Silicon-carbon negative electrode material, preparation method and application thereof

Abstract

The embodiment of the present application relates to a kind of silicon-carbon negative electrode material and its preparation method and application, the silicon-carbon negative electrode material is core-shell-shell structure, from inside to outside include successively: inner core complex, including porous carbon matrix and the nano silicon particles dispersed in the porous carbon matrix pore;Interface modification carbon layer, cladding in the outer surface of inner core complex;Solid electrolyte layer, uniformly cladding in the outer surface of interface modification carbon layer, solid electrolyte layer includes the phosphate containing metal cation M;Conductive carbon coating, cladding in the outer surface of solid electrolyte layer;The surface of interface modification carbon layer and the surface of conductive carbon coating all contain hydroxyl and / or carboxyl, between solid electrolyte layer and interface modification carbon layer, and between with conductive carbon coating, all through hydroxyl and / or carboxyl, with the metal cation M in solid electrolyte layer under heat treatment condition reaction, in situ generate M-C bond, to realize chemical bonding.

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