复合类半固态电解质与有机-无机接口工程,用于在无石金属电池中的快速离子运输
Wenyue Tian1, Zhaopeng Li1, Licheng Miao1
1Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University, Tianjin, 300071, China.
Advanced materials (Deerfield Beach, Fla.)
|December 18, 2023
概括
这项研究引入了一种用于准固态电解质 (QSSE) 的复合膜,以改善离子导电性并防止树的生长. 这一创新提高了固态金属电池的稳定性和性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 准固态电解质 (QSSE) 面临异质离子流和状物生长的挑战,原因是液体溶剂和聚合物中的离子运输不同.
- 在QSSE-阳极接口的副作用加剧了树突形成,限制了电池的性能和安全性.
研究的目的:
- 为QSSE开发一种新型的复合电膜,以增强离子 (Na+) 运输和抑制状物生长.
- 为了提高固态金属电池的离子导电性和长期循环稳定性.
主要方法:
- 在QSSE中集成Na3Zr2Si2PO12和聚乙烯化物-co-hexafluoropropylene (PVDF-HFP) 的复合电膜.
- 离子运输路径,离子导电性和Na+转移数的表征.
- 评估固体电解质介相 (SEI) 形成和在阳极接口的树抑制.
- 在对称和充满电池配置中测试循环稳定性.
主要成果:
- 复合QSSE在室温下实现了4.1mS cm-1的超高离子导电性.
- 记录了0.54的高Na+转移数,表明有效的离子迁移.
- 形成一个"富含NaF"的固体电解质间相 (SEI) 有效地抑制了树的生长.
- 证明了特殊的长期循环稳定性,对称电池运行约700小时,充满电池完成2100个循环.
结论:
- 新的复合电膜策略有效地使离子迁移均质化,并引入快速的离子导电道.
- "富含NaF"的SEI层提供了强大的保护,防止树石的形成,提高了电池的安全性.
- 这种方法为开发高性能,无石固态金属电池提供了有希望的途径.
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