SEMINAR

报告内容摘要：

An important trend in electronics involves the development of materials, mechanical designs and manufacturing strategies that enable the use of unconventional substrates, such as polymer films, metal foils, paper sheets or rubber slabs.  The last possibility is particularly challenging because the systems must accommodate not only bending but also stretching, sometimes to high levels of strain (>100%).  Although several approaches are available for the electronics, a persistent difficulty is in energy storage devices and power supplies that have similar mechanical properties, to allow their co-integration with the electronics.  Here, we introduce a set of materials and design concepts for a rechargeable lithium ion battery technology that exploits thin, low modulus, silicone elastomers as substrates, with a segmented design of the active materials, and unusual fractal inspired interconnect structures.  The result enables reversible levels of stretchability up to 300%, while maintaining capacity densities of ~1.1 mAh/cm2.  The fractal inspired interconnects are also exploited, together with the idea of soft microfluidics and structured adhesive surfaces, to achieve ultralow modulus, highly stretchable systems that incorporate assemblies of high modulus, rigid, state-of-the-art functional elements.  The outcome is a thin, conformable device technology that can softly laminate onto the surface of the skin, to enable advanced, multifunctional operation for physiological monitoring in a wireless mode.

报告人简介：

张一慧，现为美国西北大学环境与土木工程系博士后，2011年在清华大学取得博士学位。他的主要研究兴趣是可延展电子器件和铁电材料的多尺度力学。目前已发表SCI论文42篇，发表的期刊涵盖Science、Nature Materials、Nature Communications、Advanced Functional Materials、JMPS、IJSS、PRB、ActaMaterialia、Soft Matter、Composites Science and Technology等综合类、力学类和材料类权威期刊。发表的研究成果受到BBC、NBC、CBS、Wall Street Journal、MIT Technology Review、Daily Mail、新华网、参考消息、中国日报、中国网等国内外重要媒体的焦点报道