Co-doped lithium iron phosphate positive electrode material and preparation method and application thereof

• Main Authors: YAN MING, YU MINGMING, DOU JUN, WU PENGSEN, GE JIAJIA, YIN SHENGYU, YANG YI, HUO QIANQIAN, CHENG DANHUI
• Format: Patent
• Language: Chinese; English
• Published: 25.08.2023
• 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 co-doped lithium iron phosphate positive electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium ion batteries. Specifically, the preparation method comprises the following steps: fully mixing an iron source, a phosphorus source, a lithium source, a vanadium source, a carbon source, an additive, a surfactant and a solvent, and obtaining the co-doped lithium iron phosphate positive electrode material through a solid phase method, wherein the iron source comprises first iron phosphate and second iron phosphate; the specific surface area of the first iron phosphate is 9.1 m < 2 >/g to 27 m < 2 >/g, and the specific surface area of the second iron phosphate is 4 m < 2 >/g to 9 m < 2 >/g. The process is simple and easy to implement, is suitable for batch production, can be used for obtaining the lithium iron phosphate positive electrode material with high specific capacity, high structural stability, low polarizability, high