摘要
利用ＸＲＤ、ＴＥＭ、ＩＣＰ、低速ＣＶ以及恒流充放电等方法研究了一种３Ｖ锂离子电池阴极材料的结构及其电化学性能．样品主要由大隧道型结构的钡镁锰矿和层状结构的水羟锰矿组成，该样品的微观形貌为层间距约１０ｎｍ的叠片状结构．Ｌｉ＋在样品中的嵌入脱出过程具有较好的可逆性和循环稳定性．未经提纯的样品前３０次循环的放电比容量达到１２９ｍＡｈ／ｇ，１００次循环后为９６ｍＡｈ／ｇ．材料结构中嵌入隧道及层间的杂质金属阳离子起着结构支撑以及维持材料的微观结构和电化学性能稳定性的作用．
XRD,TEM,ICP,low scan_rate CV and charge/discharge tests were carried out for the studies on the structural and electrochemical behavior of a prepared 3 V manganese oxide cathode for rechargeable lithium ion batteries.XRD analysis revealed that the cathode sample is mainly composed of tunneled Todorokite and layered Vernadite.TEM investigation confirmed that the morphology of the sample is a laminated construction with approximate 10nm layer space.The reversibility of Li + removal/intercalation and structural stability of this sample framework to lithium insertion are good in CV and charge/discharge tests. The discharge capacities were found to be about 129mAh/g obtained on first 30 cycles and remained to be 96mAh/g after 100 charge/discharge cycles.The inlaid cations in the tunnel or interlayer made contribution to the structural and electrochemical stability of this manganese oxide cathode framework.
出处
《电化学》
CAS
CSCD
1999年第1期74-79,共6页
Journal of Electrochemistry
基金
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
福建省自然科学基金
关键词
阴极
锂离子电池
锰氧化物
钡镁锰矿
水羟锰矿
Lithium ion battery, Manganese oxides,Todorokite,Vernadite,structural stability.
