解码结构性障碍,合成方法,和短距离和长距离的离子运输在阿吉罗底石 (Li6-PS5-Br1+) 中
Hanan Al-Kutubi1, Ajay Gautam1, Anastasia K Lavrinenko1
1Storage of Electrochemical Energy, Department of Radiation Science and Technology, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands.
Chemistry of materials : a publication of the American Chemical Society
|February 17, 2025
概括
改变Li6- PS5- Br1+固体电解质的合成方法会显著影响离子导电性. 配置和冷却方法揭示了不同尺度上的混乱,化学组成和离子运动之间的复杂关系.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 电化学 电化学 电化学
背景情况:
- 固体电解质中的离子导电性对于先进的电池技术至关重要.
- 了解化学成分,结构障碍和离子动态之间的相互作用是优化性能的关键.
- 以前的研究经常将导电性与简单位点障碍联系起来,可能忽略了其他有助于因素.
研究的目的:
- 解开位点乱和化学成分对Li6-PS5-Br固体电解质的离子导电性的影响.
- 研究合成路径,特别是冷却方法对结构性和动态性质的影响.
- 建立一个更全面的理解,控制离子运输的因素.
主要方法:
- 合成Li6- PS5- Br1+ (x = 0,0.3,0.5) 具有不同的含量和冷却速度 (缓慢冷却与冷却冷却).
- 固态核磁共振 (NMR) 光谱 (7Li和31P) 用于探测化学环境和短距离离子动态.
- 用于结构分析的中子衍射和用于长距离导电性测量的电化学阻抗光谱 (EIS).
主要成果:
- 冷却方法显著改变了7Li和31P环境,表明影响超出了简单的4d位点障碍.
- 配置 (Sconf) 作为结构障碍的更好的描述者,与和环境扭曲相关.
- 短距离离子运动的增加 (通过NMR) 与Sconf相关,但这种关系在火冷却样本中与远距离导电性 (通过EIS) 相反.
结论:
- 改变合成参数,如冷却速度,深刻地改变了结构障碍和动态之间的关系.
- 化学成分和结构障碍的描述因素是影响不同长度尺度的导电性的不同因素.
- 这项研究挑战了增加短距离扩散率直接转化为增加长距离扩散率的假设,突出了晶格软度和声离子相互作用的作用.
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