Abstract: 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.

Abstract: 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 ?m, and D90/D10<2.5; a 002 interplanar spacing ranging from 0.336 to 0.360 nm, I002/I110?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 m2/g and smaller than 10.0 m2/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.

Abstract: 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.