用超长寿命锂硫电池中富含硫的聚离子液体阴极材料捕集多硫化物,ChemSusChem

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用超长寿命锂硫电池中富含硫的聚离子液体阴极材料捕集多硫化物
ChemSusChem ( IF 7.5 ) Pub Date : 2020-01-21 , DOI: 10.1002/cssc.201903122
Xu Liu ₁ , Yu Lu ₁ , Qinghui Zeng ₁ , Pingping Chen ₁ , Zhenfeng Li ₁ , Xin Wen ₁ , Wen Wen ₁ , Zengxi Li ₁ , Liaoyun Zhang ₁

Affiliation

通过逆硫化合成的富硫聚合物有望成为Li-S电池的阴极，并且可以抑制穿梭效应以改善Li-S电池的循环性能。然而，开发具有新化学功能的富硫共聚物以增强Li-S电池的性能仍然是一个巨大的挑战。在本报告中，将含有离子液体链段的富含硫的聚合物阴极名为聚（硫共-1-乙烯基-3-烯丙基咪唑鎓溴化物）[聚（S-共-DVIMBr）]通过S的逆硫化得到的₈DVIMBr并首次用作阴极。这种富硫的离子液体阴极通过C-S的稳定化学键合和多硫化锂的强阳离子吸收的联合效应，有效地抑制了穿梭效应，这已通过DFT计算得到了证实。特别是，带有聚（S- co- DVIMBr）阴极的Li-S电池即使在900个循环中仍可实现90.22％的高容量保持率。开发富硫的聚离子液体可能会提供一种新的策略，将带有阳离子的官能团引入正极材料中，以抑制穿梭效应并改善Li-S电池的性能。

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Trapping of Polysulfides with Sulfur‐Rich Poly Ionic Liquid Cathode Materials for Ultralong‐Life Lithium–Sulfur Batteries

Sulfur‐rich polymers synthesized by inverse vulcanization are promising cathodes for Li–S batteries and can suppress the shuttle effect to improve the cycling properties of Li–S batteries. However, developing a sulfur‐rich copolymer with new chemical functionality to enhance performance of Li–S batteries remains a huge challenge. In this report, a sulfur‐rich polymer cathode containing ionic liquid segments named poly(sulfur‐co‐1‐vinyl‐3‐allylimidazolium bromide) [poly(S‐co‐DVIMBr)] was obtained by the inverse vulcanization of S₈ with DVIMBr and used as cathode for the first time. This sulfur‐rich poly ionic liquid cathode showed effective suppression of the shuttle effect through joint effects of the stable chemical bonding of C−S and strong cation absorption for lithium polysulfides, which was confirmed by DFT calculations. In particular, the Li–S cell with poly(S‐co‐DVIMBr) cathode delivered high capacity retention of 90.22 % even over 900 cycles. Developing sulfur‐rich poly ionic liquids may provide a new strategy of introducing the functional groups with cations into the cathode materials for suppressing the shuttle effect and improving the performance of Li–S batteries.

更新日期：2020-01-23

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