Journal of Power Sources ( IF 9.2 ) Pub Date : 2021-02-16 , DOI: 10.1016/j.jpowsour.2021.229623 Xiang Lv , Wanxia Huang , Qiwu Shi , Lu Tang , Jibin Tang
Vanadate nanomaterials with unique amorphous phase possess more active sites and isotropic nature, which is in favor of facilitating the diffusion of electrolyte ions into the electrode materials during the charge/discharge process and providing high capacitance for samples. Hereby, we report the preparation of the amorphous NiCozVxOy(NCVO) nanosphere as electrode materials for supercapacitors via a facile method using ethanol as the agent for assembly materials. The NCVO delivers a specific capacitance of 1449.3 F/g at 2 A/g with excellent rate capability. And the asymmetric supercapacitor devices achieve a high energy density of 45 Wh/kg at 1 A/g, a power density of 8000 W/kg at 10 A/g and good capacitance retention of 91.4% after 2000 cycles compared with its initial value under the voltage window of 1.6 V. The amorphous NCVO nanosphere prepared by the facile route exhibits attractive electrochemical properties and provides a potential candidate as energy storage materials for supercapacitors.
中文翻译:
通过不对称超级电容器的便捷路线合成非晶态NiCo z V x O y纳米球作为正极材料
具有独特非晶相的钒酸盐纳米材料具有更多的活性位点和各向同性,有利于在充电/放电过程中促进电解质离子向电极材料中的扩散,并为样品提供高电容。据此,我们报告了非晶态NiCo z V x O y的制备(NCVO)纳米球用作超级电容器的电极材料,方法是使用乙醇作为组装材料的代理,采用简便的方法。NCVO在2 A / g时提供1449.3 F / g的比电容,具有出色的倍率能力。与之相比,非对称超级电容器器件在1 A / g时具有45 Wh / kg的高能量密度,在10 A / g时具有8000 W / kg的功率密度,并且在2000次循环后与初始值相比具有91.4%的良好电容保持率。电压窗口为1.6V。通过该简便路线制备的非晶态NCVO纳米球具有诱人的电化学性能,并有望作为超级电容器的储能材料。