Enhanced electrochemical properties of a Si-based anode using an electrochemically active polyamide imide binder

被引:141
|
作者
Choi, Nam-Soon [1 ]
Yew, Kyoung Han [1 ]
Choi, Wan-Uk [1 ]
Kim, Sung-Soo [1 ]
机构
[1] Samsung SDI Co Ltd, Corp R&D Ctr, Energy Lab, Yongin 446577, Gyeonggi Do, South Korea
关键词
Si-based electrode; polyamide imide; PVdF; binder; volume expansion; FT-IR;
D O I
10.1016/j.jpowsour.2007.11.082
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Polyamide imide (PAI), one of the classes of copolyimides containing both high mechanical properties and processibility, is used as a polymeric binder of a Si particulate electrode. The initial coulombic efficiency is improved from 28.9% (Si-PVdF) to 74.9% (Si-PAI) by introducing a PAI binder into a Si-based electrode. Variations in thickness measured at various states of charge (SOCs) and depths of discharge (DODs) indicate that the PAI binder is a much more effective restraint on volume expansion in active Si materials during the charging process than poly(vinylidene fluoride) (PVdF) binder. The discharge capacity of Si-PAI electrodes is approximately 1700 mAh g(-1) after 20 cycles, which is attributed to the excellent maintenance of an electrical-conducting network during cycling. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:590 / 594
页数:5
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