通过低温硫电池的阳离子受体调节多硫化物聚合
Mengxue He1, Yun An1, Lujun Zhu1
1Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, Beijing 100871, China.
Nano letters
|February 12, 2025
概括
这项研究引入了一种新的策略,使用化离子接受器来破坏多硫化物 (LiPSs) 聚类,在恶劣的低温条件下显著提高硫电池性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硫 (Li-S) 电池在低温和缺乏电解质的情况下面临性能限制,这是由于多硫化物 (LiPS) 的聚合.
- 这种聚类阻碍了反应动力学,并阻碍了高效的硫利用.
研究的目的:
- 制定一项战略,以破坏LiPSs集群并提高Li-S电池在恶劣运行条件下的性能.
- 研究一种新型化阳离子受体在调节LiPSs溶解和促进硫反应中的作用.
主要方法:
- 利用tris ((perfluorophenyl) 作为化离子受体与LiPSs进行相互作用.
- 研究了离子受体对LiPSs溶解结构和聚类的影响.
- 评估了低温 (-25°C和0°C) 的Li-S电池的电化学性能.
主要成果:
- 阳离子受体有效地破坏了LiPSs的聚合,并促进了Li2S溶解.
- 在低温下促进了溶液介导的三维Li2S生长机制.
- 在 -25 °C显著提高容量和稳定循环 (在50个循环中保持96.0%的容量) 在0 °C以1.83 Ah袋式电池显著提高.
结论:
- 使用化阳离子受体的集群破坏策略在克服LiPSs集群问题方面是有效的.
- 这种方法在恶劣条件下提高了Li-S电池的性能,为电解质化学操纵提供了一个一般的方法.
- 这项研究为更强大,更高效的硫电池技术铺平了道路.
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