103results about How to "High cycle capacity" patented technology

A lithium ion electrochemical cell having high charge/discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one nitrate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture that includes ethylene carbonate, dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. The preferred additive is an organic alkyl nitrate compound.

A lithium ion electrochemical cell having high charge/discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one nitrite additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture that includes ethylene carbonate, dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. The preferred additive is an alkyl nitrite compound.

A lithium ion electrochemical cell having high charge/discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one dicarbonate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture that includes ethylene carbonate, dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. The preferred additive is an alkyl dicarbonate compound.

The invention provides a lithium ion battery gel polymer electrolyte and a preparation method thereof. The lithium ion battery electrolyte is composed of a macromolecular polymer, an ionic liquid, an organic solvent, a lithium salt and a film-forming additive. Through preparation of the gel polymer electrolyte, the disadvantages of leakage, easy corrosion of electrode materials and the like can be eliminated. The high temperature performance of the electrolyte can be improved by using an ionic liquid. By adding the organic solvent, the viscosity of the ionic liquid is reduced and the conductivity is enhanced. And by adding the film-forming additive, the problem of poor compatibility between the ionic liquid and graphite or a lithium electrode material can be solved. Experiments prove that the lithium ion battery gel polymer electrolyte provided by the invention is an elastic self-supporting electrolyte membrane, which has ionic conductivity up to the 10<-3>S/cm magnitude order, good high temperature stability and safety, and has good compatibility with a lithium cathode or a graphite cathode material. Lithium ions can undergo effective lithium insertion and removal circulation, and can achieve high capacity when applied to lithium ion battery charge-discharge cycle.

The invention relates to a preparation method for a molybdenum disulfide/nitrogen-doped graphene three-dimensional composite material. The preparation method comprises the steps: preparing a few-layer molybdenum disulfide nanosheet dispersion solution from molybdenum disulfide powder serving as a raw material and N-methyl pyrrolidone serving as an intercalation solvent by an ultrasonic solvent thermal intercalation stripping method, mixing the few-layer molybdenum disulfide nanosheet dispersion solution with a graphene oxide aqueous solution to prepare a uniform molybdenum disulfide/graphene oxide dispersion system with different proportions, forming a compact molybdenum disulfide/graphene oxide composite structure from a solution under the action of sodium ions in a solution self-assembling process, performing in-situ reducing by using hydrazine hydrate to obtain a molybdenum disulfide/reduced graphene oxide three-dimensional composite system, and performing high-temperature nitrogen doping process under an ammonia atmosphere so as to obtain the molybdenum disulfide/nitrogen-doped graphene three-dimensional composite material. The method can be used for better balancing component control and structure control; the process is simple, and large-scale production is easy. The obtained molybdenum disulfide/nitrogen-doped graphene three-dimensional composite material can be applied to negative electrodes of high-performance lithium batteries.

The invention discloses a method for manufacturing anode materials for sodium ion batteries and application of the anode materials. Different types of metal are doped in each anode material. The anode materials can be expressed as Na<2/3>A<1-x>B<x>O<2>. The A represents selected transition metal with electrochemical activity, the B represents the doped metal, and the content x of the B is higher than 0 and is lower than or equal to 0.20. The method includes mixing materials at earlier stages; drying the materials and carrying out heat treatment on the materials; compressing the materials to obtain sheets; calcining the sheets at high temperatures to obtain the metal-doped anode materials for the sodium ion batteries. The method and the application have the advantages that the anode materials for the sodium ion batteries have high discharge voltages and are high in circulation capacity and excellent in stable circulation, accordingly, the specific capacity and the energy density of the batteries can be greatly improved when the anode materials are used as anodes of the sodium ion batteries, and the anode materials have excellent application prospects.

The invention discloses a method for forming lithium manganese power cells. The method comprises the following steps: injecting liquid to a power cell and allowing for standing for a first preset time thereafter; allowing for standing for a second preset time after constant-current charge to a first preset voltage with a first preset current; allowing for standing for a third preset time after constant-current charge to a second preset voltage with a second preset current; and performing constant-current charge to a third preset voltage with a third preset current, then performing constant-current discharge to a fourth preset voltage with a third preset current, and repeating the step for a preset number of times. The method provided by an embodiment of the invention can form a compact and stable SEI film and completely eliminate gases generated in formation. The method effectively improves the available capacity of cells, the cycling performance, the consistency and the safety. Besides, the method is easy and reliable, is particularly suitable for lithium manganese power cells for electric vehicles, and can be promoted for wide applications.

A lithium ion electrochemical cell having high charge/discharge capacity, long cycle life and exhibiting a reduced first cycle irreversible capacity, is described. The stated benefits are realized by the addition of at least one carbonate additive to an electrolyte comprising an alkali metal salt dissolved in a solvent mixture that includes ethylene carbonate and an equilibrated mixture of dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate. The preferred additive is either a linear or cyclic carbonate containing covalent O-X and O-Y bonds on opposite sides of a carbonyl group wherein at least one of the O-X and the O-Y bonds has a dissociation energy less than about 80 kcal/mole.

The invention discloses a lithium-sulfur battery composite anode material and a preparation method and application thereof. The lithium-sulfur battery composite anode material is characterized in that the anode material is formed by mixing and heating sulfur and a conductive network embedded graded porous carbon carrier, and sulfur is evenly dispersed in carbon pore channels of the conductive network embedded graded porous carbon carrier in the form of active nano particles and molecules. According to the conductive network embedded graded porous carbon carrier, porous carbon containing a three-level pore structure of micropores, mespores and macropores is adopted as a base body, and a high-conductivity nano carbon material is embedded into the base body to form a conductive network. The lithium-sulfur battery composite anode material can keep high circulating capacity, excellent stable circulation performance, good high-magnification (high-current-density charge and discharge) performance within a large temperature range including room temperature, the raw materials adopted in the material preparing process are cheap, available and environmentally friendly, the preparation process is simple, amplification is easy, and good application prospects are achieved.

Belonging to the technical field of new energy materials and electrochemistry, the invention discloses a method for preparation of a Li2FeSiO4 and Li2FeSiO4/C anode material. The method provided by the invention adopts an inorganic trivalent iron salt as the iron source and takes an organic dispersant as the carbon source. In the process of introducing the organic dispersant into co-precipitation, the dispersant is adsorbed on the surface of the obtained precipitate, thus effectively preventing agglomeration of precipitate particles. In a calcination process, the organic dispersant undergoes in situ decomposition to generate amorphous carbon coating the particles, thereby preventing further growth of the particles. At the same time, the amorphous carbon forms a conductive network on the material surface, thus increasing electronic conduction of the material and improving the electrochemical performance of the material. The method provided by the invention has the advantages of cheap raw materials and simple preparation process, and is easy for industrial production. By adjusting the dispersant content, the synthesized Li2FeSiO4 and Li2FeSiO4/C material has uniform particle size, good dispersibility, and excellent electrochemical performance, thus being a lithium ion battery anode material with broad application prospects.

A preparation method of a high-voltage-resistant solid polymer electrolyte includes the steps of: 1) according to certain ratio, dissolving a polymer substrate, lithium salt, and an inorganic additivein anhydrous acetonitrile and stirring the mixture at room temperature to obtain a uniform solution, wherein the polymer substrate is polyoxyethylene, the lithium salt is lithium bistrifluoromethylsulfonimide or lithium perchlorate; the inorganic additive is nano-wires or nano-particles of zinc borate, aluminum borate, sodium tetraborate, barium metaborate or calcium borate, the mass ratio of thepolyoxyethylene to the lithium salt EO : Li<+> is 10-20:1, and the mass of the inorganic additive is not more than 20% of the total mass of the polymer substrate and lithium salt; 2) pouring the solution into a polytetrafluoroethylene mold to volatilize the solution until completely dried, thus preparing the solid polymer electrolyte. The method improves the high-voltage resistance of the solid polymer electrolyte, so that the product fits a high-voltage ternary cathode material and energy density and safety of an all-solid-state battery are improved.

The invention discloses a binder, and a preparation method and application thereof. In an embodiment, the preparation method comprises the steps of, in a protective atmosphere, fully reacting polyacid with an ethyleneamine monomer, dissolving a reaction product into an organic solvent, carrying out full washing through a mixture of water and methanol and then removing an organic solvent to obtain an oligomer; and in the protective atmosphere, reacting the oligomer with carbomite to obtain the binder. The preparation technology is simple and low in cost and large-scale implementation is facilitated; and the obtained binder is a bright yellow translucent polymer, has the characteristics of glass and rubber, and not only has excellent ductility, but also has self-repairing property. The binder is excellent adaptation with a current collector or an electrode material when used for an electrode, and the structure stability of an electrode slice can be effectively improved, so that the overall electrochemical properties of a battery are greatly improved.

The invention relates to a method for preparing a graphene-loaded antimony nanotube negative electrode material for a sodium ion battery and application of the graphene-loaded antimony nanotube negative electrode material. The preparation method comprises the steps of dissolving sodium sulfide with a certain mole ratio in ethylene glycol to obtain a solution A; dissolving antinomy chloride with acertain mole ratio in the ethylene glycol to obtain a solution B, dropwise adding the solution A into the solution B, and performing stirring to obtain a solution C; adding a graphene dispersion liquid with certain concentration into the solution C, transferring the mixed liquid to a high-pressure kettle with a polytetrafluoroethylene lining, and maintaining for a certain time under a certain temperature to obtain a synthesis product D; centrifugally separating the solvent thermal synthesis product D at 10,000rpm, washing the synthesis product D with deionized water and alcohol, and obtaininga product E after drying for 12 hours at 85 DEG C; and obtaining the graphene-loaded antimony nanotube composite material after the product E is annealed for a certain time in a mixed atmosphere of H2and Ar under a special temperature. The graphene-loaded antimony nanotube negative electrode material has the advantages of high cycle specific capacity, high coulombic efficiency and stable cycle property.

The invention discloses a high-cycling-capacity ZrCo-based hydrogen isotope storage alloy, preparation of the alloy and application of the alloy to storage, supply and recovery of hydrogen isotopes. The chemical general formula of the high-cycling-capacity ZrCo-based hydrogen isotope storage alloy is Zr(1-x)NbxCo(1-y)Niy, wherein x is larger than 0 but smaller than or equal to 0.5, and y is largerthan 0 but smaller than or equal to 0.5. A preparation method of the alloy includes the following steps that (1) Zr, Nb, Co and Ni elementary substance raw materials are mixed according to the proportion in the chemical general formula and then are placed into a magnetic suspension induction smelting furnace; and (2) smelting, cooling and solidifying are performed under the protection of an argonatmosphere to prepare the high-cycling-capacity ZrCo-based hydrogen isotope storage alloy. The method is simple in step and high in safety, the prepared hydrogen isotope storage alloy is not requiredto be subjected to vacuum operation in the circulation process, the method is still applicable in complex hydrogen isotope scenes, and the method has long-term significance in promoting application and popularization of the ZrCo-based alloy in the field of hydrogen isotope storage.

The invention relates to a positive pole piece of a lithium-sulfur battery based on an L-cysteine or L-cystine agent as an additive and a preparation method thereof. According to the method, based on gelatin as a binder, the L-cysteine or L-cystine additive is introduced, thus the redox property of a sulphur electrode is obviously improved, and the electrochemistry reversibility and circulation stability of the lithium-sulfur battery are significantly improved.