2007 Fiscal Year Final Research Report Summary
Development of ultra-thin-film batteries and capacitors
| Project/Area Number |
17206065
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MIYAYAMA Masaru The University of Tokyo, Research Center for Advanced Science and Technology, Professor (20134497)
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| Co-Investigator(Kenkyū-buntansha) |
NOGUCHI Yuji The University of Tokyo, Research Center for Advanced Science and Technology, Associate Professor (60293255)
SUZUKI Shinya The University of Tokyo, Research Center for Advanced Science and Technology, Assistant Professor (70396927)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Nanomaterials / Fuel cell / Capacitor / Protonic conductor / Layer-structured crystal |
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| Research Abstract |
Monolayer nanosheets were stacked on a conductive substrate, and electrochemical capacitances by lithium intercalation were evaluated. Capacitances close to the theoretical value were observed in titanate-nanosheet layers up to a thickness of 40 nm and manganate-nanosheet layers up to 10 nm. The capacitances decreased with increasing thickness above the critical thickness. Preparation of dense, flat-surface titanate-nanosheet layers up to 100 nm thickness was possible by use of electrophoretic deposition. A mixed-layer compound was synthesized by reassembly of titanate- and manganate- nanosheets. The compound showed new charge/discharge properties, which are not observed in single-component compounds.
Lithium-ion battery electrodes composed of restacked titanate-nanosheets and conductive carbon showed high-rate charge/discharge properties under large current densities. A composite electrode of porous carbon and manganate-nanosheet also showed high-rate properties with a power density above 1 kW/kg.
Proton-conductive membranes composed of sulfonated poly(ether ether ketone) and nanosheets delaminated from layered zirconium phosphate were prepared. Heat durability, water insolubility and high proton conductivity at 150℃ indicated the composite membrane to be a promising candidate for intermediate-temperature fuel cells.
Two perovskite nanosheets with different B-site cations were prepared, and mixed-layer compounds were synthesized by reassembly of these nanosheets. The compounds had a larger lattice parameter and smaller dielectric permittivity than those of randomly B-site oriented perovskite oxides. Nanosheet process was indicated to be effective to create dielectrics with novel structure and properties.
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Research Products
(159 results)
