A sintering process for the preparation of positive electrode materials for lithium-ion batteries

Abstract

The invention discloses a sintering process for the preparation of positive electrode materials of lithium-ion batteries. In the process, firstly, whole batches of uniformly mixed materials to be reacted are loaded into a reaction chamber, and at the same time, high-temperature clean hot air for material reaction and fluidization is prepared. source. Then the hot air is passed into the reaction chamber to start heating and fluidizing the materials to be reacted. The whole process is divided into four steps of heating, fluidization and sintering, and the fine powder is separated and collected in the high-speed fluidization stage. In the fourth stage, samples are taken to monitor the particle size distribution of the material. The material whose particle size meets the requirements is discharged for standby, and the unqualified ones continue to be fluidized and crushed until the particle size meets the requirements. The advantages of the present invention are: (1) The dynamic sintering method is adopted, the material is evenly heated, and the reaction is uniform and the reaction speed is fast. (2) Hot air is used to supply high-temperature heat source, which has high energy utilization rate and low energy consumption. (3) The air source is used to fluidize the granular material, and the fine grinding of the material can be realized while reacting, and the precise control of the particle size of the product can be realized without matching the jaw crusher for fine grinding with double rollers.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material for a lithium ion battery, in particular to a sintering process for the preparation of a lithium ion positive electrode material. Background technique [0002] At present, the mainstream large-scale preparation method of lithium-ion battery cathode materials (lithium cobaltate, ternary materials, lithium manganese oxide, lithium iron phosphate, etc.) kiln and roller kiln) and crushing equipment (jaw breaker, double roller, jet mill, etc.), the main process is that the material is loaded in the casket pot, pushed to the tunnel kiln for sintering, and the sintered block is passed through the jaw crusher , rollers, fine grinding (jet mill, mechanical mill, etc.) three-stage crushing to produce sintered products. Using this equipment and process to prepare materials, the sintering temperature curve is smooth, the internal temperature distribution is uniform, the product batch q...

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Problems solved by technology

However, this process also has disadvantages, mainly including: ①The heating method of the kiln is electric heating, the energy conversion utilization rate is low, and the energy consumption is large

② The kiln is an open structure with serious thermal pollution

③ Cassette-type filling materials, leakage is more serious, and the life of the casket is short, so it needs to be replaced regularly

④The length of the kiln is generally not more than 50 meters, which limits the amount of material fed to the kiln, resulting in slow sintering speed and high energy consumption

⑤ Long-distance material transportation under high temperature, prone to abnormalities of material stuck in the furnace

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