Drying method for lithium iron phosphate precursor slurry

Abstract

The invention discloses a drying method for a lithium iron phosphate precursor slurry. The method is characterized by dividing a traditional drying process into four processes, wherein the steps the processes: 1, subjecting ground and mixed precursor slurry to settling and layering by standing and other means, and eliminating layered supernatant liquid; and 2, uniformly mixing the rest of the slurry under stirring, and carrying out drying by using a common drying device. The method provided by the invention does not require complicated equipment and process flow and has small investment; meanwhile, in the continuous operation of industrial production, the method can greatly decrease required time and energy consumption of drying, thereby improving production efficiency and reducing production cost.

Description

technical field [0001] The invention relates to the technical field of material drying, in particular to a drying method of lithium iron phosphate precursor slurry. Background technique [0002] Lithium iron phosphate material is one of the most promising cathode materials in the current lithium-ion secondary battery field. According to the current development of the power battery and energy storage battery market, it is expected that the demand for lithium iron phosphate material will also show a blowout growth. At present, the industrial preparation of lithium iron phosphate is mainly based on the solid phase method, which has different preparation processes according to different processes, and some processes require secondary wet grinding and mixing of pre-fired materials. The more commonly used ones are ferrous oxalate process, ferric phosphate process, iron red process, etc. Mixed solvents are mostly water or organic solvents such as ethanol, methanol, and acetone. I...

AI Technical Summary

Problems solved by technology

Among them, the spray drying equipment cannot dry the slurry with too high solid content, high energy consumption, expensive equipment, small processing capacity, high equipment maintenance cost, and does not meet the requirements of green energy saving and low cost in industry.

The crawler drying equipment requires the higher the solid content, the better, but it is difficult to achieve a high solid content for the slurry produced in general industrialization, so it will also bring about the problem of high energy consumption, and the equipment is expensive

Compared with the traditional double cone drying and rake drying, the drying efficiency is low, the energy consumption is high, and the drying time is long, but the equipment is cheap

[0003] To sum up, under the existing drying technology, material production has become a shortcoming of the entire material production line due to the characteristics of long drying time and high energy consumption, which directly affects the production capacity of the entire production line and the cost of products