Beyond LiF: Tailoring Li 2 O-Dominated Solid Electrolyte Interphase for Stable Lithium Metal Batteries

The components and structures of the solid-electrolyte interphase (SEI) are critical for stable cycling of lithium metal batteries (LMBs). LiF has been widely studied as the dominant component of SEI, but Li2O, which has a much lower diffusion barrier for Li+, has rarely been investigated as the dominant component of SEI. The effect of Li2O-dominated SEI on electrochemical performance still remains elusive. Herein, an ultrastrong coordinated cosolvation diluent, 2,3-difluoroethoxybenzene (DFEB), is designed to modulate solvation structure and tailor Li2O-dominated SEI for stable LMBs. In the DFEB-based LHCE (DFEB-LHCE), DFEB intensively participates in the first solvation shell and synergizes with FSI– to…

• NN
  National Natural Science Foundation of China

  Awards: 22078144, 22279051
• SA
  Science and Technology Planning Project of Guangdong Province

  Award: 2021A0505110001
• SP
  Special Project for Research and Development in Key areas of Guangdong Province

  Award: 2020B090919001
• SS
  Shenzhen Science and Technology Innovation Program

  Award: JCYJ20220530114408018
• BA
  Basic and Applied Basic Research Foundation of Guangdong Province

  Awards: 2023A1515010985, 2021A1515010138