期刊
JOURNAL OF POWER SOURCES
卷 366, 期 -, 页码 1-8出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.09.009
关键词
Extrinsic pseudocapacitance; Lithiation-induced structural optimization; High rate; Long-lived; SnS anode; Lithium ion battery
资金
- National Natural Science Foundation of China [51771236, 21373081]
- Innovation-Driven Project of Central South University [2017CX002]
- Program for Shenghua Overseas Talents from Central South University
- Self-established Project of State Key Laboratory of Powder Metallurgy
Here, we report a new enhanced extrinsic pseudocapacitve Li-ion storage mechanism via lithiation-induced structural optimization strategy. The flower-like C@SnS and bulk SnS exhibit initial capacity decay and subsequent increase of capacity on cycling. After a long-term lithiation/delithiation process, flower-like C@SnS and bulk SnS exhibit improved rate performance and reversible capacity in comparison with those of initial state. Moreover, a high capacity of 530 mAh(-1) is still remained even after 1550 cycles at a high current density of 5.0 A g(-1) for flower-like C@SnS after pre-lithiation of 350 cycles. According to the comprehensive analysis of structural evolution and electrochemical performance, it demonstrates that SnS electrodes experience crystal size reduction and further amorphization on cycling, which enhances the reversibility of conversion reaction for SnS, leading to increasing capacity. On the other hand, surface-dominated extrinsic pseudocapacitive contribution results in enhanced rate performance because electrodes expose a large fraction of Li+ sites on surface or near-surface region with structural optimization on cycling. This study reveals that extrinsic pseudocapacitance of SnS can be stimulated via lithiation-induced structural optimization, which gives rise to high-rate and long-lived performances. (C) 2017 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据