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Gupta, Kishor,Liu, Tianyuan,Kavian, Reza,Chae, Han Gi,Ryu, Gyeong Hee,Lee, Zonghoon,Lee, Seung Woo,Kumar, Satish Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.47
<P>High surface area carbon with a surface area of 3550 m<SUP>2</SUP>g<SUP>−1</SUP>is synthesized<I>via</I>a low-cost, scalable process from polyacrylonitrile. The composite electrodes consisting of high surface area carbon and carbon nanotubes delivered a high capacitance of ∼174 F g<SUP>−1</SUP>in symmetric configurations, and a high capacity of ∼150 mA h g<SUP>−1</SUP>in asymmetric configurations against lithium metal with excellent rate-performance at practical mass loading and bulk densities.</P>
Lee, Byeongyong,Liu, Tianyuan,Kim, Sun Kyung,Chang, Hankwon,Eom, Kwangsup,Xie, Lixin,Chen, Shuo,Jang, Hee Dong,Lee, Seung Woo Elsevier 2017 Carbon Vol.119 No.-
<P>Silicon (Si) is an emerging anode material for rechargeable lithium-ion battery owing to its high theoretical capacity. However, Si-based anodes suffer from poor cycling stability because of its large volume change during lithiation/delithiation processes. Although nanostructured Si electrodes have significantly improved the cycling stability, the scale-up of these electrodes is another critical huddle for commercialization. To address these issues, we introduce a simple and scalable electrode fabrication process using low-cost submicron Si particles (<similar to 1 mu m) that was recycled from industrial Si waste. During the electrode fabrication, the submicron Si particles are encapsulated with 3D carbon matrix including a carbon coating on the Si particles and interconnected reduced graphene layers, which can effectively mitigate volume variation of the Si as well as support electrical conductivity. The submicron Si particle based electrodes exhibit a reversible capacity of 1192 mAh g(-1) at 100th cycle, retaining up to 84% of initial capacity. The introduced approach based on Si waste provides a new opportunity in fabricating sustainable and scalable Si-based anodes for high-capacity lithium-ion batteries. (C) 2017 Elsevier Ltd. All rights reserved.</P>
Lee, Byeongyong,Lee, Chongmin,Liu, Tianyuan,Eom, Kwangsup,Chen, Zhongming,Noda, Suguru,Fuller, Thomas F.,Jang, Hee Dong,Lee, Seung Woo Royal Society of Chemistry 2016 Nanoscale Vol.8 No.24
<P>Crumpled graphene is known to have a strong aggregation-resistive property due to its unique 3D morphology, providing a promising solution to prevent the restacking issue of graphene based electrode materials. Here, we demonstrate the utilization of redox-active oxygen functional groups on the partially reduced crumpled graphene oxide (r-CGO) for electrochemical energy storage applications. To effectively utilize the surface redox reactions of the functional groups, hierarchical networks of electrodes including r-CGO and functionalized few-walled carbon nanotubes (f-FWNTs) are assembled via a vacuum-filtration process, resulting in a 3D porous structure. These composite electrodes are employed as positive electrodes in Li-cells, delivering high gravimetric capacities of up to similar to 170 mA h g(-1) with significantly enhanced rate-capability compared to the electrodes consisting of conventional 2D reduced graphene oxide and f-FWNTs. These results highlight the importance of microstructure design coupled with oxygen chemistry control, to maximize the surface redox reactions on functionalized graphene based electrodes.</P>