Dual Interlocked Mediators Enable Single-Ion-Conducting Quasi-Solid-State Electrolytes for Ultrafast-Charging Long-Life Sodium Metal Batteries
Yuan Zhang·ZhengMing Sun·Cheong Wa Leong·Xing-Guo Qi·Xiaozhong Huang·Xinyi Cai·Mufan Cao·Min Gao·Haoyu Zhang·Dawei Sha·Yang Zhou·Long Pan
Abstract Quasi-solid-state electrolytes (QSEs) are critical for ultrafast-charging yet high-safety sodium metal batteries (SMBs), yet their implementation is hindered by sluggish Na + transport in bulk and at interfaces. Here, we propose dual interlocked mediator engineering that transcends conventional independent approaches by coupling cationic Sn 2+ salt with anionic difluoro(oxalato)borate (DFOB⁻) salts to simultaneously regulating bulk ion transport and bilateral interface chemistry. During