A trade-off-free fluorosulfate-based flame-retardant electrolyte additive for high-energy lithium batteries. Issue 41 (5th October 2022)

• Record Type: Journal Article
• Authors: Oh, Jimin; Lee, Ho Seung; Kim, Min Pyeong; Lee, Young-Gi; Hong, Sung You; Kim, Kwang Man
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 41(2022)
• Page Start: 21933
• Page End: 21940
• Publication Date: 2022-10-05
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta05854e
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A synthetic additive bearing fluorosulfate moieties allows a high thermal stability for organocarbonate electrolyte in high-capacity lithium batteries without showing the performance trade-off behavior. 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 LiNi0.9 Co0.05 Mn0.05 O2 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.