紊流循环法合成超细磷酸锂及表征

Turbulent flow cycle synthesis and characterization of super-fine lithium phosphate

采用共沉淀法在紊流循环方式下制备超细磷酸锂的一种新工艺,探索了氢氧化锂和磷酸在紊流循环釜中制备超细磷酸锂的反应条件,用X射线粉末衍射、激光粒度仪、扫描电镜、比表面及孔隙分析仪及热分析仪对产物的晶体结构、粒度分布、外观形貌、比表面积以及热稳定性进行了表征。结果表明该方法制得的磷酸锂热稳定性好,粒度分布窄(D50=3.25?m),比表面积(BET)为13.38 m2·g?1,为一种分散均匀的超细粉体材料,可望成为一种高活性的锂离子电池正极材料原材料或电解质添加剂。

A new technology is proposed for the preparation of lithium phosphate by the co-precipitation method in a turbulent flow cycle equipment. The reaction conditions of lithium hydroxide and phosphoric acid in turbulent flow circulation kettle for the preparation of super-fine lithium phosphate were investigated. X-Ray powder diffraction （XRD）, laser granularity instrument, scanning electron microscopy （SEM）, specific surface and porosity analyzer and thermal analyzer were used to characterize the crystal structure, particle size distribution, morphology, specific surface area and thermal stability of the products. The lithium phosphate prepared by this method had good thermal stability, a narrow particle size distribution ofD50=3.25 ktm, and a specific BET surface of 13.38 mE ~ g-1. As a uniformly dispersed super-fine powder material, the lithium phosphate is expected to be a highly active raw material of cathode materials for lithium ion battery or an additive for lithium ion battery electrolyte.