A novel thioether containing conjugative polymer, poly(tetrahydrobenzodithiophene) (PTBDT), with high discharge specific capacity as the cathode material for lithium batteries, has been synthesized chemically. The polymer has been characterized by elemental analysis, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The cyclic voltammogram of the polymer shows multiple redox peaks. The charge–discharge tests show stable discharge specific capacity about 560 mAh g⁻¹ and the maximal capacity of 820 mAh g⁻¹, and discharge voltage about 2.3 V. The results indicate that the thioether bonds of the polymer are involved in the electrode reaction. It is tentatively proposed that the thioether cations are formed during the redox reaction on the cathode. The reversible redox reaction on thioether bonds that is a multi-electron process offers a high specific capacity, and low discharge voltages.

化学合成了一种新型的含硫醚的共轭聚合物，聚四氢苯并二噻吩（PTBDT），具有高放电比容量，可作为锂电池的正极材料。该聚合物已通过元素分析，X射线光电子能谱（XPS），傅里叶变换红外光谱（FT-IR），X射线衍射（XRD）和热重分析（TGA）进行了表征。聚合物的循环伏安图显示多个氧化还原峰。充放电测试显示稳定的放电比容量约为560 mAh g ^-1，最大容量为820 mAh g ^-1，放电电压约为2.3V。结果表明，聚合物的硫醚键参与了电极反应。暂时提出在氧化还原反应期间在阴极上形成硫醚阳离子。硫醚键上的可逆氧化还原反应是一种多电子过程，具有较高的比容量和较低的放电电压。