Solid-state lithium battery with garnet Li7La3Zr2O12 nanofibers composite polymer electrolytes

In recent years, solid-state lithium-ion batteries with high safety and excellent performance have become a research hotspot. Garnet Li 7 La 3 Zr 2 O 12 (LLZO) has been widely used in lithium-ion batteries because of its high ionic conductivity, wide electrochemical window, excellent thermal performance, and promising stability. In this study, Ga-LLZO was prepared by the electrospinning method and combined with PVDF-HFP to prepare a composite polymer electrolyte. The addition of 15 wt% Ga-LLZO nanofibers in the electrolyte improved the ionic conductivity, reaching 8.92 × 10 −4 S·cm −1 at room temperature. The electrochemical window for PVDF-HFP/LiTFSI/Ga-LLZO composite polymer electrolyte was 5.2 V vs Li/Li + . In addition, LiFePO 4 |PVDF-HFP/LiTFSI/Ga-LLZO|Li exhibited good cycling performance and rate capability. High-performance composite electrolyte films of ceramic nanofiber Ga-LLZO and polymer were successfully prepared for high-performance solid-state lithium batteries. • Ga-LLZO nanofibers were combined with polymer PVDF-HFP, which exhibited higher lithium ion conductivity, reaching 8.94 × 10 −4 S·cm −1 at room temperature. • The electrochemical window for PVDF-HFP/LiTFSI/Ga-LLZO composite polymer electrolyte was 5.2 V vs Li/Li + . • High-performance composite electrolyte films of ceramic nanofiber Ga-LLZO and polymer were successfully prepared for high-performance solid-state lithium batteries.