Li1.6AlCl3.4S0.6:用于固态电池的低成本和高性能固体电解质
Tej P Poudel1,2,3, Ifeoluwa P Oyekunle2,3, Michael J Deck2,3
1Materials Science and Engineering Program, The Graduate School, Florida State University 2005 Levy Ave. Tallahassee FL 32310 USA yhu@fsu.edu.
研究人员开发了一种新的固体电解质,酸 (Li1.6AlCl3.4S0.6),使用简单的削工艺. 这种材料显著提高了下一代全固态电池的离子导电性.
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:
- 固体电解质 (SE) 对先进的可充电电池至关重要,但在成本,可扩展性和离子导电性方面存在局限性.
- 四氨基酸盐具有成本效益,但具有较低的Li+导电性和高的激活能量.
- 开发高性能,经济的SE对于将全固态电池 (ASSB) 商业化至关重要.
研究的目的:
- 为了合成一种新合金合金合物固体电解质,提高了离子导电性.
- 研究新材料的结构和运输特性.
- 评估开发的SE在全固态电池应用中的性能.
主要方法:
- 从廉价的前体中单阶段机械化学炼合成合金合物 (Li1.6AlCl3.4S0.6).
- 使用高分辨率X射线衍射 (XRD) 和6Li神奇角旋转 (MAS) NMR光谱进行了表征.
- 使用初始分子动力学 (AIMD) 模拟的计算分析.
主要成果:
- 在25°C时实现了离子导电性从LiAlCl4的0.008 mS cm-1显著增加到Li1.6AlCl3.4S0.6的0.18 mS cm-1.
- 结构分析显示了四面体协调的LiCl-S八面体,促进了3DLi+运输.
- AIMD模拟证实了一个增强的3D Li+迁移网络,扩散率增加.
- 所有固态电池半电池都表现出高速率和稳定的循环性能.
结论:
- 合成的Li1.6AlCl3.4S0.6固体电解质提供了一种具有增强离子导电性的经济有效的解决方案.
- 混合Cl-S离子子网和由此产生的结构特征促进了高效的3D Li+运输.
- 这种材料显示出高性能和稳定的全固态电池的巨大潜力.
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