摘要
采用共沉淀法制备前驱体Ni1/3Co1/3Mn1/3(OH)2,考察了pH值、温度和搅拌速度等对锂离子电池正极材料LiNi1/3Co1/3Mn1/3O2的影响。采用电化学性能测试、能谱分析、XRD和SEM等方法对LiNi1/3Co1/3Mn1/3O2进行了分析。制备前驱体的最佳工艺条件为pH值12.5,温度50℃,搅拌速度1 000 r/min。此条件制得的前驱体粒度均匀、大小适中,为非晶态,n(Ni)∶n(Co)∶n(Mn)=1.00∶1.03∶1.01。制备的正极材料LiNi1/3Co1/3Mn1/3O2的首次放电比容量为158.4 mAh/g,0.1C循环10次后的放电比容量为151.7 mAh/g,容量损失率为4.2%,具有较好的循环性能。
Precursor Ni1/3Co1/3Mn1/3（ OH）2 was synthesized by co-precipitation method. The effects of pH value, temperature and stirring rate on Li-ion battery cathode material LiNi1/3Co1/3Mn1/3O2 were studied. The LiNi1/3Co1/3Mn1/3O2 was analyzed by electrochemical performance test, energy dispersion analysis, XRD and SEM methods. The optimum process conditions to synthesize the precursor was pH value of 12.5, temperature of 50 ℃ and stirring rate of 1 000 r/min. The precursor prepared at this condition had uniform particle size,suitable dimension, was amorphous and n（Ni） ： n（Co） ： n（Mn） = 1.00： 1.03 ： 1.01. The initial specific discharge capacity of synthesized cathode material LiNi1/3Co1/3Mn1/3O2 was 158.4 mAh/g and the specific discharge capacity was 151.7 mAh/g after 10 cycles （0.1 C）, the capacity loss ratio was 4.2%, which had fine cycle performance.
出处
《电池》
CAS
CSCD
北大核心
2008年第3期169-171,共3页
Battery Bimonthly
