结合共沉淀法和高温固相法合成了一系列La掺杂的层状氧化物正极材料LiNi0.8-xCo0.1Mn0.1LaxO2(x=0,0.01,0.03),研究La对LiNi0.8Co0.1Mn0.1O2材料的影响.通过XRD数据观察到了La2Li0.5Co0.5O4新相的生成,通过Rietveld精修软件计算了第二相的含量.电化学性能测试结果表明La掺杂之后材料的循环稳定性从74.3%上升到95.2%,而首次比容量从202 mA·h/g降低到了192 mA·h/g,循环稳定性的提高可以归因于新相的产生一方面消耗了材料中的杂质,另一方面粘附在颗粒表面保护材料不受电解液的腐蚀.CV测试结果表明与未掺杂的材料相比,掺杂后的样品电化学可逆性更好.
A series of layered LiNi0.8?xCo0.1Mn0.1LaxO2 (x=0, 0.01, 0.03) cathode materials were synthesized by combining co-precipitation and high temperature solid state reaction to investigate the effect of La-doping on LiNi0.8Co0.1Mn0.1O2. A new phase La2Li0.5Co0.5O4 was observed by XRD, and the content of the new phase could be determined by Retiveld refinement and calculation. The cycle stability of the material is obviously increased from 74.3% to 95.2% after La-doping, while the initial capacity exhibits a decline trend from 202 mA·h/g to 192 mA·h/g. The enhanced cycle stability comes from both of the decrease of impurity and the protection of newly formed La2Li0.5Co0.5O4, which prevents the electrolytic corrosion to the active material. The CV measurement confirms that La-doped material exhibits better reversibility compared with the pristine material.
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