| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
In present study, silicon and pyrocarbon was coated on the low crystalline carbon fibers as core carbon using chemical vapor deposition technique, and effect of the thin film silicon / pyrocarbon coating on electrochemical properties was examined.
Crystalline silicon was deposited on core carbon without the formation of SiC that was inert with lithium. Charge capacity (Li de-intercalation) of the pristine carbon fiber was successfully increased up to 1150 mAh/g by coating with 22 mass% silicon and 7 mass% pyrocarbon. Capacity fade was occurred during the charge-discharge cycling for the sample of carbon fiber coated with silicon only. Cycle ability was improved for the sample coated with both silicon and pyrocarbon. It is considered that thin pyrocarbon film is preferable for preventing the particle fracturing.
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