The Design, Synthesis And Modification Of Metal Phthalocyanine Complexes And Their Catalytic Performance For Lithium/thionyl Chloride Batteries

Lithium/thionyl chloride battery is widely used in military because it is a kind of a disposable battery with high energy efficiency.At the same time,there is the problem of voltage lag restricting its good performance to play.Therefore,it is urgent need to solve this problem by adding the high-effective catalyst.As a macrocyclic compounds,phthalocyanine has a large circle which could hold the metal with the similar diameter to match such as iron,cobalt,nickel and so on.Phthalocyanine ring is big 187c electronic conjugated system.Its special structure decides it superior catalytic performance.Because of its superior electronic transmission capacity,carbon nanotubes are often used in modification of battery materials.Based on their superior performance in catalytic and electrical performance,these two things were linked by amide in this work.Series of mononuclear 2,9,16,23-tetranitro-metallophthalocyanine and series binuclear hexanitro-metallo phthalocyanine-perylene were designed and synthesized by solvent method.Series of mononuclear metallophthalocyanine-amide-multi-walled carbon nanotube compounds and binuclear metallophthalocyanine-amide-multi-walled carbon nanotube compounds were designed and synthesized in this paper.Their structures were characterizated through the FTIR,UV,XRD,XPS,SEM.Their catalytic performance to lithium/thionyl chloride battery were gotten from the test of simulated battery discharge,and battery capacity increase rate were gotten from the quantitative calculation through these results.Then we could get the following conclusion:the electrochemical catalytic performance of mononuclear metallophthalocyanine-amide-multi-walled carbon nanotube compounds from high to low in turn is:Co,Ni,Mn,Fe,Cu,Zn of mononuclear metallophthalocyanine-amide-multi-walled carbon nanotube compounds,and battery capacity increase rate is 15.44%?88.49%.The electrochemical catalytic performance of binuclear metallophthalocyanine-amide-multi-walled carbon nanotube compounds from high to low in turn is:Fe,Co,Cu,Zn,Ni,Mn of binuclear metallophthalocyanine-perylene-amide-multi-walled carbon nanotube compounds,and battery capacity increase rate is 59.1%?128.5%?There are three electrodes in the cyclic voltammetry in thlonyl chloride/lithium tetrachloroaluminate solution.They are glassy carbon electrode(01)using as work electrode,two lithium pieces using as auxiliary electrode and reference electrode.The result the same as the test of simulated battery discharge are gotten from this method.The catalysis performance were compared the phthalocyanine linked with carbon nanotubes before and after.The performance of electrochemical catalyt from high to low in turn is:CuPc-CNTs(linked)>CuPc>blank>CuPc/CNTs(mix)>CNTs.This result means that the electrochemical catalytic performance of the monouclear metallophthalocyanine-amide-multi-walled carbon nanotube compound catalyst is better than monouclear amino-metallophthalocyanine.By the same method,the performance of the electrochemical catalyst from high to low in turn is:Fe2Pc2-CNTs(linked)>Fe2Pc2>blank>Fe2Pc2/CNTs(mix)>CNTs.This conclusion that carbon nanotubes only linked with metallophthalocyanine could catalyst lithium/thionyl chloride battery is the same as last experiment.The type of catalyst effects the work electrode is diffusion through the cyclic voltammetry under the scan rate in 40 mV/s,60 mV/s,80 mV/s and 100 mV/s respectively.The catalytic mechanism could get from the feature of cyclic voltammograms.First step,the catalyst and thionyl chloride become complex.Second step,two electrons add to the complex from the electrolyte and generates the S,SO2 and Cl-,the catalyst recover the original sample.This is a whole catalyst cycle.Multi-walled carbon nanotube plays a role to speed up the electron transmission in this process.