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Folding Graphene Film Yields High Areal Energy Storage in Lithium-Ion Batteries
ACS Nano ( IF 15.8 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acsnano.7b08489 Bin Wang 1 , Jaegeon Ryu 2 , Sungho Choi 2 , Gyujin Song 2 , Dongki Hong 2 , Chihyun Hwang 2 , Xiong Chen 1 , Bo Wang 1 , Wei Li 1 , Hyun-Kon Song 2 , Soojin Park 2 , Rodney S. Ruoff 1, 3, 4
ACS Nano ( IF 15.8 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acsnano.7b08489 Bin Wang 1 , Jaegeon Ryu 2 , Sungho Choi 2 , Gyujin Song 2 , Dongki Hong 2 , Chihyun Hwang 2 , Xiong Chen 1 , Bo Wang 1 , Wei Li 1 , Hyun-Kon Song 2 , Soojin Park 2 , Rodney S. Ruoff 1, 3, 4
Affiliation
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We show that a high energy density can be achieved in a practical manner with freestanding electrodes without using conductive carbon, binders, and current collectors. We made and used a folded graphene composite electrode designed for a high areal capacity anode. The traditional thick graphene composite electrode, such as made by filtering graphene oxide to create a thin film and reducing it such as through chemical or thermal methods, has sluggish reaction kinetics. Instead, we have made and tested a thin composite film electrode that was folded several times using a water-assisted method; it provides a continuous electron transport path in the fold regions and introduces more channels between the folded layers, which significantly enhances the electron/ion transport kinetics. A fold electrode consisting of SnO2/graphene with high areal loading of 5 mg cm–2 has a high areal capacity of 4.15 mAh cm–2, well above commercial graphite anodes (2.50–3.50 mAh cm–2), while the thickness is maintained as low as ∼20 μm. The fold electrode shows stable cycling over 500 cycles at 1.70 mA cm–2 and improved rate capability compared to thick electrodes with the same mass loading but without folds. A full cell of fold electrode coupled with LiCoO2 cathode was assembled and delivered an areal capacity of 2.84 mAh cm–2 after 300 cycles. This folding strategy can be extended to other electrode materials and rechargeable batteries.
中文翻译：
折叠式石墨烯薄膜可在锂离子电池中实现较高的区域能量存储
我们表明，在不使用导电碳，粘合剂和集电器的情况下，采用独立式电极可以以实用的方式实现高能量密度。我们制造并使用了专为高面积容量阳极设计的折叠式石墨烯复合电极。传统的厚石墨烯复合电极，例如通过过滤氧化石墨烯以形成薄膜并通过化学或热方法将其还原而制成的，其反应动力学缓慢。取而代之的是，我们制作并测试了一种复合薄膜电极，该电极使用水辅助方法折叠了好几次。它在折叠区域提供了连续的电子传输路径，并在折叠层之间引入了更多通道，从而显着增强了电子/离子传输动力学。由SnO 2组成的折叠电极/石墨烯具有5 mg cm -2的高面负载，具有4.15 mAh cm -2的高面容量，远高于商用石墨阳极（2.50-3.50 mAh cm -2），而厚度则可低至约20μm 。与具有相同质量负载但没有折叠的厚电极相比，折叠电极在1.70 mA cm –2的条件下在500个循环中显示出稳定的循环，并提高了倍率能力。组装了完整的折叠电极和LiCoO 2阴极，经过300次循环后，其单位面积容量为2.84 mAh cm –2。这种折叠策略可以扩展到其他电极材料和可充电电池。
更新日期：2018-01-19
中文翻译：
折叠式石墨烯薄膜可在锂离子电池中实现较高的区域能量存储
我们表明，在不使用导电碳，粘合剂和集电器的情况下，采用独立式电极可以以实用的方式实现高能量密度。我们制造并使用了专为高面积容量阳极设计的折叠式石墨烯复合电极。传统的厚石墨烯复合电极，例如通过过滤氧化石墨烯以形成薄膜并通过化学或热方法将其还原而制成的，其反应动力学缓慢。取而代之的是，我们制作并测试了一种复合薄膜电极，该电极使用水辅助方法折叠了好几次。它在折叠区域提供了连续的电子传输路径，并在折叠层之间引入了更多通道，从而显着增强了电子/离子传输动力学。由SnO 2组成的折叠电极/石墨烯具有5 mg cm -2的高面负载，具有4.15 mAh cm -2的高面容量，远高于商用石墨阳极（2.50-3.50 mAh cm -2），而厚度则可低至约20μm 。与具有相同质量负载但没有折叠的厚电极相比，折叠电极在1.70 mA cm –2的条件下在500个循环中显示出稳定的循环，并提高了倍率能力。组装了完整的折叠电极和LiCoO 2阴极，经过300次循环后，其单位面积容量为2.84 mAh cm –2。这种折叠策略可以扩展到其他电极材料和可充电电池。
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