LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2正极材料的制备及性能  

Synthesis and electrochemical characteristics of LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2 cathode material for Li-ion batteries

作　　者：刘相涛[1] 朱令之[1] 韩恩山[1] 吴志芹[1] 潘超[1] 

机构地区：[1]河北工业大学化工学院,天津300130

出　　处：《电池工业》2012年第6期344-349,共6页Chinese Battery Industry

摘　　要：以Na2CO3和NH4HCO3为混合沉淀剂的碳酸盐共沉淀法合成了锂离子电池正极材料LiNi0.4Co0.2Mn0.4O2,并研究了Na2CO3和NH4HCO3与金属离子间的比例、NH4HCO3的浓度对其电化学性能的影响。当Na2CO3和NH4HCO3与金属离子的物质的量比值分别为1.25∶1和0.25∶1,NH4HCO3的浓度为0.375mol/L时,合成的样品具有最好的电化学性能。在2.8～4.4V,0.1C下进行充放电测试,首次放电比容量达到165.1mAh/g,以不同倍率循环50次后,容量保持率为91.5%。Uniform and spherical cathode material LiNi0.4 Co0.2Mn0.4O2 for Li-ion batteries were synthesized via Na2 CO3 and NH4 HCO3 as precipitating agent by carbonate co-precipitation meth- od. The ratio of coordination agent to metal ion and the concentration of NH4 HCO3 were stud- ied. The experiment results showed that the best synthetic process was as follows： the ratio of Na2CO3 and NH4HCO3 precipitator to the metal salt solution was 1.25 and 0.25; the concentra- tion of NH4HCO3 was 0. 375 mol/L. Under the best conditions , the discharge capacity of LiNi0.4Co0.2Mn0.402 could reach 165.1 mAh/g in the voltage range from 2.8V to 4.4 V, and its discharge capacity retention was 91.5% after 50 cycles at different rate.

关 键 词：锂离子电池 碳酸盐共沉淀法 LINI0 4Co0 2Mn0 4O2 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]