基于NaAlCl4和Na2ZnCl4的化物固体电解质的结构和离子导电性
Hao Guo1,2, Michael Häfner1,2, Helen Grüninger1,2
1Department of Biology, Chemistry and Earth Sciences, University of Bayreuth, Universitätstraße 30, 95447, Bayreuth, Germany.
概括
研究人员开发了新的基于的固态电解质 (SSE),用于更安全,更具成本效益的电池. 这些新型金属化物SSE显示出更好的离子导电性,这对于电网存储应用至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 固态化学 固态化学
背景情况:
- 基于的固态电池 (SSB) 为离子电池提供了一种安全且具有成本效益的替代方案,特别是用于电网存储.
- 开发具有高离子导电性的可持续固态电解质 (SSEs) 对于推进SSB技术至关重要.
- 金属化物SSE由于其离子导电性,电化学稳定性和可加工性而具有前景.
研究的目的:
- 研究基于NaAlCl4 (NAC) 和Na2ZnCl4 (NZC) 的新型SSE,其名义成分为Na1+xZnxAl1-xCl4.
- 探索这些材料的组成,晶体结构和离子导电性之间的关系.
- 为了证明这些SSE在固态电池工作中的潜力.
主要方法:
- 使用球磨法合成Na1+xZnxAl1-xCl4化合物.
- 使用X射线衍射 (XRD) 进行晶体结构的表征.
- 通过电化学阻抗光谱 (EIS) 测量离子导电性.
- 使用分子动力学 (MD) 模拟和核磁共振 (NMR) 的离子运输机制的研究.
主要成果:
- 确定了一种两相系统,其固体溶液在Na2ZnCl4型结构中延伸到大约34(3)%的Al替代.
- 在混合性间隙边缘 (x=0.625) 附近观察到最高的离子导电性 (1.5×10−5 S cm−1 在25 °C),明显超过纯NZC和NAC.
- 模拟MD和NMR揭示了Na+空缺在两个Na子网中的关键作用,以增强离子导电.
结论:
- 成功开发了一种基于Na2ZnCl4橄结构的新型SSE类.
- 这些SSE具有增强的离子导电性,使它们适合于固态电池.
- 该研究提供了对结构属性关系的基本见解,这些关系控制了金属化物SSEs中的离子导电.
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