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由Co-Ni-Mn合金出发,采用电解方法合成了含3种过渡金属元素的前驱物,再利用该前驱物制备了锂离子二次电池正极材料LiCo1/3Ni1/3Mn1/3。XRD测试结果表明通过该方法制备的正极材料具有较好的层状结构,SEM测试则显示材料由规则形状的1μm左右颗粒组成。通过XPS实验证明Co、Ni、Mn3种过渡金属元素在该材料中的价态分别为+3,+2,+4。采用循环伏安法对材料的电化学行为进行了研究,表明该材料具有较好的充放电可逆性。该材料在150mA·g-1电流下经过50周的恒电流充放循环后容量仍能保持在160mAh·g-1。
Starting from Co-Ni-Mn alloy, three kinds of precursors containing transition metal elements were synthesized by electrolysis method. LiCo1 / 3Ni1 / 3Mn1 / 3 as cathode materials for lithium ion secondary batteries were prepared by using the precursor. The XRD results show that the cathode material prepared by this method has a good layered structure, while the SEM test shows that the material is composed of regularly shaped particles with a size of about 1 μm. The XPS experiments show that the valences of the three transition metals Co, Ni and Mn in the material are +3, +2, and +4, respectively. The electrochemical behavior of the material was studied by cyclic voltammetry, which shows that the material has good charge-discharge reversibility. The material can still maintain the capacity of 160mAh · g-1 after 50 cycles of constant current charge-discharge at a current of 150mA · g-1.