实现超离子导电的无形氧化物
Shumin Zhang1, Feipeng Zhao1, Lo-Yueh Chang2
1Department of Mechanical and Materials Engineering, Western University, London, ON N6A 5B9, Canada.
Journal of the American Chemical Society
|January 29, 2024
概括
化物固体电解质 (SE) 中的无形成分对于全固态电池 (ASSB) 的快速离子导电至关重要. 将氧气纳入基于的化物 SE 产生无形结构,增强离子导电性和电池性能.
科学领域:
- 材料科学
- 电化学
- 固态化学
背景情况:
- 基于化物的固体电解质 (SE) 由于其离子导电性和电化学稳定性,对全固体电池 (ASSB) 是有前途的.
- 在化物SE中,特别是离子导电中,无形元件的作用仍未得到充分研究.
研究的目的:
- 研究机械化学制备的化物SE中常见的无形成分的存在和影响.
- 阐明局部化学在无形阶段和快速离子迁移之间的关系.
- 探索氧气结合对基于Zr的化物SE的无形化和性能的影响.
主要方法:
- 化的机械化学制备
- 用于结构分析的X射线吸收光谱 (XAS).
- 配对分布函数 (PDF) 的分析
- 反向蒙特卡洛 (RMC) 建模.
- 离子导电性测量
主要成果:
- 无形成分在机械化学合成的化物中普遍存在,并且与快速的离子运输有关.
- 将氧气纳入基于Zr的化物SE (例如,Li3ZrCl4O1.5) 诱导无形化,形成角共享Zr-O/Cl多面体.
- 这种独特的无形结构显著降低了离子运输能量障碍,在25°C时达到1.35±0.07×10-3 S cm-1的离子导电率.
- 通过氧气结合的无形化也提高了机械变形性和电化学性能.
结论:
- 无形相的存在和特定的局部化学作用对于优化离子导电在化中至关重要.
- 氧的结合为设计具有增强离子导电性,机械性质和电化学性能的无形化物SE提供了可行的策略.
- 这项研究为高性能ASSB的先进化物SE的合理设计提供了基本见解.
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