1998 Fiscal Year Final Research Report Summary
Development of Thermostable Polymer Battery with Large Capacity
| Project/Area Number |
09555297
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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 | 展開研究 |
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| Research Field |
高分子構造・物性(含繊維)
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| Research Institution | Keio University |
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Principal Investigator |
YAMAMOTO Kimihisa Keio University, Faculty of Sci.& Eng., Assoc.Professor, 理工学部, 助教授 (80220458)
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| Co-Investigator(Kenkyū-buntansha) |
TSUCHIDA Eiji Waseda University, Faculty of Sci.& Eng., Professor, 理工学部, 教授 (90063461)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Conductive polymer / Themo-stability / High conductivity / Polymer battery / Capacitor |
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| Research Abstract |
In order to improve the thermal stability of the electronic conductivity of polypyrrole(PPy), a series of aromatic sulfonate derivatives having acid-type substitute groups, such as -COGH, -OH, and SO_3H, were used as a dopants. The PPy doped with these dopants showed excellent thermal stability of their electric conductivity, even at 150ﾟC in air. Especially, 2-hydroxy-5-sulfobezoic acid provided the highest thermal stability. The doped PPy maintained 95 % of its initial conductivity even after heating for 8 h at 150*in air and showed 20-times higher stability against long-term heating at 125*for 1000 h in comparison with PPy doped p-methylbenzoic acid.
The thermal stabilization mechanism has suggested hat dopants having acidic substituents should suppress proton dissociation from the N-position of the PPy and keep the p-conjugation structure by supplying a proton from acidic groups. Such a proton supplement was confirmed by the IR spectroscopy of deuterized PPy.
Their PPys were applicable to use an electrode material of battery and capacitor. The capacitor using PPy doped the antioxidative dopant provides high reliability under high temperature in air for long-term with good high frequency properties.
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