Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, Fuzhou University, Fuzhou, Fujian 350002, China; State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou, Fujian 350002, China.
College of Environment Science and Engineering, Fujian Normal University, Fuzhou, Fujian 350007, China.
J Colloid Interface Sci. 2019 Dec 1;557:722-728. doi: 10.1016/j.jcis.2019.09.078. Epub 2019 Sep 21.
In this work, an electrode has been proposed and designed on its interior structure and controlled morphology, Specifically, metallic WS hollow microspheres have been synthesized via a one-step solvothermal process, in the absence of additives, consisting of porous nanosheets with a large surface area. The individual nanosheet features an expanded interlayer distance of 1.02 nm and metallic characteristics, which can provide faster transport of electrons and reduce the diffusion pathway for sodium ions. Furthermore, the effects of anions in the ether-based electrolyte on the cycling performance were also investigated and optimized. As a result, such an anode can demonstrate superior capacitive behavior with excellent rate performance (388.2 mA h g at 0.1 A g, 307.7 mA h g at 1 A g) and long-term cycling stability (285 mA h g at 2 A g after 2000 cycles).
在这项工作中，提出并设计了一种具有内部结构和控制形态的电极。具体来说，通过一步溶剂热法在没有添加剂的情况下合成了金属 WS 空心微球，其由具有大表面积的多孔纳米片组成。单个纳米片具有扩展的层间距为 1.02nm 和金属特性，这可以提供更快的电子传输并减少钠离子的扩散途径。此外，还研究和优化了醚基电解质中阴离子对循环性能的影响。结果表明，这种阳极具有优异的倍率性能（在 0.1A/g 时为 388.2mA·h/g，在 1A/g 时为 307.7mA·h/g）和长期循环稳定性（在 2A/g 下 2000 次循环后为 285mA·h/g）的卓越电容性能。
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