Xia Tianlai, Wang Yingqian, Mai Chengkang, Pan Guangxing, Zhang Ling, Zhao Weiwei, Zhang Jiaheng
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology Shenzhen 518055 China
Research Centre of Flexible Printed Electronic Technology, Harbin Institute of Technology Shenzhen 518055 China.
RSC Adv. 2019 Jun 19;9(34):19253-19260. doi: 10.1039/c9ra03373d.
ZnO has attracted increasing attention as an anode for lithium ion batteries. However, the application of such anode materials remains restricted by their poor conductivity and large volume changes during the charge/discharge process. Herein, we report a simple hydrothermal method to synthesize ZnO nanosheets with a large surface area standing on a Ni foam framework, which is applied as a binder-free anode for lithium ion batteries. ZnO nanosheets were grown on Ni foam, resulting in enhanced conductivity and enough space to buffer the volume changes of the battery. The ZnO nanosheets@Ni foam anode showed a high specific capacity (1507 mA h g at 0.2 A g), good capacity retention (1292 mA h g after 45 cycles), and superior rate capacity, which are better than those of ZnO nanomaterial-based anodes reported previously. Moreover, other transition metal oxides, such as FeO and NiO were also formed on Ni foam with perfect standing nanosheets structures by this hydrothermal method, confirming the universality and efficiency of this synthetic route.
氧化锌作为锂离子电池的阳极已引起越来越多的关注。然而，这类阳极材料的应用仍受到其导电性差以及充放电过程中体积变化大的限制。在此，我们报道一种简单的水热法来合成具有大表面积且立在泡沫镍框架上的氧化锌纳米片，其被用作锂离子电池的无粘结剂阳极。氧化锌纳米片生长在泡沫镍上，从而提高了导电性并提供了足够的空间来缓冲电池的体积变化。氧化锌纳米片@泡沫镍阳极表现出高比容量（在0.2 A g时为1507 mA h g）、良好的容量保持率（45次循环后为1292 mA h g）以及优异的倍率性能，这些都优于先前报道的基于氧化锌纳米材料的阳极。此外，通过这种水热法，其他过渡金属氧化物，如氧化亚铁和氧化镍，也在泡沫镍上形成了具有完美立状纳米片结构的产物，证实了这种合成路线的通用性和有效性。
