摘要
本文采用共沉淀法制备球形Ni0.80Co0.15Al0.05(OH)2.05前驱体,经预氧化后,采用富锂配比在氧气和空气气氛下烧结合成LiNi0.80Co0.15Al0.05O2正极材料。用X射线衍射、扫描电镜和恒电流充放电测试等方法对该材料的结构、形貌及电化学性能进行表征。结果表明:当锂配比为1.15时,氧气和空气中烧结合成的LiNi0.80Co0.15Al0.05O2正极材料的形貌、结构和电化学性能相当。富锂配比方法可在空气气氛下制备出电化学性能优异的LiNi0.80Co0.15Al0.05O2正极材料。0.1 C放电克比容量在200 mA·h/g以上,首次效率在87%左右;1 C放电克比容量在168 mA·h/g以上;800周循环容量保持率在80%以上。
Spherical Ni0.80Co0.15Al0.05（OH）2.05 precursors were synthesized via precipitation method. The Ni0.80Co0.15Al0.05（OH）2.05 precursors were mixed with excess lithium sources. LiNi0.80Co0.15Al0.05O2 cathode materials were obtained after sintering the mixtures at O2 and air atmosphere, respectively. The structure and morphology of the materials were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）. The electrochemical performance of the cathode materials were analyzed by constant current charge-discharge test methods. When the molar ratio of Li ：（Ni＋Co＋Al） is 1.15, the structure, morphology and electrochemical performance of the LiNi0.80Co0.15 Al0.05O2 cathode sample obtained at air atmosphere are very similar with those of the sample made at O2 atmosphere. It was proved that LiNi0.80Co0.15Al0.05O2 cathode materials with excellent performance can also be synthesized even at air atmosphere with the help of excess Li. At rate of 0.1 C and 1 C, the cathode materials showed initial capacity of 200 mA·h/g and 168 mA·h/g, respectively, and retention of more than 80% after 800 cycles.
出处
《储能科学与技术》
CAS
2014年第6期620-623,共4页
Energy Storage Science and Technology
关键词
正极材料
镍钴铝酸锂
共沉淀法
富锂
cathode materials
LiNi0.80Co0.15Al0.05O2
coprecipitation method
Li-rich method
