摘要
采用类溶胶 -凝胶法合成非化学计量尖晶石Li1 .0 5Co0 .0 5Ni0 .0 5Mn1 .9O3 .9F0 .1 前驱体 ,用三段热处理方式 ,即4 5 0℃预烧、6 5 0℃烧结、5 0 0℃回火制得尖晶石产物。用化学容量分析法测定Mn含量和平均价态 ,并通过粒度分布测定、扫描电镜 (SEM)观察、X射线衍射 (XRD)分析及电化学性能测试对产物进行表征。结果表明 :产物的Mn含量及平均价态与理论值吻合 ,产物平均粒径为 1 .80 0 μm ,粒径分布窄 ,比表面积为 1 .0 9m2 /g ,晶形完整 ,晶格常数a缩小至 0 .81 5 0 6nm ,晶粒尺寸L减小至 5 4 .6 2 9nm。经装配电池测定电化学性能 ,产物容量高 (1 1 2 .5 9mAh/g) 。
The precursor of non-stoichiometric Li1.05CO0.05 Ni0.05Mn1.9O3.9F0.1 spinel was prepared by sol-gel-like method. The product was thermotreated in three-step, i.e. pre-annealing at 450°C, annealing at 650°C and backfiring at 500°C. The results, characterized by volumetric analysis, granularity distribution, SEM, XRD and electrochemical performance test, show that the content of manganese and the average chemical valence fit well with theoretical value, the average diameter is 1.800 μm, specific area is 1.09 m2/g, and the powders has a narrow granularity distribution. The lattice constant of the spinel reduces to 0.81506 nm, crystal size is 54.629 nm, and crystallinity is better. The test battery has a higher specific capacity (112.59 mAh/g) and static cycle life in the electrochemical performance test.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2005年第2期63-66,共4页
Journal of Sichuan University (Engineering Science Edition)
基金
四川省应用基础基金资助项目(02GY029-031)
关键词
正极材料
尖晶石
类溶胶-凝胶法
Annealing
Cathodes
Characterization
Electrochemistry
Lattice constants
Life cycle
Sol
gels
Stoichiometry
Synthesis (chemical)
