Overview of Preparation Process of Lithium Iron Phosphate Batteries for New Energy Vehicles

Abstract

Lithium iron phosphate batteries have become one of the most popular batteries in the new yuan automobile industry because of their stable operating voltage, good stability and long cycle life. Lithium iron phosphate batteries are generally composed of positive collector fluid, negative collector fluid, positive material, negative material, diaphragm, electrolyte and other parts. The preparation process of lithium iron phosphate batteries include co-precipitation method, precipitation method, hydrothermal method, sol-gel method, ultrasonic chemistry method and other preparation methods. This paper introduces the preparation mechanism, battery structure and material selection, production process and performance test of lithium phosphate batteries with iron-based compounds such as ferrous phosphate trihydrate as iron source, lithium hydroxide or lithium oxide as lithium source, and single carbon source such as glucose, acetylene black, graphene, carbon nanotubes, etc. At the same time, important processes such as the batching process, wet grinding process, spray granulation process, sintering process, crushing process and finished product post-processing process are introduced in detail. Among them, spray granulation, sintering and crushing are the most critical steps in LFP production, which directly determines the performance of the LFP products produced. Finally, we look forward to the development of lithium iron phosphate batteries and provide views on future new energy vehicle batteries.