在聚合物电解质中改善运输的离子 π-π 堆叠
Lixin Qiao1,2, Sergio Rodriguez Peña1,3, María Martínez-Ibañez1
1Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Álava Technology Park, Albert Einstein 48, 01510 Vitoria-Gasteiz, Spain.
Journal of the American Chemical Society
|May 31, 2022
概括
新的聚合物电解质 (PE) 使用基于的盐来增强离子导电性和转移数量,提高电池性能. 这种分子设计策略为先进的储能解决方案提供了一条新途径.
科学领域:
- 材料科学
- 电化学
- 聚合物化学
背景情况:
- 聚合物电解质 (PE) 为金属 (Li°) 电池提供了灵活性和可加工性.
- 传统的聚乙烯氧化物 (PEO) 基PE具有较低的离子转移数 (TLi+),导致度梯度和细胞两极分化.
- 开发具有高TLi+和选择性离子导电性的PE对于先进的电池至关重要.
研究的目的:
- 开发具有增强离子转移数和导电性的新型无溶剂PE.
- 研究基盐在提高PE性能方面的作用.
- 探索高性能固态电解质的新分子设计策略.
主要方法:
- 基于的新型盐的合成和表征: (硫) 三甲硫胺 (LiBTFSI) 和 (2,4,6-三甲硫) 三甲硫胺 (LiTPBTFSI).
- 使用PEO的LiBTFSI和LiTPBTFSI制造无溶剂PE.
- 分子动力学 (MD) 模拟以阐明改进的离子传输机制.
- 和LiFePO4电池的电化学性能测试
主要成果:
- 与传统PE相比,新型PE显著改善了TLi+和选择性离子导电性.
- MD模拟显示基离子之间的强 π-π 堆叠相互作用是增强离子运输的原因.
- 在Li°Li°和Li°LiFePO4细胞中,LiBTFSI/ PEO电解质显示出增强的循环性能.
- 开发的PE为更安全,更高效的电池提供了有前途的替代液体电解质.
结论:
- 基于的盐,通过π-π堆叠相互作用,为设计高度选择性的离子导电聚合物电解质提供了有效的策略.
- 这项工作为先进的固态电解质提供了一个简单而高效的分子级设计途径.
- 这些发现为新一代离子电池的开发铺平了道路,
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