リチウム空気二次電池のためのナノ構造制御した新規空気極触媒
| Project/Area Number |
13J05495
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 国内 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Kyushu University |
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Principal Investigator |
張 一讚 (2014) 九州大学, 工学研究院, 特別研究員(PD)
張 一讃 (2013) 九州大学, 統合新領域・オートモーティブサイエンス, 特別研究員(DC2)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Li air battery / Li metal anode / Li-air batteries / Cyeleability / Nanotube array / Li utilization |
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| Outline of Annual Research Achievements |
In my research period, to improve the cycleability of Li-O2 battery, I had tried to synthesize the 1D MnO2 nanotube array. Improved cycle retention could be obtained, but capacity needed to be increased. One of ways is CNT substrate in cathode material especially single wall carbon nanotube. In our early research, we confirmed that β-MnO2 could significantly reduce over-potential for OER(oxygen evolution reaction). Provided that CNT having proper nanoscale dimensions and architectures is covered well with catalysis β-MnO2, then improved cycle stability with increased capacity will be obtained.Much improved cycle stability with reasonably high capacity is obtained.
Another issue which makes a major contribution to poor stability on cycling is the Li metal anode in Li-O2 cell. In last year, we elucidated critical importance of Li anode on cycle performance in Li-O2 battery. As a solution, we proposed polymer coating on Li metal with poly(vinylidene fluoride-co-hexafluoropropylene). Capacity fading is much higher with increasing Li utilization; however, it was found that coating the Li metal with PVdF-HFP highly and effectively increased the cycle stability of a Li-O2 battery. This indicates that the coating may prevent shape changes of the metal during discharge and charge cycles. Furthermore, addition of inorganic carbon MAGD graphite on PVdF-HFP coating layer improved electrochemical performance significantly than only PVdF-HFP layer. Because MAGD can intercalate Li+ ion into the lattice, easier movement would result in increased conductivity.
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| Research Progress Status |
26年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
26年度が最終年度であるため、記入しない。
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Report
(2 results)
Research Products
(7 results)
