Self-assembly formation of solid-electrolyte interphase in gel polymer electrolytes for high performance lithium metal batteries

Yu Hsing Lin, Liang Ting Wu, Yu Ting Zhan, Jyh Chiang Jiang, Yuh Lang Lee, Jeng Shiung Jan, Hsisheng Teng

研究成果: Article同行評審

11 引文 斯高帕斯(Scopus)

摘要

Lithium-metal batteries (LMBs) using limited-Li anodes are imperative for realizing high-energy storage. Proper solid-electrolyte interphase (SEI) design to control Li-deposition behavior and enhance deposition reversibility is challenging. We engineer the self-assembly formation of SEI in a gel polymer electrolyte (GPE) comprising poly(vinylidene fluoride-co-hexafluoro propylene) (PVDF-co-HFP) dissolved in a LiPF6-LiNO3 dual-salt solution with multiple solvents. The components of this GPE present critical functions: (1) dielectric (PVDF‐co-HFP) dissociates ion pairs to facilitate Li+ transport in the electrolyte and regulate Li+ diffusion in the SEI to lower Li deposition overpotentials, and endows soft characteristics to the SEI; (2) dual-anion PF6 -NO3 in the Li+ solvation sheath facilitates facile Li+ desolvation and formation of rigid and ion-conductive Li3N–LiF-rich SEI. This GPE exhibits higher ionic conductivity and Li+ transference number than the corresponding liquid electrolytes. The capacity retention of an anode-free Cu|GPE|NMC811 battery, i.e., at an anodic-to-cathodic Li ratio (A/C) of 0, reaches 44% after 100 charge-discharge cycles. An LMB with limited-Li at A/C = 2, having energy of 616 Wh kg−1 based on electrode-material mass, exhibits a retention of 85% after 100 cycles. The strategy to regulate Li+-transport and Li-deposition through GPE is promising for realizing the application of LMBs.

原文English
文章編號102868
期刊Energy Storage Materials
61
DOIs
出版狀態Published - 2023 8月

All Science Journal Classification (ASJC) codes

  • 可再生能源、永續發展與環境
  • 一般材料科學
  • 能源工程與電力技術

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