2,5-二巯基-1,3,4噻二唑正极材料的合成及其电化学性能

Synthesis and electrochemical properties of cathode material of 2,5-dimercaptor-1, 3,4-thiadiazole

以水合肼、二硫化碳为原料,三乙胺为催化剂,氢氧化钠为转换剂,硫酸为酸化剂,在85℃乳液聚合得到2,5-二巯基-1,3,4噻二唑(DMcT),用红外光谱鉴定产物的结构;采用交流阻抗法研究PAn,PMOT和CuC2O4对DMcT的电催化作用,测试PAn/DMcT复合正极材料的充放电性能。研究结果表明,最佳反应条件为:n(二硫化碳):n(氢氧化钠):n(水合肼)=3.5:1.5:1,酸化pH值控制在0.6～1.0,此时,产率达到92%;PAn对DMcT的电催化作用明显,使其阻抗从1.28kΩ减小至270Ω;PAn/DMcT复合正极材料首次放电比容量为225mA·h/g,与DMcT的135mA·h/g相比,放电比容量有明显提高。

2, 5-dimercaptor-1, 3, 4-thiadiazole was synthesized by emulsion polymerization method at 85℃ with triethylamine as the accelerating agent, sodium hydroxide as the convert agent, sulfuric acid as the acidulant. The structure of the product was analyzed by infrared spectrum. The AC impedance method was adopted to study the catalysis effect of PAn, PMOT, CUC2O4 and the charge -discharge capacity of PAn/DMcT was tested. The results show that under the optimum reaction condition, i.e. n（CS2）：n（NaOH）：n（N2Ha·H2O）=3.5：15：1 and the acidulant pH=0.6-1.0, the yield reaches up to 92%. The effect of PAn on the electrochemical activity of DMcT is very obvious, and the initial discharge capacity of PAn/DMcT reaches up to 225 mA·h/g, compared with 135 mA·h/g of DMcT.