Wang Yun, Wang Tengfei, Zhang Wenjing, Li Liangjun, Lv Xiaoxia, Wang Hua
Key Laboratory of Catalytic Conversion and Clean Energy in Universities of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong, P.R. China.
College of New Energy, China University of Petroleum (East China), Qingdao, Shandong Province, P. R. China.
Dalton Trans. 2024 Mar 19;53(12):5534-5543. doi: 10.1039/d4dt00044g.
Aqueous zinc ion batteries (AZIBs) are regarded as a promising alternative for energy storage due to their safety, cost-effectiveness and environmental friendliness. Manganese dioxide is considered a promising cathode material for energy storage because of its abundant reserves and high energy density. However, its inherent low electronic conductivity and limited cycling performance due to structural instability hinder its further development. Herein, a silver and manganese dioxide composite (Ag@MnO) enriched with oxygen vacancies was prepared by a simple liquid-phase reduction method. The introduction of silver particles facilitates the improvement of electrical conductivity, and the incorporation of oxygen vacancies helps change the surface properties of manganese dioxide, providing additional active sites for ion transport, enhancing the overall electrochemical kinetics, and further improving the battery performance. As a result, the Ag@MnO cathode exhibits an astonishingly high capacity of 353 mAh g at a current density of 0.1 A g and a capacity retention of 78% after 1500 cycles. Additionally, electrochemical and structural analyses have revealed that the Ag@MnO cathode undergoes a reversible and stable process of H and Zn insertion/extraction.
水系锌离子电池（AZIBs）因其安全性、成本效益和环境友好性而被视为一种有前途的储能替代方案。二氧化锰由于其储量丰富和能量密度高，被认为是一种有前途的储能阴极材料。然而，其固有的低电子导电性以及由于结构不稳定导致的有限循环性能阻碍了其进一步发展。在此，通过一种简单的液相还原法制备了富含氧空位的银-二氧化锰复合材料（Ag@MnO）。银颗粒的引入有助于提高电导率，氧空位的掺入有助于改变二氧化锰的表面性质，为离子传输提供额外的活性位点，增强整体电化学动力学，并进一步提高电池性能。结果，Ag@MnO阴极在0.1 A g的电流密度下表现出惊人的353 mAh g的高容量，并且在1500次循环后容量保持率为78%。此外，电化学和结构分析表明，Ag@MnO阴极经历了H和Zn插入/脱出的可逆且稳定的过程。
