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Preparation of Electric Double Layer Capacitor depended on the effect of edge sites of grapheme structure

利用石墨烯结构边缘位点效应制备双电层电容器

基本信息

批准号：
17560601
负责人：
OTA Michiya
金额：
$ 1.79万
依托单位：
Gunma National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

The following results were obtained for the past two years from April of 2005 to March of 2007.The aim of this first year from April of 2005 to March of 2006 was to prepare exfoliated mesocarbon microbeads(Ex-MCMB) to make a rectangular thin electrode.(1) Accordion-like exfoliated MCMB was obtained by rapid pyrolysis at 1000℃ of the intercalated MCMB with the mixed acid of sulfuric and nitric acids at the volume ratio of 4/1.(2) Expansion and disorder between aromatic carbon layers were observed from the results of X-ray powder diffraction profiles. The exposure of edge sites proceeded through exfoliation process of carbon layers.(3) Specific surface area and pore size distribution of the MCMB before and after exfoliation by Mercury Porosimeter showed the appearance of mesopore.The aim of the second year from April of 2006 to March of 2007 was to evaluate the performance as electric double layer capacitor by decrease of internal resistance between carbon current collector and carbon rectangular polarized electrode.(1) Exfoilation of MCMB successfully produced by use of MCMB graphitized at 2000 or 3000℃.(2) Specific surface area of MCMB graphitized at 2000℃ was largely increased from 0.8 m^2/g to 70 m^2/g by exfoliation. The adsorption isotherms of the exfoliated samples showed the behavior of type I dominated by micropore.(3) Electrostatic capacity of the electrode made from the Ex-MCMB based polarized electrode and carbon current collector showed five times as larger as the electrode made from PTFE, carbon black, and Ex-MCMB. In addition, contact resistance also decreased.(4) SEM images of the Ex-MCMB based polarized electrode showed that carbon coatings covered on the edge surface of exfoliated lamellar. The carbon coatings seemed to decrease the electrostatic capacity. Electrochemical oxidation, however, improved the electrostatic capacity up to 50 F/g.

从2005年4月到2007年3月的过去两年中获得了以下结果。从2005年4月到2006年3月的第一年的目标是制备剥离的中间相碳微球（Ex-MCMB）以制备矩形薄电极。(1)插层MCMB在体积比为4/1的硫酸和硝酸混合酸中于1000℃快速热解，得到手风琴状剥离MCMB。(2)X射线粉末衍射分析结果表明，碳层间存在膨胀和无序现象。边缘部位的暴露是通过碳层的剥落过程进行的。(3)用压汞法测得剥离前后MCMB的比表面积和孔径分布均显示出中孔的出现。第二年从2006年4月到2007年3月的目的是通过降低碳集流体和碳矩形极化电极之间的内阻来评价作为双电层电容器的性能。(1)用2000 ℃和3000℃石墨化的MCMB成功地生产了MCMB。(2)在2000℃石墨化的MCMB的比表面积由0.8 m^2/g大幅度提高到70 m^2/g。剥离样品的吸附等温线显示出以α-Al_2O_3为主的I型吸附行为。(3)由基于Ex-MCMB的极化电极和碳集流体制成的电极的静电容量显示为由PTFE、炭黑和Ex-MCMB制成的电极的五倍大。此外，接触电阻也降低。(4)SEM照片显示，电极表面有碳涂层覆盖在剥离片层边缘。碳涂层似乎降低了静电容量。然而，电化学氧化将静电容量提高到50 F/g。