Shen Shijie, Zhong Wenwu, Huang Xiaohua, Lin Yan, Wang Tianle
Department of Materials Engineering, Taizhou University, Taizhou 318000, China.
Materials (Basel). 2019 Apr 11;12(7):1193. doi: 10.3390/ma12071193.
Well-designed nanostructures are very important for the electrochemical performance of lithium-ion electrode materials. In order to improve the electrochemical performance of ZnO-based anode materials, ZnO/Ni composite film, assembled by ordered hollow microsphere arrays, is designed and fabricated by means of magnetron sputtering technique using a colloidal crystal template composed of a monolayer of ordered polystyrene (PS) microspheres. The ordered hollow microsphere structure as well as the constituent Ni component of the ZnO/Ni film show major advantages of homogenizing electrode reactions, enhancing electrode reaction kinetics and accommodating volume change of active materials, so they can reduce electrode polarization and stabilize electrode structure. Consequently, the resulting ordered ZnO/Ni hollow microspheres arrays deliver an initial charge capacity of 685 mAh g, an initial coulombic efficiency of 68%, and a capacity retention rate of 69% after 100 cycles, all of which are higher than those of the pure ZnO film. These results show progress in developing more stable ZnO-based anode materials for lithium ion batteries.
设计良好的纳米结构对于锂离子电极材料的电化学性能非常重要。为了提高氧化锌基负极材料的电化学性能，采用磁控溅射技术，以由单层有序聚苯乙烯（PS）微球组成的胶体晶体模板，设计并制备了由有序中空微球阵列组装而成的氧化锌/镍复合薄膜。氧化锌/镍薄膜的有序中空微球结构以及组成成分镍展现出使电极反应均匀化、增强电极反应动力学和适应活性材料体积变化的主要优势，因此它们可以降低电极极化并稳定电极结构。结果，所得的有序氧化锌/镍中空微球阵列的首次充电容量为685 mAh g，首次库仑效率为68%，100次循环后的容量保持率为69%，所有这些均高于纯氧化锌薄膜。这些结果表明在开发用于锂离子电池的更稳定的氧化锌基负极材料方面取得了进展。
