The Design And Synthesis Of Binuclear Metal Phthalocyanine Compounds And Their Research On The Catalytic Performance Of Li/SOCl₂ Batteries

Lithium/thionyl chloride(Li/SOCl2)battery is a kind of non-aqueous system battery,it has high and stable operation voltage,high energy density,wide operating temperature ranges and stored for a long time.However,the performance of Li/SOCl2 battery remains to be improved.In this paper,four series of binuclear metal azaphthalocyanine compounds M2(azaPc)2Me,M2(azaPc)2S,M2(azaPc)2,M2(azaPc)2C and two series of binuclear metal phthalocyanine compounds M2Pc2Me,M2Pc2S(M= Co2+,Cu2+,Fe2+,Mn2+,Ni2+,Zn2+)were synthesized by using 5-(2,5-dioxotetrahydrofuryl)-3-methyl-3-cyclohexene-1,2-dicarboxylic anhydride,3,3’,4,4’-diphenylsulfonetetracarboxylic dianhydride,3,3’,4,4’-biphenyl tetracarboxylic diandhy dr ide,3,3’,4,4’-benzophenonetetracarboxylic dianhydride,2,3-pyridinedicarboxylic acid and phthalic anhydride as precursors.All the phthalocyanine compounds were characterized by element analysis,infrared spectra,thermogravimetric analysis and UV-Vis absorption.Electrical properties of these binuclear metal phthalocyanine compounds have been characterized as Li/SOCl2 battery catalysts.From the experimental results we can conclude that:(1)Binueler metal phthalocyanine compounds have good catalytic activity:Mn2Pc2S can increase the discharge voltage to 3.3485 V,raised by 0.1570 V compare to the blank battery;Co2(azaPc)2C can rise the discharge time to 1821 s,increase rate is 75.80 percent;Co2(azaPc)2 can rise battery capacity to 35.24 mA h,increase rate is 79.56 percent;(2)The catalytic perfoemance of M2(azaPc)2Me are compared with M2Pc2Me,and M2(azaPc)2S are compared with M2Pc2S,binuclear phthalocyanine compounds have better catalytic activity as Li/SOCl2 battery catalysts than binuclear azaphthalocyanine compounds;(3)As Li/SOCl2 battery catalyst,the catalytic properties of different series of phthalocyanine compounds has no fixed order,the structure of phthalocyanine and center metal both have effect on catalytic activity;(4)We can infer from the electrochemical cyclic voltammograms that SOCl2 have two step reduction reactions in the catalytic process,and the reaction process is irreversible.The catalytic mechanism is analysed.