Nitrogen-Doped Graphene-Buffered Mn2 O3 Nanocomposite Anodes for Fast Charging and High Discharge Capacity Lithium-Ion Batteries.

Abstract

Mn2 O3 is a promising anode material for lithium-ion batteries (LIBs) because of its high theoretical capacity and low discharge potential. However, low electronic conductivity and capacity fading limits its practical application. In this work, Mn2 O3 with 1D nanowire geometry is synthesized in neutral aqueous solutions by a facile and effective hydrothermal strategy for the first time, and then Mn2 O3 nanoparticle and nitrogen-doped reduced graphene oxide (N-rGO) are composited with Mn2 O3 nanowires (Mn2 O3 -GNCs) to enhance its volume utilization and conductivity. When used as an anode material for LIBs, the Mn2 O3 -GNCs exhibit high reversible capacity (1350 mAh g-1 ), stable cycling stability, and good rate capability. Surprisingly, the Mn2 O3 -GNC electrodes can also show fast charging capability; even after 200 cycles (charge: 10 A g-1 ; discharge: 0.5 A g-1 ), its discharge capacity can also keep at ≈500 mAh g-1 . In addition, the Mn2 O3 -GNCs also have considerable full cell and supercapacitor performance. The excellent electrochemical performances can be ascribed to the N-rGO network structure and 1D nanowire structure, which can ensure fast ion and electron transportation.