Polyurethane-coated lithium iron phosphate composite material as well as preparation method and application thereof

• Main Authors: JIANG YONGSHAN, WANG JINMING, ZHANG YAN, HUANG BIYING, XU QIUFENG, CHU DONGXUE, WANG CHAOYING
• Format: Patent
• Language: Chinese; English
• Published: 24.10.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to the technical field of lithium battery materials, and discloses a polyurethane-coated lithium iron phosphate composite material and a preparation method and application thereof, the chemical general formula of the material is LiFe1-x-yTixMgyPO4/C, x is more than or equal to 0.01 and less than or equal to 0.05, y is more than or equal to 0.01 and less than or equal to 0.05, and x + y is more than or equal to 0.02 and less than or equal to 0.1. The preparation method comprises the following steps: step 1, carrying out hydrothermal reaction on NH4H2PO4, Fe (NO3) 3.9 H2O and a surfactant to obtain an iron phosphate precursor; step 2, mixing the iron phosphate precursor, a lithium source, a titanium source and a magnesium source to obtain LiFe < 1-x-y > Ti < x > MgyPO4; and step 3, mixing LiFe < 1-x-y > Ti < x > MgyPO4 and polyurethane or modified polyurethane, carrying out ball milling, and calcining to obtain the lithium iron phosphate composite material. According to the invention, the