高度LiPF6/硫电解质:结构,运输特性和电池应用
Yosuke Ugata1,2, Yichuan Chen1, Shuhei Miyazaki1
1Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan. dokko-kaoru-js@ynu.ac.jp.
Physical chemistry chemical physics : PCCP
|October 25, 2023
概括
这项研究探讨了六酸 (LiPF6) 在硫基高度电解质 (HCE) 中用于先进的电池. 有希望的结果显示,在特定的三元混合物中,+离子的运输速度更快,从而提高了电池的性能.
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:
- 硫溶剂提供不易燃性和氧化稳定性,对于高压电池至关重要.
- 基于硫烯的高度电解质 (HCE) 显示出高的Li+离子转移数.
- 在硫基HCE中,LiPF6作为初级盐的使用在很大程度上仍未被探索.
研究的目的:
- 为了研究LiPF6在二元和三元硫混合物中的相位行为,溶盐结构和运输特性.
- 评估基于硫的HCE与LiPF6的潜力,以提高Li电池的性能.
主要方法:
- 系统地调查含有LiPF6和硫溶剂的混合物:硫 (SL),二甲基硫 (DMS),乙基甲基硫 (EMS) 和3-甲基硫 (MSL).
- 分析相位行为和溶解物结构.
- 利用拉曼光谱学研究三元混合物的离子协调和解离.
主要成果:
- 在LiPF6/SL和LiPF6/DMS二元混合物中形成稳定的晶体盐酸盐 (Li(SL) 4PF6和Li(DMS) 2.5PF6).
- LiPF6/EMS,LiPF6/MSL和某些三元混合物在广泛的温度范围内保持液态.
- 在HCE[LiPF6]/[SL]/[DMS]=1/2/2中,Li+离子由于连接体交换而表现出比PF6-更快的扩散,导致更高的Li+转移数.
结论:
- 基于硫的HCEs与LiPF6是可行的Li电池,与特定的组成显示增强Li+运输.
- 硫溶剂对Li+的竞争性协调影响三元混合物中的LiPF6解离.
- 与传统电解质相比,研究的HCE具有较高Li+转移数的潜力.
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