Complete set of energy-saving roasting technology for regenerated lithium iron phosphate

Abstract

Belonging to the technical field of new energy, the invention discloses a complete set of energy-saving roasting technology for regenerated lithium iron phosphate. The complete set of energy-saving roasting technology for regenerated lithium iron phosphate includes the steps of: waste lithium battery disassembly, anode material ball milling, raw material powder mixing, mixture dehydration, roasting and melt impregnation, and drying grinding of premix: putting the obtained lithium iron phosphate premix into a mill and carrying out dry grinding for a certain period of time so as to obtain a lithium iron phosphate material. The technology provided by the invention can realize carbon coating of the lithium iron phosphate material with carbon-based glucose, improves the diffusion coefficient oflithium ions between two phases, increases the discharge capacity of the lithium iron phosphate anode material, and then improves the quality of the recycled lithium iron phosphate material, at the same time, protective gas involved in the roasting process is collected through a special structure of the material itself, so that the protective gas in the lithium iron phosphate roasting process canbe recycled, and the cost consumption of lithium iron phosphate regeneration and recycling can be 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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