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化工学报  2014 

Ni/Al-LDH/MCNTs原位复合材料的制备与电化学性能

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Keywords: Ni/Al双氢氧化物,多壁碳纳米管,纳米材料,电化学,合成

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Abstract:

以Ni(NO3)2·6H2O、Al(NO3)3·9H2O、尿素和MCNTs为原料,采用原位均相沉淀法制备了MCNTs含量分别为1wt.%、3wt.%和5wt.%的Ni/Al-LDH/MCNTs复合电极活性材料。采用X-射线衍射(XRD)、傅立叶变换红外光谱(FT-IR)和场发射扫描电子显微镜(FESEM)表征了材料的微观结构和形貌;采用循环伏安(CV)、电化学交流阻抗(EIS)和充放电测试研究了该复合材料作为镍氢电池正极材料的电化学性能。结果表明,在Ni/Al-LDH中复合MCNTs能够提高材料的电化学活性,降低电化学反应电阻,显著改善材料的大电流充放电性能。其中MCNTs含量为3wt.%的Ni/Al-LDH/MCNTs复合材料具有最佳的电化学性能,在200mA/g、500mA/g、1000mA/g和2000mA/g电流密度下的放电比容量分别为330mAh/g、321mAh/g、307mAh/g和288mAh/g,而未复合MCNTs的Ni/Al-LDH在2000mA/g电流密度下放电比容量仅为205mAh/g。

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