摘要
以二次干燥化学共沉淀法制得高密度前驱体Ni0.8Co0.2(OH)2,再与LiNO3混合经两个恒温阶段烧结(600℃恒温6h、800℃恒温24h)得到高密度LiNi0.8Co0.2O2。探讨了锂源、镍源、合成温度、合成时间等因素对产品的影响,从而优化了LiNi0.8Co0.2O2的合成工艺。所得非球形LiNi0.8Co0.2O2粉末振实密度高达3.24g/cm3,大幅度地提高正极材料的体积比能量。X射线衍射分析表明合成的LiNi0.8Co0.2O2具有规整的层状NaFeO2结构,预示着材料具有良好的电化学性能。
Precursor-Ni0.8Co0.2 (OH)2 with high tapping density was prepared by second stage drying method. High density LiNi0.8Co0.2O2 powders was synthesized by sintering the Ni0.8Co0.2(OH)2 and LiNOs at 600℃ for 6h and 800℃ for 24h. The influences of preparation conditions such as raw materials, the mole ratio of Li/(Ni +Co),the sintering temperature and the reaction time of the product were discussed. The synthetic technology was optimized. The tap density of the prepared non-spherical LiNi0.8Co0.2O2 powder reaches 3.24g/cm^3 and high tapping density leads to high volumetric specific capacity. XRD results show the material LiNi0.8 Co0.2O2 with order NaFeO2 layer structure. It promises the material has good electrochemical performance.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第6期945-946,951,共3页
Journal of Functional Materials
基金
国家自然科学基金资助项目(20671031)