Lithium iron phosphate battery
The solid-phase method in lithium iron phosphate is mainly divided into high-temperature solid-phase method and carbon-thermal reduction method.
The high-temperature solid-phase method is a commonly used method for preparing lithium iron phosphate, the basic principle of which is to mix the iron source, lithium source and phosphorus source according to a certain ratio, and then heat treat it at high temperature to generate lithium iron phosphate through solid-phase reaction. The advantages of the high-temperature solid-phase method are that the process is simple, easy to industrialize, and at the same time, it is conducive to the full diffusion and migration of lithium ions and iron ions under high temperature conditions, so as to obtain excellent electrochemical performance. However, there are also some disadvantages of the high-temperature solid-phase method, such as high reaction temperature, high energy consumption, and uneven particle size distribution of the product, which will affect the quality and performance stability of the product.
The carbon-thermal reduction method is an economical preparation method, the basic principle of which is to add the carbon source as a reducing agent to the raw material mixing process, with ferric iron as the iron source, after the carbon source is calcined at high temperature, Fe3+ can be reduced to Fe2+, to avoid the conversion of Fe2+ into Fe3+ during the reaction, so there is no need for strict control to prevent Fe2+ from being oxidized. The advantages of the carbon-thermal reduction method are that it is less costly, easier to achieve large-scale industrial production, and at the same time, the electrochemical performance and cycle life of lithium iron phosphate can be improved due to the addition of carbon sources. However, there are also some disadvantages of the carbon thermal reduction method, such as the carbon generated during the reaction may affect the crystal structure and particle size distribution of lithium iron phosphate, thereby affecting the quality and stability of the product's performance.
In summary, the solid-phase method in lithium iron phosphate is mainly divided into high-temperature solid-phase method and carbon-thermal reduction method. Both methods have their own advantages and disadvantages, and the appropriate preparation method should be selected according to the actual production needs and conditions.