Stable interfaces constructed by concentrated ether electrolytes to render robust lithium metal batteries

He Liu, Tao Li, Xiangqun Xu, Peng Shi, Xueqiang Zhang, Rui Xu, Xinbing Cheng, Jiaqi Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Lithium metal batteries (LMBs) are highly considered as promising candidates for next-generation energy storage systems. However, routine electrolytes cannot tolerate the high potential at cathodes and low potential at anodes simultaneously, leading to severe interfacial reactions. Herein, a highly concentrated electrolyte (HCE) region trapped in porous carbon coating layer is adopted to form a stable and highly conductive solid electrolyte interphase (SEI) on Li metal surface. The protected Li metal anode can potentially match the high-voltage cathode in ester electrolytes. Synergistically, this ingenious design promises high-voltage-resistant interfaces at cathodes and stable SEI with abundance of inorganic components at anodes simultaneously in high-voltage LMBs. The feasibility of this interface-regulation strategy is demonstrated in Li | LiFePO4 batteries, realizing a lifespan twice as long as the routine cells, with a huge capacity retention enhancement from 46.4% to 88.7% after 100 cycles. This contribution proof-of-concepts the emerging principles on the formation and regulation of stable electrode/electrolyte interfaces in the cathode and anode simultaneously towards the next-generation high-energy–density batteries.

Original languageEnglish
Pages (from-to)152-158
Number of pages7
JournalChinese Journal of Chemical Engineering
Volume37
DOIs
Publication statusPublished - Sept 2021

Keywords

  • Dendrite
  • Ester electrolyte
  • Highly concentrated ether electrolyte
  • Lithium metal anode
  • Solid electrolyte interphase

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