石榴填充剂的表面协调提高了复合固体电解质的有机-无机界面兼容性
Xiaorong Zhang1, Shiyao Liu1, Yuxue Sun1
1National & Local United Engineering Laboratory for Power Battery, Department of Chemistry, Northeast Normal University, Changchun, 130024, China.
Small (Weinheim an der Bergstrasse, Germany)
|October 4, 2024
概括
这项研究通过使用脂酸将无机填充剂化学粘合到聚合物矩阵来增强复合固体电解质 (CSEs). 这种表面协调可以提高接口兼容性和离子导电性,从而实现更安全,更高性能的固态电池.
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
- 固态化学 固态化学
背景情况:
- 复合固体电解质 (CSEs) 与液体电解质相比,具有安全性和灵活性优势.
- 无机填充剂和聚合物矩阵之间的不良界面兼容性阻碍了CSE性能.
- 微弱的有机-无机相互作用导致CSEs的电化学性能降低.
研究的目的:
- 通过将无机填充剂与聚合物矩阵化学结合来提高CSEs的界面兼容性.
- 通过表面协调策略,提高CSE的电化学性能.
- 为了证明表面协调的有效性,开发先进的固态电解质.
主要方法:
- 通过协调通过Li6.4La3Zr1.4Ta0.6O12 (LLZTO) 与脂酸 (LA) 的表面修饰.
- 使用修改后的LLZTO制造复合固体电解质 (P-V-M@LLZTO).
- 电化学表征包括离子导电量测量和对称细胞循环.
- 组装和测试LiFePO4//CSE//Li的完整的细胞.
主要成果:
- 在LLZTO和聚合物矩阵之间通过脂酸表面协调实现化学结合.
- 增强了接口兼容性,并在P-V-M@LLZTO中促进了Li+运输.
- 在30°C时达到6.1×10−4S cm−1的离子导电性.
- 稳定的Li/P-V-M@LLZTO/Li对称细胞循环超过3500小时.
- 在0.5°C的500个循环后,LiFePO4/P-V-M@LLZTO/Li细胞表现出81%的容量保留.
结论:
- 使用脂酸的表面协调是克服CSE界面不兼容性的有效策略.
- 开发的CSE (P-V-M@LLZTO) 证明了固态电池有前途的电化学性能.
- 这种方法为设计高度兼容和导电性的复合体固体电解质提供了一条途径.
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