| Project/Area Number |
10680482
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
エネルギー学一般
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
KATAGIRI Akira Kyoto University, Fac.Integreted Human Studies, Professor, 総合人間学部, 教授 (30026207)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1999: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1998: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Keywords | Beta-alumina / Aluminum chloride / Sodium / Secondary battery / Energy storage |
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| Research Abstract |
The cells of interest utilize sodium metal as the negative electrode active material, β-alumina solid electrolyte as the separator, and AlCl_3-NaCl melt plus sulfur (IV) chloride, iron (II) chloride, or nickel (II) chloride as the positive electrode active material, and are to be used for energy storage and electric vehicle propulsion. The aim of the present research was to elucidate the mechanism of polarization at the β-alumina and to analyze the mass transfer and current distribution in the positive electrode active material. Another objective was to obtain corrosion-resistant material for the positive electrode current collector and cell case by electrodeposition of tungsten metal.
First, polarization was measured in Na-S (IV) cells using β-alumina tube or disc. The polarization was asymmetric with respect to the direction of current ; large polarization occurred on the charging process. In order to explain the phenomena at the β-alumina/liquid electrolyte interface, a surface layer was assumed in which the transference number of Na^+ ion was less than 1. Transient and steady-state polarization can be explained. For the analysis of concentration and current distributions in the positive electrode active material, equations of ionic transport and an equation of potential derived from the electroneutrality were solved simultaneously. Electrodeposition of tungsten on the nickel substrate was attempted for obtaining corrosion resistant current collector and cell case. Coherent tungsten deposit was obtained in ZnCl_2-NaCl melt containing WO_3.
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