膜科学与技术

Co4S3修饰蜂窝状多孔碳膜用于锂硫电池

作者：郑文姬，董志伟，于淼，贺高红，姜贺龙，姜晓滨，吴雪梅，代岩，李祥村

单位： 1. 大连理工大学化工学院盘锦分院，精细化工国家重点实验室，膜科学与技术研究开发中心，辽宁盘锦 124221；2. 大连理工大学化工学院精细化工国家重点实验室，膜科学与技术研究开发中心，，辽宁大连 116024；3. 大连理工大学盘锦产业技术研究院，，辽宁盘锦 124221

关键词：相转化法；正戊醇；蜂窝状多孔；碳膜；锂硫电池

DOI号：

分类号： TQ152

出版年,卷(期):页码： 2023,43(6):8-19

摘要：

以低交换速率的正戊醇作为溶剂，通过相转化法制备了内部结构均一无大孔结构的ZIF-67/CNT/PAN相转化膜，再经硫化、碳化后制备了Co4S3修饰的蜂窝状多孔碳膜（Co4S3@DH-NC）。XRD表征结果证明了Co4S3的成功合成，其负载量高达19.5%（质量分数）。蜂窝状多孔结构可以有效促进电解液以及多硫化物在膜内的均匀分散；Co4S3均匀负载于蜂窝状结构内部，电负性更强的S有利于Co4S3吸附多硫化物；CNT为骨架的高导电网络促进了Co4S3对多硫化物的催化转化。以Co4S3@DH-NC为隔层的锂硫电池在4 C下循环400圈后比容量能保有581.3 mA h/g，库仑效率为100 %左右。Li2S的沉积放电比容量为681.811 mAh/g，相较于DH-NC（43.034 mAh/g）更高，证明了Co4S3@DH-NC吸附催化多硫化物能力的提升。

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.

基金项目：

国家自然科学基金项目（21978035, 22178041）

作者简介：

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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