在聚合物电解质中的溶剂动力学 硫电池的聚合物电解质
Luisa Gomes1, Huidong Dai1, Daniel Chambers1
1Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts 02115, United States.
ACS nano
|May 16, 2025
概括
具有优化溶剂性能的聚烯基基基聚合物电解质 (GPEs),特别是二甲基乙 (DME),通过增强离子运输和聚硫化物限制,显著提高硫 (Li-S) 电池性能. 这导致下一代能源存储的容量增加和循环寿命延长.
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 (Li-S) 电池具有高的理论能量密度,但受到缓慢的硫氧化还原反应动力学和聚硫化物穿效应的限制.
- 基于聚烯酸 (PCL) 的凝聚合物电解质 (GPEs) 正在探索以减轻这些问题,但溶剂特性的影响仍未得到充分研究.
研究的目的:
- 系统地研究溶剂性质 (介电常数,输送器/接收器数) 对基于PCL的Li-S电池的GPE的影响.
- 为了将溶剂特性与GPE物理特征相关联,Li+运输,溶解和聚硫化物封闭.
主要方法:
- 基于PCL的三种使用二甲基乙 (DME),二甲基硫氧化物 (DMSO) 和四乙烯糖醇二甲基乙烯 (TEGDME) 的GPEs的比较.
- 对GPEs的物理性质,离子导电性,Li+转移数和电化学性能 (特异容量,库伦比效率) 的表征.
- 使用拉曼运算和紫外线光谱来确认PCL的聚硫化物限制.
主要成果:
- 基于DME的GPE,具有中间捐赠者数,显示了最低的晶度 (2.31%),最高的离子导电性 (7.49mS/cm),以及高的Li+转移数 (0.77).
- 这种基于DME的GPE实现了795 mAh/g硫的特定容量和97.5%的平均Coulombic效率在C/5.5的120个循环中.
- 操作式光谱学证实了PCL在限制聚硫化物方面的有效性,减少了穿效应.
结论:
- 具有中度供体数和平衡介电常数的GPE显著提高了Li-S电池的稳定性,周期寿命和速率性能.
- 在基于PCL的GPE中优化溶剂特性对于推进实用的Li-S电池技术至关重要.
- 这项研究为设计下一代储能电解质系统提供了关键的见解.
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