|Budget Amount *help
¥45,500,000 (Direct Cost: ¥35,000,000、Indirect Cost: ¥10,500,000)
Fiscal Year 2012: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2011: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2010: ¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000)
Fiscal Year 2009: ¥20,150,000 (Direct Cost: ¥15,500,000、Indirect Cost: ¥4,650,000)
Glass-ceramic Li_2S-P_2S_5 electrolytes with a high conductivity of over 5×10^<-3>S cm^<-1>at room temperature were prepared by optimizing preparation conditions of mother glasses, crystallization conditions, glass compositions. Chemical stability of sulfide electrolytes under exposure to air atmosphere was evaluated. The electrolyte with 75 mol% Li_2S showed the highest chemical stability in the binary system Li_2S-P_2S_5. Furthermore, the addition of metal oxides as H_2S absorbents was effective in reducing H_2S gas generation from the electrolytes. All-solid-state In / LiCoO_2 cells with the prepared electrolytes operated as secondary batteries with good cyclability.