微波合成LiCoO2及其结构表征

以Co2O3和LiOH·H2O为原料,微波加热合成锂离子电池正极材料LiCoO2·考察了微波输出功率、微波加热时间及保温时间对产物结构和组成的影响,用XRD实验对所得产品进行表征·结果表明,当微波输入功率为360W,加热时间为10min,保温时间为10min时,产品是单一相层状结构LiCoO2,晶格常数和标准值一致·SEM实验显示,该反应条件下制备LiCoO2样品颗粒边缘清晰、光滑,颗粒度约为5μm,粒度分布较均匀·对LiCoO2的微波合成机理进行了探讨,结合XRD实验,说明Co2O3和LiOH·H2O反应生成LiCoO2分两步完成·

Microwave Synthesis of LiCoO2 and Its Characterization

LiCoO2 powder as cathode material in lithium ion battery was synthesized by microwave heating using Co2O3 and LiOH·H2O as raw materials. The effects of microwave power output, heating time and holding time on the microstructure and composition of synthesized powder were investigated. XRD results show that the samples of single-phase layered LiCoO2 can be obtained with lattice constants confirming with reference values if the power output is 360 W and heating time and holding time are both 10 min. SEM images show that the LiCoO2 samples prepared under such conditions are featured with clear and smooth grain boundaries and evenly distributed grain size which is about 5 μm on an average. The microwave synthesis mechanism of LiCoO2 is discussed in combination with XRD results, indicating that the whole synthesis process is a two-step reaction. In addition, TGA-DTA tests were carried out for the raw materials.