高导电性伊米达酸共价有机框架与以太链作为金属电池的固体电解质
Yufei Yuan1, Zeyu Zhang2, Zhengyang Zhang2
1Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, Hong Kong SAR, China.
Angewandte Chemie (International ed. in English)
|February 20, 2024
概括
新的带有以太链的离子共价有机框架 (iCOF) 为先进的电池提供高离子导电性和稳定的接口. 这些材料克服了传统聚乙烯氧化物电解质的局限性,为下一代储能解决方案铺平了道路.
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:
- 基于聚乙烯氧化物 (PEO) 的电解质被广泛用于离子 (Li+) 导电,这是由于高效的盐分离.
- PEO电解质的局限性包括链纠和受限的离子扩散通路,阻碍其在先进电池中的使用.
- 离子共价有机框架 (iCOF) 提供有序结构,促进快速Li+运输,解决PEO限制.
研究的目的:
- 为固态电解质合成和表征新型伊米达酸共价有机框架 (COFs) 与甲氧氧侧链.
- 为了评估这些iCOF的电化学性能,特别是它们的Li+导电性和转移数.
- 评估iCOF与金属的界面稳定性及其在LiFePO4电池中的性能.
主要方法:
- 通过Debus-Radziszewski多组分反应合成PI-TMEFB-COFs.
- 电离以形成Li+@PI-TMEFB-COFs. 这是一种离子.
- 电化学表征包括导电性测量,转移数的确定和电池循环测试.
主要成果:
- +@PI-TMEFB-COF具有较高的+导电性 (8.81 mS cm-1) 和较高的转移数 (0.974).
- 甲氧氧链促进Li+解离和通过COF孔的运输,形成与Li金属的稳定接口.
- 用Li+@PI-TMEFB-COF组装的LiFePO4电池在0.5°C时的初始放电容量为119.2 mAh g-1,在400个循环后容量保留为82.0%.
结论:
- 通过多元组分反应合成的以太链的伊米达酸盐COF代表了一类有前途的固体电解质.
- 这些iCOF克服了传统PEO电解质的局限性,提供高效的离子传输和稳定的接口.
- 这些发现为开发使用基于iCOF的固体电解质的先进可充电电池开辟了新的途径.
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