锂蓄电池正极复合材料PEG_xPANI_yVXG的研究  

Study of PEG_xPANI_y VXG composite as positive electrode active material for lithium secondary battery

作　　者：郭丽 吴益华[2] 吴晓梅[2] 

机构地区：[1]武汉船用电力推进装置研究所,湖北武汉430064 [2]上海交通大学化学系,上海200240

出　　处：《电源技术》2004年第6期342-344,347,共4页Chinese Journal of Power Sources

摘　　要：利用一种新的合成方法,即先利用水溶性离子导电聚合物聚乙二醇(PEG)撑开层状氧化物五氧化二钒干凝胶(VXG)的层间距,合成出PEGxVXG干凝胶复合材料后,再加入苯胺通过边嵌入边聚合的方法,合成出不同摩尔配比的三组分复合材料PEGxPANIyVXG。材料的离子导电率较VXG提高了1～2个数量级,电子导电率提高了3个数量级。以氧处理后的PEGxPANIyVXG复合材料为正极活性物质制备CR2025型钮扣锂蓄电池作充放电试验,C/12放电率下初次放电的比容量在208～230mAh/g之间;间歇电位滴定(PITT)法测量Li+在复合材料中的扩散系数高于VXG约1～2个数量级。Three-ingredient PEG x PANI y VXG composite was synthesized by a new method in which soluble polymer PEG was in intercalated into the layer of VXG and then aniline was added and in-situ intercalation and polymerization occurred. Results show that the electrical conductivity of the composite increases three orders of magnitude than VXG at least. The oxidized products were used as the positive active material to assemble CR2025 lithium secondary coin cell and then carried out mea-surements such as constant current charge-discharge and PITT. Under the moderate discharge rate(C/12),the first discharge ca-pacity is average among 208～230 mAh/g. The result of PITT indicates that the diffusion coefficient of lithium ion in PEG x -PANI y VXG is higher about 1～2 orders of magnitude than that in VXG.

关 键 词：锂蓄电池 嵌入化合物 五氧化二钒干凝胶(VXG) 聚乙二醇(PEG) 聚苯胺(PANI) 

分 类 号：TM912.9[电气工程—电力电子与电力传动]