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

Liu, Sufu; Xia, Jiale; Zhang, Weiran; Wan, Hongli; Zhang, Jiaxun; Xu, Jijian; Rao, Jiancun; Deng, Tao; Hou, Singyuk; Nan, Bo; Wang, Chunsheng

doi:10.1002/ange.202210522

Title: Salt‐in‐Salt Reinforced Carbonate Electrolyte for Li Metal Batteries

Journal Article · 20 September 2022 · Angewandte Chemie

DOI: https://doi.org/10.1002/ange.202210522 · OSTI ID:1888585

Liu, Sufu ^[1]; Xia, Jiale ^[1]; Zhang, Weiran ^[2]; Wan, Hongli ^[1]; Zhang, Jiaxun ^[1]; Xu, Jijian ^[1]; Rao, Jiancun ^[3]; Deng, Tao ^[1]; Hou, Singyuk ^[1]; Nan, Bo ^[1];

^[1]

Department of Chemical and Biomolecular Engineering University of Maryland College Park MD 20740 USA
Department of Materials Science and Engineering University of Maryland College Park MD 20740 USA
Maryland Nanocenter University of Maryland College Park MD 20740 USA

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 LiNO ₃ 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 NO ₃ ⁻ and PF ₆ ⁻ 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 LiNO ₃ solubility by divalent salts is universal, which will also inspire the electrolyte design for other metal batteries.

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Sponsoring Organization:: USDOE

OSTI ID:: 1888585

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 43 Vol. 134; ISSN 0044-8249

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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