Lithium iron phosphate positive electrode material and preparation method and application thereof

The invention discloses a lithium iron phosphate positive electrode material and a preparation method and application thereof, the lithium iron phosphate positive electrode material is a lithium-grafted polyacrylic acid coated and modified lithium iron phosphate positive electrode material, and the...

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Hauptverfasser: YE JIAN, CHANG ZHANPENG, WANG XIAOJING, LIU LONG, WANG WANSHENG
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention discloses a lithium iron phosphate positive electrode material and a preparation method and application thereof, the lithium iron phosphate positive electrode material is a lithium-grafted polyacrylic acid coated and modified lithium iron phosphate positive electrode material, and the chemical formula is LiFePO4/PAA-Li; the preparation method comprises the following steps: (1) weighing an acrylic monomer and dissolving the acrylic monomer in water to form an acrylic acid solution; (2) adding an iron source and a phosphorus source into an acrylic acid solution, then adding an initiator, stirring at a constant temperature to dissolve the initiator, and regulating the pH value of the system by using ammonia water to obtain a turbid liquid; and (3) adding a lithium source into the turbid liquid, carrying out constant-temperature hydrothermal reaction at the temperature of 80-250 DEG C, and carrying out post-treatment on the reaction liquid to obtain the lithium-grafted polyacrylic acid coated and mo