Recycling and regenerating method of waste lithium cobalt oxide positive electrode material

Abstract

The invention discloses a method for recycling and regenerating a waste lithium cobalt oxide positive electrode material, which comprises the following steps: placing a waste lithium cobalt oxide battery positive electrode plate in ethylene glycol, carrying out ultrasonic leaching in an oxygen atmosphere, screening with a 300-mesh screen after the ultrasonic leaching is finished, carrying out vacuum drying on screen underflow to obtain waste lithium cobalt oxide positive electrode powder, placing lithium isopropoxide and the waste lithium cobalt oxide positive electrode in ethanol, and carrying out vacuum drying on the screen underflow to obtain the waste lithium cobalt oxide positive electrode material. The preparation method comprises the following steps: adding a lithium ion battery into a lithium ion battery, simultaneously adding tantalum pentoxide, ruthenium oxide, magnesium fluoride and TEMPO, stirring for 2-3 hours, carrying out microwave treatment on the system, naturally cooling, sequentially and repeatedly cleaning with acetone and ethanol for 3 times, and then cleaning with deionized water for 3 times to obtain the lithium-supplemented modified regenerated high-voltage positive electrode material. According to the invention, the preparation of the synergistically regenerated difunctional high-voltage anode lithium cobalt oxide material is realized, and the spatial layered structure of lithium cobalt oxide is directionally and controllably remodeled by virtue of different microwave absorbing properties of the added mixture, so that the lithium cobalt oxide occupies different positions of the layered structure; therefore, the lithium ion transmission rate is accelerated, and the high-voltage structural stability of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to a method for recycling and regenerating waste lithium cobalt oxide positive electrode materials, and belongs to the field of recycling and reusing of lithium ion battery materials. Background technique [0002] LiCoO 2 Due to its simple synthesis process, high initial coulombic efficiency, good cycle stability, stable charging and discharging voltage, high voltage platform and high volume energy density, it is widely used in the field of digital electronic products. However, LiCoO 2 Repeated charging and discharging during service will lead to the collapse of crystal structure, dissolution of metal elements and intensified side reactions, which will lead to the scrapping of batteries, which means that there are more waste LiCoO 2 produced by the battery. Waste LiCoO 2 Toxic metal elements and organic matter in batteries can pollute soil, air, and even groundwater, causing serious environmental problems and damage to human h...

AI Technical Summary

Problems solved by technology

Direct regeneration of LiCoO by high-temperature solid-phase synthesis 2 It is the most commonly used regeneration method at present. This method does not require acid leaching treatment, is simple to operate, and has low cost. However, the uneven lithium mixing step will lead to uneven final products, which have certain defects, and the sintering time is long. Regenerated LiCoO 2 The electrochemical performance needs to be improved

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