High-energy and fast-charging lithium metal batteries enabled by tuning Li+-solvation via electron-withdrawing and lithiophobicity functionality

The solvent fluorination almost always improves electrochemical stability of electrolytes against both lithium anodes and high-voltage cathodes in lithium metal batteries. However, how exactly fluorination affects Li+-solvation and interphasial chemistries remains unclear, hindering rational design of electrolytes and interphases with both wide electrochemical stability window and fast ion transport kinetics that are required for energy-dense and fast-charging LMBs. Here we introduce the trifluoromethylation (-CF3) at one end of 1,2-dimethoxyethane and generate 1,1,1-trifluoro-2-(2-methoxyethoxy) ethane, which as a single solvent of electrolyte simultaneously meets energy-dense and fast-charging requirements…

• NN
  National Natural Science Foundation of China

  Awards: 22371116, 22305115
• NS
  Natural Science Foundation of Guangdong Province

  Award: 2023A1515010686
• BA
  Basic and Applied Basic Research Foundation of Guangdong Province

  Award: 2023A1515010985