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

Wiley - Tập 13 Số 4 - Trang 715-723 - 2020
Xu Liu1, Yu Lu1, Qinghui Zeng1, Pingping Chen1, Zhenfeng Li1, Xin Wen1, Wen Wen1, Zengxi Li1, Liaoyun Zhang1
1School of Chemical Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China

Tóm tắt

AbstractSulfur‐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.

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Wiley

Tập 13 Số 4

715-723

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