A method for recovering waste lithium ion batteries

Abstract

A method for recovering waste lithium ion batteries comprises the following steps: 1) discharging the waste lithium ion batteries and burying the waste lithium ion batteries in solid conductive powder; 2) pulverizing the waste lithium ion batteries, and then calcinating the pulverized waste lithium ion batteries at temperature of 400 DEG C- 600 DEG C without oxygen; 3) performing separation; 4) collecting powder sieved by a vibrating screen for standby use; 5) adding the powder of step 4) to excess NaOH; 6) adding the filter residue obtained in the step 5) into a mixed solution of sulfuric acid and H2O2, and filtering to obtain a solution; 7) adding excess sodium carbonate into the solution of the step 6), and washing and drying the precipitate obtained. The recovery method of the waste lithium ion batteries has high recovery efficiency; when discharging the waste lithium ion batteries, the method adopts the form of buried micro-discharge to be safe, high-efficient and pollution-free.

Description

technical field [0001] The invention relates to the recycling of precious metals, in particular to a method for recycling waste lithium ion batteries. Background technique [0002] With the increasing demand for energy and the continuous development of the electric vehicle market, lithium-ion batteries have been favored by people for their safety, environmental protection and high specific energy. In 2016, the national new energy vehicle subsidy policy further clarified the high energy density requirements for the development of power batteries. Among the cathode materials of lithium-ion batteries, nickel-cobalt-manganese (NCM) ternary materials have higher specific capacity and become the lithium battery for new energy vehicles. The mainstream direction of ion power battery development. [0003] The continued normal production and sales of new energy vehicles has made the recycling of power batteries more and more prominent. The national and local governments have successi...

AI Technical Summary

Problems solved by technology

[0005] 1) The recovery process is extensive, and the comprehensive recovery efficiency for valuable metals is low;

[0006] 2) The discharge of pollutants is large and the treatment effect is poor during the recycling process;

[0007] 3) Recycled products are single and have low added value;

[0008] 4) The recycling network is mainly composed of small and medium-sized companies, and the technological level is not perfect, so it is difficult to effectively recycle;