二茂铁基阳离子表面活性剂改性碳纳米管-硫复合材料对锂硫电池性能的影响  

Influence of ferrocene-based cationic surfactant modified carbon nanotube-sulfur composites on properties of lithium sulfur batteries

作　　者：曹翔宇[1,2] 申羽佳 崔展翔 张敏刚 张秀玲[1] 郭婷婷 闫娟枝 CAO Xiang-yu;SHEN Yu-jia;CUI Zhan-xiang;ZHANG Min-gang;ZHANG Xiu-ling;GUO Ting-ting;YAN Juan-zhi(Department of Materials and Chemical Engineering,Taiyuan University,Taiyuan 030032,China;School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Shanxi University of Electronic Science and Technology,Linfen 041000,China)

机构地区：[1]太原学院材料与化学工程系,山西太原030032 [2]太原科技大学材料科学与工程学院,山西太原030024 [3]山西电子科技学院(筹),山西临汾041000

出　　处：《现代化工》2023年第7期171-175,181,共6页Modern Chemical Industry

基　　金：山西省高等学校科技创新项目(2022L576);大学生创新创业训练项目(20221347)。

摘　　要：以N,N-二甲基二茂铁甲胺与溴代十二烷合成阳离子表面活性剂(甲基二茂铁)十二烷基二甲基溴化铵(FC-DBAB)。用FC-DBAB和十二烷基三甲基溴化铵分别对碳纳米管/硫复合颗粒进行表面改性。利用接触角仪和Zeta电位仪对改性和未改性产品的表面性质进行分析;以改性材料为正极制备组装锂硫电池,并进行电化学性能测试。结果表明,表面改性使碳纳米管/硫复合颗粒表面电负性增大,含有二茂铁基团的表面活性剂改性效果更为显著;改性后的锂硫电池在高倍率下充放电性能更好,二茂铁基团还起到吸附多硫化物、抑制穿梭效应的作用。FC-DBAB-CNTs@S电池在1 C下充放电循环300圈,单圈衰减率为0.1%,比DTAB-CNTs@S电池下降30%。1-Bromoeicosane and(dimethylaminomethyl)ferrocene are synthesized to(ferrocenylmethyl)dodecyldimethylammonium bromide(FC-DBAB),a cationic surfactant.And carbon nanotubes/sulfur composite particles are modified on their surface with FC-DBAB and dodecyl trimethyl ammonium bromide,respectively.The surface properties of modified and unmodified products are analyzed by means of contact angle meter and Zeta potentiometer.The electrochemical properties of lithium sulfur batteries prepared with modified products as cathode are tested through electrochemical impedance test(EIS),cyclic voltampere test(CV),and charge and discharge performance test.It is found that the surface electronegativity of carbon nanotube/sulfur composite particles increases after surface modification,and the modification effect by surfactant-containing ferrocene group is more significant.The charge-discharge performance of modified lithium-sulfur battery is better than the unmodified one at a high current rate.Ferrocene group also plays the roles of absorbing polysulfide and inhibiting the shuttle effect.the FC-DBAB-CNTs@S battery delivers a capacity decay rate of 0.1%after 300 cycles of charges and discharges at 1 C,which is about 30%lower than DTAB-CNTs@S battery.

关 键 词：阳离子表面活性剂 锂硫电池 表面改性 穿梭效应 

分 类 号：TQ152[化学工程—电化学工业]