(中国科学院 金属研究所
金属腐蚀与防护国家重点实验室, 沈阳 110016)
摘 要: 采用Pechini法在800℃空气中焙烧6h制备LiNixMn2-xO4试样(x = 0, 0.05, 0.1, 0.2, 0.3, 0.4,0.5)。 经XRD测试表明除LiNi0.5Mn1.5O4以外,其它的试样均为纯净的尖晶石结构。 尖晶石LiNixMn2-xO4试样电极在3.3~4.5V以及4.5~4.8V范围内的电化学性能测试表明:在3.3~4.5V范围内, 试样初始充放电容量随Ni元素掺杂比例的增加而降低;在4.5~4.8V范围内, 试样初始充放电容量随Ni元素掺杂比例的增加而增大;在3.3~4.8V范围内, 试样总的初始容量基本不变; 在3.3~4.5V范围内,试样的循环性能随Ni元素掺杂比例的增加而提高。
关键字: 尖晶石型LiNixMn2-xO4; 正极材料; 二次锂离子电池
(State Key Laboratory for Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences,Shenyang 110016, China)
Abstract:LiNixMn2-xO4(x=0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5)were prepared by Pechini method at 800℃ in air for 6h. All compounds show a single phase except for LiNi0.5Mn1.5O4 based on the XRD. The initial charge and discharge capacity of LiNixMn2-xO4 decrease with increase of substituted Ni content in 3.3~4.5V range; but increase with increase of substituted Ni content in 4.5~4.8V range. The total first charge and discharge capacity of LiNixMn2-xO4 are basically unchanged in 3.3~4.8V range. The cycle performance is enhanced with increase of substituted Ni content.
Key words: spinel LiNixMn2-xO4; cathode material; lithium-ion battery