Fluorinating the Solid Electrolyte Interphase by Rational Molecular Design for Practical Lithium-Metal Batteries

被引:117
作者
Xie, Jin [1 ]
Sun, Shu-Yu [1 ]
Chen, Xiang [1 ]
Hou, Li-Peng [1 ]
Li, Bo-Quan [2 ]
Peng, Hong-Jie [3 ]
Huang, Jia-Qi [2 ]
Zhang, Xue-Qiang [2 ]
Zhang, Qiang [1 ]
机构
[1] Tsinghua Univ, Dept Chem Engn, Beijing Key Lab Green Chem React Engn & Technol, Beijing 100084, Peoples R China
[2] Beijing Inst Technol, Adv Res Inst Multidisciplinary Sci, Beijing 100081, Peoples R China
[3] Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 611731, Sichuan, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Fluorinated Electrolytes; Fluorinated Solid Electrolyte Interphase; Lithium-Metal Batteries; Molecular Design; Pouch Cells; HIGH-ENERGY-DENSITY; SULFUR BATTERIES; RECHARGEABLE LITHIUM; PERFORMANCE; ANODE; CHALLENGES; SOLVENTS; CATHODES; PROGRESS; LIF;
D O I
10.1002/anie.202204776
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The lifespan of practical lithium (Li)-metal batteries is severely hindered by the instability of Li-metal anodes. Fluorinated solid electrolyte interphase (SEI) emerges as a promising strategy to improve the stability of Li-metal anodes. The rational design of fluorinated molecules is pivotal to construct fluorinated SEI. Herein, design principles of fluorinated molecules are proposed. Fluoroalkyl (-CF2CF2-) is selected as an enriched F reservoir and the defluorination of the C-F bond is driven by leaving groups on beta-sites. An activated fluoroalkyl molecule (AFA), 2,2,3,3-tetrafluorobutane-1,4-diol dinitrate is unprecedentedly proposed to render fast and complete defluorination and generate uniform fluorinated SEI on Li-metal anodes. In Li-sulfur (Li-S) batteries under practical conditions, the fluorinated SEI constructed by AFA undergoes 183 cycles, which is three times the SEI formed by LiNO3. Furthermore, a Li-S pouch cell of 360 Wh kg(-1) delivers 25 cycles with AFA. This work demonstrates rational molecular design principles of fluorinated molecules to construct fluorinated SEI for practical Li-metal batteries.
引用
收藏
页数:8
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