2018 Fiscal Year Final Research Report
Studies on photoelectrochemical lithium insertion/desertion reactions
| Project/Area Number |
16K05929
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Inorganic industrial materials
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Research Collaborator |
Kanno Ryoji
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | 電気化学材料 / 半導体光電極 / インターカレーション / リチウム電池 / 全固体電池 |
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| Outline of Final Research Achievements |
Photoelectrochemical lithium (de)intercalation has been demonstrated structural and electrochemical analyses using epitaxial film model electrodes. Energy band diagrams at the TiO2/organic electrolyte, MoO3/organic electrolyte, and TiO2/Li3PO4 solid electrolyte were investigated, which clarified that the photoelectrochemical activity of lithium ions are related to flat band potential and intercalation potentials. At the TiO2/Li3PO4 interface, the irradiated TiO2 electrode exhibited a higher reversible capacity than that the unirradiated electrode and showed superior cycle stability. Further understanding of photoelectrochemical lithium intercalation at the solid/solid interfaces, photoelectrochemical storage devices are expected to be realized.
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| Free Research Field |
固体化学，電気化学
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| Academic Significance and Societal Importance of the Research Achievements |
光エネルギーを有効活用したエネルギー変換の重要性は高まり続けるが，固体内のイオンの移動や貯蔵に着目した事例は少ない．本研究では，電極・固体電解質界面に光照射し，n型半導体側で光励起した正孔が，リチウムイオンの脱挿入に関与できることを実験的に明らかにすることができた．全固体電池で固体固体界面での電気化学現象が注目を集めているなか，固体イオニクスの新たな展開が期待できる点で学術的，社会的に意義があると考える．
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