Abstract: Provided are a composite material and a preparation method thereof, a negative electrode material, and a lithium ion battery. The negative electrode material includes at least one composite material, and the lithium ion battery includes at least one composite material. The composite material has a core-shell structure composed of an inner core and a hydrophobic coating layer, with the inner core including at least one lithium-containing silicon oxide, and the hydrophobic coating layer being used to cover the inner-core material.

Abstract: A negative electrode material and a preparation method therefor, and a lithium ion battery are provided. The negative electrode material comprises nanometer silicon, a silicon oxide, and crystalline Li2Si2O5, wherein the average grain size is Li2Si2O5 is lower than 20 nm.

Abstract: Provided are a composite negative electrode material, a preparation method therefor and a lithium battery. The composite negative electrode material comprises silicon-containing particles and a carbon coating layer coating at least part of the surface of silicon-containing particles. In Raman spectrum, the composite negative electrode material has a silicon characteristic peak A between 450 cm?1-550 cm?1, a carbon characteristic peak B between 1300 cm?1-1400 cm?1, a carbon characteristic peak C between 1530 cm?1-1630 cm?1, and a graphene structure characteristic peak D between 2500 cm?1-2750 cm?1. The preparation method comprises: in protective atmosphere, introducing reaction gas to react with silicon-containing particles, the reaction temperature being 700° C.-1450° C., and the reaction gas comprising a carbon-containing gas, so that at least part of the surface of silicon-containing particles form a carbon coating layer, so as to obtain the composite negative electrode material.

Abstract: Provided are a silicon composite negative electrode material and a preparation method therefor, and a lithium ion battery. The silicon composite negative electrode material comprises silicon composite particles and a carbon coating layer, wherein the carbon coating layer is coated on at least part of the surface of the silicon composite particle; and the silicon composite particle comprises silicon, a silicon oxide SiOx and a silicate containing the metal element M, wherein 0<x<2. The method comprises: condensing a silicon source vapor and a vapor containing the metal element M at 700-900° C. under a vacuum to obtain a silicon composite, the silicon composite comprising a silicon oxide SiOx and a silicate, wherein 0<x<2; and post-processing the silicon composite to obtain a silicon composite negative electrode material.

Abstract: A core-shell composite negative electrode material is made according to a preparation method and includes an application thereof. The composite negative electrode material includes: a core formed by a first active substance and a second active substance, and a carbon-coated shell serving as a third active substance. The first active substance is a sheet-like silicon-based material, the second active substance is a sheet-like graphite material, and the third substance is the carbon-coated shell. The composite material is applied to the negative electrode of a lithium ion battery, and has high specific capacity, wherein the capacity is greater than 400 mAh/g, and excellent cycle life.