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设计和合成立方K_3-2 _x Ba_x SbSe₄ 固体电解质用于K-O₂电池

Jieren Shao¹, Huiling Ao¹, Lei Qin^1,2

¹Department of Chemistry and Biochemistry, The Ohio State University 100 West 18th Avenue, Columbus, OH, 43210, USA.

Advanced materials (Deerfield Beach, Fla.)

|September 11, 2023

概括

研究人员开发了一种新的固态电解质,用于更安全的电池. 在K3SbSe4中替代显著提高了导电性,并使室温稳定的氧电池成为可能.

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:

开发安全高效的离子导电固态电解质 (SSEs) 对于推进电池技术至关重要.
K3SbSe4化合物表现出三角形结构和低温相变,为离子导电性提供了潜力.

研究的目的:

为电池合成和表征一种基于石化的新型SSE.
研究替代对K3SbSe4.4的结构和导电性质的影响.
为了在室温氧电池中证明修改后的SSE的性能.

主要方法:

单晶结构分析以确定相位过渡.
用替代的K3SbSe4 (K3-2x Bax SbSe4) 的合成和表征.
电化学测试用于测量离子导电性.
使用SSE作为分离器的K-O2电池的组装和测试.

主要成果:

在50°C的低温下观察到K3SbSe4的三角形到立方形相变.
在K3SbSe4中的替代产生了空缺,扩大了格子参数,并诱导了立方相.
优化后的K2.2Ba0.4SbSe4在40°C达到0.1mS cm-1的最大导电率,比未使用的K3SbSe4.4高出两个数量级.
在室温K-O2电池中,SSE成功地起到了分离器的作用,保护了金属阳极.

结论:

替代是一种有效的策略,可以增强K3SbSe4 SSEs的离子导电性.
开发的SSE证明了基于的储能器件安全高效运行的潜力.
这项工作为开发下一代电池提供了有前途的材料.

关键词:

石灰化物固体电解质的电解质.晶体结构的结晶结构.离子导电性的离子导电性阶段过渡阶段过渡阶段过渡电池电池电池电池固态电解质固态电解质综合合成是一种合成.

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