Positive waste slurry recovery system and recovery method for lithium-ion battery

Abstract

The invention discloses a positive waste slurry recovery system for a lithium-ion battery. The recovery system comprises an agitator, a filter funnel, a rotary arm dryer, a ball grinder, a fluidized bed, a packing absorbing tower and a screening machine, wherein the agitator, the filter funnel, the rotary arm dryer, the ball grinder and the fluidized bed are sequentially connected end to end; an exhaust port of the fluidized bed is connected to the packing absorbing tower; and the screening machine is located below a discharge hole of the fluidized bed. Moisture and a solvent dried by the rotary arm dryer are guided into the fluidized bed through an exhaust pipe and finally enter the packing absorbing tower together with a harmful gas in the fluidized bed, so that environmental pollution is avoided. By the recovery system disclosed by the invention, continuous and efficient recovery of the positive waste slurry in production of the lithium-ion battery is achieved; the purity of the recovered material can be ensured; and the recovery system is high in efficiency and small in pollution, and still has good performance even if being used for a long period of time, so that the production cost is greatly reduced; and the competitiveness of a battery manufacturing enterprise is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a recycling system and method for the positive electrode waste slurry of lithium ion batteries. Background technique [0002] Lithium-ion batteries are widely used in mobile communications, notebook computers, electric bicycles, electric vehicles and other fields due to their advantages such as high energy density, light weight, long service life, low self-discharge rate and no memory effect. The main parts of lithium-ion batteries are the positive and negative electrodes. The positive electrode is usually made by uniformly mixing the positive electrode active material, conductive agent, and binder into a slurry, and then coating it on the aluminum foil of the current collector. The positive electrode active material is generally lithium. Compounds, such as lithium cobaltate, lithium manganate, lithium iron phosphate, etc., and the positive active material accounts ...

AI Technical Summary

Problems solved by technology

However, the waste slurry is exposed to the air for a long time, and it is easy to be mixed with impurities and foreign matter, and it will cause agglomeration after absorbing water. If it is directly used for coating, the rough and hard waste slurry particles will puncture the pole piece or Pierce the diaphragm when winding the battery core, causing a short circuit inside the battery, which greatly affects the quality of the battery

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