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1. (WO2018040542) SILICON-BASED COMPOSITE NEGATIVE ELECTRODE SHEET AND PREPARATION METHOD THEREFOR, AND LITHIUM ION SECONDARY BATTERY

Pub. No.:    WO/2018/040542    International Application No.:    PCT/CN2017/077063
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Sat Mar 18 00:59:59 CET 2017
IPC: H01M 4/134
H01M 4/1395
H01M 4/36
H01M 4/38
H01M 10/0525
Applicants: HUAWEI TECHNOLOGIES CO., LTD.
华为技术有限公司
Inventors: YANG, Wanlu
杨婉璐
WANG, Zhiyong
王志勇
XIA, Shengan
夏圣安
Title: SILICON-BASED COMPOSITE NEGATIVE ELECTRODE SHEET AND PREPARATION METHOD THEREFOR, AND LITHIUM ION SECONDARY BATTERY
Abstract:
Provided is a silicon-based composite negative electrode sheet, comprising a current collector and a one-dimensional silicon-based shell-core composite structure array arranged on the current collector; the one-dimensional silicon-based shell-core composite structure takes a core negative electrode material grown in situ on the current collector as a core, and a silicon-based material as a shell; the core negative electrode material is one or more of a carbon nanotube, a carbon nanofiber, porous carbon, graphene, a lithium intercalation metal and alloy, lithium titanate, a transition metal oxide, a bimetal oxide, a metal sulfide, a metal nitride and a metal phosphorus compound; and the core negative electrode material is arranged on the current collector in a one-dimensional vertical array structure. The silicon-based composite negative electrode sheet has a high rate capability and a high cycle stability, can effectively improve the low conductivity of silicon and solve the problem of chalking and polarization caused by the expansion of same, and improve the capacity and cycle life of an electrode. Also provided are a preparation method for the silicon-based composite negative electrode sheet, and a lithium ion secondary battery comprising the silicon-based composite negative electrode sheet.