| Project/Area Number |
09650910
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
工業物理化学
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| Research Institution | OSAKA CITY UNIVERSITY |
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Principal Investigator |
OHZUKU Tsutomu Department of Engineering, Osaka City University, Professor, 工学部, 教授 (40116439)
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| Co-Investigator(Kenkyū-buntansha) |
SAWAI Keijiro Department of Engineering, Osaka City University, Associate Professor, 工学部, 助教授 (50206017)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | electrochemistry / silicate glass / dilatometry / acoustic emission / lithium battery / insertion material / solid-state redox reaction |
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| Research Abstract |
Research directed toward the better understanding of anomalous behavior on solid-state redox reactions of lead-tin silicate glass was carried out in the fiscal year of 1997-1998. Since X-ray diffraction was featureless, new methods to visualize and follow the phenomena took place in a solid matrix were necessary. Therefore, we have intensively developed the following new methods :
(1) optical microscopy using optical microscope with CCD camera to see what are going on in a micrometer scale,
(2) acoustic emission histometry using in-situ electrochemical cells with acoustic sensor and transducer, which is designed and fabricated in our laboratory, to detect cracking sounds of lead-tin silicate glass particles, and
(3) dilatometry using home-made dilatometer with in-situ electrochemical cells which was designed to detect dimensional changes in 0.1 micrometer accuracy.
These new methods worked very well to visualize and characterize the anomalous behaviors of lead-tin silicate (or borate) glass. The methods were also applied to lithium insertion materials consisting of lithium, transition metal, and oxygen ions, and the results were compared with those from lead-tin silicate glass. According to our results, lead-tin silicate glass or borate glass can be applied to a negative electrode material for lithium ion batteries although some improvement would be needed to erase cracking sound by acoustic emission histometry.
As were stated above, we have successfully visualized phenomena which have not detect so far and gave useful information to materials chemists for advanced lithium batteries.
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