Preparation method of lithium iron phosphate positive electrode material

• Main Authors: LIN YUANKAI, XIE HANWEI
• Format: Patent
• Language: Chinese; English
• Published: 29.03.2024
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a preparation method of a battery composite material, which comprises the following steps: (a) phosphoric acid, iron powder and a carbon source are provided, the phosphoric acid reacts with the iron powder to generate a first product, and the first product is amorphous iron phosphate with a chemical formula of alpha-FePO4.xH2O, xgt; 0; (b) providing a lithium salt mixture, wherein the lithium salt mixture comprises lithium hydroxide and lithium carbonate; (c) grinding and mixing the first product, a carbon source and a lithium salt mixture; (d) calcining the mixture of the first product and a lithium salt to generate a precursor, wherein the precursor has a chemical formula of Fe3 (PO4) 2.8 H2O + Li3PO4; and (d) calcining the precursor and the carbon source to generate the lithium iron phosphate positive electrode material. 本发明提供一种电池复合材料的制备方法，包括步骤：(a)提供磷酸、铁粉及碳源，其中磷酸与铁粉进行反应生成第一生成物，第一生成物为不定型磷酸铁，具有化学式α-FePO4·xH2O，x>0；(b)提供锂盐混合物，其中锂盐混合物包含一氢氧化锂与碳酸锂；(c)研磨混合第一生成物、碳源以及锂盐混合物；(d)煅烧第一生成物与锂盐混合物以生成前