Zhongke Nanjing Institute of Green Manufacturing Industry, Nanjing, Jiangsu 211135, P. R. China.
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China.
ACS Appl Mater Interfaces. 2023 Jun 14;15(23):28044-28054. doi: 10.1021/acsami.3c03437. Epub 2023 Jun 2.
Research on zinc-ion batteries (ZIBs) with manganese-based cathodes has been severely hindered by their poor cycle stability. This study explores the fundamental parameters that affect the cycle stability of battery systems from a structural stability perspective. MnO electrodes with different classical morphologies and sizes were synthesized via a temperature-controlled coprecipitation strategy. The effects of the morphology and size of the MnO on the overall electrical properties and kinetics of ZIBs were analyzed and compared. The one-dimensional nanofibrous α-MnO produced using this method exhibited the most stable nanostructure with a favorable aspect ratio, which resulted in faster chemical kinetics. A more uniform particle distribution and better aspect ratios not only enabled a faster ion migration rate but also affected the remolding of the anode morphology. After 2000 cycles at a high current density of 1 A g, the material maintained an excellent discharge-specific capacity, highlighting it as a promising electrode material for ZIBs. The construction of nanoenergy materials with controllable morphologies and sizes will significantly advance battery applications.
对基于锰的正极的锌离子电池（ZIBs）的研究受到其循环稳定性差的严重阻碍。本研究从结构稳定性的角度探讨了影响电池系统循环稳定性的基本参数。通过温度控制共沉淀策略合成了具有不同经典形态和尺寸的 MnO 电极。分析并比较了 MnO 的形态和尺寸对 ZIBs 整体电性能和动力学的影响。该方法制备的一维纳米纤维状α-MnO 表现出最稳定的纳米结构和有利的纵横比，从而实现更快的化学反应动力学。更均匀的颗粒分布和更好的纵横比不仅使离子迁移率更快，而且还影响了阳极形貌的重塑。在 1 A g 的高电流密度下循环 2000 次后，该材料保持了出色的放电比容量，表明其是 ZIBs 的一种有前途的电极材料。具有可控形态和尺寸的纳米能源材料的构建将极大地推动电池应用。
