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PREPARATION OF CARBON CLUSTERS WITH CONTROLLED ELECTRONIC PROPERTIES AND THEIR POTENTIAL USE

具有可控电子性质的碳团簇的制备及其潜在用途

基本信息

批准号：
11555229
负责人：
TOUHARA Hidekazu
金额：
$ 7.17万
依托单位：
SHINSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555229/
关键词：
fluorinated fullerenes fullerene film fluoride ion doping multiwall carbon nanotube single wall carbon nanotubes lithium battery electrochemical lithium insertion B-doping C_<70>薄膜フッ化物イオンドーピングリチウム電池 C_<60>薄膜リチウムイオンドーピング

项目摘要

The present research has dealt with preparation of carbon clusters with controlled electronic properties and their potential use. The carbon clusters in the present study include fullerenes and carbon nanotubes. The results were summarized as follows.1. The energies of E_F and E_a of C_<60> become larger as the degree of fluorination increases. This results suggest that the control of electronic structure of C_< 60> are possible by the control the fluorine addit on. Highly fluorinated C_<60>F_X ( x >40 ) has a wide band gap larger than 3 eV, whereas, fluorinated fullerenes C_<60>F_X of lower fluorine content ( x <18 ) will have a narrower band gap suitable for potential electronics.2. Electrochemical fluoride-ion doping of fullerene C_<60> thin films ( 250-450 nm ) was carried out in a fluoride-ion conductive solution, MeCN solution of 1M Et_4NF・4HF. Galvanostatic oxidation yielded C_<60>F_<ca.1-3> where fluorine exists as semi-ionic species in the cavity surrounded by C_<60> molecules … More without forming covalent C-F bonds. Fluoride-ion doped C_<70> thin films C_<70>F_<ca.1-6> were also obtained by galvanostatic oxidation.3. Electrochemical lithium insertion into multiwall carbon nanotubes ( MWNTs ) heat treated at 1000-3000℃, and into chemically modified MWNTs by B-doping and by fluorination has been investigated based on Li/1M-LiClO_4-( EC+DEC )/ MWNTs cells with a three-electrode configuration. Electrochemical lithium insertion behavior has also been investigated for single-walled carbon nanotubes ( SWNTs ) prepared by the arc-discharge method. The optimum effects of heat-treatment on the electrochemical lithium insertion into MWNTs were observed at 1000℃. The reversible capacity of MWNTs fairly increased by B-doping and by fluorination. As for SWNTs, the reversible lithium insertion capacity and the coulomb efficiency were found to be 430 mAh/g and 18 % , respectively at the first cycle, even in the absence of any characteristic X-ray diffraction line of the rope structure. Less

本论文主要研究了电子性质可控的碳团簇的制备及其应用前景。本研究中的碳团簇包括富勒烯和碳纳米管。研究结果如下：1. C_的E_F和E_a的能量<60>随碳原子数的增加而增大。结果表明，< 60>通过控制氟的添加量可以控制C_ F_X的电子结构，高氟含量的C_<60>F_X（x >40）具有大于3 eV的宽带隙，而低<60>氟含量的C_ F_X（x <18）具有适合于势电子的较窄的带隙.在<60>1 M Et_4NF·4 HF的MeCN溶液中，对富勒烯C_2薄膜（250-450 nm）进行了电化学氟离子掺杂。恒电流氧化得到C_<60>F_<ca.1-3>，其中氟以半离子形式存在于C_分子包围的空腔中<60> ...更多信息而不形成共价C-F键。采用恒电流氧化法制备了氟离子掺杂的<70>C_<70>F_薄膜<ca.1-6>.基于三电极结构的Li/1 M-LiClO_4-（EC+DEC）/ MWNTs电池，研究了在1000-3000℃热处理的MWNTs、硼掺杂改性的MWNTs和化学改性的MWNTs中的电化学嵌锂。研究了电弧放电法制备的单壁碳纳米管的电化学嵌锂行为。在1000℃下热处理对MWNTs电化学嵌锂的影响最佳。硼掺杂和硼掺杂均能显著提高碳纳米管的可逆容量。至于单壁碳纳米管，可逆的锂插入容量和库仑效率被发现是430毫安时/克和18%，分别在第一次循环，即使在没有任何特征的X射线衍射线的绳状结构。少