2010 Fiscal Year Final Research Report
Electrochemical property of composite of gamma-ferric oxide and carbon as rapidly dischargeable and chargeable batteries.
| Project/Area Number |
20360430
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Energy engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
HIBINO Mitsuhiro Kyoto University, エネルギー科学研究科, 准教授 (20270910)
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| Co-Investigator(Kenkyū-buntansha) |
YAO Takeshi 京都大学, エネルギー科学研究科, 教授 (50115953)
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| Project Period (FY) |
2008 – 2010
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| Keywords | リチウムイオン電池 / 正極材料 / 高速充放電 / 酸化鉄 / 複合体電極 / 水溶液法 / 電気化学キャパシタ |
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| Research Abstract |
A composite of γ-Fe_2O_3 and ketjenblack was successfully fabricated to exhibite 125mA hg^<-1> of specific capacity in rapidly discharging and charging at the current density of 10A g^<-1>. From ac-impedance measurements the contribution of a faradaic reaction and a non-faradaic reaction, which forms electric double layer, to observed total capacity was separately estimated. At the same time, chemical diffusion coefficient of lithium in γ-Fe_2O_3 was also determined. Furthermore, γ-Fe_2O_3 was found to serve as an active material originating pseudo-capacitance for a cathode of electrochemical capacitors.
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