A Polymer-Reinforced SEI Layer Induced by a Cyclic Carbonate-Based Polymer Electrolyte Boosting 4.45 V LiCoO2 /Li Metal Batteries

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Rongxiang HuGuanglei Cui

Abstract

Lithium (Li) metal batteries (LMBs) are enjoying a renaissance due to the high energy densities. However, they still suffer from the problem of uncontrollable Li dendrite and pulverization caused by continuous cracking of solid electrolyte interphase (SEI) layers. To address these issues, developing spontaneously built robust polymer-reinforced SEI layers during electrochemical conditioning can be a simple yet effective solution. Herein, a robust homopolymer of cyclic carbonate urethane methacrylate is presented as the polymer matrix through an in situ polymerization method, in which cyclic carbonate units can participate in building a stable polymer-integrated SEI layer during cycling. The as-investigated gel polymer electrolyte (GPE) assembled LiCoO2 /Li metal batteries exhibit a fantastic cyclability with a capacity retention of 92% after 200 cycles at 0.5 C (1 C = 180 mAh g-1 ), evidently exceeding that of the counterpart using liquid electrolytes. It is noted that the anionic ring-opening polymerization of the cyclic carbonate units on the polymer close to the Li metal anodes enables a mechanically reinforced SEI layer, thus rendering excellent compatibility with Li anodes. The in situ formed polymer-reinforced SEI layers ...Continue Reading

References

Nov 19, 2011·Science·Bruce DunnJean-Marie Tarascon
Feb 24, 2015·Nature Communications·Jiangfeng QianJi-Guang Zhang
Mar 8, 2017·Nature Nanotechnology·Dingchang LinYi Cui
Jul 29, 2017·Chemical Reviews·Xin-Bing ChengQiang Zhang
Jan 21, 2018·Proceedings of the National Academy of Sciences of the United States of America·Liumin SuoJu Li
Apr 25, 2018·Journal of the American Chemical Society·Yutao LiJohn B Goodenough
Jul 18, 2018·Nature Nanotechnology·Xiulin FanChunsheng Wang
May 16, 2019·Chemical Communications : Chem Comm·Gi Hyeon MoonYong Soo Kang

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