Synthesis and electrochemical performance of Lib>1+xb>Nib>0.5b>Mnb>0.3b>Cob>0.2b>Ob>2+未b> (0 鈮?#xa0;x 鈮?#xa0;0.15) cathode materials for lithium-ion batteries

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• 作者：Juanjuan Liu ; Jun Wang ; Yonggao Xia ; Xufeng Zhou ; Yaletu Saixi ; Zhaoping Liu ; ^{liuzp@nimte.ac.cn}
• 关键词：A. Layered compounds ; B. Chemical synthesis ; C. Electrochemical measurements ; D. Electrochemical properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：March, 2012
• 卷：47
• 期：3
• 页码：807-812
• 文件大小：1121 K

摘要

In this work, layered lithium-excess materials Lib>1+xb>Nib>0.5b>Mnb>0.3b>Cob>0.2b>Ob>2+未b> (x = 0, 0.05, 0.10 and 0.15), of spherical morphology with primary nanoparticles assembled in secondary microspheres, were synthesized by a coprecipitation method. The effects of lithium content on the structure and electrochemical performance of these materials were evaluated by employing X-ray diffraction (XRD), inductive coupled plasma (ICP), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and galvanostatic charge/discharge tests. It is found that Lib>1.10b>Nib>0.5b>Mnb>0.3b>Cob>0.2b>Ob>2+未b>, i.e., Li[(Nib>0.5b>Mnb>0.3b>Cob>0.2b>)b>0.95b>Lib>0.05b>]Ob>2b> showed the best electrochemical performance due to the highly ordered layered structure, reduced cation mixing and the lowest charge transfer resistance. Lib>1.10b>Nib>0.5b>Mnb>0.3b>Cob>0.2b>Ob>2+未b> delivered a discharge capacity of 145 mA h g^鈭? at 125 mA g^鈭? in the cut-off voltage of 2.5-4.3 V, and had a capacity retention of 100%after 50 cycles at room temperature.