Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea.
J Colloid Interface Sci. 2017 Nov 1;505:631-641. doi: 10.1016/j.jcis.2017.06.069. Epub 2017 Jun 20.
ZnO has had little consideration as an anode material in lithium-ion batteries compared with other transition-metal oxides due to its inherent poor electrical conductivity and large volume expansion upon cycling and pulverization of ZnO-based electrodes. A logical design and facile synthesis of ZnO with well-controlled particle sizes and a specific morphology is essential to improving the performance of ZnO in lithium-ion batteries. In this paper, a simple approach is reported that uses a cation surfactant and a chelating agent to synthesize three-dimensional hierarchical nanostructured carbon-coated ZnO mats, in which the ZnO mats are composed of stacked individual ZnO nanowires and form well-defined nanoporous structures with high surface areas. In order to improve the performance of lithium-ion batteries, HfO is deposited on the carbon-coated ZnO mat electrode via atomic layer deposition. Lithium-ion battery devices based on the carbon-coated ZnO mat passivation by atomic layer deposited HfO exhibit an excellent initial discharge and charge capacities of 2684.01 and 963.21mAhg, respectively, at a current density of 100mAg in the voltage range of 0.01-3V. They also exhibit cycle stability after 125 cycles with a capacity of 740mAhg and a remarkable rate capability.
与其他过渡金属氧化物相比，氧化锌由于其固有的导电性差以及在循环过程中基于 ZnO 的电极的体积膨胀和粉碎，因此作为锂离子电池的阳极材料很少被考虑。具有良好控制的粒径和特定形态的 ZnO 的合理设计和简便合成对于改善 ZnO 在锂离子电池中的性能至关重要。在本文中，报道了一种简单的方法，使用阳离子表面活性剂和螯合剂合成具有三维分级纳米结构的碳涂覆 ZnO 毡，其中 ZnO 毡由堆叠的单个 ZnO 纳米线组成，并形成具有高表面积的明确定义的纳米多孔结构。为了提高锂离子电池的性能，通过原子层沉积在碳涂覆的 ZnO 毡电极上沉积 HfO。基于原子层沉积 HfO 对碳涂覆 ZnO 毡的钝化的锂离子电池器件在电流密度为 100mAg、电压范围为 0.01-3V 时表现出优异的初始放电和充电容量，分别为 2684.01 和 963.21mAhg。它们在 125 次循环后还表现出循环稳定性，容量为 740mAhg，并且具有出色的倍率性能。
