Oxygen Defects in β-MnO2 Enabling High-Performance Rechargeable Aqueous Zinc/Manganese Dioxide Battery

作者：Mingming Han, Jiwu Huang, Shuquan Liang, Lutong Shan, Xuesong Xie, Zhenyu Yi, Yiren Wang, Shan Guo, Jiang Zhou · 发表于：iScience · 年份：2019 · DOI：10.1016/j.isci.2019.100797 · 被引用次数：288 · 研究领域：Advanced battery technologies research、Supercapacitor Materials and Fabrication、Advanced Battery Materials and Technologies

Rechargeable aqueous Zn/manganese dioxide (Zn/MnO 2 ) batteries are attractive energy storage technology owing to their merits of low cost, high safety, and environmental friendliness. However, the β -MnO 2 cathode is still plagued by the sluggish ion insertion kinetics due to the relatively narrow tunneled pathway. Furthermore, the energy storage mechanism is under debate as well. Here, β -MnO 2 cathode with enhanced ion insertion kinetics is introduced by the efficient oxygen defect engineering strategy. Density functional theory computations show that the β -MnO 2 host structure is more likely for H + insertion rather than Zn 2+ , and the introduction of oxygen defects will facilitate the insertion of H + into β -MnO 2 . This theoretical conjecture is confirmed by the capacity of 302 mA h g −1 and capacity retention of 94% after 300 cycles in the assembled aqueous Zn/ β -MnO 2 cell. These results highlight the potentials of defect engineering as a strategy of improving the electrochemical performance of β -MnO 2 in aqueous rechargeable batteries.