多硫化物
材料科学
弹性体
阴极
储能
锂(药物)
硫黄
天然橡胶
电化学
化学工程
电极
纳米技术
复合材料
化学
电解质
功率(物理)
医学
物理
物理化学
量子力学
工程类
冶金
内分泌学
作者
Soochan Kim,Dong Hyun Kim,Misuk Cho,Won Bo Lee,Youngkwan Lee
出处
期刊:Small
[Wiley]
日期:2020-11-01
卷期号:16 (47)
被引量:26
标识
DOI:10.1002/smll.202004372
摘要
Next-generation energy storage devices such as lithium-sulfur batteries (LSBs) face several challenges including fast charging and high-power delivery. Thus, it is necessary to improve the stability of the electrodes with efficient electrochemical system. In this work, a durable sulfur cathode even at high rates is enabled via lean binder content. The binder consists of a chitosan cross-linked with a carboxylated nitrile-butadiene rubber (XNBR), which exhibits high affinity toward lithium polysulfide along with robust mechanical properties because of the synergistic effect of the polar chitosan and the elastomeric XNBR. Despite using extremely small content of binder (3 wt%), the LSB shows a highly stable long-term cycling performance with capacity retention decay values of 0.026% and 0.029% after 500 cycles at 5 and 10 C. Moreover, the cell shows an outstanding specific capacity of 228 mAh g-1 at an ultrahigh charge-discharge rate of 20 C. This approach may significantly improve the design of the sulfur cathode and pave a facile way to fabricate commercially viable next-generation energy storage devices.
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