在混合准固体电解质中自组装的单层可以提高接口稳定性和离子导电
Wenyi Ma1, Yuxiang Guo2, Jianqi Sun3
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China.
Angewandte Chemie (International ed. in English)
|November 28, 2024
概括
使用4-二硫酸 (CBSA) 的新型自组装单层策略增强了用于耐用固态电池的混合准固体电解质 (HQSE) 的稳定性和离子导电性.
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:
- 混合准固体电解质 (HQSE) 面临的挑战是由于复杂的无机固体电解质 (ISE) 和液体电解质 (LE) 相互作用,影响接口稳定性和离子导电性.
- 研究ISE表面修饰对离子导电性的影响对于开发先进的电池技术至关重要.
研究的目的:
- 通过修改 Li$_{6.4}$La$_{3}$Zr$_{1.4}$Ta$_{0.6}$O$_{12}$ (LLZTO) 无机固体电解质的表面来提高混合类准固体电解质 (HQSE) 的接口稳定性和离子导电性.
- 在修改后的HQSE系统中探索增强的离子导电和接口稳定性的机制.
主要方法:
- 在LLZTO表面上使用4-硫酸 (CBSA) 制造自组装单层 (SAM).
- 将修改后的LLZTO纳入基于PEGDA的现场聚合HQSE.
- 电化学表征,包括离子导电性和转移数测量.
- 使用密度函数理论 (DFT),拉曼光谱和Li固态核磁共振进行高级表征.
主要成果:
- 经过CBSA修改的LLZTO显著提高了LLZTO/LE接口的稳定性,并优化了溶解结构.
- 取得了1.19mS·cm-1的有利离子导电性和0.647的增加的Li+转移数.
- 经过1000小时后,在Li干细胞SAM-HQSE干细胞中表现出优异的长期循环稳定性,没有短路.
- 在LFP saqsaM-HQSE saqsaLi和LFP saqsaM-HQSE saqsaGraphite袋式电池中实现了高容量保留.
结论:
- SAM战略有效地增强了LLZTO的表面微环境,促进和同质化HQSE中的Li+传导.
- 这种简单的方法为构建先进的离子电池的稳定和高性能混合型准固体电解质提供了有希望的途径.
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