乙烯碳酸盐激活的凝聚合物电解质用于稳定的高压金属电池
Min Wang1,2, Mengjie Li3, Junru Wu1,2
1Institute of Materials, Research Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China.
Advanced materials (Deerfield Beach, Fla.)
|May 13, 2025
概括
使用乙烯碳酸盐 (FEC) 和五甲酸 (PFPMA) 的新混合凝聚合物电解质通过稳定接口和改善离子传输来提高高压金属电池的性能.
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
- 聚合物科学 聚合物科学
背景情况:
- 高压金属电池 (LMB) 面临着与传统电解质的挑战.
- 乙烯碳酸盐 (FEC) 显示出有希望的结果,但由于HF形成,在高电压下降解.
- 电极接口的不稳定性限制了LMB的性能.
研究的目的:
- 开发一种混合凝聚合物电解质 (HGPE),用于稳定的高压LMB运行.
- 为了提高LMB的电压范围和界面稳定性.
- 为了克服FEC分解问题在高潜力.
主要方法:
- 使用FEC溶剂和甲酸 (PFPMA) 单体合成了一种新的HGPE.
- 该PFPMA单体形成了一个保护性的混合层固体电解质与LiDFOB的相间.
- 利用FEC,PFPMA和聚合物段的协同效应来改善Li+运输.
主要成果:
- 这种HGPE有效地抑制了FEC分解,并稳定了电极接口.
- 达到了0.87的高Li+转移数,表明改善了离子流动性.
- 带有HGPE的Lihidroji NCM811电池显示出优异的容量保留 (83.4%在4.5V的300个循环后).
结论:
- 开发的HGPE为高压LMB提供了一个有前途的战略.
- 基于PFPMA的电解质增强了接口稳定性和电化学性能.
- 这种方法使LMB在高电压下能够稳定运行.
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