Dual Interlocked Mediators Enable Single‑Ion‑Conducting Quasi‑Solid‑State Electrolytes for Ultrafast‑Charging Long‑Life Sodium Metal Batteries (IMAGE)
Caption
- Single-ion conduction. Sn-FB quasi-solid-state electrolytes (QSEs) achieves near-unity Na+ transference number (0.94) and high conductivity (1.3 mS cm–1) via synergistic Sn2+ initiated polymerization and difluoro(oxalato)borate (DFOB⁻) retardation.
- Highly adaptable bilateral interphases. Sn2+ was reduced to form a hybrid NaSn alloy/inorganic-rich solid-electrolyte interphase to homogenize electric fields, while DFOB– was oxidized to form robust, yet thin cathode–electrolyte interphase for rapid interfacial kinetics.
- Superior electrochemical performances. Sn-FB QSE delivers 6000 h stability without dendrite and retains 90% capacity after 2000 cycles at 3C.
Credit
Yuan Zhang, Long Pan*, Cheong Wa Leong, Xing-Guo Qi, Xiaozhong Huang, Xinyi Cai, Mufan Cao, Min Gao, Haoyu Zhang, Dawei Sha, Yang Zhou*, ZhengMing Sun*.
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License
CC BY-NC-ND