Ultralong Layered NaCrO2 Nanowires: A Competitive Wide-Temperature-Operating Cathode for Extraordinary High-Rate Sodium-Ion Batteries

The development of high-rate cathodes particularly with remarkable wide-temperature-tolerance sodium-storage capability plays a significant role in commercial applications of sodium-ion batteries (SIBs). Herein, we devise a scaled-up electrospinning avenue to fabricate nanocrystal-constructed ultralong layered NaCrO2 nanowires (NWs) toward SIBs as a wide-temperature-operating cathode. The resultant one-dimensional (1D) NaCrO2 nanoarchitecture is endowed with orientated and shortened electronic/ionic transport and remarkable structural tolerance to stress change over sodiation-desodiation processes. Benefiting from these structural superiorities, the NaCrO2 NWs are featured with prominent Na+-storage behaviors in the wide-operating-temperature range from -15 to 55 degrees C. Promisingly, the NaCrO2 NWs exhibit extraordinary high-rate capacities of similar to 108.8 and similar to 87.2 mAh g(-1) at 10 and 50 C rates at 25 degrees C, and even 94.6 (55 degrees C) and similar to 60.1 (-15 degrees C) mAh g(-1) at 10 C, along with outstanding cyclic stabilities with capacity retentions of similar to 80.6% (-15 degrees C), 88.4% (25 degrees C), and similar to 86.9% (55 degrees C). The overall performance of our NaCrO2 is superior to other reported NaCrO2-based cathodes, even with conductive nanocarbon coating. Encouragingly, a competitive energy density of similar to 161 Wh kg(-1) can be obtained by the NaCrO2 NWs-based full cell. Therefore, our NaCrO2 NWs can be highly anticipated as advanced cathode for commercial wide-temperature-tolerance SIBs.