Non-Flammable Ester Electrolyte with Boosted Stability Against Li for High-Performance Li metal Batteries

Publication Name

Angewandte Chemie - International Edition

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 NO3− (DN=22.2 kcal mol−1) as an example, NO3− 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 %.

Open Access Status

This publication is not available as open access

Funding Number

DE‐AC02‐06CH11357

Funding Sponsor

U.S. Department of Energy

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Link to publisher version (DOI)

http://dx.doi.org/10.1002/anie.202206682