Pseudocapacitance-Enhanced High-Rate Lithium Storage in "Honeycomb"-like Mn sub(2)O sub(3) 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 Mn sub(2)O sub(3) 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 Mn sub(2)O sub(3) can reach 1584.9mAhg super(-1) over 250 cycles at 1Ag super(-1), 1564.9mAhg super(-1) after 500 cycles at 5A super(-1), and 475.6mAhg super(-1) at 15Ag super(-1). Sweet success! "Honeycomb"-like Mn sub(2)O sub(3) films are successfully demonstrated as anodes for lithium-ion batteries. The three-dimensional porous structure can accommodate aggregation and volume changes, as well as increase ionic/electrical conductivity for the electrode. Benefitting from the unique porous structure, the pseudocapacitive effect is strengthened by cycle-induced microstructure evolution, yielding excellent cycling performance and superior rate capability as anode materials for lithium storage.