| Project/Area Number |
15H03882
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Device related chemistry
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
KUBUKI Shiro 首都大学東京, 理工学研究科, 准教授 (90321489)
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| Co-Investigator(Kenkyū-buntansha) |
岡田 重人 九州大学, 先導物質化学研究所, 教授 (10304841)
吉岡 聰 九州大学, 工学研究院, 助教 (50452818)
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| Co-Investigator(Renkei-kenkyūsha) |
NISHIDA Tetsuaki 近畿大学, 工学部, 教授 (10112286)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2017: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2016: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2015: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000)
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| Keywords | メスバウアー分光法 / バナジン酸塩ガラス / 二次電池正極材 / 二次電池正極材料 / 導電性 / 導電性ガラス |
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| Outline of Final Research Achievements |
In this project, we investigated a relationship between the structure and electrical properties of sodium phosphovanadate glass with the composition of xNa2O・10P2O5・(90-x)V2O5 ('x' = 5-45 mol%, abbreviated as xNPV) as a cathode active material with high performance. DTA curves of xNPV glass showed a decrease in glass transition temperature (Tg) from 235 to 195 oC, while electrical conductivity (EC) decreased from 3.6×10-6 to 6.4×10-8 S cm-1 with the increase of‘x’from 5 to 45. These results suggested that the cleavage of the 3D-network structure caused the decrease in Tg and EC . Charge-discharge capacity of as-quenched xNPV glass showed a larger initial capacity than that of heat-treated samples. In particular, 45NPV glass had a large initial capacity of 258 mAh/g while it showed a very small irreversible capacity (21 mAh/g). These results suggest that 45NPV glass is a one of the good candidates for a cathode active material of sodium ion batteries.
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