通过稀释剂-溶剂相互作用调节电解质溶解结构,用于安全的高压金属电池
Yuqi Liu1, Jin Li2, Xiaolan Deng3
1Research Institute of Materials Science, South China University of Technology, Guangzhou, 510640, China.
Small (Weinheim an der Bergstrasse, Germany)
|March 7, 2024
概括
在局部高度电解质 (LHCE) 中的结合是下一代电池的关键. 这项研究使用了TFSF稀释剂与DME溶剂,以创建高压金属电池的稳定,不可燃电解质.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 电池技术 电池技术
背景情况:
- 局部高度电解质 (LHCEs) 对于稳定先进电池中的高压阴极和金属阳极具有前景.
- 了解LHCE中的溶解结构和物种相互作用对于进一步的电解质开发至关重要.
- 当前的LHCE系统在优化相间形成和稳定性方面面临着挑战.
研究的目的:
- 研究稀释剂和溶剂之间的结相互作用在构建LHCE中的关键作用.
- 通过使用特定的稀释剂-溶剂组合,为高压金属电池 (LMB) 开发一种非易燃的LHCE.
- 阐明这些相互作用如何调整溶解结构并影响相间化学.
主要方法:
- 选择2,2,2-trifluoroethyl trifluoromethane sulfonate (TFSF) 作为稀释剂和二甲氧乙 (DME) 作为溶剂.
- 准备一个非易燃的LHCE系统.
- 分析溶解结构,Li+协调和阳离子在第一个溶解中的参与.
- 在激烈的条件下对Lithium Battery NCM811电池进行电化学测试.
主要成果:
- 证明TFSF和DME之间的键削弱了DME对Li+离子的协调.
- 观察到第一个溶解中的离子参与增加,导致聚合物 (AGG) 集群形成.
- 展示了无机固体/阴极电解质介面相 (SEI/CEI) 的形成.
- 实现了>80%的容量保留,平均99.8%的库伦比克效率超过230个循环.
结论:
- 结合相互作用对于设计有效的LHCE和控制相间形成至关重要.
- 基于TFSF/DME的非易燃LHCE系统使金属电池能够稳定高压运行.
- 这种方法为开发下一代储能设备的先进电解质提供了一条途径.
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