竞争性协调效应诱导的溶剂分离离子对使固态电池的快速Li+离子运输和稳定的固体电解质介相成为可能
Haofeng Peng1, Yongqing Yang1, Guoyu Wang1
1School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, Sichuan, PR China.
Journal of colloid and interface science
|October 24, 2025
概括
这项研究表明,固体聚合物电解质中的溶剂分离离子对 (SSIP) 可以显著提高离子电池的性能. 定制SSIP度可以提高离子导电性,并稳定固体电解质间相 (SEI),从而延长电池寿命.
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
- 聚合物化学 聚合物化学
背景情况:
- 固体聚合物电解质 (SPEs) 中的溶剂协调结构 (CIP,AGG,SSIP) 极大地影响离子导电性和固体电解质间相 (SEI) 形成.
- 溶剂分离离子对 (SSIP) 对SEI稳定性和离子传输的特定影响尚未得到充分研究,尽管它们已知的协作效应.
研究的目的:
- 通过精确控制其度,调查SSIP在SPE中的独特作用.
- 了解SSIP如何独立影响Li+离子运输和SEI形成.
主要方法:
- 通过加入乙烯碳酸 (VC) 来合成具有不同SSIP度 (0-2.8%) 的SPEs.
- 进行实验分析和理论计算,以评估离子导电性和SEI特性.
- 执行电化学测试在Li干Li对称电池和Li干LFP电池,以评估循环稳定性和性能.
主要成果:
- 由竞争协调引发的SSIP促进了快速的离子运输.
- 促进有机/无机复合SEI,导致稳定的电化学接口与均分布的化 (LiF).
- 在0.1 mA cm−2下,LFP电池实现了550个循环,具有>99.9%的库伦比效率和96.5%的容量保留.
结论:
- 在SPE中独立研究SSIP提供了对其在电池性能中的作用的关键见解.
- 定制SSIP度是开发具有增强稳定性和导电性的先进金属电池的可行策略.
- 这些发现为优化高性能储能应用的SPE提供了一条新的途径.
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