| Project/Area Number |
05650679
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Structural/Functional materials
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| Research Institution | Nagasaki University |
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Principal Investigator |
SAKAMOTO Yoshiichi Nagasaki Univ., Fac. of Eng., Professor, 工学部, 教授 (50026019)
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| Co-Investigator(Kenkyū-buntansha) |
HIRATA Masahiro Nagasaki Univ., Fac.of Eng., Res.Asistant, 工学部, 助手 (30253636)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1993: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | Ni-MH battery / Charge-Discharge Characteristics / Co_3M (M=Transition metals) / Alkaline battery |
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| Research Abstract |
This study is concerned with the fundamentals on nickel-metal hydride batteries, the main results are summarized as follows :
1) A model for the electrode potential vs. time relationship during the charge/discharge processes for Pd hydride electrodes has been derived on the basis that the rate-determining step in the electrode reaction is the diffusion of hydrogen through the beta, (alpha+beta) and alpha phases, in addition to the charge transfer at the hydride/electrolyte interface. The calculated electrode potential vs. time curves are in a reasonable agreement with the experimental results.
2) The electrochemical hydrogen charge-discharge properties of pure Pd, Pd-Rh, Pd-Ni alloys have been investigated for the negative electrode of Ni-MH battery. The discharge capacity of Pd-Rh hydrides increases with increasing Rh content from about 195 mAhg^<-1> for pure Pd. The capacity of Pd-7.5 at.% Rh alloy was about 215 mAhg^<-1>
3) The charge-discharge characteristics of a series of Co_3Mo compound powder electrodes has been investigated at 303 K as possible active materials for a negative electrode in alkaline nickel oxide batteries. The new battery is expressed by cobalt oxidation and nickel oxyhydroxide reduction for an overall battery discharge reaction : Co + 2NiOOH +2H_2O*Co (OH) _2 + 2Ni (OH) _2 with E_<cell> =1.22 V.
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