Solid-state batteries are seen as key to the development of safer and higher-energy-density batteries, by limiting flammability and enabling the use of the lithium metal anode, respectively. Composite polymer–ceramic electrolytes are a possible solution for their realization, by benefiting from the combined mechanical properties of the polymer electrolyte and the thermal stability and high conductivity of the ceramic electrolyte. In this study we used different liquid electrolyte chemistries as models for the polymer electrolytes, and evaluated the effect of adding a variety of porous and dense ceramic electrolytes on the conductivity. All the results could be modelled with the effective medium theory, allowing prediction of the conductivity of electrolyte combinations. We unambiguously determined that highly conductive porous particles act as insulators in such systems, whereas dense particles act as conductors, thereby advancing our understanding of composite electrolyte conductivity.

固态电池被视为开发更安全和更高能量密度电池的关键，分别通过限制可燃性和启用锂金属阳极。复合聚合物-陶瓷电解质是实现它们的可能解决方案，得益于聚合物电解质的综合机械性能以及陶瓷电解质的热稳定性和高导电性。在这项研究中，我们使用不同的液体电解质化学作为聚合物电解质的模型，并评估了添加各种多孔和致密陶瓷电解质对电导率的影响。所有结果都可以用有效介质理论建模，从而可以预测电解质组合的电导率。