使用局部高度电解质的金属电池的运输号码确定和相关性
Hafiz Ahmad Ishfaq1,2,3, Carolina Cruz Cardona4, Elena Tchernychova1
1Department of Materials Chemistry, National Institute of Chemistry, Hajdrihova 19, Ljubljana 1000, Slovenia.
概括
高运输数并不保证金属电池的性能. 与阳极的界面稳定性比批量电解质特性更为关键,对于电池的寿命.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 局部高度缩的电解质 (LHCE) 对金属电池 (LMB) 是有前途的.
- 像TFEE这样的化乙烯为LHCE提供了潜在的溶剂选择.
- 了解电解质特性及其与电池性能的相关性至关重要.
研究的目的:
- 用DOL和DME溶剂确定基于TFEE的LHCE的运输数.
- 评估这些电解质在LMBs中的性能和稳定性.
- 阐明在LMBs中控制电解质性能的因素.
主要方法:
- 分子动力学模拟的模拟.
- 核磁共振光谱学 核磁共振光谱学
- 布鲁斯-文森特的方法
- 电化学阻抗光谱学 (EIS) 是一种电化学阻抗光谱技术.
- 扫描电子显微镜 (SEM) 的使用
- 在X射线光电子光谱学 (XPS) 中.
主要成果:
- TFEE-DOL LHCE显示出高运输数 (0.65),但稳定性差,库伦比效率低 (<90%) 与金属相比.
- 尽管运输数量较低 (0.25),但TFEE-DME LHCE表现出高库伦比效率 (98.9%) 和稳定性.
- 在TFEE-DOL系统中,EIS透露了通过固体电解质间相 (SEI) 显著的迁移阻力.
结论:
- 金属阳极的接口特性对LMB性能比散装电解质运输更为关键.
- 建议将重点放在Li金属阳极的全 (操作) 阻抗光谱上,以表征相间层.
- 对于LMB的电解质设计,应优先考虑阳极接口稳定性,而不是大量的散装运输数量.
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