MnO2 cathode materials with high reversible stability through Li intercalating for aqueous zinc ion battery

Abstract

Manganese oxides have been paid attention to storage energy with low price, high safety and environmentally friendly. Nevertheless, poorly cycling stability and low structure stability restrict their appliance. The metal doping is a potential method to enhance their electrochemical performance. Herein, a new strategy was proposed to optimize the cycling stability and rate performance of the pristine MnO2 by the simple lithium doped. The Li-doped MnO2 (Li-MnO2) not only relieved the manganese dissolution during charge-discharge process but also introduced oxygen defects boosting the electrochemical kinetics of MnO2. The prepared composite delivers a reversible specific capacity of 185 mAh g−1 at 0.1 A g−1 and 88 mAh g−1 at 1 A g−1, maintaining 88% of its initial capacity after 1000 cycles. This work may provide some new ideas for improving the stability of manganese-based zinc-ion batteries.