黄映恒, 童张法, 蓝建京, 陈义族. 前驱体固相反应法制备含锂磷酸盐LiCoPO4过程研究[J]. 云南大学学报(自然科学版), 2010, 32(3): 314-319 .
引用本文: 黄映恒, 童张法, 蓝建京, 陈义族. 前驱体固相反应法制备含锂磷酸盐LiCoPO4过程研究[J]. 云南大学学报(自然科学版), 2010, 32(3): 314-319 .
Studying the process of synthesis of LiCoPO4 nano-crystallites via solid state reaction of precursor[J]. Journal of Yunnan University: Natural Sciences Edition, 2010, 32(3): 314-319 .
Citation: Studying the process of synthesis of LiCoPO4 nano-crystallites via solid state reaction of precursor[J]. Journal of Yunnan University: Natural Sciences Edition, 2010, 32(3): 314-319 .

前驱体固相反应法制备含锂磷酸盐LiCoPO4过程研究

Studying the process of synthesis of LiCoPO4 nano-crystallites via solid state reaction of precursor

  • 摘要: 以氢氧化锂、磷酸二氢铵和醋酸钴为原料,加入少量水乙醇溶液,以聚乙二醇PEG-400为表面活性剂,在流变相状态下,经低热反应合成前驱体NH4CoPO4,再经固相反应活化制备LiCoPO4纳米晶体粉体,应用FTIR,XRD,TG-DTA,SEM表征分析,研究活化温度对LiCoPO4制备过程的影响.制备过程可描述为3个可阶段性控制的合成过程,在晶体生长过程中控制粒度,温度是关键因素,晶粒生长动力学指数为1.2,晶体生长激活能为E=18.54kJ/mol,晶粒的生长主要以界面扩散机理为主.

     

    Abstract: The nano-crystallites LiCoPO4 powder was got successfully after baking the precursor of the compound at high activation temperature.The precursor NH4CoPO4 was prepared with lithium hydroxide,monoammonium phosphate and cobalt acetate via solid state reaction at low temperature.The effects of activation temperature on the LiCoPO4 crystallization process was characterized by application of infrared spectroscopy,X-ray powder diffraction,TG-DTA thermal analysis,and SEM.The result shows that the synthesis of LiCoPO4 exist a variety of kinetic competition at high activation temperature,but the sintering process is the control procedure.The crystal growth kinetics index number is 1.2,the activation energy of nano-grain growth is 18.54 kJ/mol,the main process of grain growth is a interfacial diffusion.The study will providethe application of theoretical and experimental basis for electrochemical catalytic,magneto-electric materials,etc.

     

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