Flexible battery power


15 March 2007

Japanese scientists have made a paper-like, polymer-based rechargeable battery.
The battery, designed by Hiroyuki Nishide, Hiroaki Konishi and Takeo Suga at Waseda University, has an electrode made from a redox-active organic polymer film about 200 nanometres thick. The polymer has nitroxide radical groups which act as charge carriers.

The battery has a high charge/discharge capacity because of its high radical density (two radicals for each repeat unit). According to Nishide, this is just one of many advantages the 'organic radical' battery has over other organic-based materials which are limited by the amount of doping.
'The power rate performance is strikingly high - it only takes one minute to fully charge the battery,' said Nishide, 'and it has a long cycle life, often exceeding 1000 cycles.'

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