孔道化学环境调变对层状复合电解质锂硫电池性能的影响研究  

Effect of channel chemical environment modulation on the performance of lamellar composite electrolyte based lithium-sulfur battery

作　　者：张婕[1] 王菁 李文鹏[1] 刘咏[1] 武文佳[1] ZHANG Jie;WANG Jing;LI Wenpeng;LIU Yong;WU Wenjia(School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学化工学院,河南郑州450001

出　　处：《生态产业科学与磷氟工程》2024年第6期17-23,40,共8页Eco-industry Science & Phosphorus Fluorine Engineering

摘　　要：制备了3种含有极性基团的共价有机框架(COFs):只含有-C=O,同时含有-C=O和-SO_(3)H,同时含有-C=O和-COOH,超声处理得到COFs纳米片,低压抽滤将冠醚封装到纳米片孔道内,制备出3种层状复合电解质。结果显示,引入带负电阴离子双极性基团的COFs,能够通过静电相互作用限制锂盐阴离子的移动,进一步提高电解质的锂离子传导率;含-COOH的COFs电解质传导率和锂离子迁移数分别为1.15×10^(-5)S/cm和0.64;含-SO_(3)H的COFs电解质传导率和锂离子迁移数分别为1.36×10^(-5)S/cm和0.71,相较含单极性基团COFs制备的电解质,含双极性基团COFs的电解质离子传导率和锂离子迁移数都得到了进一步提升。Three kinds of COFs containing polar groups are prepared,including containing only-C=O,containing both-C=O and-SO3H,and containing both-C=O and-COOH.The COFs nanosheets are obtained after ultrasonic treatment.After low-pressure extraction and filtration,the crown ether is encapsulated into the pore of nanosheets,and three kinds of lamellar composite electrolytes are prepared.The results show that the introduction of dual-polar-group COFs with negative anions can limit the movement of lithium salt anions through electrostatic interactions and further improve the Li^(+)conductivity of electrolyte.The ionic conductivity and lithium ion migration number of COFs containing-COOH are 1.15×10^(-5)S/cm and 0.64;The ionic conductivity and lithium ion migration number of COFs containg-SO3H are 1.36×10^(-5)S/cm and 0.71.Compared with the electrolyte prepared with single-polar-group COFs,the ionic conductivity and lithium ion migration number of electrolytes prepared with dual-polar-group COFs are improved.

关 键 词：锂硫电池 层状复合固态电解质 COFs纳米片 冠醚 锂离子传递 

分 类 号：TM911.3[电气工程—电力电子与电力传动]