【摘要】 以硝酸盐为原料,用溶胶-凝胶法合成锂离子电池正极材料LiNi0.8-xCo0.2AlxO2(x=0.01,0.03,0.05,0.07),采用XRD、SEM和电化学测试等方法对材料的物理化学性质以及电化学性能进行表征。结果表明,经过Al掺杂后,材料具有较高的初始放电比容量和容量保持率。在750℃下合成的LiNi0.77Co0.2Al0.03O2在3.0～4.2V,以0.2C恒电流充放电测试,其首次放电容量为164.9mAh/g,经过50次充放电循环后放电容量为149.5mAh/g,可逆容量的保持率为90.66%。更多还原

【Abstract】 LiNi0.8-xCo0.2AlxO2 as cathode material for lithium ion battery have been successfully synthesized through a sol-gel method, characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and electrochemical tests. The results showed that the Al-doping sample had high discharge capacity and good cycling performance. The initial capacity of LiNi0.77Co0.2Al0.03O2 synthesized under 750℃ was 164.9mAh/g. After 50 cycles (from 3.0V to 4.2V ,at 0.2C), the sample preserved 90.66% of the initial discharge capacity( 149.5mAh/g), showing perfect cyclic stability.更多还原