Wang Shuting, Zhang Shipeng, Chen Xiangrui, Yuan Guanghui, Wang Beibei, Bai Jintao, Wang Hui, Wang Gang
State Key Laboratory of Photoelectric Technology and Functional Materials, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi'an 710127, PR China; Shaanxi Joint Lab of Graphene (NWU), Xi'an 710127, PR China.
State Key Laboratory of Photoelectric Technology and Functional Materials, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi'an 710127, PR China.
J Colloid Interface Sci. 2020 Nov 15;580:528-539. doi: 10.1016/j.jcis.2020.07.053. Epub 2020 Jul 15.
Currently, aqueous zinc-ion batteries are receiving extraordinary attention because of their cheap price, superior energy density and great security. However, the inferior specific capacity and low rate capability significantly hamper their further widespread application. Herein, a novel egg waffle-like architecture consisting of double-shell ZnMnO hollow microspheres embedded in 2D carbon networks (ZnMnO@C) is designed and employed as a cathode material for aqueous zinc-ion batteries. Specifically, the ZnMnO@C electrode displays a capacity of 481 mAh g at 0.2 A g after 110 cycles with excellent cycling stability. The superior cycling stability of the ZnMnO@C electrode is ascribed to the synergistic effect of the double-shell ZnMnO hollow microspheres, which offer sufficient space to withstand volume expansion during Zn intercalation/deintercalation process, as well as the 2D continuous conductive and interconnected carbon network, which facilitates rapid electronic transmission and guarantees good structural mechanical stability. This study offers a fascinating cathode material and extends the available choices for manganate based-materials in rechargeable aqueous zinc-ion batteries.
目前，水系锌离子电池因其价格低廉、能量密度高和安全性好而备受关注。然而，其较差的比容量和低倍率性能严重阻碍了它们的进一步广泛应用。在此，设计并采用了一种新型的华夫饼状结构，该结构由嵌入二维碳网络（ZnMnO@C）中的双壳ZnMnO中空微球组成，并用作水系锌离子电池的正极材料。具体而言，ZnMnO@C电极在0.2 A g下经过110次循环后，容量为481 mAh g，具有出色的循环稳定性。ZnMnO@C电极优异的循环稳定性归因于双壳ZnMnO中空微球的协同效应，其提供了足够的空间来承受锌嵌入/脱嵌过程中的体积膨胀，以及二维连续导电且相互连接的碳网络，这有利于快速的电子传输并保证良好的结构机械稳定性。本研究提供了一种引人入胜的正极材料，并扩展了可充电水系锌离子电池中锰酸盐基材料的选择范围。
