Weakly Solvating Cyclic Ether Electrolyte for High-Voltage Lithium Metal Batteries

The commercialization of high-voltage lithium (Li) metal batteries (LMBs) has been severely hindered due to the lack of advanced electrolytes that can simultaneously support a stable lithium metal anode (LMA) and high-voltage cathode (>4 V vs Li+/Li). Here, we propose a tetrahydropyran (THP)-based weakly solvating electrolyte (WSE) to regulate Li+ solvation structures and interfacial behaviors. The anion-rich Li+ solvation in THP-based WSE effectively promotes the formation of inorganic-rich solid electrolyte interphase (SEI) layers, firm cathode electrolyte interphase (CEI) films, and protective passivation films on an Al current collector. The optimized interfacial behaviors contribute to the highly compact…

• NN
  National Natural Science Foundation of China

  Awards: U19A2019, 21771062, 22272205
• HP
  Hunan Provincial Science and Technology Department

  Award: 2021RC2006
• NS
  Natural Science Foundation of Guangxi Province

  Award: 2020GXNSFAA159015
• GS
  Guangdong Science and Technology Department

  Award: 2020B090919001
• ST
  Science, Technology and Innovation Commission of Shenzhen Municipality

  Award: 2021Szvup170
• CU
  Central University Basic Research Fund of China

  Award: 2020zzts057