通过将尿素添加到无电解质中来调节Mg金属阳极的界面动力学
Engy El-Dek1, Ahmed H Tantawy1, Shuyong Cheng2
1Chemistry Department, Faculty of Science, Benha University,13518 Benha, Egypt.
Langmuir : the ACS journal of surfaces and colloids
|August 25, 2025
概括
尿素添加剂通过改善无电解质中的离子传输来稳定硫电池接口. 这提高了电池的性能,并减少了聚硫化物扩散,使循环更稳定.
科学领域:
- 电化学
- 材料科学
背景情况:
- 硫 (Mg-S) 电池具有较高的理论能量密度.
- (Mg) 金属阳极的界面动力学对Mg-S电池的性能至关重要.
- 稳定电解质接口和改善2+运输是关键的挑战.
研究的目的:
- 研究尿素 (TU) 添加剂对无素电解质 (HFE) 的Mg电解质接口的影响.
- 提高Mg-S电池的Mg2+运输和电化学性能.
- 阐明TU在调节界面运动中的机制.
主要方法:
- 将尿素 (TU) 添加到基于 Mg ((NO3) 2·6H2O 的无电解质中
- 电化学表征包括离子导电性和转移数量测量.
- 组装和测试Mg-S硬币电池
- 使用X射线衍射 (XRD),富里埃变换红外光谱 (FTIR),扫描电子显微镜 (SEM) 和能量分散X射线光谱 (EDS) 的表面分析.
主要成果:
- 优化TU含量 (0.05-0.2g/1.5g盐) 改善了离子流动性和离子导电性.
- 随着TU的修改,转移数增加到0. 81.
- 通过TU修改的电解质导致更高的初始放电容量 (880 mAh g-1) 和更好的循环稳定性.
- 在TU修改系统中观察到多硫化物扩散的减少.
- 鉴定证实Mg阳极上形成了一个更加均和稳定的界面层.
结论:
- 在没有素的电解质中,尿素有效调节Mg阳极的界面动力学.
- 使用TU添加剂的电解质工程为提高Mg-S电池性能提供了一个有希望的策略.
- 这项研究展示了一种简单但有效的稳定Mg电解质接口的方法.
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