Abstract
In this study, Li–S batteries were fabricated using 9(15NaI∙NaBH4)∙LiI as the solid electrolyte, and their charge–discharge properties were investigated. The composition of the cathode, consisting of sulfur, solid electrolyte, and carbon, was optimized from the viewpoint of microstructure and charge–discharge performance. For the cathode composite with sulfur, solid electrolyte, and carbon in a weight ratio of 2:7:1, an initial discharge capacity of 1480 mAh/g was obtained, and 760 mAh/g was maintained for the subsequent cycles at 0.006 C. The discharge capacities did not change significantly when the discharge rate was increased to 0.03 C. This indicates that the overvoltage originates mainly from the IR drop of the solid electrolyte at a low rate. On the other hand, the discharge capacity was dropped to 380 mAh/g at 0.06 C, which could be due to insufficient electronic conduction in the composite and/or the homogeneity of the composite. This is a pioneering study of the functioning of a Na-compound-based Li+ conductor as a solid electrolyte for Li–S batteries. The results of this study show the potential of the all-solid-state Li–S battery using the Li+-doped Na compound as the solid electrolyte and strongly indicate that a suitable solid electrolyte for Li–S batteries can be developed from the existing Na compounds.
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Acknowledgements
This work was supported by the JSPS KAKENHI grant numbers JP22H02179, JP22K04871, and the Naito Science & Engineering Foundation. The FIB-SEM observation and EDS analyses were supported by the Equipment Sharing Division, Organization for Co-Creation Research and Social Contributions, Nagoya Institute of Technology.
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Miyazaki, R., Onishi, K. & Hihara, T. Charge–discharge performances of Li–S battery using NaI–NaBH4–LiI solid electrolyte. J Solid State Electrochem 27, 1195–1201 (2023). https://doi.org/10.1007/s10008-023-05437-6
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DOI: https://doi.org/10.1007/s10008-023-05437-6