坚韧、弹性的氟化固体电解质界面稳定碳酸酯电解质中的锂金属

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中文摘要：锂金属负极和碳酸酯类电解液之间不稳定的界面是限制高比能锂金属电池循环寿命的关键挑战.本文使用含苯环的双酚A乙氧基化物二甲基丙烯酸酯(BAED)交联剂调节聚(丙烯酸六氟丁酯)(PHFBA),设计了一种弹性人造固体电解质中间相(RASEI)来解决这个问题.刚性BAED分子可以对柔性PHBA基体进行调控,实现从600％伸长率到90％压缩率的卓越回弹性,并具有超过2 MPa的高杨氏模量.RASEI可以适应锂金属较大的体积变化,并确保电池运行过程中锂金属与RASEI之间的紧密接触,促进均匀的锂沉积并减少副反应.因此,经过RASEI修饰的Li‖Li对称电池可以在1 mA cm-2和1 mAh cm-2下实现超过500小时的长期循环.对循环后锂金属进行测试分析表明锂枝晶的生长得到了有效的抑制.此外,搭配20 mg cm-2高阴极负载的NCM811软包电池在1 C下,经过200次循环后容量保持率超过85％.

外文标题：A tough,resilient,and fluorinated solid-electrolyte interphase stabilizing lithium metal in carbonate electrolytes

外文摘要：The unstable interface between lithium metal anodes and carbonate-based electrolytes is a key challenge limiting the cycling lifespan of high-energy lithium metal batteries.Here,a resilient artificial solid electrolyte interphase(RASEI)was designed by regulating poly(hexafluorobutyl ac-rylate)(PHFBA)matrix with the benzene-containing bi-sphenol A ethoxylate dimethacrylate(BAED)crosslinker to address this issue.The rigid BAED molecule can finely tune the flexible PHFBA matrix,enabling superior resilience from 600％elongation to 90％compression with a high Young's modulus of over 2 MPa.RASEI with these characteristics can accommodate large volume changes of lithium metal and en-sure the intimate contact between the lithium metal and the RASEI during battery operation.Consequently,it facilitated homogeneous lithium deposition while mitigating parasitic side reactions.Thanks to the tough and resilient nature of the fluorinated RASEI,the long-term cycling of Li‖Li symmetric cells can be achieved for over 500 h at 1 mA cm-2 and 1 mAh cm-2.The following post-mortem of cycled Li metal reveals that Li dendrite growth is effectively inhibited.Fur-thermore,the NCM811 pouch cell with a high cathode loading of 20 mg cm-2 exhibits a capacity retention of over 85％after 200 cycles at 1 C.

外文关键词：

lithium metal anodecarbonate electrolytesresilient ASEIhigh cathode loading

作者：

孔佳、侯添壹、石婷、李剑波、邓鑫、李顶根、黄云辉、许恒辉

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作者单位：

State Key Laboratory of Material Processing and Die & Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan,430074,China

关键词：

lithium metal anode carbonate electrolytes resilient ASEI high cathode loading

基金：

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaKey Program of the National Natural Science Foundation of ChinaFundamental Research Funds for the Central UniversitiesKey R&D Program of Hubei Province

项目编号：

2023YFB2503801523022535202780089522310092172020kfyXJJS0892023BAB028

出版年：

2024

DOI：

10.1007/s40843-024-2914-x

中国科学:材料科学(英文)

CSTPCD

ISSN：

年,卷(期)：2024.67(5)