A High‐Rate and Long‐Life Rechargeable Battery Operated at −75 oC

Abstract Intercalation compounds are commonly‐used electrodes for commercialized lithium ion batteries (LIBs), while suffering from the sluggish interfacial processes at subzero temperature. Herein, nanoscale Nb 2 O 5 has been investigated as a viable cathode for rechargeable batteries operated at the temperature of as low as −75 °C. Benefitting from the surface‐controlled charge storage process, the intrinsic intercalation pseudocapacitance of Nb 2 O 5 broke the rate limitation at low temperature. Particularly, the battery exhibited outstanding rate performance (100 C) at room temperature and delivered high a reversible charge/discharge with a high capacity of 121 mAh g −1 at −75 °C. Furthermore, a capacity retention of 50 % and a long life for 100 cycles without capacity fading were achieved with a rate of 0.5 C at such low temperature. Based on the outstanding electrochemical performance from −75 °C to +25 °C, it can be envisaged that materials with intercalation pseudocapacitive behavior could be served as good candidate for energy storage systems under extreme conditions.