Electroplating peeling recovery technology of lithium battery electrode

Abstract

The invention discloses an electroplating peeling recovery technology of a lithium battery electrode. The electroplating peeling recovery technology comprises the following steps: disassembling and removing a positive plate and a negative plate; taking the positive plate or the negative plate tab as a cathode, taking the negative plate tab as an anode, introducing DC source, performing ultrasonic mixing, then performing electroplating; rotating the positive plate, electroplating the other anode coating surface by facing the anode; taking the positive plate or the negative plate out, filtering the positive plate or the negative plate by a screen mesh to obtain the active substance separating objects, performing deionization washing for 1-5 times, and drying the product and weighing the product. The electroplating peeling recovery technology has the advantages of cleaning and separating the electrode active material with high efficiency, uniformity of the metal ions deposited on the surface is good, bonding effect of an original binder and the surface can be rapidly destroyed, and a purpose of thoroughly disengaging and separating of the active material is reached. According to the invention, supersonic wave concussion with certain power is used, shedding of the active substance from a current collector is accelerated, the obtained anode / cathode active material and a solution are insoluble, and no solid impurity is introduced.

Description

technical field [0001] The invention belongs to the field of lithium ion battery material recovery, in particular to an electroplating stripping recovery method for lithium battery electrodes. Background technique [0002] With the large-scale use of power batteries in electric vehicles, the scrapping and recycling of batteries is an important issue. Electrolyte and active materials contained in scrap lithium-ion batteries will directly pollute land and water sources; separators, battery shells and battery current collectors are not easily corroded, resulting in a large amount of solid waste pollution. The positive and negative active materials in lithium-ion batteries have the value of repeated use, especially as the development of lithium batteries has pushed up the market price of lithium salts. If the positive electrode materials of scrap batteries can be effectively recovered and reused, it will save enterprises A lot of cost. How to efficiently and cleanly recycle va...

AI Technical Summary

Problems solved by technology

Among the currently recovered patents, methods such as "acid leaching", "high temperature treatment" and "mechanical crushing" are mostly used in this link, and these methods have problems such as pollution, long cycle, and incomplete separation of active substances and current collectors.

[0004] The positive electrode of lithium batteries mainly uses aluminum foil as the current collector, while the negative electrode uses copper foil as the current collector. Both have excellent electrical conductivity, but the positive and negative active materials coated on the surface often have poor conductivity, especially the positive electrode materials, such as LiCoO 2 and LiFePO 4 The conductivity is 10 -3 S cm -1 and 10 -9 S cm -1

Carbon black, carbon nanotubes, etc. need to be added between the active materials to improve conductivity, but the addition of these conductive agents is limited, and the contact surface with the current collector has contact resistance

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