中文摘要：

采用O2氧化法在碱性条件下氧化Mn^2＋，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—bimessite正极材料性能．结果表明，Li-birnessite结晶良好，层间距约为0．70nm，呈球状或类球状．以Li—birnessite为正极材料的扣式电池在0．2C（40mA／g）条件下放电时容量高达203mAh／g，且具有良好的倍率性能．

英文摘要：

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.