五氧化二钒/聚吡咯的制备及其电化学性能  

Preparation of V_2O_5/PPy composites and their electrochemical performance

作　　者：安颢瑗[1] 任丽[1] 王立新[1] 张福强[1] 

机构地区：[1]河北工业大学高分子材料科学与工程研究所,天津300130

出　　处：《复合材料学报》2006年第5期58-62,共5页Acta Materiae Compositae Sinica

基　　金：河北省科技厅博士基金项目(05547003D-4);河北省教育厅科研计划项目(2005356)

摘　　要：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。The composites of polypyrrole （PPy） and vanadium pentoxide （V2O5） were synthesized by chemical oxidative polymerization. By using different methods of adding oxidant, different structure composites were obtained. The conductivities of the composites were measured by a four-probe instrument. The composites were investigated and characterized by BET, XRD and SEM. The results show that the composites obtained by using different methods of adding the oxidant have different structures and morphologies. When the oxidant is added into the reaction vessel first, polypyrrole intercalates into the sandwich of V2O5. When the pyrrole is added into the reaction vessel first, PPy deposits preferentially on the V2O5 particle surface. To study the electrochemical performance of composites, button-type lithium secondary batteries were fabricated with the composites as anodes. The electrochemical properties as anodes were investigated with galvanostatic charge-discharge test and A.C. impedance spectroscopy. It was found that the V2O5/PPy composite obtained by adding oxidant first possessed excellent electrochemical peRformance. The highest discharge capacity of V2O5/PPy anode reached 230 mAh/g.

关 键 词：聚吡咯 五氧化二钒 正极 电化学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]