Unusual Capacity Boost in Li/TiF 3 Cells Enabled by a Li + /Na + Mixed Solid Electrolyte with High-Voltage Stability

Key Points

• The research investigates the enhanced capacity of Li/TiF₃ cells when using a Li⁺/Na⁺ mixed solid electrolyte.
• Utilized a Li⁺/Na⁺ mixed NaI–NaBH₄–LiI electrolyte
• Examined interfacial Li⁺ storage mechanisms
• Assessed high-voltage stability
• TiF₃ displayed an unusually large capacity during tests
• No Ti³⁺ redox activity was observed, indicating different storage mechanisms
• Dominant process identified as interfacial Li⁺ storage