全固态电池的化物超导体:合成和组成对离子导电性的影响
Shuhao Yang1, Se Young Kim1, Guoying Chen1
1Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
概括
化物超离子导体的缺陷工程,如Li3YCl6,增强了全固态电池的离子导电性. 这项研究表明,定制的非静态度和机械化学合成释放了更高的Li + 载体度和更低的迁移障碍,改善了电池性能.
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:
- 化物超离子导体,如Li3YCl6,由于它们的高压稳定性,对全固态电池 (ASSB) 是有前途的固体电解质材料.
- 之前的研究表明,非静态测量或机械化学合成可以显著增加Li3YCl6的离子导电性,但潜在的机制仍然不清楚.
研究的目的:
- 阐明在缺陷工程Li3YCl6.6中增强的离子导电性背后的机制.
- 为了将静态度,晶体结构,合成条件,Li+载体度和迁移障碍与离子导电性相关联.
- 为了确定新型化物组合物,在ASSB中具有优越的性能.
主要方法:
- 利用阻抗光谱的跳动频率分析来研究结构-属性关系.
- 通过固态 (SS) 和机械化学 (MC) 方法合成Li3-3xY1+xCl6,包括含有缺陷的样本 (0 < x < 0.17).
- 在ASSB电池中用LiNi0.8Mn0.1Co0.1O2 (NMC811) 阴极评估合成材料的离子导电性和循环性能.
主要成果:
- 证明了含有缺陷的SS-Li3-3xY1+xCl6和MC-Li3-3xY1+xCl6中的移动Li+载体被热激活,它们的度取决于温度.
- 表明,增强的离子导电性来自增加Li+载体度和减少迁移能量障碍的协同效应.
- 在ASSB中发现了一种新的非静态态化物Li2.61Y1.13Cl6,具有最高的离子导电率 (0.47 mS cm-1) 和出色的循环稳定性 (在1000个循环后~90%的容量保留).
结论:
- 这项研究阐明了在缺陷工程化物超离子导体中被困的Li+离子的热激活过程.
- 定制立体测量和合成方法对于优化Li+载体度和迁移动态至关重要.
- 这些发现为设计下一代固体电解质用于高性能全固态电池提供了宝贵的见解.
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