Method for recovering cobalt from lithium battery anode material

Abstract

The invention discloses a method for recovering cobalt from a lithium battery anode material. The method is characterized by comprising the following steps of: (1) removing aluminum foil from the anode material, obtaining a black solid matter containing lithium cobalt oxide, roasting the black solid matter to form lithium cobalt oxide powder, (2) weighing and adding the lithium cobalt oxide powder into 119-240g / L of citric acid according to a solid-to-liquid ratio of (20-30):1g / L, adding hydrogen peroxide at a mass fraction of 30% according to a mole ratio of 2:(1-1.05), performing stirring leaching for 5-7h at 80-90 DEG C, filtering to form filtrate containing the cobalt, (3) adding an ammonium oxalate solution into the filtrate to form a cobalt oxalate precipitate, and (4) after drying the cobalt oxalate precipitate, adding lithium carbonate powder according to a mole ratio (1:(1-1.05)) of the cobalt to lithium, grinding uniformly, roasting for 6-8h at 800-850 DEG C, and obtaining lithium cobalt oxide powder capable of directly serving as the electrode material. The method is easy to operate and high in recovery rate, equipment is simple, waste liquid is easy to treat, and the pollution of waste lithium batteries to an environment can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of recycling waste power batteries, and more specifically relates to a method for recycling cobalt from lithium battery cathode materials. Background technique [0002] Lithium batteries have the characteristics of high energy density, light weight, small size, long cycle life and no memory. They are widely used in portable electronic devices such as mobile phones, laptops and cameras, as well as in automotive, aerospace and medical equipment. After hundreds of times of charging and discharging of lithium batteries, the electrode materials will expand and shrink, and the performance of active materials will also change, which will lead to a decrease in battery capacity and even battery scrapping. [0003] As lithium batteries are more and more widely used, more and more scrap lithium batteries are produced. Although compared with primary batteries, lithium-ion batteries have relatively little impact on the e...

AI Technical Summary

Problems solved by technology

The former has high energy consumption, produces dioxin, dust and heavy metal pollution during the incineration process, and has high requirements for incineration equipment; the strong acid and strong alkali waste liquid produced by the latter has high requirements for equipment, and the waste liquid is not easy to handle and easily produces secondary pollutants. Secondary pollution, not suitable for industrial recycling

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