| Project/Area Number |
06555188
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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 | 試験 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | SAGA UNIVERSITY |
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Principal Investigator |
MASAKI Yoshio SAGA UNIVERSITY FACULTY OF SCIENCE & ENGINEERING,PROFESSOR, 理工学部, 教授 (60037885)
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| Co-Investigator(Kenkyū-buntansha) |
ISONO Ken-ichi SAGA UNIVERSITY FACULTY OF SCIENCE & ENGINEERING,RESEARCH ASSOCIATE, 理工学部, 助手 (20232374)
NOGUCHI Hideyuki SAGA UNIVERSITY FACULTY OF SCIENCE & ENGINEERING,ASSOCIATE PROFESSOR, 理工学部, 助教授 (60093978)
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| Project Period (FY) |
1994 – 1996
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| Keywords | LITHIUM ION BATTERY / CATHODE MATERIAL / MANGANESE / SPINEL STRUCTURE / MELT-IMPREGNATION METHOD / CYCLABILITY / HIGH TEMPERATURE PERFORMANCE / LITHIUM-MANGANESE OXIDE |
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| Research Abstract |
We have developed the preparation procedures of cathode materials (Lithium-Manganese oxides) for lithium-ion batteries by melt-impregnation method developed us. Two types of material, 1) spinel Li_xMn_yO_4 and 2) Li_<0.33>MnO_2, were mainly studied. The obtained important results are as follows ; a) The preparation method (melt-impregnation method) for spinel Li_xMn_yO_4 excellent as cathode in lithium secondary batteries has been established. We found that the oxygen content of spinel Li_xMn_yO_4 was easily controlled by the introduction of nitrogen gas. b) The relation between the spinel formula of Li_xMn_yO_4 and its battery performance is initially clarified. Based on the spinel formula, spinel compounds are divided into two groups, oxygen rich and lithium rich spinel. These words proposed us become popular gradually among battery researchers. c) The mechanism of capacity fading in spinel Li_xMn_yO_4 cathode at room temperature and higher temperature (50>ﾟC) are clarified. d) Lithium-manganese oxide formed at less than 400ﾟC is proofed to be new material, Li_<0.33>MnO_2. The optimum condition for the preparation of it with excellent battery performance is determined.
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