Study on properties of polypyrrole-coated sulfur-based composite prepared by drop addition method

doi:10.12028/j.issn.2095-4239.2018.0034

Abstract

Abstract: S/PPy composite materials with different mass ratios (the weight of sulfur to that of polypyrrole) of 6:4, 7:3, 8:2 were prepared by coating polypyrrole (PPy) on the surface of sulfur with a solution drop addition method to investigate the optimum synthesis condition. The structure and electrochemical properties of S/PPy composites were studied by means of X-ray diffraction (XRD), Fourier transform infrared spectrum analysis (FTIR), field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM) and electrochemical measurements. And the morphology observation results show that PPy granules disperse uniformly and exert outstanding covering effect when mass ratio of sulfur and PPy is 7:3 (S/PPy-30). Furthermore, S/PPy-30 composite manifests best electrochemical performance, which displays high initial discharge capacity of 1151 mA·h·g^-1 and maintains 623 mA·h·g^-1 after 120 cycles at a current density of 200 mA·g^-1. And S/PPy-30 presents distinctive advantage in rate capacity compared to the other two S/PPy materials.

Key words: lithium-sulfur batteries, cathode material, polypyrrole, composite

CLC Number:

TM911

SONG Yuguo, XU Jiaohui, LIU Mingyu, CHEN Xiao, JIN Bo, JIANG Qing. Study on properties of polypyrrole-coated sulfur-based composite prepared by drop addition method[J]. Energy Storage Science and Technology, 2018, 7(3): 502-511.

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