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

1.氟-石墨化合物的电子结构和晶格结构用NEXAFS和XPS电子能谱、透射电子显微镜和电化学方法研究了碳-pi电子体系与F_2相互作用时电子结构和晶格结构的变化。这种受控的相互作用使氟碳材料具有从高导电体到绝缘体的各种性质。在此基础上，提出了氟碳材料的能带模型。2.活性碳纤维(ACF)-氟化微孔-元素氟与ACF在100ﾟ℃的相互作用得到了表面氟化ACF(F-ACF)，其组成为C_&lt；1.4&gt；F-ACF中的C-F成键性质是共价的，微孔ACF具有明显的疏水性。3.中碳微球(MCMB_S)及二次锂电池碳负极材料的氟化。中碳微球(MCMB-1000)和2800ﾟC(MCMB-2800)在较低的温度(25~200ﾟC)下与元素氟反应生成C_xF(50&lt；大于或等于-gt；x&lt；大于或等于-gt；x&lt；富氟材料(x&lt；1)是共价化合物，但对于贫氟化合物(x&gt；6)，C-F键的性质是半离子的。经氟化处理后，MCMB-S的X射线衍射线未发生变化。这些X射线衍射数据表明，MCMB_S衍生的CxF中保留了体相的pi电子体系，只发生了表面氟化。显然，MCMB_S的最佳氟处理提高了MCMB_S二次锂电池电极的充电容量。

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.