Synthesis and Electrochemical Characterization of a Polyradical Cathode Material for Rechargeable Batteries

Jiro IRIYAMA  Kentaro NAKAHARA  Shigeyuki IWASA  Yukiko MORIOKA  Masahiro SUGURO  Masaharu SATOH  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.6   pp.1256-1257
Publication Date: 2002/06/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Issue on Recent Progress in Organic Molecular Electronics)
Category: Electronic Devices
Keyword: 
organic radical,  cathode,  rechargeable battery,  polymer,  

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Summary: 
We have developed the new energy storage system utilizing a radical redox reaction of poly (2,2,6,6-tetramethylpiperidinoxy methacrylate), PTMA. The coin-type cell with PTMA cathode demonstrates the charge capacity of is 72 Ah/kg, which corresponds to 65% of the theoretical capacity, and the coulombic efficiency was 90% in first charge-discharge cycle. The results indicate that the stable polyradical cathodes are promising materials due to their high charge utilization and the possibilities for the wide diversity of molecular design.