锂离子电池新型正极材料——二氧化锰纳米纤维嵌锂行为的研究; Novel cathode material for lithium ion batteries Investigation of the intercalation behavior of manganese dioxide nano fiber | |
尤金跨 ; 杨勇 ; 舒东 ; 张英春 ; 林祖赓 | |
1999 | |
关键词 | 锂离子电池 二氧化锰纳米纤维 锂锰氧化物 lithium ion battery manganese dioxide nano fiber lithium manganese oxide |
英文摘要 | 采用TEM、Xrd分析等方法对新型二氧化锰纳米纤维电极材料进行表征,TEM观测结果显示这种锰材料是由许多二氧化锰纳米纤维缠绕成巢状,其纤维直径约为1nM~10nM之间;从Xrd分析表明,它是一种复合结构的锰氧化物,以钡镁锰矿为主体结构,并含有其他钠水锰矿及水羟锰矿结构。从样品电极在1MOl/llIClO4的PC-dME(1∶1)溶剂中的循环伏安曲线,可以看出在扫描的电压范围内,在3.8V和2.8V附近出现一对可逆对称的氧化还原峰,它对应于二氧化锰纳米纤维电极中锂离子的脱出-嵌入反应。通过二氧化锰纳米纤维电极在不同电流密度下的放电,可以看出该电极采用小电流放电(0.24MA/CM2),其容量可达到约190MAH/g,而且具有3V的放电平台;而在较大的电流密度(0.96MA/CM2)放电仍具有约150MAH/g的放电容量。可见,该电极具有良好的负荷特性和较高的放电容量。; A novel cathode material (MnO 2) has been characterized by using transmission electron microscope (TEM) and X ray diffraction (XRD). From the TEM examination, it was found that the MnO 2 has a distinct birds nest shaped nano fiber with the diameter in the range of 1nm~10 nm. XRD data shows that the MnO 2 has a complex structure that is in the form of todorokite (3×3 tunnel) birnessite, and vernadite structure. Cyclic voltammetry has been performed in 1 mol/L LiClO 4的PC DME(1∶1) electrolyte solution. It can be seen that a pair of reversible redox peaks, which mainly occurs in the potential ranged from 2.8 to 3.8 V vs.Li/Li +, it can be described by a lithium intercalation mechanism. The galvanostatic charge discharge experiments at various current density reveal that the MnO 2 nano fiber electrodes have a high electrochemical performance and stability. The reversible capacity can reach 190 mAh/g, 150 mAh/g at lower and higher current density respectively, i.e. 0.24mA/cm 2 and 0.96mA/cm 2.; 国家“863”高技术发展计划课题;中国大洋矿产资源研究开发课题;国家自然科学基金 |
语种 | zh_CN |
内容类型 | 期刊论文 |
源URL | [http://dspace.xmu.edu.cn/handle/2288/107708] ![]() |
专题 | 化学化工-已发表论文 |
推荐引用方式 GB/T 7714 | 尤金跨,杨勇,舒东,等. 锂离子电池新型正极材料——二氧化锰纳米纤维嵌锂行为的研究, Novel cathode material for lithium ion batteries Investigation of the intercalation behavior of manganese dioxide nano fiber[J],1999. |
APA | 尤金跨,杨勇,舒东,张英春,&林祖赓.(1999).锂离子电池新型正极材料——二氧化锰纳米纤维嵌锂行为的研究.. |
MLA | 尤金跨,et al."锂离子电池新型正极材料——二氧化锰纳米纤维嵌锂行为的研究".(1999). |
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