期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 30, 页码 25744-25753出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b05125
关键词
lithium bis(oxalato)borate; sulfolane; electric double layer; solid electrolyte interphase; density functional theory
资金
- Natural Science Foundation of China [51502124, 21766017]
- Science and Technology Project of Baiyin City [2017-2-11G]
Electrolytes based on sulfolane (SL) solvents and lithium bis(oxalato)borate (LiBOB) chelato-borate complexes have been reported many times for use in advanced lithium-ion batteries due to their many advantages. This study aims to clarify the active mechanism of the interphase film-forming process to optimize the properties of these batteries by experimental analysis and theoretical calculations. The results indicate that the self-repairing film-forming process during the first cycle is divided into three stages: the initial film formation with an electric field force of similar to 1.80 V, the further growth of the preformation solid electrolyte interphase (SEI) film at similar to 1.73 V, and the final formation of a complete SEI film at a potential below 0.7 V. Additionally, we can deduce that the decomposition of LiBOB and SL occurs throughout nearly the entire process of the formation of the SEI film. The decomposition product of BOB- anions tends to form films with an irregular structure, whereas the decomposition product of SL is in favor of the formation of a uniform SEI film.
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