MnO Stabilized in Carbon‐Veiled Multivariate Manganese Oxides as High‐Performance Cathode Material for Aqueous Zn‐Ion Batteries
Wanwei Jiang, Haiting Shi, Xijun Xu, Jiadong Shen, Zhiwei Xu, Renzong Hu
Abstract
Aqueous Zn‐ion battery has emerged as one of the most prospective energy storage devices due to its low cost, high safety, and eco‐friendliness. However, Zn‐ion batteries are bottlenecked by significant capacity fading during long‐term cycling and poor performance at high current rates. Here, we report an available cooperation of multivariate manganese oxides@carbon hybrids (MnO 2 /MnO@C and MnO 2 /Mn 3 O 4 @C) via a plasma‐assisted design as an attractive Zn‐ion cathode. Among them, the MnO 2 /MnO@C cathode exhibits a reversible specific capacity of 165 mAh g −1 over 200 cycles at a high rate of 0.5 A g −1 , and possesses great rate performance with high capacities of 110 and 100 mAh g −1 at a high rate of 0.8 and 1 A g −1 , respectively. The good cathode performance significantly results from the facile charge transfer and ions (Zn 2+ and H + ) insertion in the manganese oxides/carbon hybrids featuring phase stability behavior in the available cooperation of multivalence and carbon conductive substrates. This work will promote the Zn‐manganese dioxide system for the design of low‐cost and high‐performance aqueous rechargeable Zn‐ion batteries.