Li-birnessite型层状二氧化锰的合成及电化学性能  

Preparation and Electrochemical Properties of Layered Manganese Oxide(Li-birnessite Type)

作　　者：黄行康[1,2] 常海涛[1] 甘健龙[1] 张清顺[1] 岳红军[2] 吕东平[2] 杨勇[2] 

机构地区：[1]福建南平南孚电池有限公司,福建南平353000 [2]厦门大学固体表面物理化学国家重点实验室,化学系,福建厦门361005

出　　处：《电化学》2009年第2期194-197,共4页Journal of Electrochemistry

基　　金：纳米科技重大计划(90606015)课题资助

摘　　要：采用O2氧化法在碱性条件下氧化Mn2+,制备Li-birnessite型层状MnO2.X射线衍射、扫描电子显微镜、BET、热重等技术表征MnO2样品的性能.以放充电法测试Li-birnessite正极材料性能.结果表明,Li-birnessite结晶良好,层间距约为0.70 nm,呈球状或类球状.以Li-birnessite为正极材料的扣式电池在0.2 C(40 mA/g)条件下放电时容量高达203 mAh/g,且具有良好的倍率性能.Layered Li-birnessite was prepared by means of oxidizing Mn^2 ＋ with O2 gas in alkaline media. The as-prepared sample was characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, BET and thermogravimetric/diffenential thermal analysis （TG/DTA） techniques. The electrochemical properties of the material were also investigated. The results show that such a Li-birnessite consists of well-crystallized spherical particles with an interlayer distance of 0.70 nm. The Li-birnessite delivered a high discharge capacity of 203 mAh/g at a rate of 0.2 C （40 mA/g）, and had good rate capability as well.

关 键 词：层状二氧化锰 Li—birnessite 可充性锂电池 电化学性能 

分 类 号：TM910.4[电气工程—电力电子与电力传动]