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

1.高氟化石墨的合成、结构及化学键在含少量MoF_6的无水氢氟化氢中合成了高氟化石墨。产物为C_&lt；2.0&gt；F到C_&lt；2.4&gt；F的一级化合物，c轴重复距离为5.2-6。在687.0-687.1 eV处观察到它们的F&lt；1s&gt；XPS谱，在284.6 eV处观察到C&lt；1s&gt；峰位移为287.7-288.0 eV，表明它们是C-F键。红外吸收光谱在1120 cm~(-1)&gt；处有很强的吸收。2.氟化钒-石墨层间化合物的合成与结构已制备了2-15级氟化钒石墨层间化合物。红外光谱和X射线光电子能谱分析表明插层物种为VOF_3和过量氟，组成为VOF_4。红外光谱在760和1140 cm~(-1)处有两个与VOF_3气体相近的吸收峰。V&lt；2p&gt；XPS谱清楚地显示了V-F键和V=0键。由高取向热解石墨制备的C_xVOF_4的电导率高达1×10~(-5)cm~(-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>.