Ferric Chloride - Preparation Of Compounds Of Aluminum Chloride - Graphite Layer And Its Electrical Conductivity And Stability

With the advantages of good structural stability and conductive stability as well as high conductivity, metal chloride-GIC is expected to be one kind of conductive materials to take the place of some metals such as copper and aluminum. Though studies on its preparation~ structure~ properties and applications are more active, there are no domestic reports concerning high conductive metal chloride-GIC preparing with PAN-based carbon fiber as the host, which is more convenient for application.Due to the complicated structure of PAN-based CF. FeCI3 is difficult to intercalate into the layers of graphite micro crystals in CF. Meanwhile, the structure analysis methods such as XRD can not show the structure changes of intercalated CF. In order to solve the above problems, AlCl3 was introduced as a promoter for FeC 13 intercalation. In the experiments, FeCI3 together with AICI3 is used as the guest and the carbon fiber and NFG were used as the different hosts, the above two ternary GIC are synthesized simultaneously by the mixed molten method. The intercalation process of FeCl3 and AICI3 into PAN-based CF was illustrated indirectly by using nature flake graphite (NFG) as host in the same reaction system whose stage structure is easier to be analyzed.The effects of the reaction temperature, the ratio of carbon and metal chloride, and reaction time on the elect?cal conductivity of the intercalated carbon fiber were studied. According to the results of modern structure analysis such as XRD, SEM, XPS, etc., the intercalation process and mechanism of FeCl3 and AIC13 in NFG and CF were preliminary studied.The reason for the conductivity variation of the intercalated CF was discussed. The structure stability and the electrical conductivity stability of the resultants under different circumstances and conditions were investigated.The results show that the reaction temperature, the reaction time, the molar ratio of carbon and metal chloride, and the total mass of the reactants with the samemolar ratio of carbon and meta1 chloride are all the important factors influencing thestructure and electrical conductivity of the resultants FeCl3-AlCl3-GIC. TheFeCl3-AlCl3-GIC with different ratio of stage 1 FeCI3-GIC and stage l AlCl3-GICprepared under different reaction conditions. In the intercalation process AlCI3 is notonly an intercalant, but also a promoter fOr FeCl3 intercalation. The intercalationmechanism may be that FeCl3 replaces AlCl3 gradually by fOrming intermediateproduct AlFeCl6. The conductivity of intercalated CF was obviously higher than thatof the original CF. Under suitab1e conditions the conductivity of intercalated CF isone time higher than that of original CF. The relative amounts of stage l FeCl3-GICand stage l AlCl3-GIC in the resultants is the main factor relative to the conductivity.The structural stability and conductive stability of FeCl3-AlCl3-GIC are excel1ent inthe air under room temperature, but they are not so good in some liquid media suchas HCl. NaOH etc.