Construction of Lithium-Rich Manganese-Based Cathodes Based on Activated Manganese Dioxide for Enhanced Energy Storage Performances

摘要

Herein, highly active manganese dioxide is prepared by roasting-disproportionation treatment to fabricate a lithium-rich manganese-based cathode (Li_(1.6)Mn_(0.6)Ni_(0.3)Co_(0.1)O_(2.6)) for enhanced charge/discharge capacity performance. The findings display that the roasting temperature and subsequent disproportionation degree significantly affect crystalline structure of manganese dioxide, thereby apparently improving the electrochemical performances of lithium-rich manganese-based cathodes. When the roasting temperature is 600 ℃, the content of α-MnO_2 reaches to 69.3% in lithium-rich manganese-based cathode, resulting in the best electrochemical activity. The prepared lithium-rich cathode material displays a discharge capacity of 243 mAh/g after 100 cycles at 0.2 C, and 155 mAh/g at 3 C, which shows good multiplicative performance.