电解质
阳极
锂(药物)
金属
膜
材料科学
电化学
光致聚合物
化学工程
离子液体
氧化物
酰亚胺
高分子化学
电极
复合材料
化学
冶金
单体
有机化学
聚合物
医学
催化作用
生物化学
物理化学
工程类
内分泌学
作者
Yinping Qin,Hefeng Wang,Jingjing Zhou,Ruyi Li,Junchul Chun,Yi Wan,Xiaoyi Wang,Zhenlian Chen,Xiaolei Wang,Yang Liu,Bingkun Guo,Deyu Wang
标识
DOI:10.1002/anie.202402456
摘要
The solid electrolyte interphase (SEI) on Li metal anode tends to breakdown and undergo reconstruction during operation, causing Li‐metal batteries to experience accelerated decay. Notably, an SEI membrane with self‐healing characteristics can help considerably in stabilizing the Li–electrolyte interface; however, uniformly fixing the repairing agent onto the anode remains a challenging task. By leveraging the noteworthy film‐forming attributes of bis(fluorosulfonyl)imide (FSI−) anions and the photopolymerization property of the vinyl group, the ionic liquid 1‐vinyl‐3‐methylimidazolium bis(fluorosulfonyl)imide (VMI‐FSI) was crosslinked with polyethylene oxide (PEO) in this study to form a self‐healing film fixing FSI− groups as the repairing agent. When they encounter lithium metal, the FSI− groups are chemically decomposed into LiF & Li3N, which assist forming SEI membrane on lithium sheet and repairing SEI membrane in the cracks lacerated by lithium dendrite. Furthermore, the FSI‐ anions exchanged from film are electrochemically decomposed to generate inorganic salts to strengthen the SEI membrane. Benefiting from the self‐healing behavior of the film, Li/LiCoO2 cells with the loading of 16.3 mg cm−2 exhibit the initial discharge capacities of 183.0 mAh·g−1 and are stably operated for 500 cycles with the retention rates of 81.4%, operated between 3.0~4.5 V vs. Li+/Li.
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