4.7 Article

Nonflammable Dual-Salt Electrolytes for Graphite/ LiNi0.8Co0.1Mn0.1O2 Lithium-Ion Batteries: Li+ Solvation Structure and Electrode/Eelectrolyte Interphase

期刊

ACS APPLIED ENERGY MATERIALS
卷 5, 期 12, 页码 15491-15501

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c03065

关键词

nonflammable electrolyte; Li+ solvation structure; electrode; electrolyte interphase; thermodynamics; kinetics

资金

  1. Intergovernmental International Science and Technology Innovation Cooperation Project
  2. National Natural Science Foundation of China
  3. 21C Innovation Laboratory, Contemporary Amperex Tech-nology Ltd
  4. [2019YFE0100200]
  5. [22179101]
  6. [21C-OP-202202]

向作者/读者索取更多资源

In this study, a nonflammable electrolyte was designed for lithium-ion batteries, which achieve high performance and stable cycling through modulation of Li+ solvation structure. Furthermore, a dual-salt strategy was proposed to enhance the performance of the battery, and the functions and relationship of Li+ solvation structure and electrode/electrolyte interphase were elucidated.
Trimethyl phosphate (TMP) is the most promising safe solvent for lithium-ion battery (LIB) electrolyte because of the nonflammability, oxidation stability, and low cost, but its application is hindered by incompatibility with the graphite anode. Herein, nonflammable electrolytes with ordinary concentration (1 mol L-1) are designed for graphite/LiNi0.8Co0.1Mn0.1O2 (Gr/NCM811) LIBs with TMP/2,2,2-trifluoroethyl methyl carbonate (FEMC) binary solvents. Stable cycling of the Li/Gr half cells with high capacity is achieved via modulation of the Li+ solvation structure. A dual-salt strategy of lithium hexafluorophosphate/lithium difluoro(oxalato)borate is further used to realize the high performance of the Gr/ NCM811 full cells. More significantly, the functions and relationship of Li+ solvation structure and electrode/electrolyte interphase are elucidated. Li+ solvation structure and interphase are respectively the thermodynamic and kinetic factors for the side reactions of the electrolyte occurring at the electrode/electrolyte interphase, which should be considered comprehensively in the design of electrolytes for high-energy density LIBs.

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