| Budget Amount *help |
¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2016: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
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| Outline of Final Research Achievements |
Improvement of cycle life of Si negative electrodes is necessary to apply to practical lithium-ion batteries with large capacities. An artificial surface layer was formed on Si film electrodes to inhibit reductive decomposition of an electrolyte, and its effects on electrochemical properties were investigated. The charge/discharge efficiency of the Si electrode was improved by coating with lithium fluoride (LiF). Changes in the surface morphology of the Si electrode with potential sweeping were investigated using in-situ AFM. Although large amount of surface deposits originating from electrolyte decomposition emerged on the bare-Si electrode, few surface deposits were observed on the LiF-coated Si electrode. It is clear that LiF is one important component of the surface layer to inhibit electrolyte decomposition on Si negative electrodes.
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