Fast‐Charging Lithium–Sulfur Batteries Enabled via Lean Binder Content,Small

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Fast‐Charging Lithium–Sulfur Batteries Enabled via Lean Binder Content
Small ( IF 13.0 ) Pub Date : 2020-11-02 , DOI: 10.1002/smll.202004372
Soochan Kim ₁ , Dong Hyun Kim ₂ , Misuk Cho ₁ , Won Bo Lee ₂ , Youngkwan Lee ₁

Affiliation

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.

中文翻译：

通过精简活页夹内容启用快速充电的锂硫电池

锂硫电池（LSB）等下一代储能设备面临着诸多挑战，包括快速充电和大功率输送。因此，有必要通过有效的电化学系统来提高电极的稳定性。在这项工作中，通过稀薄的粘合剂含量，即使在高速率下也能获得持久的硫阴极。粘合剂由与羧化丁腈橡胶（XNBR）交联的壳聚糖组成，由于极性壳聚糖和弹性体XNBR的协同作用，它对多硫化锂具有很高的亲和力，并具有强大的机械性能。尽管使用了极少量的粘合剂（3 wt％），LSB仍显示出高度稳定的长期循环性能，在5和10 C下进行500次循环后，容量保持率衰减值为0.026％和0.029％。在20 C的超高充放电速率下为^-1。这种方法可能会显着改善硫阴极的设计，并为制造商业上可行的下一代储能设备铺平了道路。

更新日期：2020-11-27

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