Designing Ceramic/Polymer Composite as Highly Ionic Conductive Solid‐State Electrolytes

The design and fabrication of solid‐state electrolytes (SSEs) with high ionic conductivity is the most crucial obstacle for all‐solid‐state lithium batteries (ASSLBs). However, though polymer SSEs have the advantages of effective interfacial contact, polymer ASSLBs have not been able to deliver performance comparable to conventional lithium‐ion batteries (LIBs) due to slow ion transport within the polymer framework. In contrast, the high inherent ionic conductivity of ceramic SSEs is limited by the poor electrolyte/electrode interfacial contact. Therefore, the concept of ceramic/polymer composite electrolytes (C/PCEs) was proposed to combine the advantages of these two electrolytes and simultaneously overcome their weaknesses. This work reviews the recent progress in C/PCEs development according to the morphology of the ceramic components in C/PCEs. In this review, we investigate the inherent relationship between the structures of C/PCEs and the performance of the resultant SSEs, and subsequently conclude some general C/PCE design principles for future SSEs.