使用喷雾干燥法制备了L i1+2xMn0.3+xNi0.3-3xCr0.4O2 (x＝ 1/60、1/30、1/20、1/15、1/12)系列样品,并借助XRD,SEM,ICP,XPS,IR和Raman等手段对所制备系列样品的结构、价态及电化学性能进行了表征.研究表明,Li1+2xMn0.3+xNi0.3-3xCr0.4O2系列样品均具有典型的富锂层状固溶体型的晶体结构特征,且在其XRD图谱中未观测到任何杂相的存在.然而,XPS的数据表明Cr3+与Cr6+共存于各个样品中,且由于Cr6+的存在使得样品表现出强烈的吸湿性.Cr6+可通过水洗处理去除.对于它们的电化学特征而言,未经水洗处理的样品由于具有强烈的吸湿性,其电化学性能很差.水洗处理后的系列样品表现出典型的三元富锂层状固溶体的电化学行为,其首次放电比容量随着样品中Li和Mn含量的增加而增大.样品Li1.1 7Mn0.38Ni0.05Cr0.4O2的首次放电比容量为203 mA h/g,50次循环后容量保持率为71％.
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