Btr New Material Group Co., Ltd.

Haihui Zhou

Jianguo Ren

Dongdong Li

Min Yue

Youyuan Huang

Xueqin He

Chengkun Zhou

Peng He

Tao Xu

Hang Dong

Xuan Wu

Junhui Lai

Xingyang Liu

Xiujun Pan

Daofu Zhang

The present application provides a negative electrode material, a preparation method thereof, and a lithium ion battery. The negative electrode material comprises a first graphite core and a composite coating layer coated on the first graphite core. The composite coating layer comprises a second graphite inner layer formed on the surface of the first graphite core and an amorphous carbon outer layer formed on the surface of the second graphite inner layer. The second graphite inner layer is graphite microcrystal. The preparation method comprises: mixing the first graphite and the second graphite and performing the coating treatment to obtain the first graphite coated with the second graphite, wherein the second graphite is graphite microcrystals; and making the first graphite coated with the second graphite, coated with carbon, to obtain the negative electrode material. The negative electrode material provided in the present application utilizes the mutual cooperation between the second graphite inner layer and the amorphous carbon outer layer in the composite coating layer to make the negative electrode material have the high capacity, the low irreversible capacity, and the excellent power performance.

Negative electrode material and preparation method therefor, and lithium-ion battery

Anode material, preparation method thereof, and battery. Anode material includes graphite and carbon layer located on at least part of surface of graphite. Particle surface and particle section of anode material are respectively tested by Raman spectroscopy, peak area ratio of D characteristic peak within range of 1300 cmto 1350 cmto G characteristic peak within range of 1500 cmto 1580 cmis I/I, ratio of I/Imeasured on the particle surface is A, and ratio of I/Imeasured on particle section is B, and 1.22<A-B≤2.10. Particle surface of anode material is tested by adopting atomic force microscopy, 1 μm×1 μm test region is randomly selected on particle surface of anode material, arithmetic average value of height deviation absolute values relative to reference surface in test region is S nm, where 15 nm≤S≤60 nm. Anode material improves lithium-ion transport kinetics, initial Coulombic efficiency, and cycle performance.

Anode material, preparation method thereof and battery

Provided are a natural graphite, a modified natural graphite material prepared therefrom, a preparation method, and applications. The natural graphite has the following characteristics: a particle size D50 smaller than 10 μm, and D90/D10<2.5; a 002 interplanar spacing ranging from 0.336 to 0.360 nm, I/I≤35; a saturated tap density greater than or equal to 0.6 g/cc and smaller than 1.3 g/cc; and a specific surface area greater than or equal to 1.0 m/g and smaller than 10.0 m/g. The provided natural graphite has specific particle size, orientation, tap density and surface area and can serve as a raw material for preparing modified natural graphite material, and the prepared modified natural graphite material has high isotropy and thus has better rate performance and cycle performance.

Natural graphite, modified natural graphite material prepared therefrom, preparation method, and applications

Provided are a preparation method of a long-cycle modified graphite-based composite material and a lithium ion battery containing the material. The method including: (1) mixing a graphite material and a coating modifier; (2) placing the mixture into a self-pressurized reaction device, then placing the device in a heating apparatus to perform a self-pressurized impregnation experiment, during which temperature is controlled to increase in such a manner that the coating modifier is gradually liquefied after reaching a softening point, to completely impregnate the graphite material under self-pressurizing and to be distributed on a surface of the graphite material; (3) cooling; and (4) performing a heat treatment in an inert atmosphere to obtain the modified graphite-based composite material.

Preparation method for long-cycle modified graphite-based composite material and lithium ion battery comprising the material

A low-swelling graphite anode material, a preparation method thereof, and a lithium ion battery including the graphite anode material. The preparation method of the graphite anode material includes: (1) mixing a graphite raw material with a modifier, and then performing heating modification; (2) performing heat treatment on the modified graphite under a protective atmosphere; and (3) performing post-treatment on the heat-treated graphite to obtain the graphite anode material. The graphite anode material has an extremely low swelling rate, excellent cycle performance, and outstanding rate performance, an swelling rate being 24.3% or lower, a normal temperature 10C/1C discharge capacity retention rate being greater than 90%, and a capacity retention rate after charging and discharging for 300 times being 91% or greater.

Low-swelling graphite anode material, preparation method thereof and lithium ion battery

A natural graphite-based modified composite material, a preparation method therefor, and a lithium ion battery comprising the modified composite material. The natural graphite-based modified composite material comprises natural graphite and non-graphitized carbon coated on the inner and outer surfaces of the natural graphite. The preparation method comprises: (1) subjecting spherical natural graphite to isotropic treatment; (2) performing granularity control and shaping treatment; (3) subjecting the inner surface and the outer surface of the material obtained in step (2) to simultaneous modification; and (4) performing carbonization, so as to obtain a natural graphite-based modified composite material.

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Guangdong, China

Haihui Zhou