A robust solid electrolyte interphase layer coated on polyethylene separator surface induced by Ge interlayer for stable Li-metal batteries

Chuang Yue, Seho Sun, Minchul Jang, Eunkyung Park, Byoungkuk Son, Hyunsu Son, Zhiming Liu, Donghai Wang, Ungyu Paik, Taeseup Song

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Lithium (Li) dendrite growth and poor Coulombic efficiency (CE) lead to a safety issue and inferior electrochemical properties, which are the major obstacles that circumvent high energy density Li metal battery (LMB) development in practical applications. Here, it is demonstrated that the Ge interlayer deposited on commercial polyethylene (PE) separator (Ge@polyethylene, Ge@PE) spontaneously induces the formation of a pleated solid electrolyte interphase (SEI) layer, which can effectively prevent the isolated Li dendrites formation and propagation during cycling. The optimized Ge@PE configuration enables obvious improvement in Li plating/stripping behavior in Li||Ge@PE|| Cu battery due to the robust and efficient SEI layer. Impressively, the Li||Ge@PE||LCO(LiCoO2) full battery also endows enhanced electrochemical cyclability and exhibits Li dendrite-free generation during the repeated Li plating/stripping process. Our strategy could open an alternative way to optimize high performance LMB or other efficient Li metal based energy storage systems.

Original languageEnglish
Article number137703
JournalElectrochimica Acta
Volume370
DOIs
StatePublished - 2021 Feb 20

Keywords

  • Ge interlayer
  • Li metal battery
  • PE separator
  • SEI
  • stability

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