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
张婕 1王菁 1李文鹏 1刘咏 1武文佳1
作者信息
- 1. 郑州大学 化工学院,河南 郑州 450001
- 折叠
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-SO3H,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-SO3H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.
Abstract
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Key words
lithium-sulfur battery/lamellar composite solid electrolyte/COFs nanosheets/crown ether/lithium ion transfer引用本文复制引用
出版年
2024
NETL
NSTL
万方数据