Lee, Seung Woo

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Designing Multi-Functional Electrodes for Next-Generation Energy Storage Devices

2017-11-14 , Lee, Seung Woo

Although lithium-ion batteries and supercapacitors have shown rapid progress over the last two decades, next-generation energy storage applications, such as fast-evolving portable electronics, electrified propulsion, and loadleveling for renewable energy systems, require multi-functional energy sources that have both high-energy and -power, long cycle life, and flexibility, exceeding the performance of conventional energy storage devices. Aiming towards such advanced energy storage technologies, Dr. Lee’s research pays particular attention to harnessing charge storage reactions of nanostructured electrodes and their nano-fabrication processes. In this presentation, we will discuss our recent progress on designing multi-functional electrode materials. We will first show that redox-active organic electrodes prepared from earthabundant organic materials can be promising cathodes for large-scale energy storage devices. We reveal that these organic electrodes have promising charge storage properties for both Li- and Na-ion storage. The assembled organic electrodes are employed as cathodes for hybrid capacitors and Li- and Na-ion batteries, delivering high capacity with superior power capability and cycling stability. Thus, these high-performance organic electrodes can be promising cathodes for large-scale rechargeable batteries or hybrid capacitors. Next, we will introduce a new self-assembly technique, called a ligand-mediated layer-bylayer assembly, which can convert the insulating paper or fabric to highly porous metallic current collectors. Using this technique, we demonstrate the multifunctional energy storage devices for flexible and wearable energy storage devices.