文献类型：期刊文献

英文题名：Metal-Chelated Biomimetic Polyelectrolyte as a Powerful Binder for High-Performance Micron Silicon Anodes

作者：Guan, Xiang[1];Yong, Yuanxing[1,2];Wu, Qingping[1,2];Zhang, Xiaowan[1];Guo, Xuhong[1];Li, Chilin[2];Xu, Jun[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, 585 He Shuo Rd, Shanghai 201899, Peoples R China

年份：2020

卷号：8

期号：7

外文期刊名：ENERGY TECHNOLOGY

收录：;EI(收录号：20202408804515);WOS:【SCI-EXPANDED(收录号:WOS:000538608600001)】；

基金：X.G. and Y.Y. contributed equally to this work. This work was supported by National Key R&D Program of China (2016YFB0901600), National Natural Science Foundation of China (21476143, 51003028, 51772313, U1830113 and 51802334), and Petro China Innovation Foundation (2016D-5007-0211).

语种：英文

外文关键词：biomimetic polyelectrolytes; lithium-ion batteries; metal-chelated bonds; micron silicon anodes

摘要：High-capacity silicon anodes have attracted tremendous interest for next-generation lithium-ion batteries (LIBs). However, its further application is limited by the large volume expansion during cycling. Designing nanostructured silicon is an effective strategy to acquire high-performance anodes, but it will face problems of high cost and poor coulombic efficiency. As a comparison, surface modification of micron silicon is more economically viable. Herein, a novel route is proposed to synthesize metal-chelated biomimetic polyelectrolyte as a powerful binder, which wraps micron silicon particles in a thin Fe3+-polydopamine (PDA) layer with a thickness of 2-5 nm. The introduced Fe3+ can form powerful metal-chelated bonds with PDA at appropriate hydrothermal temperature (160 degrees C). As a result, the mechanical strength of the protective layer is enhanced and the electrochemical activity of micron silicon is improved. Meanwhile, the 3D crosslinking structure formed through the esterification between the elastic polymer layer and polyacrylic acid (PAA) further guarantees the structural stability of anodes. Batteries using Si@Fe3+-PDA-160/PAA anode exhibit excellent cycling performance with stable capacity of 2000 mAh g(-1) over 200 cycles at 0.5 C and high capacity retention ratio of 80% after 100 cycles at 0.1 C.