To address the limitations of contemporary lithium-ion batteries, particularly their low energy density and safety concerns, all-solid-state lithium batteries equipped with solid-state electrolytes have been identified as an up-and-coming alternative. Among the various SEs, organic–inorganic composite solid electrolytes (OICSEs) that combine the advantages of both polymer and inorganic materials demonstrate promising potential for large-scale applications. However, OICSEs still face many challenges in practical applications, such as low ionic conductivity and poor interfacial stability, which severely limit their applications. This review provides a comprehensive overview of recent research advancements in OICSEs. Specifically, the influence of inorganic fillers on the main functional parameters of OICSEs, including ionic conductivity, Li⁺ transfer number, mechanical strength, electrochemical stability, electronic conductivity, and thermal stability are systematically discussed. The lithium-ion conduction mechanism of OICSE is thoroughly analyzed and concluded from the microscopic perspective. Besides, the classic inorganic filler types, including both inert and active fillers, are categorized with special emphasis on the relationship between inorganic filler structure design and the electrochemical performance of OICSEs. Finally, the advanced characterization techniques relevant to OICSEs are summarized, and the challenges and perspectives on the future development of OICSEs are also highlighted for constructing superior ASSLBs.

为了解决当代锂离子电池的局限性，特别是能量密度低和安全问题，配备固态电解质的全固态锂电池已被认为是一种新兴的替代方案。在各种SE中，有机-无机复合固体电解质（OICSE）结合了聚合物和无机材料的优点，显示出大规模应用的广阔潜力。然而，OICSE在实际应用中仍然面临许多挑战，例如离子电导率低和界面稳定性差，严重限制了其应用。这篇综述全面概述了 OICSE 的最新研究进展。具体而言，系统讨论了无机填料对OICSEs主要功能参数的影响，包括离子电导率、Li ⁺转移数、机械强度、电化学稳定性、电子电导率和热稳定性。从微观角度对OICSE的锂离子传导机理进行了深入分析和总结。此外，对经典的无机填料类型（包括惰性填料和活性填料）进行了分类，特别强调无机填料结构设计与OICSE电化学性能之间的关系。最后，总结了与 OICSE 相关的先进表征技术，并强调了 OICSE 未来发展的挑战和前景，以构建优质的 ASSLB。