Double-coated positive electrode material and preparation method thereof

The preparation method comprises the following steps: heating and stirring a soluble ferrite solution, adding a phosphorus source, continuously heating and stirring, adding a lithium source, an additive and water, and carrying out ball milling, sanding and spraying to obtain a first mixed material;...

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Bibliographische Detailangaben
Hauptverfasser: WANG CAN, YE JIAN, CHANG ZHANPENG, DUAN TIANFANG, LIU LONG, PEI JIYAN
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The preparation method comprises the following steps: heating and stirring a soluble ferrite solution, adding a phosphorus source, continuously heating and stirring, adding a lithium source, an additive and water, and carrying out ball milling, sanding and spraying to obtain a first mixed material; calcining the first mixed material in an inert gas atmosphere, and crushing to obtain a first material; dispersing the first material in a citric acid solution, continuously stirring, then adding a soluble ferric salt solution and a lithium carbonate solution, continuously stirring, finally adding a carbon source, and sanding and spraying to obtain a second mixed material; and calcining the second mixed material to obtain the double-coated lithium iron phosphate composite material. The surface of the lithium iron phosphate is coated with lithium ferrite, and then carbon coating treatment is performed to form the double-coated lithium iron phosphate positive electrode material, so that the cycle performance, the pro