Salt-in-Salt Reinforced Carbonate Electrolyte for Li Metal Batteries

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Sufu Liu
  • Jiale Xia
  • Weiran Zhang
  • Hongli Wan
  • Jiaxun Zhang
  • Jiancun Rao
  • Tao Deng
  • Singyuk Hou
  • Bo Nan
  • Chunsheng Wang

Detail(s)

Original languageEnglish
Article numbere202210522
Journal / PublicationAngewandte Chemie - International Edition
Volume61
Issue number43
Online published30 Aug 2022
Publication statusPublished - 24 Oct 2022
Externally publishedYes

Abstract

The instability of carbonate electrolyte with metallic Li greatly limits its application in high-voltage Li metal batteries. Here, a “salt-in-salt” strategy is applied to boost the LiNO3 solubility in the carbonate electrolyte with Mg(TFSI)2 carrier, which enables the inorganic-rich solid electrolyte interphase (SEI) for excellent Li metal anode performance and also maintains the cathode stability. In the designed electrolyte, both NO3 and PF6 anions participate in the Li+-solvent complexes, thus promoting the formation of inorganic-rich SEI. Our designed electrolyte has achieved a superior Li CE of 99.7 %, enabling the high-loading NCM811||Li (4.5 mAh cm−2) full cell with N/P ratio of 1.92 to achieve 84.6 % capacity retention after 200 cycles. The enhancement of LiNO3 solubility by divalent salts is universal, which will also inspire the electrolyte design for other metal batteries. © 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.

Research Area(s)

  • Carbonate Electrolyte, Dendrite-Free, Inorganic Interphase, Lithium Metal Batteries, Salt in Salt

Citation Format(s)

Salt-in-Salt Reinforced Carbonate Electrolyte for Li Metal Batteries. / Liu, Sufu; Xia, Jiale; Zhang, Weiran et al.
In: Angewandte Chemie - International Edition, Vol. 61, No. 43, e202210522, 24.10.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review