A comparison of core–shell Si/C and embedded structure Si/C composites as negative materials for lithium-ion batteries

作     者：Shuai-Jin Wu Zhao-Hui Wu Sheng Fang Xiao-Peng Qi Bing Yu Juan-Yu Yang Shuai-Jin Wu;Zhao-Hui Wu;Sheng Fang;Xiao-Peng Qi;Bing Yu;Juan-Yu Yang

作者机构：Grinm Group Co.Ltd.Beijing 100088China General Research Institute for Nonferrous MetalsBeijing 100088China China Automotive Battery Research Institute Co.Ltd.Beijing 101407China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2021年第40卷第9期

页      面：2440-2446页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the National Key R&D Program of China(No.2016YFB0100400) the National Natural Science Foundation of China(Nos.51504032,51604032 and U1664256) 

主　　题：Lithium-ion battery Negative materials Silicon-based materials Material structure 

摘      要：Silicon materials have attracted wide attention as negative materials due to exceptional gravimetric capacity and abundance. The strategy of using nano-silicon materials as structural units to construct nano/micro-structured silicon-based negative materials for lithium-ion batteries has come into sight in recent years. In order to provide guidance for the material structure design of micro-sized silicon-based negative materials in practical application, in this work, two commercialized nano/micro-structured silicon-based negative materials with a specific capacity of about 650 mAh·g^(-1) were investigated and compared in the aspects of material microstructure, electrochemical performance of half cells, and electrode morphological evolution during cycling. The cycling performance(with capacity retention ratio of about 17% higher after 100 cycles) and electrode structure maintenance of the embedded structure Si/C material are superior to those of core–shell Si/C material. This research can provide guidance on design and application of nano/micro-structured silicon-based negative materials.