Application of pyrrole/N-methylpyrrole composite polymer to cathode active material of lithium secondary battery.
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概要
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An electrochemically prepared polypyrrole(PPy)/poly(<I>N</I>-methylpyrrole)(PMPy) composite polymer film(PPy-PMPy) was used as a cathode active material of a rechargeable lithium battery. The charging-discharging behavior of a Li/LiClO<SUB>4</SUB>/(PPy-PMPy) battery was studied and compared with those of Li/LiClO<SUB>4</SUB>/PPy and Li/LiClO<SUB>4</SUB>/PMPy batteries. In order to rationalize the charging-discharging properties of these batteries, anion doping-undoping processes at PPy, PMPy, and PPy-PMPy electrodes were checked using the usual electrochemical techniques, such as cyclic voltammetry and potential step chronoamperometry. A PPy-PMPy film electrode gave an intermediate conductivity as well as an intermediate redox potential just between those of the PPy and PMPy electrodes. Li/LiClO<SUB>4</SUB>/(PPy-PMPy) batteries with thin (0.3 C cm<SUP>−2</SUP>-charged) and thick (10 C cm<SUP>−2</SUP>-charged) PPy-PMPy films were found to show different charging-discharging characteristics, depending on their film thickness. The IR spectra obtained for a PPy-PMPy film showed that the composition of PPy and PMPy in the resulting PPy-PMPy film was different according to its film thickness and that the PPy content in the PPy-PMPy film became higher with an increase in its film thickness.
- 公益社団法人 日本化学会の論文
著者
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Osaka Tetsuya
Department Of Applied Chemistry Faculty Of Science And Engineering Waseda University
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Naoi Katsuhiko
Department Of Applied Chemistry Tokyo University Of Agriculture & Technology
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Hirabayashi Takayuki
Department of Applied Chemistry, School of Science and Engineering, Waseda University
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Tsubota Ichiro
Department of Applied Chemistry, School of Science and Engineering, Waseda University
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