| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
The electrochemical interfaces between intercalation electrodes and organic electrolytes were investigated by in-situ neutron reflectometry using epitaxial-film model electrodes. The depth profile of the scattering length density as determined by neutron reflectometry clarifies the ionic distribution at the interface owing to high sensitivity of lithium ions. A phase transition occurs in the surface 20 nm region of the film electrodes from the top surface, and the reconstructed phase determines electrochemical properties during the subsequent cycles. Using neutron reflectometry, X-ray diffractometry, and X-ray photoelectron spectroscopy in combination, it is found that the surface structures and electrochemical properties can be controlled by surface modification. Direct observation and control of the interfacial structure is an effective way of developing intercalation materials with high capacity, high power, and high stability.
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