserting the precursor material as a working electrode into mixed solution containing soluble nickel-cobalt salt, selecting a potential step mode reaction by using an electrochemical workstation, and performing water washing and drying to obtain the material. The preparation method has the characteristics of simple preparation process, stable process, operation easiness, low cost, no pollution and the like. The nickel-cobalt hydroxide / molybdenum trioxide core-shell nanorod array material has a unique one-dimensional array structure, thereby facilitating the effective infiltration of an electrolyte. Meanwhile, the electrolyte can be in full contact with an active substance, so that the electrochemical performance of the material is improved, and the material can be used as a supercapacitor electrode material.