Analysis of Electrochemical Lithium Topochemical Reactions into Superstructure Spinel Oxides
Project/Area Number |
08455396
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
工業物理化学
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Research Institution | KYOTO UNIVERSITY |
Principal Investigator |
YAO Takeshi Graduate School of Energy Science, Kyoto Univ., Professor, エネルギー科学研究科, 教授 (50115953)
|
Co-Investigator(Kenkyū-buntansha) |
KAJIHARA Koichi Graduate School of Energy Science, Kyoto Univ., Instructor, エネルギー科学研究科, 助手 (90293927)
UCHIMOTO Yoshiharu Graduate School of Energy Science, Kyoto Univ., Associate Professor, エネルギー科学研究科, 助教授 (50193909)
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Project Period (FY) |
1996 – 1997
|
Project Status |
Completed (Fiscal Year 1997)
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Budget Amount *help |
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1997: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥5,500,000 (Direct Cost: ¥5,500,000)
|
Keywords | Lithium Batteries / Spinel / Crystal Structure / Cathode Material / スピネル型酸化物 / トポケミカル反応 / 構造解析 / X線回折 |
Research Abstract |
LiMn_2O_4 based spinel type oxides are one of the most promising cathode materials used in lithium ion batteries because their low cost, high theoretical energy density. In order to improve their cycle performance, several research groups have investigated the properties of manganese-substituted spionels of LiM_yMn_<2-y>O_4(M=Cr, Ni, Co, etc.). These spinels show a decreased capacity on the 4.1 V plateau, however improved cycle life was reported for Co, Ni, and Cr doped spinels. Furthermore, recently Co, Ni, and Cr doped spinels show reversible redox processes at potentials above 4.5 V.It is important to clarify the structural change, valency change during charge and discharge process in order to understand their electrochemical properties. In the present study, B-site doped spinels (LiM_yMn_<2-y>O_4 ; M=Cr, Ni, Co) were prepared. X-ray diffraction, X-ray absorption Fine Structure, and electrochemical studies were carried out.
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Report
(3 results)
Research Products
(5 results)