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A trade-off-free fluorosulfate-based flame-retardant electrolyte additive for high-energy lithium batteries
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- Authors
- Jimin Oh, Ho Seung Lee, Min Pyeong Kim, Young-Gi Lee, Sung You Hong, Kwang Man Kim
- Issue Date
- 2022-11
- Citation
- Journal of Materials Chemistry A, v.10, no.41, pp.21933-21940
- ISSN
- 2050-7488
- Publisher
- Royal Society of Chemistry (RSC)
- Language
- English
- Type
- Journal Article
- Abstract
- The flammability of organic electrolytes raises increasing safety concerns about the high-capacity batteries of next-generation electric vehicles and smart grid systems. Herein, we report a synthetic dual-functional electrolyte additive bearing two-fold fluorosulfate moieties, which allows flame retardancy without sacrificing battery performance. Electrochemical performance is measured using a high-capacity cell built with a Ni-rich LiNi0.9Co0.05Mn0.05O2 cathode and lithium metal anode. Compared with triphenyl phosphate as a known representative flame-retardant, the fluorosulfate-based electrolyte additive shows remarkable capacity retention, reduced interfacial resistance, and enhanced rate capability via the formation of a stable cathode solid electrolyte interfacial layer due to the inflammable sulfite-to-sulfate conversion mechanism.
- KSP Keywords
- Conversion mechanism, Electrochemical performance, Flame-retardant, Functional electrolyte, High-capacity, Lithium battery, Next-generation, Ni-rich, Solid electrolyte, Trade-off, Triphenyl phosphate(TPP)