Liu Yuyi, Li Qian, Ma Kaixuan, Yang Gongzheng, Wang Chengxin
State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering , Sun Yat-sen (Zhongshan) University , Guangzhou 510275 , People's Republic of China.
The Key Laboratory of Low-carbon Chemistry & Energy Conservation of Guangdong Province , Sun Yat-sen (Zhongshan) University , Guangzhou 510275 , People's Republic of China.
ACS Nano. 2019 Oct 22;13(10):12081-12089. doi: 10.1021/acsnano.9b06484. Epub 2019 Sep 27.
Rechargeable aqueous zinc-ion batteries are considered as a promising alternative of lithium-ion batteries for stationary energy storage because of their economical and high safety quality. However, their widespread application is still impeded by the development of cathode materials with poor energy density and limited long-term stability. Herein, we report a high-performance CuVO cathode material for aqueous zinc-ion batteries and elucidate the zinc-storage mechanism. The reversible phase transformation between CuVO and ZnVO, accompanied by zinc ion insertion/extraction and the reduction/oxidation of metallic Cu nanoparticles, all contribute to excellent battery performance: an impressively high specific capacity of 427 mA h g at current density of 0.1 A g, long-term cycling stability with minor capacity loss (0.7%) after 3000 cycles at a high current density of 5 A g, and a high energy density of 317 Wh kg at a power density of 210 W kg. Furthermore, graphene oxide wrapped CuVO nanocomposites are successfully fabricated, which demonstrates the significantly enhanced specific capacity (at least 30% improvement). This work provides an intriguing cathode material and expands available options of transition metal vanadate materials for zinc-ion batteries.
可充电水系锌离子电池因其经济实惠且安全性高，被视为锂离子电池用于固定式储能的一种有前景的替代方案。然而，能量密度低且长期稳定性有限的正极材料的发展仍阻碍着它们的广泛应用。在此，我们报道了一种用于水系锌离子电池的高性能CuVO正极材料，并阐明了其储锌机制。CuVO与ZnVO之间的可逆相变，伴随着锌离子的嵌入/脱出以及金属铜纳米颗粒的还原/氧化，共同促成了优异的电池性能：在0.1 A g的电流密度下具有高达427 mA h g的比容量，在5 A g的高电流密度下循环3000次后容量损失极小（0.7%），具有长期循环稳定性，在210 W kg的功率密度下能量密度高达317 Wh kg。此外，成功制备了氧化石墨烯包裹的CuVO纳米复合材料，其比容量显著提高（至少提高30%）。这项工作提供了一种引人关注的正极材料，并扩展了用于锌离子电池的过渡金属钒酸盐材料的选择范围。
