New iodide-based molten salt systems for high temperature molten salt batteries |
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Authors: | Syozo Fujiwara Fumio Kato Syouichiro Watanabe Minoru Inaba Akimasa Tasaka |
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Affiliation: | aTechnology Development Center, Energy Company, Panasonic Corporation, Matsushita-cho, Moriguchi, Osaka 570-8511, Japan;bDepartment of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan |
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Abstract: | Novel multi-component molten salt systems containing iodides, LiF–LiBr–LiI, LiF–NaBr–LiI, and LiF–LiCl–LiBr–LiI, were investigated for use as electrolytes in high temperature molten salt batteries to improve the discharge rate-capability. The iodide-based molten salts showed higher ionic conductivity ( 3 S cm−1 at 500 °C) than conventional LiCl–KCl, and had low enough melting points (below 400 °C) that can be used in practical high temperature molten salt batteries. The iodide-based salts showed instability at temperatures higher than 280 °C in dried air. The decomposition mechanism of iodide-based molten salts was discussed, and it was found that elimination of oxygen from the environment is effective to stabilize the iodide-based molten salts at high temperatures. |
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Keywords: | Molten salt Thermal battery Electrolyte Iodide |
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