Binary metal co-substituted P2-type Na0.67Mn0.7Cu0.15Ni0.15O2 microspheres as robust cathode for high-power sodium ion battery
By Ma, Ping; Kang, Wenpei; Wang, Yuyu; Cao, Dongwei; Fan, Lili; Sun, Daofeng
Published in Applied Surface Science
Applied Surface Science
2020
Abstract
Developing suitable cathode materials is essential to promote the development of sodium ion batteries (SIBs). In this work, Ni, Cu co-substituted P2-type Na0.67Mn0.7Cu0.15Ni0.15O2 microspheres are designed and synthesized through high temperature solid reaction using MnO2 template. Compared with pristine Na0.67MnO2, or monometal substituted Na0.67Mn0.7Ni0.3O2 and Na0.67Mn0.7Cu0.3O2, this binary metal co-substituted Na0.67Mn0.7Cu0.15Ni0.15O2 microsphere shows markedly enhanced electrochemical performance as cathode material for SIBs, especially for long-term cycling stability and high rate capability. For the rate capability measurements, when the current increases from 50 mA g?1 to high current of 2000 mA g?1 (40-folds increase), the capacity retention can be kept for 65.0%. And for the long-term cycling performance within 1000 cycles, a capacity of 74.1 mAh g?1 can be maintained in the voltage range of 2.0