A durable P2-type layered oxide cathode with superior low-temperature performance for sodium-ion batteries

To power large-scale energy storage systems, sodium-ion batteries (SIBs) must have not only high-energy density but also high performance under a low-temperature (LT) environment. P2-type manganese oxides with specific capacity are promising cathode candidates for SIBs, their LT applications limitedly explored. We proposed Na0.67Ni0.1Co0.1Mn0.8O2 material outstanding prepared through reasonable structure modulation. The offers an excellent Na+ diffusion coefficient (approximately 10?9–10?7.5 cm2 s?1) at ?20°C, superior discharge of 147.4 mA h g?1 in the Na half-cell system, and full cell (energy 358.3 W kg?1). Various characterisations function theory calculations results show that solid solution reaction pseudocapacitive feature promote desolvation from bulk electrode to interface, finally achieving electrochemical LT.