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Title: Non‐Flammable Ester Electrolyte with Boosted Stability Against Li for High‐Performance Li Metal Batteries

Journal Article · · Angewandte Chemie
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [2];  [5]; ORCiD logo [1]
  1. School of Chemical Engineering &, Advanced Materials The University of Adelaide Adelaide SA 5005 Australia, Institute for Superconducting &, Electronic Materials Australian Institute for Innovative Materials University of Wollongong Wollongong NSW 2522 Australia
  2. School of Chemical Engineering &, Advanced Materials The University of Adelaide Adelaide SA 5005 Australia
  3. Shenzhen Key Laboratory on Power Battery Safety and Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 China
  4. Molecular Horizons and School of Chemistry and Molecular Bioscience Illawarra Health and Medical Research Institute University of Wollongong Wollongong NSW 2522 Australia
  5. Argonne National Laboratory Lemont IL 60439 USA

Abstract In traditional non‐flammable electrolytes a trade‐off always exists between non‐flammability and battery performance. Previous research focused on reducing free solvents and forming anion‐derived solid‐electrolyte interphase. However, the contribution of solvated anions in boosting the stability of electrolyte has been overlooked. Here, we resolve this via introducing anions into Li + solvation sheaths using anions with similar Gutmann donor number (DN) to that of solvents. Taking trimethyl phosphate fire‐retardant (DN=23.0 kcal mol −1 ) and NO 3 (DN=22.2 kcal mol −1 ) as an example, NO 3 is readily involved in the Li + solvation sheath and reduces the polarity of solvent. This results in boosted stability of electrolyte against Li. The developed non‐flammable electrolyte has low viscosity, high ionic conductivity and is low cost. The reversibility of Li‐Cu cell was improved to 99.49 % and the lifespan of practical LMBs was extended by >100 %.

Sponsoring Organization:
USDOE
OSTI ID:
1885495
Alternate ID(s):
OSTI ID: 1890576
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 134 Journal Issue: 41; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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