A kind of industrialized lithium iron phosphate manufacturing method and the lithium iron phosphate composite material thereof prepared

Abstract

The invention discloses an industrial lithium iron phosphate manufacturing method and a lithium iron phosphate composite material prepared thereby, the method comprises the following steps such as water solution preparing, ferrous phosphate preparing, iron phosphate preparing, lithium iron phosphate preparing and the like to obtain a lithium iron phosphate finished product, iron particles are intoa pre-prepared special mixed acid water solution to obtain a ferrous phosphate solution, and the ferrous phosphate solution is further subjected to oxidation, reaction, sintering and other steps to finally obtain the iron phosphate finished product; and the method is characterized in that in the reaction process, corresponding dispersing and nano particle control agents are added in the reactionprocess of each step, so that the morphology of each intermediate product is controlled, and the morphology and the performance of the final finished product are influenced. The lithium iron phosphatedisclosed by the invention has the advantages of high tap density, good filling property, high energy density per unit volume, low content of Fe < 3 + > phase, few impurities, improved charging and discharging cycle characteristics, environmentally-friendly process, no wastewater and waste gas, energy conservation and the like.

Description

technical field [0001] The invention belongs to the technical field of new energy battery materials, and in particular relates to an industrialized manufacturing method of lithium iron phosphate and the prepared lithium iron phosphate. Background technique [0002] Lithium iron phosphate electrode materials are mainly used in various lithium-ion batteries. AyMPO was first revealed by Japan's NTT in 1996 4 (A is an alkali metal, M is a combination of Co and Fe, for example: LiFeCoPO 4 ) Lithium battery anode material with olivine structure, in 1997, John.B.Goodenough and other research groups at Texas State University also reported LiFePO 4 The characteristics of reversibly moving in and out of lithium. The United States and Japan have simultaneously published the structure of olivine (LiMPO 4 ), making the material has received great attention, and caused extensive research and rapid development. Compared with traditional lithium-ion secondary battery cathode materials,...

AI Technical Summary

Problems solved by technology

However, lithium iron phosphate also has the following shortcomings: poor conductivity, low tap density, unstable performance, poor product consistency, and the preparation process is not environmentally friendly, easy to generate waste gas, requires a large amount of flushing water, and high energy consumption

Although at present, lithium iron phosphate has been in-depth research, and the performance has been greatly improved, but the nanometer control of lithium iron phosphate, electrical conductivity, tap density, grammage, and stability are still not very satisfactory. Therefore, the performance needs Further improve

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