Synthetic poly-dioxolane as universal solid electrolyte interphase for stable lithium metal anodes  

作　　者：Tao Chen Haiping Wu Jing Wan Mengxue Li Yucheng Zhanga Lin Sun Yuncong Liu Lili Chen Rui Wen Chao Wang 

机构地区：[1]Department of Chemistry,Tsinghua University,Beijing 100084,China [2]Department of Battery Technology,BYD Shanghai Co.,Ltd.,Shanghai 201611,China [3]Key Laboratory of Molecular Nanostructure and Nanotechnology,CAS Research/Education Center for Excellence in Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences(CAS),Beijing 100190,China

出　　处：《Journal of Energy Chemistry》2021年第11期172-178,I0004,共8页能源化学（英文版）

基　　金：This research was supported financially by the Major Program of the National Natural Science Foundation of China(21890731).

摘　　要：Lithium (Li) metal is a promising anode for the next generation high-energy–density batteries. However, the growth of Li dendrites, low coulombic efficiency and dramatic volume change limit its development. Here, we report a new synthetic poly-dioxolane (PDOL) approach to constructing an artificial 'elastic' SEI to stabilize the Li/electrolyte interface and the Li deposition/dissolution behavior in a variety of electrolytes. By coating PDOL with optimized molecular weights and synthetic routes on Li metal anode, the 'elastic' SEI layer could be maintained on top of the Li metal anode to accommodate the Li deposition/dissolution. No dendrite formation was observed during the cycling process, and the interfacial side reactions were reduced significantly. Consequently, we successfully achieved 330 cycles with a CE of 98.4% in ether electrolytes and 90 cycles with a CE of 94.3% in carbonate electrolytes. Simultaneously, the Li-metal batteries with LiFePO_(4) as cathodes also exhibited improved cycling performance. This strategy could promote the development of dendrite-free metal anodes toward high-performance Li-metal batteries.

关 键 词：Polymer Lithium metal anodes Solid electrolyte interphase Lithium-ion batteries 

分 类 号：O631.5[理学—高分子化学] TM912[理学—化学]