【作者】 朱先军； 刘韩星； 胡晨； 甘小燕； 周健； 欧阳世翕；

【Author】 Zhu Xianjun, Liu Hanxing, Hu Chen, Gang Xiaoyan, Zhou Jian, Ouyang Shixi (State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University ofTechnology, Wuhan, Hubei 430070, China)

【机构】 武汉理工大学材料复合新技术国家重点实验室；

【摘要】 本文以LiOH·H2O、Ni2O3、Co2O3和Al(OH)3为原料,采用固相反应法合成Co-Al共掺杂的LiNiO2化合物LiNi0.08Co0.02-xAlxO2,并进一步用TG-DTA、XRD、SEM和电化学测试等实验手段对材料的结构与电化学特性进行表征。结果表明Co-Al共掺杂能改善该材料的综合性能;掺杂量x=0.05时,LiNi0.80Co0.15Al0.05O2的首次放电容量达178.2mAh/g,20次循环之后容量还保持168.2 mAh/g,容量保持率为94.4%;而相同情况下的LiNiO2首次放电容量为180.7 mAh/g,20次循环之后容量只有147.6 mAh/g,容量保持率仅有81.7%。与未掺杂的LiNiO2相比,该材料显示出良好的循环性能,是一种很有应用前景的锂离子电池正极材料。更多还原

【Abstract】 In the present study, samples of LiNi0.80Co0.20-xAlxO2 (x=0.015, 0.05 and 0.10), prepared by solid state reaction from LiOH·H2O, Ni2O3 and A1(OH)3 under oxygen flow. The microstructures and electrochemical properties of the reaction products were characterized by TG-DTA, XRD and electrochemical tests equipment. LiNiO2 simultaneously doped by Co-Al was tried to improve the performance of cathode materials. The results showed that co-doping definitely has a large beneficial effect on cathode materials’ characterization. LiNi0.80Co0.15Al0.05O2 whose Al dopant is x=0.05 has 178.2 mAh/g of the first discharge capacity and 168.2 mAh/g of 20th discharge capacity as compared with 180.7 mAh/g and 147.6 mAh/g for LiNiO2, respectively. It is a promising cathode material for lithium-ion batteries.更多还原