source:other news
release time:2023-04-04
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1. Carbon thermal reduction method
The carbon heat reduction method is also one of the high -temperature solid phases. It is a relatively easy -to -industrial synthesis method. After mixing, bake it under the protection of high temperature and fish gas or nitrogen, and the carbon is restored to the binary iron, that is, the lithium iron phosphate is synthesized by the carbon heat reduction method.
Advantages: solve the oxidation reactions that may be triggered during the mixed processing process of raw materials, make the synthesis process more reasonable, and improve the conductivity of the material.
Disadvantages: The response time is relatively long, the temperature is difficult to control, and the control conditions of product consistency requirements are more harsh, and it is difficult to adapt to industrial production.
2. Water and heat synthesis method
Water thermal synthesis is the category of wet method. It is based on soluble sub -iron salt, lithium salt and phosphate. It directly synthesizes LIFEPO4 under water and heat. Due to the small solubility of oxygen in the water thermal system, the water thermal system lifpoa Synthetic provides an excellent inert environment.
Advantages: The water and heat method can prepare super fine particles in the liquid phase, and the raw materials can be mixed in the molecular grade. It has the advantages of uniform phase, small powder particle size, and simple operation, and has the advantages of easy mass production, good product batch stability, and low price of raw materials. At the same time, no inert atmosphere is required during the production process.
Disadvantages: The product structure prepared by the Water Cooked Synthetic Law often exists with iron dislocation, which generates a sub -stable FEPO, which affects the chemical and electrochemical properties of the product. At the same time, there are also uneven particle size, impure phases, large equipment investment (the design and manufacturing of high temperature resistance reactors is difficult and high, and the cost is high) or the shortcomings of the process.
3. In addition, the solution of the cohesion synthesis method, the hydraulic sedimentation method, and the microwave synthesis method are also applied to the preparation of LFP raw materials.
These processes have their own advantages and disadvantages, but after the improvement process, the most widely used in the first three types are the first three types. The A123 in the United States and Canada's Phostech use solid -phase method. Valence company in the United States uses carbon thermal reduction method. Use continuous water heating synthesis.
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