Lithium aluminum titanium phosphate (LATP) composite solid-state electrolytes: progress and prospects for all-solid-state batteries

Abstract

Composite solid-state electrolytes (CSEs) based on lithium aluminum titanium phosphate (LATP) have become a pivotal research direction for next-generation solid-state lithium batteries (SSLBs), owing to their high ionic conductivity and excellent environmental stability. Despite the advantages conferred by its NASICON-type structure, LATP exhibits inherent brittleness and poor interfacial compatibility. By combining LATP with flexible polymers, CSEs effectively integrate the high ionic conductivity of the ceramic phase with the superior processability and interfacial adaptability of the polymer matrix. This review highlights key strategies for enhancing the performance of CSEs, including optimization of filler morphology and content, surface modification, incorporation of plasticizers/ionic liquids, and application of in situ polymerization techniques. Particular attention is given to critical challenges such as mitigating side reactions between LATP and lithium metal, suppressing lithium dendrite growth, and improving compatibility with high-voltage cathodes. Finally, we propose that future efforts should focus on interfacial engineering, scalable manufacturing, and computational modeling to facilitate practical implementation.