December 20, 2025 Hunan News As one of the four core materials of lithium batteries, cathode materials are not only a key determinant of battery performance but also account for the main cost of batteries. Their technological iteration and process optimization directly affect the development pattern of the new energy industry. Among them, lithium iron phosphate (LFP) has become the mainstream product of current lithium battery cathode materials due to its significant advantages of low cost, high safety, and long cycle life, and is widely used in new energy vehicles, energy storage equipment and other fields. The production process of lithium iron phosphate is mainly divided into solid-phase method and liquid-phase method. Among them, the solid-phase method represented by the iron phosphate method has become the mainstream choice in the industry due to its simple process and strong practicality. The process consists of five core steps: mixing and grinding, spray drying, sintering, crushing and iron removal, and packaging. First, raw materials such as iron phosphate, lithium carbonate, and carbon source are mixed in proportion and ground to a fine particle size within 500nm by a sand mill; then the solvent is removed by a spray dryer to form dry powder; subsequently, it is sintered at a high temperature of 700-800℃ for 10-20 hours in a roller kiln under nitrogen protection to complete the key chemical reaction; finally, crushing and iron removal are performed to remove impurities, ensuring that the product purity and particle size meet the standards. It is worth noting that the carbon film formed by the carbon source during sintering can improve the conductivity of the material, and dispersants and additives further optimize the comprehensive performance of the product. At present, the iron phosphate process route still dominates the market, but emerging processes such as the ferrous oxalate method are gradually expanding their market share due to the higher compacted density of their products. Among the liquid-phase methods, the self-evaporating liquid-phase method represented by Defang Nano, although with high technical barriers, provides a differentiated development path for the industry. As the new energy industry's requirements for battery performance continue to improve, the production process of lithium iron phosphate will continue to upgrade towards high efficiency and refinement, injecting strong momentum into the global green energy transition. For more information, you can click: https://www.tiktok.com/@mia_iot