Room-Temperature All-Solid-State Sodium Battery Based on Bulk Interfacial Superionic Conductor
Chenji Hu, Jizhen Qi, Yixiao Zhang, Sijie Xie, Baotong Liu, Guoyong Xue, Daiqian Chen, Qinfeng Zheng, Ping Li, Shou‐Hang Bo, Yanbin Shen, Liwei Chen
Abstract
All-solid-state sodium batteries (ASSSBs) are attractive alternatives to lithium-ion batteries for grid-scale energy storage due to their high safety and ubiquitous distribution of Na sources. A critical component for ASSSB is sodium-ion conducting solid-state electrolyte (SSE). Here, we report a high-performance sodium-ion SSE with the recently developed bulk interfacial superionic conductor (BISC) concept. The ionic conductivity and areal conductance of the Na+ BISC at 25 °C reaches 6.5 × 10–4 S cm–1 and 260 mS cm–2, respectively. Using NaxCo0.7Mn0.3O2 (x ≈ 1.0, NaCMO) as the cathode active material, all-solid-state Na||NaCMO batteries exhibiting small overpotential and ∼180 cycle life are demonstrated under room temperature. This approach may also be used to prepare other metal ion, such as Mg2+, Al3+, and K+, based all-solid-state batteries.