Guo Yafang, Jiang Aihua, Tao Zengren, Yang Zhiyun, Zeng Yaping, Xiao Jianrong
College of Science, Guilin University of Technology, Guilin, China.
Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, Guilin University of Technology, Guilin, China.
Front Chem. 2018 Jun 14;6:222. doi: 10.3389/fchem.2018.00222. eCollection 2018.
To inhibit the polysulfide-diffusion in lithium sulfur (Li-S) batteries and improve the electrochemical properties, the commercial polypropylene (PP) was decorated by an active carbon (AC) coating with lots of electronegative oxygenic functional group of -OH. Owing to the strong adsorption of AC and the electrostatic repulsion between the -OH and negatively charged polysulfide ions, the Li-S batteries demonstrated a high initial discharge capacity of 1,656 mAh g (approximately 99% utilization of sulfur) and the capacity can still remain at 830 mAh g after 100 cycles at 0.2 C. Moreover, when the rate was increased to 1 C, the batteries could also possess a discharge capacity of 1,143 mAh g. The encouraging cycling stability make clear that this facile approach can successfully restrain the shuttle effect of polysulfides and make further progress to the practical application of Li-S batteries.
为抑制锂硫（Li-S）电池中的多硫化物扩散并改善其电化学性能，商用聚丙烯（PP）通过具有大量带负电的 -OH 含氧官能团的活性炭（AC）涂层进行修饰。由于 AC 的强吸附作用以及 -OH 与带负电的多硫化物离子之间的静电排斥，Li-S 电池展现出 1656 mAh g 的高初始放电容量（硫利用率约为 99%），并且在 0.2 C 下循环 100 次后容量仍可保持在 830 mAh g。此外，当倍率增加到 1 C 时，电池仍可拥有 1143 mAh g 的放电容量。令人鼓舞的循环稳定性表明，这种简便方法能够成功抑制多硫化物的穿梭效应，并推动 Li-S 电池在实际应用中取得进一步进展。
