Recycling method for lithium cobaltate positive electrode material of lithium ion battery

Abstract

The invention discloses a recycling method for a lithium cobaltate positive electrode material of a lithium ion battery. The recycling method comprises the following steps of: discharging a waste lithium cobaltate battery to obtain a positive electrode material of the battery; soaking and treating the positive electrode material in N-methyl pyrrolidone to obtain precipitates, and sintering the precipitates to obtain LiCoO2 powder; enabling the powder to react with a natural organic acid solution to obtain leach liquor containing Li<+> and Co<2+>; adding thiourea into the leach liquor to perform hydrothermal reaction; and performing centrifugal separation on products of the hydrothermal reaction and washing the precipitates, drying the products to obtain CoS crystals, collecting and filtering liquid supernatant to obtain filtrate, and adding saturated Na2CO3 into filtrate to react, thereby obtaining a Li2CO3 material. The recycling method disclosed by the invention can adopt relatively less chemical preparations, is simple in operation step, is high in recovery rate of lithium cobaltate, can realize electrochemical property cyclic regeneration of the waste battery positive electrode material, is obvious in effect, and is simple and easy to implement.

Description

technical field [0001] The invention belongs to the field of recycling methods and product utilization of waste lithium ion batteries, and in particular relates to a method for recycling lithium cobalt oxide cathode materials of lithium ion batteries. Background technique [0002] Since the commercialization of lithium-ion batteries in 1990, they have gradually replaced secondary batteries such as traditional nickel-metal hydride batteries and lead-acid batteries because of their advantages such as high energy density, high working voltage, good safety, long cycle life and small self-discharge. Batteries are widely used in mobile communications, instruments and computers, and become the main force in the secondary battery market. At the same time, with the development of new energy strategies in various countries in recent years, the development of electric vehicles, especially hybrid vehicles, is particularly rapid, and the market share of lithium-ion batteries in the power...

AI Technical Summary

Problems solved by technology

But LiCoO 2 There are also many defects, such as high cost, limited cobalt resources and high toxicity, so the recovery of invalid LiCoO 2 Electrodes can both regenerate cobalt resources and alleviate environmental pollution

[0004] In the recovery of lithium cobaltate materials, there are currently two main approaches: (1) leaching lithium cobaltate materials, and then gradually recovering and separating metals, such as the method for separating and recovering cobalt from waste lithium-ion batteries disclosed in patent 200510018601.6 And 201510108230.4 discloses a method for recovering lithium from waste lithium-ion batteries; and generates Co(OH) by chemical precipitation 2 、CoC 2 o 4 , and LiCO 3 etc. The product recycling process is a bit cumbersome, consumes more resources and chemical reagents, and the recovery rate is low

(2) After the lithium cobaltate material is leached, add lithium salt or cobalt salt to adjust the stoichiometric ratio, then heat the solution in a water bath and add ammonia water dropwise to prepare xerogel; finally perform secondary calcination to obtain lithium cobaltate material, such as patent 200910093727.8 A disclosed method for preparing lithium cobaltate by recycling waste lithium-ion batteries; this type of method is complex in process, and the electrochemical performance is difficult to reach the quality of commercial lithium cobaltate materials

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