在立方氧化中通过分布控制离子导电性 Li6+P1-SiO5Cl
Alexandra Morscher1, Benjamin B Duff1,2, Guopeng Han1
1Department of Chemistry, University of Liverpool, Crown Street, L69 7ZDLiverpool, U.K.
Journal of the American Chemical Society
|November 22, 2022
概括
研究人员开发了一种新的氧化物 argyrodite,Li7SiO5Cl,用于离子运输. 用替代稳定了无序的结构,大大提高了固态应用的离子导电性.
科学领域:
- 材料科学
- 固态化学
- 电化学
背景情况:
- 矿结构对于离子传输材料至关重要,特别是基于硫化物的固态离子导体.
- 氧化石在很大程度上还未被探索,但仍有可能提高离子导电性和稳定性.
- 在 argyrodite 晶格中离子的分布对导电性产生了重大影响.
研究的目的:
- 合成和表征一种新的富氧化物 argyrodite, Li7SiO5Cl.
- 为了研究氧化物 argyrodite 的结构转换和位占用.
- 通过组合调来增强氧化中的离子导电性.
主要方法:
- 在不同温度下通过X射线衍射进行Li7SiO5Cl的结晶和结构分析.
- 合成Li6+xP1-xSixO5Cl固体溶液以稳定无序的结构.
- 作为组成和温度的函数的离子导电量测量.
主要成果:
- 一种新的丰富的立方氧化,Li7SiO5Cl,在室温下被确定为有序的P213结构.
- 在473K发生相位过渡到无序的F4̅3m结构,类似于超离子硫化物 argyrodites.
- 在Li6+xP1-xSixO5Cl中用P5+替换 (0.3 < x < 0.85) 在室温下稳定了无序的F4̅3m结构,在x = 0.75时达到1.82(1) × 10^-6 S cm^-1的最大离子导电率.
结论:
- 通过P替代稳定不整的F4̅3m结构显著增强了氧化物 argyrodites 的离子导电性.
- 与硫化物相比,开发的氧化物石具有更好的大气稳定性和金属兼容性.
- 组合控制为先进的应用提供了适合氧化材料的离子导电性的途径.
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