Modulating the D-band center of mn and mitigating O vacancies with amino groups for enhanced long-cycle alkaline-manganese batteries

Manganese oxide is a promising cathode material for rechargeable batteries due to its high theoretical specific capacity. However, its practical application is hindered by its poor conductivity and rapid capacity decay caused by Jahn-Teller distortion during charging and discharging. This work introduces Na2EDTA during the synthesis of MnO2, and the amino group is introduced by adsorption to deposit to form N-doped MnO2. Alkaline N-doped MnO2 battery upshifts the d-band center of Mn, improves the conductivity of MnO2 and the formation energy of O vacancies during the charge-discharge process, and suppresses Jahn Teller distortion. As a result, N-doped MnO2 achieves a high capacity of up to 197mAh g−1 and excellent capacity retention of 94.2% over 250 cycles with slower voltage decay. This strategy enables the material with high cycling performance for single-electron discharge secondary alkaline manganese batteries.