| Budget Amount *help |
¥20,800,000 (Direct Cost: ¥16,000,000、Indirect Cost: ¥4,800,000)
Fiscal Year 2015: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Fiscal Year 2013: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
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| Outline of Final Research Achievements |
The improvement effects of nanoconfinement on the de/re-hydrogenation of LiBH4 and 0.68LiBH4－0.32Ca(BH4)2 were systematically investigated. It was found that the 1st dehydrogenation temperature was reduced by the nanoconfinement, whereas such effect disappeared from the 2nd cycle. Anhydrous M(B12H12)n/2, the dehydrogenation intermediate of M(BH4)n was successfully synthesized by sintering of M(BH4)n and B10H14 with stoichiometric molar ratio. Thermal decomposition of M(B12H12)n/2 was proved to proceed in 2 steps, i.e. 1) formation of hydrogen deficient [B12H12-x]n- and 2) formation of polymer comprised of [BxHy]n-. M(B12H12)n/2 was found to exhibit superionic conductivity at its high temperature phase. For example, the ionic conductivity of LiNaB12H12 at 550 K reaches 0.79 S/cm, which is approximately 8 times higher than that of Na2B12H12 and 11 times higher than that of Li2B12H12, suggesting the high potentiality of M(B12H12)n/2 as solid electrolyte.
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