期刊
ELECTROCHIMICA ACTA
卷 421, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2022.140472
关键词
Fluorinated electrolyte; Interface; High voltage; Ion-solvent interaction; Lithium ion battery
资金
- National Natural Science Foundation of China [51604221, 51704222]
- Key Project of Natural Science Basic Research Plan of Shaanxi Province [2022JZ-25]
- Key Innovation Team of Shaanxi Province [2014KCT-04]
A series of designed fluorinated electrolytes were developed, which greatly improved the performance of high-voltage lithium second batteries. The electrolytes enhanced the reversible capacity, cycle and rate performance of the batteries by improving durability, suppressing parasitic reactions and preventing anode corrosion.
A series of designed fluorinated electrolytes with single or multiple fluorinated solvents were developed for the application of high-voltage lithium second batteries. The synergistic effect of various fluorinated solvents evidently enhance the reversible capacity, cycle and rate performance of the LiNi0.5Mn1.5O4 (LNMO)/Li cell, profitted from superior durability of the electrolyte to resist oxidation (despite weakened ionic conductivity), successful surface modification on the LNMO cathode to suppress parasitic reaction, and improved Li metal compatibility to aviod anode corrosion. Theoretical calculation results reveal that the competitive coordination among different solvents inevitably regulates the solvation structure of Li ion, redox capability of the electrolyte and then interfacial chemistry on both electrodes.
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