Microstructural analyses of all-solid-state Li-S batteries using LiBH4-based solid electrolyte for prolonged cycle performance
Microstructural analyses of all-solid-state Li-S batteries using LiBH4-based solid electrolyte for prolonged cycle performance
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DOI：
10.1016/j.jechem.2020.03.069
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发表时间：
2020-11-01
影响因子：
13.1
通讯作者：
Orimo, Shin-ichi
中科院分区：
文献类型：
--
作者：
Kisu, Kazuaki;Kim, Sangryun;Orimo, Shin-ichi
复合氢化物材料由于与全固态电池中的锂金属负极具有良好的相容性而被广泛研究为潜在的固体电解质。然而，使用复杂氢化物的全固态电池的开发一直很困难，因为这些电池的循环寿命往往很短。通过对正极微观结构的分析，研究了Li-4(BH4)(3)I固体电解质对全固态锂硫电池(Li-S)的容量衰减机理。100次放电-充电循环后的横截面扫描电子显微镜观察表明，Li-4(BH4)(3)I电解液中出现了裂纹，阴极厚度增加。拉曼光谱表明，Li-4(BH4)(3)I固体电解质在循环过程中以恒定的速度分解。为了克服这些影响，通过增加正极中固体电解液的数量来提高锂S电池的循环寿命。(C)2020中科院科学出版社和大连化学物理研究所。由Elsevier B.V.和科学出版社出版。版权所有。
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 lithium- sulfur (Li-S) batteries using Li-4(BH4)(3)I solid electrolytes by analyzing the cathode microstructure. Crosssectional scanning electron microscopy observations after 100 discharge-charge cycles revealed crack formation in the Li-4(BH4)(3)I electrolyte and an increased cathode thickness. Raman spectroscopy indicated that decomposition of the Li-4(BH4)(3)I 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. (c) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.