Fabrication of the Oxygen Vacancy Amorphous MnO<sub>2</sub>/Carbon Nanotube as Cathode for Advanced Aqueous Zinc‐Ion Batteries
Hao Tong, Tingting Li, Jiang Liu, Daxiong Gong, Jinpan Xiao, Laifa Shen, Bing Ding, Xiaogang Zhang
Abstract
The serious limitations of MnO 2 are poor electrical conductivity and low utilization rate of electrochemical active area. These problems have seriously limited the application of MnO 2 aqueous zinc‐ion batteries (AZIBs). Herein, preparing MnO 2 uniformly loaded on carbon nanotubes with good electrical conductivity can greatly improve the poor electrical conductivity of MnO 2 . Moreover, by introducing oxygen vacancy, the surface capacitance, the reaction kinetics, and the electrochemical performance of MnO 2 is increased. The specific capacity of the V o ‐MnO 2 /CNT material is 314 mAh g −1 , at 0.2 A g −1 , and capacity retention of 81% is achieved after 1000 cycles. In particular, the prepared device presents a distinct energy density of 416.2 Wh kg −1 . As a result, the capacity as well as the cycle stability is effectively improved compared with the original MnO 2 .