二水磷酸铁陈化过程对磷酸铁品质及形貌的影响研究  

Study on effect of aging process of ferric phosphate dihydrate on quality and morphology of ferric phosphate

作　　者：盛国臣 彭海南 李绍清 冷国琴 张雷 雷康 SHENG Guochen;PENG Hainan;LI Shaoqing;LENG Guoqin;ZHANG Lei;LEI Kang(Guizhou Phosphate New Energy Technology Co.,Ltd.,Guiyang 550300,China)

机构地区：[1]贵州磷化新能源科技有限责任公司,贵州贵阳550300

出　　处：《生态产业科学与磷氟工程》2024年第8期12-16,共5页Eco-industry Science & Phosphorus Fluorine Engineering

基　　金：贵州省科技计划项目(黔科合战略找矿[2022]ZD006)。

摘　　要：磷酸铁作为制备磷酸铁锂正极材料的重要前驱体,目前采用硫酸亚铁和磷酸通过均相沉淀法制备,反应后得到无定形磷酸铁,需要进行陈化转晶。陈化过程包含无定型磷酸铁溶解重排以及二水磷酸铁晶型的生长和凝聚,对磷酸铁的品质及形貌影响很大。研究结果表明,经过陈化转晶重排以后的磷酸铁为致密的类球状单斜FePO_(4)·2H_(2)O颗粒。在物料洗涤过程中控制物料与洗涤水质量比为1.0∶1.5、陈化温度70℃、陈化搅拌转速300~500 r/min、补加磷酸至pH 1.5条件下协同调控,可得到低杂质含量、高比表面积的多孔网状结晶体,从而提高下游磷酸铁锂的产品性能。As an important precursor for the preparation of lithium iron phosphate cathode materials,iron phosphate is currently prepared by homogeneous co-precipitation of ferrous sulfate and phosphoric acid.The amorphous iron phosphate after reaction needs to be aged,which includes dissolution and recrystallization and has great influence on the quality and morphology of iron phosphate.The results show that the aged iron phosphate is compact spheroidal monoclinic FePO_(4)·2H_(2)O particles.After aging at 70℃,whose stirring speed is between 300 and 500 r/min and added phosphoric acid to pH 1.5,then washing under 1.5 times water,porous iron phosphate with low impurity and high specific surface area can be obtained,which can serve as an excellent precursor for high-performance lithium iron phosphate.

关 键 词：磷酸铁 陈化转晶 品质 形貌 

分 类 号：TQ126.35[化学工程—无机化工]