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600℃恒温6 h,800℃恒温24 h两个恒温阶段烧结,得到高密度LiNi0.8Co0.2O2,探讨了锂源、镍源、Li/(Ni+Co)摩尔比、合成温度等因素对产品的影响,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3.15 g/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,充放电测试表明,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 LiNi0.8 Co0.2 O2 powders was synthesized by sintering the Ni0.8Co0.2 （OH）2 and LiNO3 at 600℃ for 6 h and 800 ℃ for 24 h. The influence of preparation conditions such as raw materials, the mole ratio of Li/（Ni ＋ Co）and the sintering temperature of the product were discussed. The synthetic technology was optimized. The tap density of the prepared non-spherical LiNi0.8 Co0. 2 O2 powder reaches 3.15 g/cm^3 and high tapping density leads to high volumetric specific capacity. XRD results show the materials LiNi0.8 Co0. 2O2 with order NaFeO2 layer structure. Electrochemical property tests testified that material has good electrochemical performance.
出处
《应用化工》
CAS
CSCD
2007年第3期214-216,共3页
Applied Chemical Industry
基金
国家自然科学基金资助(20671031)
