通过有机人工固体电解质介相保护阳极,用于硫电池
Joachim Häcker1, Tobias Rommel1, Pia Lange1,2
1Institute of Engineering Thermodynamics, German Aerospace Center (DLR), Pfaffenwaldring 38-40, 70569 Stuttgart, Germany.
ACS applied materials & interfaces
|June 30, 2023
概括
研究人员开发了一种用于硫电池的新型人工固体电解质介相 (SEI) 涂层. 这种涂层通过保护阳极免受寄生反应,显著提高了循环稳定性和放电能力,提高了电池性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硫 (Mg-S) 电池具有高能量密度,并利用丰富,低成本的材料,使其成为有希望的后电池候选人.
- 目前的Mg-S电池由于阳极上的寄生硫减少而遭受不良循环稳定性,导致材料损失和阳极被动化.
- 用人工固体电解质介相 (SEI) 保护阳极是一种可行的策略,可以在不妨碍阴极运动的情况下提高稳定性.
研究的目的:
- 开发和评估Mg-S电池中阳极的有机涂层方法.
- 通过防止阳极上的寄生反应,提高Mg-S电池的循环稳定性和电化学性能.
- 为了研究可扩展和环境条件兼容的涂层技术的实际相关性.
主要方法:
- 在阳极上涂上基于离子体和聚合物的有机涂层 (Aquivion/PVDF).
- 使用Mg-Mg和Mg-S细胞评估了电化学性能,包括测量过度电位和库伦比效率.
- 使用SEM,AFM,IR和XPS进行了表面表征;操作成像用于监测自放电.
主要成果:
- 涂层的阳极显著提高了最初的库伦比克效率,并降低了Mg-S细胞中的电荷过量.
- 在300个循环后,排放能力与原始阳极相比翻了一番,证明了有效的聚硫化物排斥.
- 操作成像证实了减轻的自我放电,由非彩色分离器表示.
- 涂层准备和阳极组装是在环境条件下实现的,从而促进了可扩展性.
结论:
- 人工SEI涂层有效地保护Mg-S电池中的阳极,抑制寄生反应并改善循环稳定性.
- 开发的涂层方法简单,节能,并且与环境条件兼容,提高了Mg-S电池的实际可行性.
- 这项研究强调了阳极表面工程在推进硫电池技术中的关键作用.
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