致密球形正极材料LiNi_(0.6)Co_(0.2)Mn_(0.2)O_2的制备及性能  

Preparation and performance of LiNi_(0.6)Co_(0.2)Mn_(0.2)O_2 as high density and spherical cathode material

作　　者：李平[1] 许国峰[1] 崔菲菲[2] 

机构地区：[1]中国电子科技集团公司第十八研究所,天津300384 [2]海军装备部,北京100841

出　　处：《电源技术》2013年第6期944-946,共3页Chinese Journal of Power Sources

摘　　要：采用化学共沉淀法预先合成致密球形前驱体Ni0.6Co0.2Mn0.2(OH)2,再与锂源共混煅烧合成具有高振实密度的LiNi0.6Co0.2Mn0.2O2。探讨了不同的合成条件对材料性能的影响。最佳合成条件下的产物振实密度≥2.5 g/cm3,中粒径D50为10μm左右。X射线衍射(XRD)结果表明:产物具有标准的层状α-NaFeO2晶型,为层状嵌锂复合氧化物。扫描电子显微镜(SEM)显示材料具有良好的球形形貌。在2.75～4.3 V电位区间内,材料首次放电比容量为172.1 mAh/g,首次充放电效率为90.1%。10次循环后放电比容量为171.3 mAh/g,充放电效率为99.7%。High tap-density spherical precursor Ni0.6Co0.2Mn0.2（OH）2 was synthesized by chemistry co-precipitation method as raw material, which was then blended with Li2CO3 and incinerated, and gained the LiNi0.6 Co0.2Mn0.2O2 with high tap-density. The influence of different synthesizing conditions on the materials characteristic was investigated. The product synthesized with best condition has tap-density of D≥2.5 g/cm3, and middle particle of D50≈ 10 μm. The X-ray diffraction （XRD） indicates that the material can be indexed by a hexagonal α-NaFeO2 layer structure. The scanning electron microscope （SEM） indicates that the material has favorable spherical pattern. The initial discharge specific capacity is 172.1 mAh/g at 2.75-4.30 V, and the rate of the charge-discharge is 90.1% for the first time. Up to 10 cycles, the discharge specific capacity is 171.3 mAh/g, and the rate of the charge-discharge is 99.7%.

关 键 词：正极材料 LINI0 6 CO0 2Mn0 2O22 前驱体 高致密 共沉淀法 

分 类 号：TM912[电气工程—电力电子与电力传动]