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Complex hydride materials have been widely investigated as potential solid electrolytes because they have good compatibility with the lithium metal anodes used in all-solid-state batteries.However,the development of all-solid-state batteries utilizing complex hydrides has been difficult as these cells tend to have short cycle lives.This study investigated the capacity fading mechanism of all-solid-state lithiumsulfur (Li-S) batteries using Li4(BH4)3I solid electrolytes by analyzing the cathode microstructure.Crosssectional scanning electron microscopy observations after 100 discharge-charge cycles revealed crack formation in the Li4(BH4)3I electrolyte and an increased cathode thickness.Raman spectroscopy indicated that decomposition of the Li4(BH4)3I solid electrolyte occurred at a constant rate during the cycling tests.To combat these effects,the cycle life of Li-S batteries was improved by increasing the amount of solid electrolyte in the cathode.