| Project/Area Number |
15K21166
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Inorganic industrial materials
Device related chemistry
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| Research Institution | Tottori University |
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Principal Investigator |
Domi Yasuhiro 鳥取大学, 工学(系)研究科(研究院), 助教 (50576717)
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| Research Collaborator |
SAKAGUCHI Hiroki
USUI Hiroyuki
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | リチウム二次電池 / ケイ素負極 / ラマン分光 / その場測定 / 相変化 |
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| Outline of Final Research Achievements |
Silicon (Si) is an attractive material for use as a negative electrode in next-generation LIBs due to its high theoretical capacity compared to that of graphite, which is used currently. In this study, a reaction mechanism of Si is elucidated using Raman spectroscopy. Crystalline Si (c-Si) has a triply degenerated Raman active mode at 520 cm-1. c-Si transforms into amorphous Si (a-Si) after charge-discharge cycles, and a-Si shows Raman peak at 490 cm-1. Utilizing this phenomena, a distribution of lithiation-delithiation reaction with Si was investigated. In organic electrolytes, c-Si that has not reacted with Li was unevenly distributed on the electrode; Li storage into the Si electrode proceeded locally in limited area. In ionic liquid electrolytes, on the other hand, the domain of a-Si was homogeneously distributed on the surface, which indicates that Li ion was uniformly stored into the entire Si electrode surface. There results were quantitatively confirmed at large area.
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