采用化学氧化法,通过改变氧化剂的加入方式,制备了不同结构的五氧化二钒/聚吡咯(V2O5/PPy)复合材料.用四探针测试了材料的电导率,并用比表面积(BET)、X射线粉末衍射(XRD)和扫描电子显微镜(SEM)对复合材料进行了测试和表征.结果表明:氧化剂的加入方式不同,所得复合材料的结构和形貌明显不同.在反应器内先加入氧化剂时,吡咯在V2O5的层间聚合;在反应器内先加入吡咯单体时,吡咯在V2O5的表面吸附聚合.为研究不同结构复合材料的电化学性能,将V2O5/PPy作为锂二次电池正极,组装成扣式电池,采用恒电流充放电及交流阻抗法对复合正极材料进行测试.结果表明:采用先加入氧化剂方式所得材料的电化学综合性能最好,锂二次电池的最高放电比容量达230 mAh/g.
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