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Composite solid electrolytes for all-solid-state lithium batteries

机译：全固态锂电池用复合固体电解质

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摘要

Compared to currently used liquid-electrolyte lithium batteries, all-solid-state lithium batteries are safer and possess longer cycle life and have less requirements on packaging and state-of-charge monitoring circuits. Among various types of solid electrolytes, composite solid electrolytes, which are composed of active or passive inorganic fillers and polymer matrices, have been considered as promising electrolyte candidates for all-solid-state lithium batteries. Incorporation of inorganic fillers into the polymer matrices has been demonstrated as an effective method to achieve high ionic conductivity and excellent interfacial contact with the electrodes. In this review article, we first summarize the historical development of composite solid electrolytes. Contribution of both inert inorganic fillers and active Li-ion conductors to the ionic conductivity, electrochemical stability, and mechanical properties of the composite solid electrolytes are elaborated. Possible mechanisms of conductivity enhancement by inorganic fillers are broadly discussed. Examples of different composite solid electrolyte design concepts, such as inorganic nanoparticle/polymer, inorganic nanofiber/polymer, and other inorganic/polymer composite solid electrolytes, are introduced and their advantages and disadvantages are discussed. Inorganic filler/polymer composite solid electrolytes studied for use in various Li battery systems including Li-ion, Li-sulfur, and Li-metal batteries are evaluated. Promising designs of composite solid electrolytes and cathode materials used in all-solid-state Li batteries are also introduced. Finally, future perspectives on current requirements of composite solid electrolyte technologies are highlighted.
机译：与目前使用的液体电解质锂电池相比，全固态锂电池更安全，循环寿命更长，并且对包装和荷电状态监控电路的要求更低。在各种类型的固体电解质中，由活性或无源无机填料和聚合物基体组成的复合固体电解质已被认为是全固态锂电池的有希望的候选电解质。已证明将无机填料掺入聚合物基体是获得高离子电导率和与电极的极佳界面接触的有效方法。在这篇综述文章中，我们首先总结了复合固体电解质的历史发展。阐述了惰性无机填料和活性锂离子导体对复合固体电解质的离子电导率，电化学稳定性和机械性能的贡献。广泛讨论了通过无机填料提高电导率的可能机理。介绍了不同复合固体电解质设计概念的示例，例如无机纳米颗粒/聚合物，无机纳米纤维/聚合物和其他无机/聚合物复合固体电解质，并讨论了它们的优缺点。评估了研究用于各种锂电池系统（包括锂离子，锂硫和锂金属电池）的无机填料/聚合物复合固体电解质。还介绍了用于全固态锂电池的复合固体电解质和正极材料的有前途的设计。最后，强调了对复合固体电解质技术当前需求的未来观点。

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