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 mAhg(-1) over 250 cycles at 1Ag(-1), 1564.9mAhg(-1) after 500 cycles at 5A(-1), and 475.6mAhg(-1) at 15Ag(-1).