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磷酸铁是锂电池正极材料磷酸铁锂的核心前驱体，磷酸铁的形貌及硫含量对合成的磷酸铁锂性能有重要影响。为得到颗粒尺寸合适以及低硫含量的磷酸铁产品，对液相沉淀法进行优化：一是将磷酸和氨水单独加料方式更改为将磷酸与氨水混合后形成磷酸一铵再加入，有效降低了磷酸铁的硫含量；二是在陈化时采用阶段式升温的方式并在不同阶段加入氨水和磷酸，改变了磷酸铁的结晶度和形貌。采用此方法制备的磷酸铁产品硫的质量分数低至4.2×10-5，为块状片状混合颗粒，用其制备的磷酸铁锂压实密度达到2.53 g/cm3。
Abstract：Iron phosphate(FePO4) is a key precursor for cathode material of lithium battery lithium iron phosphate(LiFePO4).The morphology and sulfur content of FePO4significantly impact the performance of the synthesized LiFePO4.To achieve FePO4products with suitable particle size and low sulfur content,the liquid phase precipitation method is improved and optimized.Instead of adding phosphoric acid and ammonia water solely,ammonia water is mixed with phosphoric acid to form monoammonium phosphate,which is then added to FeSO4solution,this effectively reduced the sulfur content.During the aging process,the crystallinity and morphology of FePO4are changed by staged heating and adding ammonia water and phosphoric acid at differen stages.The FePO4products prepared under this method have a low sulfur mass fraction of 4.2×10-5,a morphology of block-like flake mixed particles,and the compaction density of LiFePO4produced by this FePO4is 2.53 g/cm3.
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基本信息:
DOI：
中图分类号:TM912
引用信息:
[1]吴松,王海涛,黎金澄.电池级无水磷酸铁制备方法研究[J].生态产业科学与磷氟工程,2024,39(09):17-21.
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