Five-volt-class high-capacity all-solid-state lithium batteries

Key Contributions

• Demonstrates all-solid-state lithium batteries operating above 5V, a voltage class previously inaccessible to solid-state designs
• Achieves record areal capacity of 35.3 mAh/cm² — substantially higher than typical solid-state cells
• Introduces fluoride solid electrolyte LiCl–4Li₂TiF₆ with wide electrochemical stability window
• Fluoride electrolyte enables pairing with high-voltage cathodes that would decompose conventional sulfide or oxide electrolytes

Results / Data

• Operating voltage: >5V class
• Areal capacity: 35.3 mAh/cm²
• Electrolyte: LiCl–4Li₂TiF₆ (fluoride-based)
• Opens pathway to high-voltage, high-capacity solid-state architectures beyond sulfide and oxide families

Source: Five-volt-class high-capacity all-solid-state lithium batteries — Nature Energy, 2025