纳米二氧化锰(MnO2)作为超级电容材料已被广泛研究.为了改善其充放电性能,采用原位化学氧化聚合法制备聚噻吩/纳米MnO2 (PTh/MnO2)复合材料,对纳米MnO2进行性能改性.通过改变聚噻吩在PTh/MnO2复合材料中的掺杂量,制备出一系列的复合材料.采用傅里叶转换红外光谱(FIIR)、X射线衍射仪(XRD)、场发射扫描电子显微镜(FE SEM)和透射电子显微镜(TEM)对PTh/MnO2复合材料的化学性能、晶体结构以及表面形貌等进行了详细考察.接着采用CT001A型电池测试系统对以PTh/MnO2复合材料做负极所制得的密封扣式电池进行了充放电性能测试.结果表明,MnO2和聚噻吩在不同的PTh/MnO2复合材料中形貌各异.当聚噻吩含量为8wt％～10wt％时,MnO2在PTh/MnO2复合材料中分布最为均匀;当聚噻吩含量较高时,MnO2的形貌受到严重影响,其原来的管状结构接近消失.聚噻吩含量的不同,同样也影响了电池的充放电性能.当聚噻吩的含量为20wt％时,在循环20次后,电池的平衡容量为最高,可达700 mAh/g.这明显高于以纳米MnO2为负极时的电池容量.由此可见,聚噻吩对纳米MnO2的充放电性能具有明显的增强作用.该研究为PTh/MnO2复合材料作为电池负极材料的使用提供了实验基础.
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