采用自蔓延燃烧法合成LiMn(x)Ni(x)Co(1-2x)O2(x=0.25,0.33,0.4.0.45)系列锂离子电池正极材料,通过X射线衍射(XRD)、X射线光电子能谱(XPS)分析研究钴含量的变化对材料结构的影响;利用场发射电子显微镜(FESEM)对材料的形貌进行了表征.由XPS图谱分析,在LiMn(x)Ni(x)Co(1-2x)O2(x=0.25.0.33,0.40,0.45)中.当x为0.4时合成材料中的Mn(3+)和Ni(3+)相对含量较少.在2.5～4.5 V电压范围和0.5C充放电条件下,LiMn(x)Ni(x)Co(1-2x)O2(x=0.25,0.33,0.40.0.45)的初始放电比容量分别为174,177,180和155 mAh·g(-1),循环40次后的容量保持率分别为87.7%,88.0%,90.9%和87.7%,LiMn(0.4)Ni(0.4)Co(0.2)O2的初始放电比容量最高且循环性能最好.在LiMn(x)Ni(x)Co(1-2x)O2(x=0.25,0.33,0.40,0.45)中,随着钴含量的增加,其倍率性能越好.
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