MgO和ZrO2包覆对正极材料结构和电性能的影响
王军 张宇
(内蒙古科技大学材料与冶金学院，内蒙古包头 014010)
关键词：锂离子电池；正极材料；包覆；电化学性能
摘要：通过共沉淀法制备了前驱体Ni1/3Co1/3-xMn1/3(OH)2，然后与LiOH·H2O、不同金属氧化物（MgO、ZrO2）分别混合制备了锂离子电池正极材料LiNi1/3Co1/3-xMn1/3MxO2 (M=Mg, Zr)。通过X射线衍射(XRD)、扫描电镜（SEM）、高精度电池测试系统、交流阻抗对材料的结构和电化学性能进行了表征.实验结果表明，包覆MgO后，材料的结构发生了变化，而包覆ZrO2没有改变正极材料的结构.与无包覆的正极材料相比较，包覆ZrO2材料的首次放电量为119.07mAhg-1，20次循环后容量保持率为92.64%，放电量仍达到110.31 mAhg-1。
Influence of the coated MgO and ZrO2 on the structure and electrochemical performance of cathode material
Wang Jun ,Zhang Yu
(College of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China)
Key words:lithium ion battery, cathode material, coated, electrochemical
Abstract:The precursors Ni1/3Co1/3-xMn1/3(OH)2 were prepared by co-precipitation , and mixed with LiOH·H2O and different metal oxides (MgO, ZrO2) to obtain lithium ion battery cathode material LiNi1/3Co1/3-xMn1/3MxO2 (M=Mg, Zr),whose structure and electrochemistry properties were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM), high performance battery testing system, and AC impedance. The experimental results showed that the structure of the material changed after being coated with MgO, but did not change after being coated with ZrO2. Compared with the none coated material, the initial discharge magnitude of the material coated with ZrO2 was 119.07 mAhg-1; after 20 cycling, its discharge quantity was still able to achieve 110.31 mAhg-1 ,and the capacity retention ratio was 92.64%.