Co_(4)S_(3)修饰蜂窝状多孔碳膜用于锂硫电池  

Co_(4)S_(3)-modified honeycombed carbon film with abundant pores for lithium-sulfur batteries

作　　者：郑文姬[1] 董志伟 于淼[2] 贺高红[1,2] 姜贺龙 姜晓滨[2] 吴雪梅[1,2] 代岩 李祥村[2] ZHENG Wenji;DONG Zhiwei;YU Miao;HE Gaohong;JIANG Helong;JIANG Xiaobin;WU Xuemei;DAI Yan;LI Xiangcun(School of Chemical Engineering,Panjin,State Key Laboratory of Fine Chemicals,Membrane Science and Technology Research and Development Center,Dalian University of Technology,Panjin 124221,China;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;Panjin Institute of Industrial Technology,Dalian University of Technology,Panjin 124221,China)

机构地区：[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,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,大连116024 [3]大连理工大学盘锦产业技术研究院,盘锦124221

出　　处：《膜科学与技术》2023年第6期8-19,28,共13页Membrane Science and Technology

基　　金：国家自然科学基金项目(21978035,22178041)。

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Co_(4)S_(3)修饰的蜂窝状多孔碳膜(Co_(4)S_(3)@DH-NC)。XRD表征结果证明了Co_(4)S_(3)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;Co_(4)S_(3)均匀负载于蜂窝状结构内部,电负性更强的S有利于Co_(4)S_(3)吸附多硫化物;CNT为骨架的高导电网络促进了Co_(4)S_(3)对多硫化物的催化转化。以Co_(4)S_(3)@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Co_(4)S_(3)@DH-NC吸附催化多硫化物能力的提升。In this paper,Co_(4)S_(3)-modified honeycombed carbon film(Co_(4)S_(3)@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 Co_(4)S_(3)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.Co_(4)S_(3)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 Co_(4)S_(3).As a result,the lithium-sulfur battery with Co_(4)S_(3)@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 Co_(4)S_(3)@DH-NC to adsorb and catalytic polysulfides.

关 键 词：相转化法 正戊醇 蜂窝状多孔 碳膜 锂硫电池 

分 类 号：TQ152[化学工程—电化学工业]