多壁碳纳米管纸作正极集流体的锂硫电池性能

发布时间：2018-02-05 19:21

  本文关键词： 锂硫电池 碳纳米管 导电纸 集流体 库伦效率　出处：《复合材料学报》2017年04期 　论文类型：期刊论文

【摘要】：为了改善锂硫电池的循环性能,以纸纤维为基体,多壁碳纳米管(MWCNTs)为导电剂,采用真空抽滤法制得MWCNTs导电纸,并将MWCNTs导电纸作为正极集流体代替铝箔应用于锂硫电池。对MWCNTs导电纸进行了形貌结构表征和电化学性能测试,并对循环后的MWCNTs导电纸电极进行EDS检测。结果显示,MWCNTs均匀地附着在纸纤维基体上,多空隙的MWCNTs导电纸三维结构明显。采用MWCNTs导电纸作集流体的锂硫电池在0.05C和1C倍率充放电下循环30次,比容量分别保持615mAh/g、496mAh/g,库伦效率达97.5%以上,且电荷转移电阻在循环后降低。EDS元素分析结果证实MWCNTs导电纸对多硫化锂有吸附作用,从而一定程度抑制了锂硫电池的穿梭效应。因此,以MWCNTs导电纸作为集流体能有效增加活性物质硫的负载量和接触面积,使锂硫电池具有良好的循环稳定性和库伦效率性能。
[Abstract]:In order to improve the cycle performance of lithium-sulfur batteries, MWCNTs conductive paper was prepared by vacuum filtration with paper fiber as matrix and MWCNTs as conductive agent. MWCNTs conductive paper was used as positive collector instead of aluminum foil in lithium-sulfur battery. The morphology and structure of MWCNTs conductive paper were characterized and electrochemical properties were tested. The MWCNTs conductive paper electrode was detected by EDS. The results showed that the MWCNTs was uniformly attached to the paper fiber matrix. The three-dimensional structure of MWCNTs conductive paper with multiple voids was obvious. The lithium-sulfur battery with MWCNTs conductive paper as the collector fluid was recirculated 30 times at the charge / discharge rate of 0.05 C and 1 C. The specific capacity maintained 615mAh/ g and 496mAh.grespectively, and the Coulomb efficiency was more than 97.5%. The results of EDS elemental analysis show that MWCNTs conductive paper can adsorb lithium polysulfide, which inhibits the shuttle effect of lithium-sulfur battery to some extent. MWCNTs conductive paper can effectively increase the loading amount and contact area of active sulfur and make the lithium-sulfur battery have good cycling stability and Coulomb efficiency.
【作者单位】： 南昌大学机电工程学院;
【基金】：江西省研究生创新专项资金(YC2015-S012)
【分类号】：TS761.2;TM912

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