Lithium battery positive electrode material recovery method

Abstract

The invention discloses a lithium battery positive electrode material recovery method. The method comprises the following steps: soaking in an alkaline solution, namely soaking a positive electrode plate of a waste lithium battery positive electrode material in a container filled with the alkaline solution; hydrolyzing, namely placing mixed liquid of an aluminum hydroxide solution obtained in former step and lithium cobalt oxide powder in pure water, hydrolyzing and then performing water screening and washing; carrying out hydrogen treatment, namely placing the lithium cobalt oxide powder treated through step a and b in an atmosphere furnace, then inflating the hydrogen in the furnace, heating at high temperature; hydrolyzing to remove lithium, namely placing the hydrogenated lithium cobalt oxide in the pure water to hydrolyze; carrying out solid-liquid separation, namely performing solid-liquid separation on the hydrogenated lithium cobalt oxide, and washing the separated solid for three times, drying, grinding to obtain cobalt oxide. The cobalt oxide as the positive electrode material is recovered by using the method of soaking in the alkaline solution, hydrolyzing, hydrogen treating, hydrolysis for lithium removal and solid-liquid separation; the recovery cost is low, the recovered cobalt oxide has few impurities, and is high in purity and good in effect.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for recycling positive electrode materials of lithium batteries. Background technique [0002] Lithium-ion batteries have been widely used as power sources for various mobile devices since their commercialization due to their high energy density, high operating voltage, no memory effect, and long cycle life. [0003] The structure of the lithium-ion battery is composed of the main parts such as the positive electrode and the negative electrode. The positive electrode is generally a positive electrode active material, acetylene black, and a binder that are evenly mixed and coated on the aluminum foil current collector. In the lithium-ion battery system, the cost of the positive electrode material accounts for about 30-40% of the total cost of the battery. Therefore, if it is necessary to recycle the positive electrode material of the lithium battery to save cost...

AI Technical Summary

Problems solved by technology

However, the recovery cost of this recovery method is high, the purity is not high enough, and the recovery effect is poor. Therefore, it is necessary to develop a recovery method for lithium battery cathode materials with low cost, good recovery effect and high cobalt purity.