采用喷雾干燥法制备锂离子电池用层状富锂锰基正极材料Li(1 +x)Ni0.166Co0.166Mn0.667O(2.175+x/2)(x=0.3,0.4,0.5,0.6),通过X射线衍射(XRD)、扫描电子显微镜(SEM)、等离子体发射光谱(ICP)、热重-差热分析(TG-DSC)、比表面积、粒度分布和恒流充放电等测试手段对材料的结构、形貌及电化学性能进行表征.结果表明:所制得的富锂锰基正极材料为三方层状结构(R(3)m)的LiNi1/3Mnv3Co1/3O2和单斜层状结构(C2/m)的Li2MnO3组成的固溶体,且具有多孔球形形貌.当x=0.4时,材料具有最优的电化学性能.在2.0～4.8 V电压范围内,25 mA/g电流密度下材料的首次放电比容量高达277.5 mA·h/g,20周循环后容量保持率达95.3％,500 mA/g电流密度下放电比容量仍达192.5 mA·h/g.
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