Synthesis and structure of fluorine-graphite compounds and their application to lithium battery

1.高氟化石墨的合成、结构及化学键合在含有少量MoF_6的无水液体HF中制备了高氟化石墨。产物是C_2.0F至C_2.4F的第1阶段化合物，c轴重复距离为5.2-6。 A和面内晶格参数为2.468-2.473 A。在687.0-687.1 eV处观察到它们的F_ 1s> XPS光谱，在284.6 eV处观察到C_ 1s>光谱，其中287.7-288.0 eV的移动峰表明C-F键合。 IR吸收光谱在1120cm ^ -1 处显示出非常强的吸收。这些数据表明C-F键为半共价键。2.氟化钒石墨插层化合物的合成及结构制备了2～15级氟化氧化钒石墨插层化合物。通过IR光谱和XPS发现插层物质为VOF_3和过量的氟，其组成为VOF_4。IR光谱显示在760和1140cm^-1处的两个吸收接近于VOF_3气体的吸收。 V_ 2p XPS谱清楚地显示了V-F和V＝0键。由高取向热解石墨制备的C_xVOF_4的电导率高达1X10^5cm^-1。

1.Synthesis, structure and chemical bonding of highly fluorinated graphiteHighly fluorinated graphite has been prepared in anhydrous liquid HF containing a small amount of MoF_6. The products were stage 1 compounds of C_<2.0>F to C_<2.4>F with c-axis repeat distances of 5.2-6.? A and in-plane lattice parameter of 2.468-2.473 A.Their F_<1s> XPS spectra were observed at 687.0-687.1 eV and C_<1s> spectra at 284.6 eV with shifted peaks of 287.7-288.0 eV indicating C-F bonding. IR absorption spectrum showed a very strong absorption at 1120 cm^<-1>. These data show that C-F bonding is semi-covalent.2.Synthesis and structure of vanadium oxide fluoride-graphite intercalation compoundStage 2 to 15 graphite intercalation compounds of vanadium oxide fluoride have been prepared. The intercalated species was found to be VOF_3 and excess fluorine with composition of VOF_4 by IR spectroscopy and XPS.IR spectrum showed two absorptions at 760 and 1140 cm^<-1> close to those of VOF_3 gas. The V_<2p> XPS spectrum clearly showed the V-F and V=0 bonds. The electrical conductivity of C_xVOF_4 prepared from highly oriented pyrolytic graphite was as high as 1X10^5 cm^<-1>.