关键词: 锂硫电池, 硫正极, 高模量碳纤维, 包覆, 聚乙二醇

Abstract: The composite materials contained high modulus carbon fiber (HMCF) were successfully prepared by employing a ball-milling process based on the coating treatment of polyethylene glycol (PEG), and their structures and morphologies were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) techniques．The influences of PEG content on sulfur cathode capacity, cycle stability and rate performance were systematically studied. It was found that by the pre-coating of PEG, the cathode exhibited the high initial discharge specific capacity of 1312.5 mAh•g^-1 at a current rate of 0.2C, and the reversible discharge capacity of 650 mAh•g^-1 was obtained after 50 cycles at a current rate of 200 mA•g^-1, showing the remarkably improved cycling stability.

Key words: Lithium-sulfur battery, sulfur cathode, high modulus carbon fiber, coated, polyethyl-ene glycol