从有机电解质获得高能量密度的石墨烯/单层碳纳米管离子电容器
Hang Yin1,2, Jie Tang1,2, Kun Zhang1
1National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Ibaraki, Japan.
Nanomaterials (Basel, Switzerland)
|January 11, 2024
概括
研究人员开发了一种新的电解质,Bis (pentafluoroethanesulfonyl) imide (LiBETI),使离子电容器 (LIC) 在4.5V下运行. 这一突破显著提高了先进的储能应用的能量密度和稳定性.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 高能量密度对于离子电容器 (LIC) 是至关重要的,但传统的电解质由于极化而限制工作电压低于3.8V.
- 开发先进的电极材料和稳定的电解质是克服这些局限性的关键.
研究的目的:
- 为高压LIC引入一种新型电解质,Bis (pentafluoroethanesulfonyl) imide (LiBETI),用于高压LIC.
- 调查使用LiBETI和石墨烯/单壁碳纳米管 (SWCNT) 阴极的LICs的电化学性能和稳定性.
主要方法:
- 使用LiBETI电解质构建了一个三电极离子电容系统.
- 预先化石墨阳极以稳定其电位并形成固体电解质接口 (SEI) 膜.
- 采用自合成的石墨烯/单壁碳纳米管 (SWCNT) 复合物作为正极材料.
主要成果:
- 利贝蒂电解质使得LIC的稳定工作电压窗口为4.5V.
- 开发的LIC实现了182Wh kg-1的高能量密度和4.5V的2678W kg-1的功率密度.
- 该设备表现出良好的循环稳定性,在2 A g-1.1 的 10.000 个循环后保持 72.7% 的容量.
结论:
- 利贝蒂是高压离子电容器的有希望的电解质,提供卓越的导电性和稳定性.
- 结合LiBETI和石墨烯/SWCNT阴极,可以显著提高能量和功率密度.
- 这项研究为下一代具有更高性能的储能设备铺平了道路.
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