An important trend in electronics involves the development of materials, mechanical designsand manufacturing strategies that enable the use of unconventional substrates, such aspolymer films, metal foils, paper sheets or rubber slabs. The last possibility is particularlychallenging because the systems must accommodate not only bending but also stretching.Although several approaches are available for the electronics, a persistent difficulty is inpower supplies that have similar mechanical properties, to allow their co-integration with theelectronics. Here we introduce a set of materials and design concepts for a rechargeablelithium ion battery technology that exploits thin, low modulus silicone elastomers as substrates,with a segmented design in the active materials, and unusual ‘self-similar’ interconnectstructures between them. The result enables reversible levels of stretchability up to300%, while maintaining capacity densities of B1.1 mAhcm2. Stretchable wireless powertransmission systems provide the means to charge these types of batteries, without directphysical contact.
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