Method for preparing positive electrode material of lithium ion battery through fluidized sintering

Abstract

The invention provides a method for preparing a lithium ion battery positive electrode material through fluidized sintering. The method comprises the following steps: step 1, mixing materials; step 2, granulating; step 3, carrying out fluidized pre-sintering; step 4, performing high-temperature crystallization; step 5, crushing the materials; and step 6, demagnetizing and grading the materials. In the invention, a large amount of waste gas generated by the precursor and the lithium salt is discharged in time through fluidized pre-sintering, and meanwhile decomposition of the precursor, fusion of the lithium salt and a preliminary combination reaction of the precursor and the lithium salt are achieved; secondly, a fluxing agent which is easy to knot and generates alkali corrosion does not exist in the high-temperature crystallization kiln, so that the problem that the anode material of the lithium ion battery is knot in a dynamic kiln is solved; no decomposable gas product is formed in the high-temperature crystallization kiln, and the atmosphere in the kiln is stable and easy to control; meanwhile, the mass and heat transfer process is enhanced, the production energy consumption is obviously reduced, and the product consistency and the batch stability are obviously improved; therefore, the lithium ion battery positive electrode material is prepared by a large-scale, continuous and short-time sintering method.

Description

technical field [0001] The invention relates to the field of preparation of positive electrode materials for lithium ion batteries, in particular to a method for preparing positive electrode materials for lithium ion batteries by a fluidized sintering method. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and good safety performance. They have been widely used in 3C products, electric vehicles and other fields, and have become one of the most widely used and most promising batteries today. In 2018, the global lithium-ion battery production was 188.8GWh, and the industry scale reached 41.2 billion US dollars. In 2018, my country's lithium-ion battery shipments accounted for 57% of the world's total, surpassing South Korea and Japan to become the world's largest lithium-ion battery manufacturer. Among them, the positive electrode material accounts for 30% to 40% of the total cost of lithium-ion batteries, and d...

AI Technical Summary

Problems solved by technology

[0009] The invention provides a method for preparing lithium-ion battery anode materials by fluidized sintering, the purpose of which is to greatly improve the mass transfer effect of gas-solid reaction in the material preparation process, solve the problem of uneven temperature distribution in the kiln, difficulty in controlling the atmosphere and Solve the problem of furnace junction, realize low energy consumption, large-scale production of lithium-ion battery cathode materials with good consistency

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