间层封闭水启用伪电容的离子储存在非水性电解质中
Binhao Wang1, Ziyi Fang1, Qinyao Jiang1
1Department of Materials Science and Engineering, Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen 361005, People's Republic of China.
铁酸盐中隔层封闭的水增强了电化学电容器中的离子储存. 这种新的方法提高了能源密度和容量,为先进的储能设备提供了一条新路线.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 电化学电容器 (EC) 受到低能量密度的限制,主要是由于电双层电容 (EDLC) 型正电极的容量较低.
- 铁酸 (FeV3O8.7·nH2O) 作为一种用于离子储存的新材料正在探索中.
研究的目的:
- 调查铁瓦纳酸盐中介层封闭水对于非水性电解质中离子储存的作用.
- 使用混合电极设计,提高电化学电容器的能量密度和容量.
主要方法:
- 电化学石英晶体微平衡 (EQCM) 是一种
- 在现场拉曼光谱学.
- 现场X射线衍射 (XRD) 和X射线光电子谱学 (XPS) 的研究.
- 混合电极 (FeVO-AC) 和离子电容器的制造
主要成果:
- 在FeV3O8.7·nH2O.中展示了非法拉第克 (EDLC) 和法拉第克 (Na+间隙伪电容) 的电荷存储机制.
- 证实,中间层封闭的水加速了Na+的插入,并且在非水性电解质中保持稳定.
- 与交流电极相比,混合FeVO-AC正电极显示出显著的改进:约2倍的压缩密度,约1.5倍的特异容量和约3倍的体积容量.
- 组装的离子电容器实现了高能量密度 (108 Wh kg-1 在 108 W kg-1 和 15.3 Wh kg-1 在 8.3 kW kg-1).
结论:
- 层间封闭的水在增强离子介质动力学和铁酸盐的稳定性方面发挥着至关重要的作用.
- 混合FeVO-AC电极设计提供了一个有希望的策略,可以显著提高电化学电容器的特定和体积能量密度.
- 这项研究为开发高级储能应用的高性能离子电容提供了一条新的途径.
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