聚邻二苄基二硫化物的合成及其性能研究

Synthesis and Properties of Poly(1,4-Dihydro-2,3-Benzo Dithiin)

以邻二氯苄为原料,合成了新型贮能物质邻二苄基二硫化物(DBD)及其聚合物(PDBD),利用元素分析、氢谱、质谱和红外光谱来表征其组成和结构。经循环伏安法研究表明,DBD的氧化还原峰峰电位分别为-0.65V和-1.9V,相距1.3V;而PDBD的分别为0.24V和-0.14V,相距0.38V,接近DBD的1/3,表明聚苯主链对硫硫键的断键和键合过程具有电催化作用;同时,经热重分析表明聚合物的硫硫键在140℃以下是稳定的,能满足其在锂电池中的应用要求。因此,PDBD在锂电池正极材料方面具有一定的应用价值。

1,4-dihydro-2,3-benzodithiin（DBD） and poly（1,4-dihydro-2,3-benzodithiin） （PDBD） used as new stored energy materials, were synthesized from alpha, alpha＇-Dichloro-o-xylene. The structures and composition of DBD and PDBD were charactered by EA, H NMR, MS and IR. The properties of PDBD were investigated via cyclic voltammetry and thermal analysis. The cyclic voltammogram of DBD and PDBD exhibit that the oxidation and reduc tion peaks of DBD are at --0. 65V and --1.9V, the redox peak separation of 1. 3V, but the PDBD＇s are 0. 24V, --0. 14 and 0. 38V, respectively. The redox peak separation of PDBD is next to one third of DBD＇s. This phenomenon indicate that polyphenyl can act as electrocatalyst to improve the redox reaction of S-S bond. Meanwhile, the thermal analysis of PDBD exhibit that the S-S bond is stable below 140℃, which show it can be used at lithium battery working temperature range. So, the PDBD can be used as new anode materials of lithium battery in the future.