Efficient nanoarchitectonics of solid-electrolyte-interface for high-performance all-solid-state lithium metal batteries via mild fluorination on polyethylene oxide

Jieqing Shen, Shuohan Liu, Dongyu Bian, Zhixin Chen, Hui Pan*, Cheng Yang, Wensheng Tian, Yao Li, Lingti Kong, Hengdao Quan, Da Wei Wang, Shenmin Zhu

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

9 引用 (Scopus)

摘要

Polyethylene oxide (PEO) based polymer electrolytes is promising for all-solid-state lithium metal batteries (ASSLMBs). Solid-electrolyte-interface (SEI) layer formed between polymer electrolytes and lithium metal is crucial to inhibit lithium dendrites growth. Herein, mild fluorination on commercial PEO is engineered as an electrolyte for ASSLMBs, which shows an outstanding cycling stability. During this process, some C-H bonds in PEO chains are substituted with C-F bonds, resulting in the formation of fluorinated PEO (F-PEO) with a low fluorine content of 2.7 at.%. Fluorination alters the regularity of PEO chains, leading to an improved ion conductivity for F-PEO/LiTFSI. An unusual and stable SEI containing relatively high LiF content forms, which can inhibit lithium dendrites growth and boost the battery performance. Li/Li cell with F-PEO/LiTFSI delivers outstanding cycling stability over 2000 h at 0.1 mA cm-2. When matching with LiFePO4 cathode, the battery exhibits high capacity of 151.0 mAh g−1 and good cycling stability for 500 cycles (0.05% decay per cycle) at 0.5 C. Even at 1.0 C, the capacity of the battery keeps at 99.8 mAh g−1 after 900 cycles. This facile and low-cost strategy opens an avenue for ASSLMBs towards their commercial applications.

源语言英语
文章编号142482
期刊Electrochimica Acta
456
DOI
出版状态已出版 - 10 7月 2023

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