正极材料Li[Ni_(1-x-y)Co_xM_y]O_2(M=Al、Mn)的合成与性能  

Synthesis and characterization of cathode materials Li[Ni_(1-x-y)Co_xM_y]O_2(M=Al、Mn)

作　　者：高俊奎[1] 徐强[1] 张绍丽[2] 

机构地区：[1]天津大学化工学院,天津300072 [2]天津力神电池股份有限公司,天津300384

出　　处：《电源技术》2007年第10期796-799,共4页Chinese Journal of Power Sources

摘　　要：采用共沉淀法合成了锂离子蓄电池Li[Ni(1-x-y)CoxMy]O2(M=Al、Mn)正极材料,X射线衍射光谱法(XRD)分析表明全部为标准的α-NaFeO2层状结构,Al和Mn完全进入晶格中。扫描电子显微镜法(SEM)观察二次颗粒形状为球形。差示扫描量热法(DSC)分析表明掺杂后材料的热稳定性有了一定的提高。在电压范围为3.0～4.3V,电流密度为5mA/g的条件下,LiNi0.8Co0.2O2、LiNi0.8Co0.15Al0.05O2和LiNi0.8Co0.15Mn0.05O2的首次放电比容量分别为190、187、184mAh/g,60次循环后容量保持率分别为91.3%、93.8%和92.3%,循环性能有了很大的提高。综合各项性能,认为掺Al比掺Mn材料性能要好。Li[Ni（1-x-y）CoxMy]O2（M=Al、Mn） as cathode materials for lithium ion batteries were prepared by co-precipitation. X-ray diffraction（XRD） patterns show that both compounds have standard α-NaFeO2 layer structure. AI and Mn were substituted for Co completely. The SEM images show that the spherical morphology of second particles is maintained. Thermal stability is improved by DSC analysis. The initial discharge capacities of LiNio.8Co0.2O2, LiNi0.8Co0.15Al0.05O2 and LiNi0.8Co0.15Al0.05O2 were 190,187 mAh/g and 184 mAh/g, respectively, in the voltage range of 3.0-4.3 V at a constant current density of 5 mA/g. The capacity retention after 60 cycles was 91.3%,93.8% and 92.3%, respectively. The cycling performance was enhanced greatly. Based on the preliminary results, it can be concluded that characteristic of Al doping is better than that of Mn doping.

关 键 词：锂离子蓄电池 正极材料 Li[Ni(1-x-y)CoxMy]O2(M=Al、Mn) 掺杂 

分 类 号：TM912.9[电气工程—电力电子与电力传动]