Abstract: A cylindrical battery includes a housing having an accommodating space; and a negative electrode sheet, a first separator, a positive electrode sheet, and a second separator that are wound multiple turns forming an electrode core. The housing is co-axial with the electrode core that is disposed in the accommodating space. The positive electrode sheet includes a positive electrode material layer and a positive electrode foil layer. The negative electrode sheet includes a negative electrode material layer and a negative electrode foil layer. Some of the wound turns of the positive electrode foil layer extends toward an end of the housing to form a positive electrode tab. Some of the wound turns of the negative electrode foil layer extends toward another end of the housing to form the negative electrode tab.

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: 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.