A complete roasting process for energy-saving regenerated lithium iron phosphate

Abstract

The invention discloses a complete roasting process for energy-saving regenerated lithium iron phosphate, which belongs to the technical field of new energy. A complete roasting process for energy-saving regenerated lithium iron phosphate comprises the following steps: dismantling waste lithium batteries, ball milling positive electrode materials, Raw material powder mixing, mixing and dehydration, roasting and melt impregnation, dry grinding is expected, the obtained lithium iron phosphate is expected to be put into the mill, and dry grinding is carried out for a certain period of time to obtain lithium iron phosphate material, which can realize the utilization of carbon-based Glucose coats the lithium iron phosphate material with carbon, increases the diffusion coefficient of lithium ions between the two phases, increases the discharge capacity of the lithium iron phosphate cathode material, thereby improving the quality of the recovered lithium iron phosphate material, and at the same time through its own special The structure collects the protective gas during the roasting process, so that the protective gas during the roasting process of lithium iron phosphate can be recycled, and the cost consumption of regeneration and recovery of lithium iron phosphate is reduced.

Description

technical field [0001] The invention relates to the technical field of new energy, and more specifically, relates to a complete roasting process of energy-saving regenerated lithium iron phosphate. Background technique [0002] Lithium iron phosphate battery refers to a lithium ion battery that uses lithium iron phosphate as the positive electrode material. The positive electrode materials of lithium-ion batteries mainly include lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate, etc. Among them, lithium cobalt oxide is currently the positive electrode material used in most lithium-ion batteries. The cycle life of long-life lead-acid batteries is about 300 times, and the maximum is 500 times. The cycle life of lithium iron phosphate power batteries reaches more than 2,000 times. Standard charge (5 hour rate) use, can reach 2000 times. Lead-acid batteries of the same quality are "new for half a year, old for half a year, and m...

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Problems solved by technology

Solid-phase synthesis requires a higher temperature, and it needs to be reacted under the protection of Ar, N2 or other inert gases, and the synthesis cost is relatively high. The method of liquid-phase synthesis also needs to use calcination, and the synthesis cost is relatively high. Recycling of lithium battery cathode materials can reduce the raw material cost of lithium iron phosphate, but the roasting process in the preparation process needs to consume a large amount of fuel, which increases the regeneration cost of lithium iron phosphate, and the protective gas used in the combustion process, after the roasting is completed After being directly discharged, it also caused a lot of waste of protective gas. At the same time, due to the low ion electron conductivity of lithium iron phosphate itself, and the diffusion coefficient of lithium ions between the two phases is also low, resulting in the deintercalation of lithium ions in the material. The reversibility of the ferrous phosphate material is poor, which affects the quality of the recovered ferrous phosphate material

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