77results about How to "Mitigate capacity fading" patented technology

A battery module with one or more battery cells and a heat exchange member placed in thermal communication with the battery cell, and a method of making a heat pipe system from the heat exchange member. The heat exchange member includes a container with a heat transfer fluid disposed therein. In one form, the heat transfer fluid is capable of going through a phase change as a way to absorb at least a portion of heat present in or generated by battery cell. A pressure control device cooperates with the container and heat transfer fluid such that upon attainment of a predetermined thermal event within the battery cell, the pressure control device permits liberation of at least a portion of the heat transfer fluid to an ambient environment, thereby relieving pressure on the container and removing some of the excess heat caused by the thermal event.

There are cells comprising a sulfur-containing first electrode. The cells also comprise a lithium-containing second electrode associated with a total amount of electrode lithium, including electrochemically utilized electrode lithium. The cells also includes a circuit coupling the first electrode with the second electrode, an article comprising an ionomer and an electrolyte medium comprising at least one additive selected from one or more of the groups consisting of nitrogen-containing additives, sulfur-containing additives, and organic peroxide additives. There are also associated methods of making and methods of using the cells.

The present invention provides a novel method for charging silver-zinc rechargeable batteries and an apparatus for practicing the charging method. The recharging apparatus includes recharging management circuitry; and one or more of a silver-zinc cell, a host device or a charging base that includes the recharging management circuitry. The recharging management circuitry provides means for regulating recharging of the silver-zinc cell, diagnostics for evaluating battery function, and safety measures that prevent damage to the apparatus caused by charging batteries composed of materials that are not suited for the charging method (e.g., non-silver-zinc batteries).

A rechargeable battery includes at least an electrolyte layer, a cathode layer and an anode layer. The electrolyte layer includes a lithium salt compound arranged between a cathode surface of the cathode layer and an anode surface of the anode layer. The anode layer is a nanostructured silicon containing thin film layer including a plurality of columns, wherein the columns are directed in a first direction perpendicular or substantially perpendicular to the anode surface of the silicon thin film layer. The columns are arranged adjacent to each other while separated by grain-like column boundaries running along the first direction. The columns include silicon and have an amorphous structure in which nano-crystalline regions exist.

The invention discloses a gelled electrolyte of a lead-acid storage battery and a preparation method thereof. The electrolyte comprises the following components: sulphuric acid, silicon dioxide, sodium sulfate, polyacrylamide, polyacrylate sodium, sodium molybdate, calcium molybdate, magnesium molybdate, sodium tungstate, potassium sulfate and deionized water; the method comprises the following steps of: adding the sodium sulfate into dilute sulphuric acid to obtain a dilute sulphuric acid mixed solution, then adding the dilute sulphuric acid mixed solution into a sodium silicate solution to obtain a silicon dioxide colloidal suspension, next firstly adding the sodium molybdate, the calcium molybdate, the magnesium molybdate and the sodium tungstate into a vapor-phase silicon dioxide nano-powder suspension to obtain a nano vapor-phase silicon dioxide powder suspension, then preparing a polyacrylamide solution and a polyacrylate sodium solution, then firstly uniformly mixing the silicon dioxide colloidal suspension and the nano vapor-phase silicon dioxide powder suspension, and then adding the polyacrylamide solution and the polyacrylate sodium solution into the mixed suspension to prepare the gelled electrolyte of the lead-acid storage battery. The gelled electrolyte of the lead-acid storage battery can be widely used in a storage battery with the capability of more than 20AH.

The invention, based on an emulsification method and a suspension method, successfully prepare mesophase pitch carbon microsphere with a particle size of 1-5 [mu]m through improving a technology, and the mesophase pitch carbon microsphere is good in dispersibility. The mesophase pitch carbon microsphere is used as a negative electrode material of a lithium battery, and the negative electrode material has an outstanding performance in battery capacity and rate performance, wherein a specific discharge capacity is 271-114.7 mAh / g during 50-40 mA / g. With increasing of charge and discharge current, a capacity decay rate is low and a rate performance is good.

Electrolyte additives are described that enhance cycling stability of electrolytes and lithium composite electrodes that prolong cycling lifetimes and improve electrochemical performance of lithium ion batteries. The electrolyte additives minimize voltage fading and capacity fading observed in these batteries by reducing accumulation of passivation films on the electrode surface.

The invention relates to a lithium ion battery, and belongs to the field of lithium ion battery materials. The lithium ion battery comprises a cathode, an anode and a solid electrolyte thin film whichis coated on the cathode and the anode through a coating method, wherein the solid electrolyte thin film is one or two of polymer electrolyte and inorganic solid electrolyte. The cathode and the anode of the lithium ion battery are coated with the solid electrolyte thin film by adopting a specific-width-and-thickness coating method, so that a uniform solid electrolyte thin film can be obtained; and meanwhile, LiNi1 / 3Co1 / 3Mn1 / 3O2 having a surface coated with Ni1 / 3Co1 / 3Al1 / 3(OH)2 is used as a cathode active substance, so that the discharging specific capacity of the obtained lithium ion batteryis increased, and the capacity attenuation rate is reduced.

The invention provides a lithium manganate material. The lithium manganate material comprises microspheres formed by a plurality of lithium manganate nanoparticles with the particle size of 10-200 nanometers, and a plurality of micropores are formed among the lithium manganate nanoparticles. The lithium manganate material is applied to lithium ion batteries, and the lithium manganate material of the structure is capable of shortening diffusion paths of ions, has large specific surface area to increase the contact area between the same and electrolyte and is capable of easing capacity fading of the lithium ion batteries in the charge-discharge process, so that cycling performance of the lithium ion batteries can be improved. The invention further provides a preparation method of the lithium manganate material.

The invention discloses a method for preparing anode slurry of a lithium ion battery. The method comprises the following steps of: mixing and stirring 50 parts of N-methyl pyrrolidone and 3 parts of polyvinylidene fluoride for 120 minutes, adding 4 parts of conductive agent and stirring for 120 minutes, adding 93 parts of positive electrode materials, adding 50 parts of N-methyl pyrrolidone, stirring for 270 minutes, and filtering the slurry which is completely stirred through a 150-mesh filtering net. By adoption of the technical scheme, the method has the advantages that 1. the positive electrode material is a mixed material of lithium manganate and nickel cobalt lithium manganate; 2. the N-methyl pyrrolidone and 3 percent of polyvinylidene fluoride are mixed to prepare colloid; and 3. 4 percent of conductive agent is added for stirring, 93 percent of positive electrode material is added twice and uniformly mixing. The proportioning formula of the positive electrode material is adjusted, and the homogenizing process is improved, so that the slurry is fully dispersed, and compared with the conventional lithium manganate battery, the prepared lithium manganate battery has the obvious advantages that the capacity attenuation rate is reduced, the cycle lift is prolonged, and the cycle performance of the battery is improved.

Provided herein is a method of reducing the charge / discharge capacity fade rate of a rechargeable lithium-ion battery (LIB) during cycling, and extending the life and the number of discharge / recharge cycles thereof, effected by coating particles of lithium intercalation materials used for making the electrodes of the LIB, with a uniform layer of a metal fluoride effected by atomic layer deposition (ALD). Also provided are coated particulate lithium intercalation materials, electrodes and lithium-ion batteries having electrodes made with particulate lithium intercalation materials coated with a uniform later of a metal fluoride using ALD.

The invention provides a secondary battery based on a graphene aerogel / sulphur composite material. The invention discloses a secondary aluminum which comprises an anode, an aluminum-containing cathode and a non-aqueous electrolyte. The anode is made of the graphene aerogel / sulphur composite material, the cathode is made of metal aluminum or aluminum alloy, and the electrolyte is non-aqueous aluminum-containing electrolyte.

Based on the emulsification method and the suspension method, mesocarbon microbeads, which are successfully prepared by improving technologies with the particle size being 1-5 microns, have good dispersibility. When the asphalt mesocarbon microbeads are used as the lithium battery cathode material, battery storage capacity and rate capacity have prominent performance: with the increase of charge-discharge current, the capacity fading rate is low and the rate capacity is good at 50 mA / G-400mA / g with the specific discharge capacity being 271 mAh / g-114.7 mAh / g.

The invention belongs to the technical field of new energy materials, and particularly relates to an amorphous cobalt phosphide / nanocarbon composite material and a preparation method and application thereof. The composite material is high in specific surface area, rich in pore structure and excellent in conductivity; the conductive carbon network can provide channels for transmission of electronsand ions. The composite material can realize high sulfur loading capacity and high sulfur utilization rate, and can adapt to huge volume change of sulfur in charging and discharging processes. Compared with cobalt phosphide in a high crystalline state, the amorphous cobalt phosphide nanosheet can effectively physically and chemically adsorb polysulfide, reduce the shuttle effect, expose enough catalytic active sites, provide a large number of defect sites, promote electrochemical conversion of polysulfide to the final discharge product and improve the catalytic kinetics of the reaction.

The invention provides a tetrafluoro-borate ion crosslinking hydroxyl polymer binding agent and a preparation method thereof. A polymer with a crosslinking network structure is formed by condensationreaction of tetrafluoro-borate ions formed by hydrolysis of a boride and hydroxyl on a hydroxyl polymer. The binding agent is high in tensile strength and high in elastic modulus and can bear stress generated by volume expansion and shrinkage of a negative active material of a secondary battery, and the volume change is effectively reduced; the active material and conductive additive particles canbe effectively coated by a three-dimensional network structure of the binding agent, favorable contact of the active material and the conductive additive is ensured, and the conductivity of an electrode plate is further ensured; and a hydroxyl group on the binding agent and the active material such as silicon can form a chemical bond, so that the bonding strength of the binding agent and the active material is improved. The invention also provides secondary battery negative paste, a secondary battery negative electrode and the secondary battery which are prepared by employing the tetrafluoro-borate ion crosslinking hydroxyl polymer binding agent.

Electrochemical cells that cycle lithium ions are provided. The electrochemical cells have an electrode that includes a silicon-containing electroactive material that undergoes volumetric expansion and contraction during the cycling of the electrochemical cell; and an electrolyte system that promotes passive formation of a flexible protective layer comprising a lithium fluoride-polymer composite on one or more exposed surface regions of the silicon-containing electroactive material. The electrolyte system includes a lithium salt, at least one cyclic carbonate, and two or more linear carbonates. At least one of the two or more linear carbonate-containing co-solvents is a fluorinated carbonate-containing co-solvent. The electrolyte system accommodates the volumetric expansion and contraction of the silicon-containing electroactive material to promote long term cycling stability.

The invention relates to a novel positive grid lead-calcium alloy for a lead-acid storage battery. The alloy is prepared from components in percentage by weight as follows: 0.05%-0.12% of calcium, 0.5%-1.5% of tin, 0.06%-0.11% of bismuth, 0.07%-0.15% of rare earth elements and the balance of lead, wherein the rare earth elements are one or more of ytterbium, gadolinium and lanthanum. The ingredients of the grid alloy are improved by adding tin, bismuth, the rare earth elements and other additives, and a novel deep-cycle and maintenance-free grid alloy material for the lead-acid storage batterywhich is corrosion-resistant, good in charging property and mechanical property and long in cycle life is obtained.

The invention provides a lithium manganate material. The lithium manganate material comprises microspheres formed by a plurality of lithium manganate nanoparticles with the particle size of 10-200 nanometers, and a plurality of micropores are formed among the lithium manganate nanoparticles. The lithium manganate material is applied to lithium ion batteries, and the lithium manganate material of the structure is capable of shortening diffusion paths of ions, has large specific surface area to increase the contact area between the same and electrolyte and is capable of easing capacity fading of the lithium ion batteries in the charge-discharge process, so that cycling performance of the lithium ion batteries can be improved. The invention further provides a preparation method of the lithium manganate material.

The invention provides a lithium-ion secondary battery with high reversible capacity and a manufacturing method thereof. The battery comprises a pole core, electrolyte and a metal shell, wherein the pole core and the electrolyte are accommodated in the metal shell; the pole core comprises a positive plate, a negative plate and a diaphragm positioned between the positive plate and the negative plate; the positive plate comprises a positive current collector and positive slurry coated on the positive current collector, and the negative plate comprises a negative current collector and negative slurry coated on the negative current collector; the battery also comprises a composite lithium plate, wherein the composite lithium plate is arranged in the metal shell; and the composite lithium plate comprises a metal matrix layer and a lithium coverage layer, the metal matrix layer is not dissolved in the electrolyte and does not undergo electrochemical reaction with the electrolyte, and the metal matrix layer is welded on the inner surface of the positive current collector or the negative current collector or the metal shell. Lithium ions consumed for forming a solid electrolyte interface (SEI) film can be effectively supplemented, and the utilization rate of lithium materials can be improved. The reversible capacity of the lithium ion battery can be improved, the irreversible capacity of the battery can be reduced, and the high reversible capacity of the battery can be kept.

The invention firstly provides a quasicrystal complex phase hydrogen storage alloy containing magnesium, titanium, vanadium and nickel and a preparation method thereof, belonging to the field of hydrogen storage materials. The expression formula of the hydrogen storage alloy is Ti1.4V0.6Ni+x% by weight of Mg, wherein x is more than 1 and less than 5. The invention further provides the preparation method of the quasicrystal complex phase hydrogen storage alloy containing the magnesium, the titanium, the vanadium and the nickel, and the method comprises the following steps: placing Ti, V and Ni metals into a vacuum electric arc furnace to smelt so as to form an alloy ingot, and preparing a Ti1.4V0.6Ni quasicrystal complex phase material thin strip containing an I phase through a vacuum sharp quenching and casting integrated machine; and then grinding, and placing magnesium powder into a ball milling tank for ball milling so as to get the hydrogen storage alloy, wherein the weight ratio of balls to material is (20-10): 1, and the ball milling time is 10-30min. Experimental results show that, after 50 cycles, the capacity decay rate of the quasicrystal complex phase hydrogen storage alloy containing the magnesium, the titanium, the vanadium and the nickel is far lower than the quasicrystal complex phase hydrogen storage alloy containing the titanium, the vanadium and the nickel.

The invention relates to a method for modifying a polyolefin lithium-ion battery separator, belonging to the field of lithium-ion battery separators. The method comprises the steps of: the step 1) immersing a pretreated polyolefin separator into a polycation electrolyte solution containing a calcium salt for 10-100 min, taking out and cleaning the pretreated polyolefin separator, then immersing the pretreated polyolefin separator into a polyanion electrolyte solution containing sodium silicate for 10-100 min, so that Ca2+ in the calcium salt and SiO32- ions of the sodium silicate react in situwhile the polycation electrolyte and the polyanion electrolyte are assembled according to electrostatic action to generate calcium silicate inorganic nano particles in the polyelectrolyte; repeatingthe steps for 1-6 times, and constructing organic / inorganic hybrid composite layers with different assembly layer numbers on the surface of the polyolefin porous separator; and then drying the organic / inorganic hybrid composite layers to finish the steps. The separator has better thermal stability and charge-discharge stability.

The invention provides a battery management device and a portable computer. The battery management device is used for managing a rechargeable battery arranged in the portable computer; the portable computer is provided with a charging circuit used for charging the battery; the battery management device comprises a discharging circuit used for discharging the battery, an acquisition module used for acquiring mode judging parameters, a first judging module used for judging whether the device is to be in a battery storage mode according to the mode judging parameters, and a first control module used for controlling the charging circuit or the discharging circuit to control the electric quantity of the battery in the battery storage mode so as to enable the electric quantity of the battery to be lower than a second electric quantity threshold; and the performance of the battery stored when the electric quantity is lower than the second electric quantity threshold is superior to that of the battery stored when the electric quantity is higher than the second electric quantity threshold. The battery management device postpones the capacity attenuation of the rechargeable battery of the portable computer.

The invention relates to a preparation method of a yolk-shell structure molybdenum disulfide@ carbon electrode material. The preparation method includes: utilizing molybdenum disulfide precursor solvothermal ethylene glycol to obtain monodisperse molybdenum disulfide nanospheres; allowing dopamine to self-polymerize on the interfaces of molybdenum disulfide particles to obtain a molybdenum disulfide@ polydopamine core-shell structure, and performing high-temperature carbonization on molybdenum disulfide@ polydopamine to obtain core-shell structure molybdenum disulfide@ carbon nanoparticles; dispersing molybdenum disulfide@ carbon in a hydrogen peroxide solution for hydrogen peroxide etching to obtain the yolk-shell structure molybdenum disulfide@ carbon material. A gap between molybdenum disulfide and a carbon shell can be well regulated by adjusting concentration of hydrogen peroxide. When the concentration of hydrogen peroxide is 0.4vol%, discharging specific capacity of a prepared yolk-shell structure molybdenum disulfide@ carbon lithium ion battery cathode in the second circle is up to 1167mAh g-1, discharging specific capacity after being circulated for 200 circles is 880mAh g-1, capacity retaining rate is 75.4%, and rate performance is outstanding.

The invention relates to a trimethoxysilane-terminated polymer adhesive, a preparation method and application thereof. The preparation method comprises the following steps: firstly mixing polyurethanesolution and a silane coupling agent, and reacting for 5-8 hours at the temperature of 60-80 DEG C, thus obtaining the trimethoxysilane-terminated polymer adhesive after the reaction is ended; or firstly mixing polyimide solution and the silane coupling agent, and reacting for 5-8 hours, thus obtaining the trimethoxysilane-terminated polymer adhesive. The trimethoxysilane-terminated polymer adhesive, the preparation method and the application have the beneficial effects that a series of adhesives are prepared by crosslinking reaction of the silane coupling agent and polymer, and organic components and inorganic components are combined together to obtain a novel organic-inorganic hybrid polymer adhesive; by combination of the advantages of the mechanical properties of the organic matters and the inorganic matters, the mechanical property is excellent, and stress generated by volume expansion of active materials such as silicon can be effectively borne; when the trimethoxysilane-terminated polymer adhesive is applied in secondary batteries, bonding force between the active material and the adhesive is improved, the integrity of an electrode structure can be effectively maintained, and the cycling stability and the rate performance of an electrode are improved.

The invention provides a high-specific-capacity metal organic negative electrode material of a secondary ion battery. A preparation method of the metal organic negative electrode material comprises the following steps: (1) mixing carboxylic acid containing a benzene ring, LiOH.H2O and metal salt according to the mol ratio of (0.8-1.2) to (0.5-1) to (0.25-1); then dissolving the mixture into absolute ethyl alcohol and ultrasonically stirring for 1h to 1.5h; (2) sealing a reaction solution obtained by the step (1) at 110 DEG C to 120 DEG C and reacting for 12h to 14h; and (3) washing a reactant obtained by the step (2) with de-ionized water and the absolute ethyl alcohol for 3-4 times respectively, centrifuging, drying an obtained solid at 70 DEG C to 80 DEG C for 6h to 8h and milling to obtain the product. By adopting organic salt formed by synthesizing metal salt and organic matters, organic energy storage and inorganic energy storage can be combined together, so that the prepared negative electrode material has a high specific capacity, high coulomb efficiency and excellent electrochemical circulating performance.

The invention discloses a preparation method of lithium iron borate. The preparation method comprises the following steps: mixing a lithium borohydride solution with a ferric nitrate solution and pouring a mixed solution into a sealed high-pressure reactor, carrying out hydrothermal reaction and then decompressing; absorbing the exported gas with ferric hydroxide slurry, adding aluminum citrate, uniformly stirring and mixing and then carrying out spray drying to obtain a dry material; sintering the dry material in an inert atmosphere, cooling to a temperature below 60 DEG C and discharging toobtain a calcined material; carrying out fluid energy milling on the obtained calcined material by using nitrogen, screening, removing iron and carrying out vacuum packaging to obtain a cathode material of the lithium iron borate. According to the preparation method of the lithium iron borate, disclosed by the invention, amorphous lithium iron borate is prepared by using the hydrothermal method, is coated with alumina citrate and is then calcined at high temperature to obtain the lithium iron borate coated with alumina and carbon; the lithium iron borate has the advantages of small primary particle size, good stability and good electrochemical property.