作为高性能金属电池的固体电解质介质的基于酸盐的共价有机框架
Chen Li1, Dan-Dong Wang2, Gerald Siu Hang Poon Ho1
1Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR, People's Republic of China.
Journal of the American Chemical Society
|November 2, 2023
概括
研究人员开发了新的基于基的共价有机框架 (AQ-Si-COFs),以提高金属电池的安全性. 这些材料作为固体电解质介质,抑制树突的生长,提高电池性能,可靠地储存能量.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 金属电池 (LMB) 具有高能量密度,但由于阳极树突和不稳定的接相而面临安全挑战.
- 由于其离子导电性和稳定性,共价有机框架 (COF) 对固体电解质介面 (SEI) 有希望.
研究的目的:
- 为金属电池合成和评估基于酸盐的新型COF (AQ-Si-COF) 作为固体电解质界面 (SEI).
- 调查AQ-Si-COF的电化学特性和树抑制能力.
主要方法:
- 通过二氧化凝结四氧化合成AQ-Si-COFs.
- 合成的COF的离子导电性和转移数的表征.
- 在阳极上使用 AQ-Si-COF 作为 SEI 的 LMB 电池对 LiCoO2 阴极进行测试.
主要成果:
- AQ-Si-COF表现出高的离子导电性 (9.8 mS cm-1) 和高的单离子转移数 (0.92).
- 在0.25°C时,LMB电池的可逆容量为188mAhg−1且稳定高压运行.
- 在100个循环中抑制了树突的生长和保持能力,减少不到3%.
结论:
- 氧化还原活性和阳离子AQ-Si-COF作为金属电池中的SEI是有效的.
- 这些COF显著提高了电池的安全性和可循环使用性,为实际的LMB应用铺平了道路.
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