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Co4S3-modified Honeycombed Carbon Film With abundant Pores for Lithium-Sulfur Batteries

Authors： ZHENG Wenji, DONG Zheiwei, HE Gaohong, JIANG Helong, JIANG Xiaobin, WU Xuemei, DAI Yan, LI Xiangcun

Units： 1.School of Chemical Engineering, Panjin, State Key Laboratory of Fine Chemicals, Membrane Science and Technology Research and Development Center, Dalian University of Technology, Panjin 116024, China; 2. School of Chemical Engineering, State Key Laboratory of Fine Chemicals, Membrane Science and Technology Research and Development Center, Dalian University of Technology, Dalian 116024, China; 3. Panjin Institute of Industrial Technology, Dalian University of Technology, Panjin 124221, China

KeyWords： phase inversion; 1-pentanol; honeycomb pore structure; carbon film; lithium-sulfur batteries

ClassificationCode：TQ152

year,volume(issue):pagination： 2023,43(6):8-19

Abstract：

In this paper, Co4S3-modified honeycombed carbon film (Co4S3@DH-NC) with abundant pores was prepared by carbonization and vulcanization of ZIF-67/CNT/PAN film, which was constructed through phase conversion method using 1-Pentanol as solvent. XRD results demonstrated the successful synthesis of Co4S3 with a loading of up to 19.5%. The honeycombed porous structure can effectively promote the uniform dispersion of electrolyte and polysulfide in the film. Co4S3 was uniformly loaded inside the honeycomb structure, in which the more electronegative S element facilitated the adsorption of polysulfide. The highly conductive network with CNT as a backbone promoted the catalytic conversion of polysulfides by Co4S3. As a result, the lithium-sulfur battery with Co4S3@DH-NC as an interlayer retained a specific capacity of 581.3 mA h/g and coulomb efficiency of about 100 % after 400 cycles at 4 C. The deposited discharge specific capacity of Li2S was 681.811 mAh/ g, which was higher than that of DH-NC (43.034 mAh/g), demonstrating the significance for Co4S3@DH-NC to adsorb and catalytic polysulfides.

Funds：

国家自然科学基金项目（21978035, 22178041）

AuthorIntro：

郑文姬（1982-），女，辽宁大连人，副教授，博士，研究方向气体膜分离；无机膜以及杂化膜的设计与制备；先进纳米材料，E-mail：zhengwenji@dlut.edu.cn

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