LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2正极材料中SO_4^(2-)的危害及脱除

Harm and removal of SO_4^(2-) in anode material LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2

通过用质量分数2%的NaOH溶液浸湿洗涤前驱体的方法,研究脱除LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2正极材料中以外部吸附和络合盐离子形式存在并对电化学性能有极大危害的SO_4^(2-)杂质问题,对不同SO_4^(2-)含量的锂离子电池循环性能测试.结果表明:低质量分数的SO_4^(2-)(0.28%)的LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2作为锂电池正极材料在30周期后相比于高质量分数的SO_4^(2-)(0.48%)的电极材料有明显较好的充放电循环稳定性100次充放电循环后库仑效率为92%(157.6/171.2mA·h/g).

By means of wetting and washing of the precursor with 2% NaOH solution, the problem of re- moval of SO4^2- inclusion existing in anode material LiNil/3CO1/3Mnl/3O2 in the form of externally complexed and absorbed salty ion is investigated; the inclusion of sulfate ions （SO4^2-） adsorption and complex salt manner which are greatly harmful to electrochemical properties. The cyclic performance of lithium-ion bat- teries with different mass fraction of SO4^2- is tested and the result shows that the charging and discharging stability of LiNi1/3 Co1/3 Mn1/3O2 as anode material of lithium batteries with low mass fraction of SO4^2- （0. 28%） will obviously be better than that with high mass fraction of SO4^2- content （0. 48%）. After 100 cycles of charging and discharging, the coulomb efficiency will be 92% （157. 6/171.2 mA ·h/g）.