作为离子导向通道的与尿素连接的共价有机框架,使得碳酸基电解质中的超稳定的金属阳极成为可能
Caihong Zhang1, Zhen Luo1, Kean Chen1
1Hubei Key Laboratory of Electrochemical Power Sources, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China.
Angewandte Chemie (International ed. in English)
|March 20, 2025
概括
研究人员开发了一种与尿素结合的新型共价有机框架 (COF-531) 来稳定金属阳极. 这种材料可以使沉积均,抑制树的生长,并显著提高高能耗应用的电池寿命和安全性.
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
- 纳米技术纳米技术
背景情况:
- 金属阳极具有高能量密度,但受到状物生长和不稳定的固体电解质介相 (SEI) 的影响,限制了实际的电池应用.
- 控制沉积对于提高可充电金属电池的安全性和循环寿命至关重要.
研究的目的:
- 设计和合成一种新的共价有机框架 (COF-531) 用作金属阳极上的接口层.
- 研究COF-531引导离子运输和促进均沉积的能力,从而抑制树岩的形成.
主要方法:
- 使用富含N的胺合成与尿素结合的共价有机框架 (COF-531).
- 制造COF-531涂层的金属阳极 (COF@Li).
- 在各种电流密度和循环计数下对称Li电池和带COF@Li阳极的Li-S电池的电化学测试.
主要成果:
- COF-531表现出丰富的酸位和有序离子通道,促进有效的Li+脱溶和运输.
- COF@Li阳极表现出了显著的循环稳定性,能够在对称细胞中承受10 mA cm−2 11500小时,20 mA cm−2 6000小时.
- 在8.4 A g-1的500个循环后,COF@Li infrared S-in-CMK-3电池实现了1013 mAh g-1,在Li-S电池配置中显示出出色的性能.
- 在千克尺度上,COF-531材料可以较低的成本 (约为58.6美元/公斤) 生产.
结论:
- 开发的与尿素结合的COF-531有效地解决了金属阳极中的树脂增长和SEI不稳定性.
- 这种新型接口层显著提高了高能量密度可充电电池的循环性能和安全性.
- 具有成本效益和可扩展的COF-531生产为先进的金属电池的商业化提供了可行的途径.
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