Design And Synthesis Of Subphthalocyanine Compounds And Their Catalytic Performance For Lithium / Thionyl Chloride Batteries

Lithium-thionyl chloride (Li/SOCl2) battery is one of the present chemical batteries with the high battery voltage, high energy density, wide range of operational temperature, low self-discharge and long storage life. However, the problem of discharge voltage and discharge time for Li/SOCl2battery in practice is much lower than that in theory, which makes the improvement of the practical energy of Li/SOCl2battery increasingly urgent. Subphthalocyanine (BsubPc) is a macrocycle composed by three diiminoisoindole rings N-fused around a boron core and an axial ligand coordionated to the central boron atom. Subphthalocyanine has unique stereo structure and active axial group for chemical modification and catalytic application, although it is considered the homologous compound of phthalocyanine. Base on the special structure and excellent electrical conductivity, carbon nano tube (CNT) has been utilized widely and maturely.Under the anhydrous atmosphere,4subphthalocyanines with different peripheral groups were prepared by the sold and synthesized precursors. On the basis, a kind of phenol compounds, having different p-groups, were used to modification the mentioned subphthalocyanines respectively. All these compounds were characterized by UV-vis, FT-IR and elemental analysis. Furthermore, four subphthalocyanines with amino-group in axial position were linked with multi-wall carbon nano tube (MWCNT), and characterized by FT-IR, SEM, and XRD.During the Li/SOCl2cell simulation environment, all these compounds were tested for discharge property, and some were tested by cyclic voltammetry measurements. The test results show that:(1). As the catalysts, all subphthalocyanines linked MWCNT and a majority of subphthalocyanine compounds can prolong the discharge time. Compared with the reference cell, compounds MWCNT-NHPhO-BsubPc(NO2)3,(NH2)PhO-BsubPc(NO2)3, HOPhO-BsubPc and (NH2)PhO-BsubPc(α-ONa)3in the cell can prolong the discharge time57.41%,38.90%,35.91%and28.68%.(2). The reaction of Li/SOCl2battery occurs a two-step electron transfer but is irreversible. (3). The catalytic activity was influenced by both the chemical property and the volume of substituent groups.