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Thanks to an energy-dense flexible lithium-ion battery, researchers have built a thin, bendable light source using an organic light-emitting diode (LED). The device could one day be incorporated into rollable or implantable electronics.
Lithium-ion batteries are among the best candidates for flexible power sources, but their electrodes could previously be made with only a few, low-performing materials. Now, Keon Jae Lee at the Korea Advanced Institute of Science and Technology in Daejeon and his colleagues have created a bendable battery by using existing methods to apply lithium-based electrodes onto a brittle mica surface at high temperature and then peel off the mica substrate. They then used a technique that they had devised to transfer the battery onto a flexible polymer. The method allows the incorporation into a flexible battery of almost all the high-performance materials that are used in rigid batteries.
Nano Lett. 12, 4810–4816 (2012) http://dx.doi.org/10.1021/nl302254v
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Bendable battery yields flexible LED. Nature 490, 9 (2012). https://doi.org/10.1038/490009e