中文摘要：

采用共沉淀法合成球形前驱体Ni（0.8）Mn（0.2）（OH）2,混合LiOH·H2O通过高温烧结制备出锂离子电池镍基正极材料LiNi（0.8）Mn（0.2）O2。通过X射线衍射（XRD）、扫描电镜（SEM）、热重-差热分析（TG-DTA）以及恒电流充放电测试对材料进行表征,研究了烧结温度和烧结气氛对材料结构、形貌和电化学性能的影响。结果表明：800℃纯氧气氛（0.6L/min）下煅烧12h合成的材料晶型完整,是典型的六方晶系α-NaFeO2型结构;SEM测试显示材料平均粒径在10μm左右;电化学性能测试显示材料在25℃、2.75-4.20V、0.2C充放电条件下,首次放电比容量达173.6mAh/g,循环95次后,容量保持率达90.73%。

英文摘要：

Spherical LiNi（0.8）Mn（0.2）O2 powder was synthesized by sintering Li OH·H2O and the spherical Ni（0.8）Mn（0.2）O2 precursor prepared by co-precipitation method. The obtained powder was characterized by X-ray diffraction（XRD）,scanning electronic microscope（SEM）, thermal gravimetric-differential thermal analysis（TG-DTA） and constant current charge-discharge cycling test. The results show that the optimal preparation condition of the LiNi（0.8）Mn（0.2）O2 is800 ℃ under 0.6 L/min oxygen flowing. The XRD patterns of the materials prepared under the above condition can be identified by a typical structure of hexagonal α-NaFeO2 type. The SEM micrographs of LiNi（0.8）Mn（0.2）O2 show that the particle size is about 10 μm. The electrochemical measurements at 25 ℃ show that it delivers an initial discharge specific capacity of 173.6 mAh/g with the voltage range 2.75-4.2V at the 0.2 C rate and the capacity retention of 90.73% after 95 cycles.