碳纳米管多微孔集流体对氧化锡锂离子电池性能的影响

Effect of Carbon Nanotubes Multi-microporous Collector on Performance of SnO_2 Lithium Ion Batteries

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多微孔结构的导电纸。将MWCNTs导电纸作为负极集流体代替铜箔应用于氧化锡锂离子电池。采用场发射扫描电镜(SEM)进行表征。SEM显示,Sn O2均匀地分布在MWCNTs构建的三维导电网络的孔隙中。对循环后的MWCNTs导电纸负载Sn O2极片进行EDS元素分析,结果表明,三维多微孔集流体能充分均匀吸附Sn O2浆料,从而保证基体材料的结构稳定性和化学稳定性。电化学测试表明,MWCNTs导电纸作为负极材料Sn O2的集流体能够有效改善电池性能。在100 m A/g电流密度放电时,60次循环后比容量为580 m Ah/g,逐渐增大电流密度时电池比容量下降较为平缓,库伦效率保持在97%以上。

Cellulose fibers were used as the matrix and MWCNTs were used as conductive agent.The MWCNT conductive paper was used as cathode current collector instead of copper foil.The field emission scanning electron microscopy(SEM)was used for characterization.The results showed that SnO2 was well dispersed in network of MWCNTs conductive paper.The results showed that the three-dimensional microporous current collector can fully adsorb the SnO2 slurry,which could ensure the structural stability and chemical stability of the SnO2 electrode.The electrochemical tests showed that the specific capacity of the SnO2 electrode reached 580 mAh/g at the current density of 100 mA/g after 60 cycles,and coulombic efficiency mantained more than 97%.