电解质
快离子导体
离子电导率
电导率
离子键合
材料科学
离子
化学物理
陶瓷
组态熵
化学
热力学
物理化学
电极
有机化学
物理
复合材料
作者
Jiaping Lin,Mareen Schaller,Sylvio Indris,Volodymyr Baran,Ajay Gautam,Jürgen Janek,Aleksandr Kondrakov,Torsten Brezesinski,Florian Strauss
标识
DOI:10.1002/anie.202404874
摘要
The development of improved solid electrolytes (SEs) plays a crucial role in the advancement of bulk‐type solid‐state battery (SSB) technologies. Recently, multicomponent or high‐entropy SEs are gaining increased attention for their advantageous charge transport and (electro)chemical properties. However, a comprehensive understanding of how configurational entropy affects ionic conductivity is largely lacking. Herein we have investigated a series of multication‐substituted lithium argyrodites with the general formula Li6+x[M1aM2bM3cM4d]S5I, with M being P, Si, Ge, and Sb. Structure‐property relationships related to ion mobility were probed using a combination of diffraction techniques, solid‐state nuclear magnetic resonance spectroscopy, and charge‐transport measurements. We present, to the best of our knowledge, the first experimental evidence of a direct correlation between occupational disorder in the cationic host lattice and lithium transport. By controlling the configurational entropy through the composition, high bulk ionic conductivities up to 18 mS cm−1 at room temperature were achieved for optimized lithium argyrodite compositions. Our results indicate the possibility of improving ionic conductivity in ceramic ion conductors via entropy engineering, unlocking the compositional limitations for the design of advanced electrolytes and opening up new avenues in the field.
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