Production method of anode material for lithium iron phosphate battery

The production method of lithium iron phosphate battery cathode material 1. Carbothermal reduction method The carbothermic reduction process is a high-temperature solid-phase method, which is relatively easy to industrialize a synthetic method, most of which are combined with lithium dihydrogen phosphate (LiHPO4), iron oxide (Fe2O3) or four Ferroferric oxide and sucrose are raw materials. After mixing, the fish is calcined under the protection of high temperature air or nitrogen, and the carbon ferric iron is reduced to divalent iron. It is synthesized by carbothermal reduction method of lithium iron phosphate. Advantages: It solves the oxidation reaction that may be caused during the mixing of raw materials, makes the synthesis process more reasonable, and improves the conductivity of the material. Disadvantages: The reaction time is relatively long, the temperature is difficult to control, and the control conditions that require strict product consistency are difficult to adapt to industrial production. 2. Hydrothermal synthesis The hydrothermal synthesis method is a wet method, which uses soluble iron salt, lithium salt and phosphoric acid as raw materials, and directly synthesizes LiFePO4 under hydrothermal conditions. Due to the low solubility of oxygen in the hydrothermal system, the synthetic hydrothermal system LiFePOA provides a good inert environment. Advantages: The hydrothermal method can prepare ultrafine particles in the liquid phase, and the raw materials can be mixed at the molecular level. It has the advantages of uniform phase, small particle size, simple operation, etc., and has the advantages of easy mass production, good batch stability, and cheap and easy-to-obtain raw materials. At the same time, no inert gas is required during the production process. Disadvantages: Iron dislocations often exist in the structure of the product prepared by the water-cooking method, which leads to metastable FePO, which affects the chemical and electrochemical properties of the product. At the same time, there are also shortcomings such as uneven particle size, impure phase, large equipment investment (high temperature and high pressure reactor design and manufacturing difficult, high cost), complex technology and other shortcomings. 3. In addition, sol-gel method, liquid phase co-precipitation method and microwave synthesis method are also used to prepare LFP raw materials. These processes have their own advantages and disadvantages, but at present, through improved processes, they are more widely used or three years ago, in the United States and Canada Phostech company solid phase method, the company's valence carbon thermal reduction method in the United States, and LG Chem use continuous water Thermal synthesis method. Conductive carbon coating is the key technology for preparing LiFePO2. A123 effectively reduces the internal resistance of the battery by applying a high-quality conductive carbon layer on the surface of the foil body in advance, and improves the large-scale discharge capacity of the lithium iron phosphate battery. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Analysis of thermal runaway of lithium ion battery