碳纳米管纸/纳米硅复合电极的锂离子电池性能

采用纳米硅和多壁碳纳米管(MWCNTs)复合材料作为活性材料,以纸纤维为基体,MWCNTs为导电剂制得的MWCNTs导电纸代替铜箔集流体应用于硅基锂离子电池。采用扫描电子显微镜、透射电子显微镜、恒流放电测试、电化学阻抗对复合材料的形貌和电化学性能进行分析。结果表明,采用MWCNTs导电纸-纳米硅复合的锂离子电池在80mA/g的电流密度下,循环50次后比容量达到约1000mAh/g,在2000mA/g大电流密度下仍保持好的循环稳定性。

Performance of Lithium Ion Batteries with Carbon Nanotube Paper/Nano Silicon Composite Electrode

Nano silicon and multiwalled carbon nanotubes(MWCNTs) composites were used as active materials,paper fiber as substrate,MWCNTs as conductive agent,MWCNTs conductive paper was obtained to replace the copper foil current collector and applied in silicon based lithium ion battery.The morphology and the electrochemical performance of the composites were analyzed by scanning electron microscopy (SEM),transmission electron microscopy(TEM),galvanostatic charge-discharge tests and electrochemical impedance spectroscopy(EIS) tests.The results indicate that the lithium ion battery with MWCNTS paper /nano silicon composites reaches a specific capacity of about 1000mAh/g after 50 cycles in the current density of 80mA/g,and has good cycle stability even in the high current density of 2000mA/g.