Abstract: The present application provides an electrolyte for lithium ion battery which comprising a mixture of organic solvents consisting of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and carboxylate ester, wherein a mass ratio of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and carboxylate ester is (20%-30%):(45%-55%):(10%-20%):(5%-15%); a mixture of additives consisting of vinylene carbonate, propane sultone, fluorinated ethylene carbonate and perfluorohexylsulfonyl fluoride; and a lithium salt. The electrolyte for lithium ion battery provided according to the present application has good wettability and high absorption rate. The present application also provides a lithium ion battery with high energy density, small internal resistance, good cycle performance and good charge and discharge performance.

Abstract: A battery capacity grading circuit includes a power supply, a first switch module, an inductor, a sampling module, a battery, a first control module, a second control module, and a second switch module. The first switch module is electrically coupled with the power supply, the inductor and the first control module. The sampling module is electrically coupled with inductor, the second switch module, and the first control module. The second switch module is electrically coupled with the battery and the second control module. The battery is electrically coupled with first control module. The second control module is electrically coupled with the first control module. The power supply charges the battery through the first switch module, the inductor, the sampling module, and the second switch module. The battery discharges to the power supply through the second switch module, the sampling module, the inductor, and the first switch module.

Abstract: The present application provides a method for modifying lithium iron phosphate cathode material, comprising steps of: 1) mixing a binder and a metal-containing modifier at a certain proportion to form a first slurry, wherein the binder is a mixture of ammonium chloride and a phosphate organic binder or a mixture of ammonium chloride and an inorganic binder; 2) mixing the first slurry and lithium iron phosphate powder at a certain proportion to form a second slurry; 3) heating the second slurry at 300-400° C. for 4-8 hours to form a solidified slurry; 4) heating the solidified slurry at 600-700° C. for 36-48 hours to obtain a modified lithium iron phosphate cathode material. The present application also provides a cathode plate and a lithium ion battery including the same.

Abstract: The present application provides a method for preparing precursor of nickel-cobalt-aluminum ternary cathode material, comprising steps of: 1) mixing a nickel salt solution, a cobalt salt solution, and an aluminum salt solution at a molar ratio of Ni:Co:Al=(0.6-0.9):(0.05-0.3):(0.01-0.1) to obtain a first mixture; 2) adding the first mixture into ammonia water, stirring, and adjusting pH by an alkaline solution to obtain a second mixture with a pH?12; 3) adding an appropriate amount of additive to the second mixture, stirring, and ageing for 10-24 h to obtain a colloid; 4) washing the colloid and concentrating by centrifugation to obtain a gel; 5) drying the gel at 200-300° C. for 4-8 h, and sintering at 1100-1600° C. for 3-6 h to obtain a precursor of nickel-cobalt-aluminum ternary cathode material. The present application also provides a cathode plate and a lithium ion battery including the same.

Abstract: The present application provides a method for preparing negative electrode of lithium ion battery, wherein a negative electrode is obtained by plating a stannum-silicon composite layer and a stannum-carbon composite layer on the surface of a negative current collector. The negative electrode prepared according to the present application could solve the problem of large volume change during charge and discharge processes, so as to improve the cycle performance. The present application also provides a lithium ion battery using the negative electrode mentioned above. The lithium ion battery provided according to the present application has characteristics of high energy density, good charge and discharge performance, and good cycle performance.

Abstract: A battery is described. The battery is composed of a graphene oxide-sulfur (GO-S) nanocomposite cathode, a separator, an anode, and an electrolyte.

Abstract: The present application provides an electrolyte for lithium ion battery which comprising a mixture of organic solvents consisting of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and carboxylate ester, wherein a mass ratio of ethylene carbonate, ethyl methyl carbonate, dimethyl carbonate and carboxylate ester is (20%-30%):(45%-55%):(10%-20%):(5%-15%); a mixture of additives consisting of vinylene carbonate, propane sultone, fluorinated ethylene carbonate and perfluorohexylsulfonyl fluoride; and a lithium salt. The electrolyte for lithium ion battery provided according to the present application has good wettability and high absorption rate. The present application also provides a lithium ion battery with high energy density, small internal resistance, good cycle performance and good charge and discharge performance.

Abstract: The present application provides a method for modifying lithium iron phosphate. According to the method for modifying lithium iron phosphate of the present application, lithium iron phosphate is modified by using a graphite oxide and a honeycomb carbon material with large specific area and big pore size, wherein, the graphite oxide is obtained by oxidizing graphite with concentrated nitric acid and concentrated phosphoric acid, the honeycomb carbon material is obtained by adjusting the temperature of a mixture consisting of lithium carbonate, sodium carbonate and potassium carbonate, injecting CO2, and controlling the current density of the electricity for electrolysis. The method for modifying lithium iron phosphate could improve the conductivity of lithium iron phosphate, shorten the migration path and increase the migration rate of lithium ions. The present application also provides a positive electrode using the modified lithium iron phosphate and a lithium ion battery including the positive electrode.

Abstract: The present application provides a method for preparing silicon-carbon composite. The silicon-carbon composite prepared according to the present application is suitable to be an active material for negative electrode of lithium ion battery, which could not only ensure high capacity of silicon but also have good cycle performance and good charge and discharge performance. The present application also provides a negative electrode comprising a copper foil and a slurry including the mixture of a conductive agent, a binder, solvents and the silicon-carbon composite prepared according to the method for preparing silicon-carbon composite of the present application; and a lithium ion battery comprising a shell, a winding core positioned in the shell, electrolyte received in the shell and immersing the winding core, wherein the winding core comprising a positive electrode, separators and the negative electrode provided according to the present application.

Abstract: A battery is described. The battery is composed of a graphene oxide-sulfur (GO—S) nanocomposite cathode, a separator, an anode, and an electrolyte.

Abstract: The loss of sulfur cathode material as a result of polysulfide dissolution causes significant capacity fading in rechargeable lithium/sulfur cells. Embodiments of the invention use a chemical approach to immobilize sulfur and lithium polysulfides via the reactive functional groups on graphene oxide. This approach obtains a uniform and thin (˜tens of nanometers) sulfur coating on graphene oxide sheets by a chemical reaction-deposition strategy and a subsequent low temperature thermal treatment process. Strong interaction between graphene oxide and sulfur or polysulfides demonstrate lithium/sulfur cells with a high reversible capacity of 950-1400 mAh g?1, and stable cycling for more than 50 deep cycles at 0.1 C.

Abstract: The loss of sulfur cathode material as a result of polysulfide dissolution causes significant capacity fading in rechargeable lithium/sulfur cells. Embodiments of the invention use a chemical approach to immobilize sulfur and lithium polysulfides via the reactive functional groups on graphene oxide. This approach obtains a uniform and thin (˜tens of nanometers) sulfur coating on graphene oxide sheets by a chemical reaction-deposition strategy and a subsequent low temperature thermal treatment process. Strong interaction between graphene oxide and sulfur or polysulfides demonstrate lithium/sulfur cells with a high reversible capacity of 950-1400 mAh g?1, and stable cycling for more than 50 deep cycles at 0.1 C.

Abstract: The loss of sulfur cathode material as a result of polysulfide dissolution causes significant capacity fading in rechargeable lithium/sulfur cells. Embodiments of the invention use a chemical approach to immobilize sulfur and lithium polysulfides via the reactive functional groups on graphene oxide. This approach obtains a uniform and thin (˜tens of nanometers) sulfur coating on graphene oxide sheets by a chemical reaction-deposition strategy and a subsequent low temperature thermal treatment process. Strong interaction between graphene oxide and sulfur or polysulfides demonstrate lithium/sulfur cells with a high reversible capacity of 950-1400 mAh g?1, and stable cycling for more than 50 deep cycles at 0.1 C.

Abstract: The loss of sulfur cathode material as a result of polysulfide dissolution causes significant capacity fading in rechargeable lithium/sulfur cells. Embodiments of the invention use a chemical approach to immobilize sulfur and lithium polysulfides via the reactive functional groups on graphene oxide. This approach obtains a uniform and thin (˜tens of nanometers) sulfur coating on graphene oxide sheets by a chemical reaction-deposition strategy and a subsequent low temperature thermal treatment process. Strong interaction between graphene oxide and sulfur or polysulfides demonstrate lithium/sulfur cells with a high reversible capacity of 950-1400 mAh g?1, and stable cycling for more than 50 deep cycles at 0.1 C.