Xiao Jian, Liu Zhicong, Zhang Wangnian, Deng Ning, Liu Jijun, Zhao Fulai
School of Physics and Electronic Information, Shangrao Normal University, Shangrao 334001, China.
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
Molecules. 2021 Nov 22;26(22):7039. doi: 10.3390/molecules26227039.
A novel soluble copolymer poly(S-MVT) was synthesized using a relatively quick one-pot solvent-free method, inverse vulcanization. Both of the two raw materials are sustainable, i.e., elemental sulfur is a by-product of the petroleum industry and 4-Methyl-5-vinylthiazole (MVT) is a natural monoene compound. The microstructure of poly(S-MVT) was characterized by FT-IR, H NMR, XPS spectroscopy, XRD, DSC SEM, and TEM. Test results indicated that the copolymers possess protonated thiazole nitrogen atoms, meso/macroporous structure, and solubility in tetrahydrofuran and chloroform. Moreover, the improved electronic properties of poly(S-MVT) relative to elemental sulfur have also been investigated by density functional theory (DFT) calculations. The copolymers are utilized successfully as the cathode active material in Li-S batteries. Upon employment, the copolymer with 15% MVT content provided good cycling stability at a capacity of ∼514 mA h g (based on the mass of copolymer) and high Coulombic efficiencies (∼100%) over 100 cycles, as well as great rate performance.
采用一种相对快速的无溶剂一锅法——反向硫化法，合成了一种新型可溶性共聚物聚（S-MVT）。两种原料均具有可持续性，即元素硫是石油工业的副产品，4-甲基-5-乙烯基噻唑（MVT）是一种天然单烯化合物。通过傅里叶变换红外光谱（FT-IR）、核磁共振氢谱（H NMR）、X射线光电子能谱（XPS）、X射线衍射（XRD）、差示扫描量热法（DSC）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对聚（S-MVT）的微观结构进行了表征。测试结果表明，该共聚物具有质子化的噻唑氮原子、介孔/大孔结构，并且可溶于四氢呋喃和氯仿。此外，还通过密度泛函理论（DFT）计算研究了聚（S-MVT）相对于元素硫改善的电子性能。该共聚物成功用作锂硫电池的正极活性材料。使用时，MVT含量为15%的共聚物在约514 mA h g（基于共聚物质量）的容量下提供了良好的循环稳定性，在100次循环中具有高库仑效率（约100%）以及出色的倍率性能。
