期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 619, 期 -, 页码 399-406出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.03.133
关键词
Lithium-ion batteries; Ni-rich cathode; Fluorobenzene; Non-flammable electrolyte; Safety
资金
- National Natural Science Foun-dation of China [22008082, U1966214, 21975087, 51821005]
In this study, a non-flammable electrolyte with internal-external flame retardants is designed by introducing fluorobenzene as a cosolvent and bridge solvent in a high-concentration electrolyte system. This design successfully solves the safety concerns of lithium-ion batteries and achieves stable cycling.
Lithium-ion batteries with Ni-rich cathode and flammable carbonate electrolytes are breeding severe safety concerns which hinds their application in electric vehicles. Herein, by introducing the fluorobenzene (FB) with low-density and low-cost as a cosolvent and bridge solvents in triethyl phosphate (TEP)-based diluted high-concentration electrolytes (DHCEs) system, we design a non-flammable electrolyte with a special solvation structure containing internal-external flame retardants. This non-flammable electrolyte not only solves successfully the incompatibility problem of TEP-based electrolyte to the Li-metal anode (LMA) and the graphite (Gr) anode, but also ensures the stable cycling of Li||LiNi0.7Co0.1Mn0.2O2 (86% capacity retention after 120 cycles) and Gr||LiNi0.7Co0.1Mn0.2O2 (75% capacity retention after 200 cycles) full cells. Such design opens up a new window for developing new electrolyte systems and building safer high-energy-density batteries. (c) 2022 Elsevier Inc. All rights reserved.
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