LiFePO_4材料的溶胶凝胶法合成及其粒度研究

Particle Size Distribution and Synthesis of Lithium Iron Phosphate by Sol-Gel Method

采用溶胶凝胶法合成了橄榄石型LiFePO4材料。运用XRD、SEM和激光粒度分布仪等手段对材料进行表征。研究了反应体系pH值、煅烧温度、煅烧升温速率和柠檬酸用量等工艺参数对LiFePO4粒径和粒度分布、物相组成和结构等物性的影响。得到的适宜工艺条件为:反应体系pH值为3.57,煅烧温度800℃,煅烧升温速率7℃/min,柠檬酸用量3.5∶1.0。同时分析了各因素对LiFePO4材料粒度分布的影响机制,重点讨论了反应过程机理和煅烧过程机理。

Olivine-type lithium iron phosphate was synthesized by sol-gel method.The prepared LiFePO4 samples were characterized by XRD,SEM and laser particle size analyzer.The effect of the factors on particle size distribution,structure and morphology was investigated,and the suitable conditions were obtained as follow： pH of gelation preparation was 3.57,calcination temperature was 800 ℃,calcination heating rate was 7 ℃/min,the ratio of / was 3.5∶1.0.The influence mechanism of different factors on particle size distribution of lithium iron phosphate was analyzed.Reaction process mechanism and calcination process mechanism were mainly explored.