烯酸连接的共价有机框架,具有电子负通道作为可持续金属电池阳极的电离子高速公路
Zhongping Li1,2, Linhai Sun3, Lipeng Zhai3
1Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, Republic of Korea.
Angewandte Chemie (International ed. in English)
|July 25, 2023
概括
带有电子负通道的烯酸结合共价有机框架 (COF) 促进了统一的离子 (Li+) 运输. 这一突破解决了树的生长问题,并提高了电池性能,以实现更安全,更高效的金属阳极.
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
- 聚合物化学 聚合物化学
背景情况:
- 由于其较大的理论容量,金属阳极非常理想.
- 不受控制的树增长和不稳定的固体电解质介相阻碍了实际应用.
- 缓慢且不均的Li+迁移有助于这些局限性.
研究的目的:
- 开发新型材料,以促进选择性和均的Li+运输.
- 为了克服与金属电池中树形成相关的挑战.
- 为了提高离子导电率和Li+转移数,以提高电池性能.
主要方法:
- 用电子负通道合成烯酸结合的共价有机框架 (COFs).
- 将 triazine 环和化基纳入 COF 结构.
- 通过将COF与聚合物粘合剂相结合,制造混合矩阵膜.
主要成果:
- 实现了0.85.8的高Li+转移数.
- 获得的高离子导电率为1.78mS cm-1.
- 在Li/Li对称细胞中,在700小时内证明了可靠的涂/剥离循环.
- 在Li/LiFePO4电池中展示了稳定的容量保留.
结论:
- 带有负电子通道的烯酸结合氧化,有效地促进了选择性Li+运输.
- 开发的膜显示出在金属电池中加速Li+导电的巨大潜力.
- 这种方法为实现更安全,更高效的金属阳极提供了可行的策略.
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