PROPERTIES AND MANIFESTATION OF FUNCTIONALITY OF CARBON-pi ELECTRON SYSTEM.

碳π电子系统的特性和功能表现。

• 批准号: 07650986
• 负责人: TOUHARA Hidekazu
• 金额: $ 1.6万
• 依托单位: SHINSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650986/
• 关键词: Activated Carbon Fiber; Mesocarbon Microbeads; Fluorination; Electronic Structure; Carbon Negative Electrode; Secondary Lithium Battery; Perturbation of pi-electron Systems; フッ素; リチウム二次電池; 表面フッ素処理

1.Electronic and Lattice Structure of Fluorine-Graphite CompoundsThe changes in electronic and lattice structures of carbon-pi electron systems upon interactions with F_2 have been investigated by electron spectroscopies of NEXAFS and XPS,TEM and electrochemical methods. The controlled interactions give fluorine-carbon materials with diverse properties ranging from high electrical conductors to insulators. Based on these results, schematic band models of fluorine-carbon materials have been proposed.2.Fluorination of Activated Carbon Fibers (ACF)-Fluorinated Micropores-Interaction of elemental fluorine with ACF at 100ﾟC has given surface fluorinated ACF (F-ACF) with the composition C_<1.4>F.The C-F bonding nature in F-ACF is covalent, and the marked hydrophobic nature is given to the microporous ACF.The pore width does not greatly change due to the fluorination, however, the micropore volume is significantly decreased from 0.65 ml/g (ACF) to 0.19 ml/g (F-ACF).3.Fluorination of Mesocarbon Microbeads (MCMB_s) and Carbon Negative Electrode Materials for Secondary Lithium Batteries.Mesocarbon microbeads heat treated at 1000 (MCMB-1000) and 2800ﾟC (MCMB-2800) react with elemental fluorine at rather lower temperatures ranging from 25 to 200ﾟC to produce C_xF (50<greater than or equal>x<greater than orFluorine rich materials (x<1) are covalent compounds but C-F bonds are semi-ionic in character for fluorine poor compounds (x>6). The X-ray diffraction lines of MCMB_s were unchanged by fluorination. These XRD data indicate that the bulk pi-electron systems are preserved in MCMB_s derived C_xF and that only the surface fluorination does occur.It has become apparent that optimal fluorine treatments of MCMB_s increase the rechargeable capacities of MCMB electrodes for secondary lithium batteries.

1.氟-石墨化合物的电子和晶格结构用NEXAFS、XPS、TEM和电化学方法研究了碳- π电子体系与F_2相互作用后的电子和晶格结构变化。受控制的相互作用使氟碳材料具有从高电导体到绝缘体的各种特性。在此基础上，提出了氟碳材料的示意图带模型。活性炭纤维（ACF）的氟化-氟化微孔-元素氟与ACF在100℃下的相互作用得到了表面氟化ACF (F-ACF)，其组成为C_<1.4>F。F-ACF的C-F键性质为共价键，微孔ACF具有明显的疏水性。微孔体积由0.65 ml/g （ACF）显著减小至0.19 ml/g （F-ACF）。二次锂电池用中碳微珠氟化及碳负极材料研究在1000 （MCMB-1000）和2800 （MCMB-2800）的温度下热处理的中碳微珠（MCMB-2800）与单质氟在相对较低的温度范围内（从25到200）的温度范围内反应，产生C_xF(50<大于等于>x<大于或或富氟材料（x<1）是共价化合物，但C- f键是半离子性质的氟贫化合物（x>6）。氟化后MCMB_s的x射线衍射线没有变化。这些XRD数据表明，MCMB_s衍生的C_xF中保留了大量的pi电子体系，只发生了表面氟化。结果表明，优化的氟处理可以提高二次锂电池用MCMB电极的可充电容量。

项目成果

服部義之、東原秀和: "フッ素化活性炭素繊維-反応、構造、物性と機能-" 表面. 35. 54-61 (1996)

Yoshiyuki Hattori、Hidekazu Higashihara：“氟化活性碳纤维 - 反应、结构、物理性能和功能 -”Surface。35. 54-61 (1996)

一色鉄也ら: "フッ素-グラファイト層間化合物の透過型電子顕微鏡を用いた構造解析" 炭素. 175. 279-285 (1996)

Tetsuya Isshiki 等人：“使用透射电子显微镜对氟石墨插层化合物进行结构分析”Carbon，175. 279-285 (1996)。