解读聚硫化物溶解结构对硫电池电气双层化学的影响
Weiqi Yao1, Min-Hao Pai1, Arumugam Manthiram1
1Materials Science and Engineering Program & Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas, 78712, USA.
Angewandte Chemie (International ed. in English)
|March 10, 2025
概括
研究人员开发了一种用于室温硫电池的新电解质. 这种局部高度电解质 (LHCE) 减少了聚硫化物问题,提高了电池的稳定性和性能,用于大规模储能.
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:
- 室温硫 (RT Na-S) 电池为电网规模的储能提供了潜力.
- 关键的挑战包括聚硫化物 (NaPS) 穿效应和树的生长,主要是由于NaPS的高溶解度.
- 电气双层 (EDL) 对接口化学和电池性能至关重要.
研究的目的:
- 为了研究NaPS溶解结构和EDL化学之间的关系.
- 设计新型电解质,减轻NaPS溶解度,提高RT Na-S电池的性能.
- 阐明基于分子结构和界面性质的电解质设计方法.
主要方法:
- 对各种溶剂 (DME,THF,THP) 和稀释剂 (ETFE) 的计算模拟和实验选.
- 分析NaPS溶解结构及其对EDL化学的影响.
- 使用定制的电解质对RT Na-S电池进行电化学测试.
主要成果:
- 基于THP的局部高度电解质 (LHCE) 被确定通过修改溶解来降低NaPS溶解度.
- LHCE促进稳定的无机固体电解质间相 (SEI) 形成,并增强金属的兼容性.
- 配备LHCE-THP/ETFE的Na-S电池在1°C时表现出超过500个周期的稳定性,每周期容量衰减为0.07%.
结论:
- 基于分子结构和溶解特性的电解质设计可以有效地解决NaPS穿效应.
- 对于稳定和高性能RT Na-S电池,LHCE-THP/ETFE提供了一个有前途的策略.
- 这项工作为下一代电池技术中的合理电解质设计提供了框架.
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