Pseudocapacitance‐Enhanced High‐Rate Lithium Storage in “Honeycomb”‐like Mn2O3 Anodes

The realization of high‐power lithium‐ion batteries (LIBs) is heavily hampered by intrinsically slow lithium diffusion within solid electrodes. Capacitive‐like lithium storage behavior observed in transition‐metal oxide (TMO)‐based anodes shed light on attaining battery‐like capacity and supercapacitor‐like rate performance simultaneously. Herein, “honeycomb”‐like Mn2O3 films were successfully demonstrated as anodes for LIBs, in which the pseudocapacitive effect is strengthened upon cycling, resulting in a high‐rate lithium storage capability. Such pseudocapacitance originates from the unique porous structure and cycle‐induced microstructure evolution. The reticular Mn2O3 can reach 1584.9 mAh g−1 over 250 cycles at 1 A g−1, 1564.9 mAh g−1 after 500 cycles at 5 A −1, and 475.6 mAh g−1 at 15 A g−1.