| Project/Area Number |
07555190
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | Hokkaido University |
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Principal Investigator |
INAGAKI Michio Hokkaido Univ., Graduate School of Eng., Prof., 大学院・工学研究科, 教授 (20023054)
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| Co-Investigator(Kenkyū-buntansha) |
HIGUCHI Shunichi National Res.Inst.Osaka, Group Leader, 研究室長(研究職)
SHIMIZU Akira Hokkaido Univ., Graduate School of Eng., Assitant, 大学院・工学研究科, 助手 (90002013)
KONNO Hidetaka Hokkaido Univ., Graduate School of Eng., Ass.Prof., 大学院・工学研究科, 助教授 (50002316)
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| Project Period (FY) |
1995 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥23,400,000 (Direct Cost: ¥23,400,000)
Fiscal Year 1997: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1995: ¥19,100,000 (Direct Cost: ¥19,100,000)
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| Keywords | Lithium secondary batteries / Cathode Materials / Oxides / Anode Materialls / carbon Materials / Capacity / Crystallinity / リチウム電池 / 電極材料 / ソフトプロセス / LiMn_2O_4 / Li(Ni_<0.5>Co_<0.5>)O_2 / 正極 / 負極 / V_2O_5 |
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| Research Abstract |
The purposes of this project are to develop a soft process for synthsis (a simple procedure at low temperature as room temperature) of electrode materials of cathode and anode of lithium secondary batteries and to understand the dependence of battery performance on crystalolinity of electrode materials.
l) Synthesis of cathode materials and effect of crystallinity on battery performance : lithium-transition metal double oxides were successfully synthsized via tartarates of respective metal ions at low temperatures as 300ﾟC.The reaction products had poor crystallinity and so a wide range of crystallinity was obtained by annealing them at high temperatures. The battery performance, for example capacity, was found to depend strongly on the crystalliniti of cathode materials. For the transition metal oxides, such as V_2O_5, MoO_3 qand TiO_2, on the other hand, battery capacity did not show a marked dependence on their crystallinity
2) Synthesis of carbon materials for anode and their battery performance : Anode performance is know to be governed by the intercalation process of lithium into carbon materials. The recent results on intercalation of alkali metals into carbon materials are reviewed. The boron doping into carbon materials was found to be effective to improve the crystallinity of carbon materials and, as a consequence, to improve the capacity of the batteries.
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