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maintech木虫 (正式写手)
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最新ACS文章Lithium Ion Battery 已有3人参与
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Graphene Nanotube Iron Hierarchical Nanostructure as Lithium Ion Battery Anode 实验方法不是很复杂，但思路非常的不错，通过微波激发诱导的方法将分散在乙腈中的膨胀氧化石墨片转化成三维层阶结构(乙腈中加入了二茂(络)铁和偶氮甲酰胺)，最终使得石墨片中长出树枝状的碳管。而铁原子或铁纳米粒子分布在石墨烯片上或者碳管的端口。充放电过程中由锂与氧化铁之间的可逆反应决定(作者认为)，锂原子主要在石墨烯面上和碳管外表面吸附或解吸。虽然充放电平台中的电压比较低，但材料的单位容量却很惊人。重要的是从其中借鉴一种思路。 Si-Hwa Lee,† Vadahanambi Sridhar,† Jung-Hwan Jung,†,‡ Kaliyappan Karthikeyan,§ Yun-Sung Lee,§Rahul Mukherjee,^ Nikhil Koratkar,^ and Il-Kwon Oh†,* In this study, we report a novel route via microwave irradiation to synthesize a bio-inspired hierarchical graphene nanotubeiron three-dimensional nanostructure as an anode material in lithium-ion batteries. The nanostructure comprises vertically aligned carbon nanotubes grown directly on graphene sheets along with shorter branches of carbon nanotubes stemming out from both the graphene sheets and the vertically aligned carbon nanotubes. This bio-inspired hierarchical structure provides a threedimensional conductive network for efficient charge-transfer and prevents the agglomeration and restacking of the graphene sheets enabling Li-ions to have greater access to the electrode material. In addition, functional iron-oxide nanoparticles decorated within the three-dimensional hierarchical structure provides outstanding lithium storage characteristics, resulting in very high specific capacities. The anode material delivers a reversible capacity of ～1024 mA 3 h 3 g1 even after prolonged cycling along with a Coulombic efficiency in excess of 99%, which reflects the ability of the hierarchical network to prevent agglomeration of the iron-oxide nanoparticles.  图片2.png  图片1.png [ Last edited by maintech on 2013-4-11 at 21:54 ] |
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2013-04-09 20:42:02, 1.59 M
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