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Recent progress of composite solid polymer electrolytes for all-solid-state lithium metal batteries

Journal

CHINESE CHEMICAL LETTERS
Volume 32, Issue 9, Pages 2659-2678

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2021.03.032

Keywords

Composite solid polymer electrolyte; All-solid-state lithium battery; Ionic conductivity; Li+ transport; Electrochemical property

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Composite solid polymer electrolytes (CSPEs) are regarded as promising candidates for all-solid-state lithium batteries (ASSLBs) due to their higher ionic conductivity, better mechanical strength, and superior thermal/electrochemical stability. The type, morphology, and concentration of inorganic fillers have significant effects on the electrochemical performance of CSPEs in ASSLBs. Future research directions should focus on overcoming challenges to enhance the performance of high-performance CSPEs and ASSLBs.
In comparison with lithium-ion batteries (LIBs) with liquid electrolytes, all-solid-state lithium batteries (ASSLBs) have been considered as promising systems for future energy storage due to their safety and high energy density. As the pivotal component used in ASSLBs, composite solid polymer electrolytes (CSPEs), derived from the incorporation of inorganic fillers into solid polymer electrolytes (SPEs), exhibit higher ionic conductivity, better mechanical strength, and superior thermal/electrochemical stability compared to the single-component SPEs, which can significantly promote the electrochemical performance of ASSLBs. Herein, the recent advances of CSPEs applied in ASSLBs are presented. The effects of the category, morphology and concentration of inorganic fillers on the ionic conductivity, mechanical strength, electrochemical window, interfacial stability and possible Li+ transfer mechanism of CSPEs will be systematically discussed. Finally, the challenges and perspectives are proposed for the future development of high-performance CSPEs and ASSLBs. (C) 2021 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.

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