摘要
以共沉淀法制备出的球形Ni0.5Co0.3Mn0.2(OH)2为前驱体,以碳酸锂为锂源,通过高温固相法合成了球形LiNi0.5Co0.3Mn0.2O2正极材料。通过热重分析(TGA/DSC)、X射线衍射(XRD)、扫描电子显微镜(SEM)、粒度分布、以及电化学性能的测试考查了不同烧结温度对LiNi0.5Co0.3Mn0.2O2的物理性能及电化学性能的影响。结果表明,900℃下烧结得到的LiNi0.5Co0.3Mn0.2O2晶体结构完整、球形形貌规则、粒度分布均匀,并表现出了优异的电化学性能,0.2 C首次放电容量达到了166.7 mA.h/g;1 C首次放电容量为151.6 mA.h/g,20次循环后,容量保持率高达97.9%。
Spherical LiNi0.5Co0.3Mn0.2O2 cathode material was synthesized by high temperature solid-state method using co- precipitated spherical Ni0.sCo0.3Mn0.2 （OH）2 and Li2CO3 as precursor and lithium respectively.Effect of different calcination temperatures on the physical and electrochemical properties of LiNi0.5Co0.3Mn0.2O2was studied by means of thermogravimetric analysis （TGA/DSC）, X-ray diffraction （XRD）, scanning electron microscope （SEM）, particle size analysis, and charge-discharge test.Results showed that the sample calcined at 900℃ presented the most complete crystal structure,the most perfect spherical shape, and the most homogeneous particle size distribution, and showed excellent electrochemical performance;the first discharge capacity reached 166.7 mA＇h/g at 0.2 C and 151.6 mA.h/g at 1 C,and the capacity retention was 97.9% after 20 cycles.
出处
《无机盐工业》
CAS
北大核心
2012年第5期28-31,共4页
Inorganic Chemicals Industry
