二氧化钛涂层改性锌负极及其在水系锌离子电池中的应用

采用溶胶-凝胶法制备了锐钛矿型纳米二氧化钛粉体，将其涂覆在锌箔上制备了二氧化钛涂层改性锌负极。通过各种表征和测试手段，探究了涂层对锌负极的改善效果，评估了改性后的锌负极在水系锌离子电池中的电化学性能。结果表明，二氧化钛涂层可以诱导锌在负极均匀沉积，由改性锌负极组成的Zn/Zn对称电池可以在1 mA/cm2的电流密度下稳定循环500 h以上。此外，用改性锌负极组装的Zn/MnO₂全电池在0.5 A/g的电流密度下循环100次后容量保持率为82.53%，显著优于用未改性锌负极组装的Zn/MnO₂全电池。 

Titanium dioxide coating-modified zinc cathode and its application in aqueous zinc ion batteries

Anatase-type nanotitanium dioxide powder was prepared by the sol-gel method and coated on zinc foil to prepare a titanium dioxide coating-modified zinc cathode. The improvement effect of the coating on zinc cathode was investigated by various characterization and testing means, and the electrochemical performance of the modified zinc cathode in aqueous zinc ion batteries was evaluated. The results show that the titanium dioxide coating can induce uniform zinc deposition on the cathode, so that the Zn/Zn symmetric cell composed of the modified zinc cathode can be cycled stably for more than 500 h at a current density of 1 mA/cm2. Moreover, the capacity retention rate of the Zn/MnO₂ full cell assembled with the modified zinc cathode is 82.53% after 100 cycles at a current density of 0.5 A/g, which is significantly better than that of the Zn/MnO₂ full cell assembled with an unmodified zinc cathode.