Comprehensive recovery method for cathode materials of ternary lithium ion battery
A technology for lithium-ion batteries and positive electrode materials, applied in the field of comprehensive recovery of positive electrode materials for ternary lithium-ion batteries, can solve the problems of low Li recovery rate and achieve the effect of improving recovery rate
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[0024] Example 1
[0025] A comprehensive recovery method of ternary lithium ion battery cathode material includes the following steps:
[0026] S1. Add ternary lithium ion battery positive electrode powder to water for beating treatment to obtain a beating liquid. The mass ratio of solid to liquid in the beating liquid is 1:6, then add concentrated sulfuric acid and hydrogen peroxide and stir for 1.5h, stirring temperature is 70℃, concentrated sulfuric acid The volume-to-volume ratio (mol / L) to the beating solution is 2:1, and the volume-to-mass ratio (mL / g) of hydrogen peroxide to the positive electrode powder of the ternary lithium ion battery is 2:1, and the acid leaching solution A is obtained by filtration;
[0027] S2. Adjust the acid leaching solution A to be acidic, add excess Fe powder to remove Cu impurities, and then remove the iron-aluminum impurities in the solution by using alumite method, and filter to obtain filtrate B;
[0028] S3. Adjust the filtrate B to alkaline t...
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[0031] Example 2
[0032] A comprehensive recovery method of ternary lithium ion battery cathode material includes the following steps:
[0033] S1. Add ternary lithium ion battery cathode powder to water for beating treatment to obtain a beating liquid. The mass ratio of solid to liquid in the beating liquid is 1:8. Then, add concentrated sulfuric acid and hydrogen peroxide and stir for 2.5 hours. The stirring temperature is 80°C and concentrated sulfuric acid. The volume-to-volume ratio (mol / L) to the beating solution is 4:1, the volume-to-mass ratio (mL / g) of hydrogen peroxide to the ternary lithium-ion battery cathode powder is 3:1, and the acid leaching solution A is obtained by filtration;
[0034] S2. Adjust the acid leaching solution A to be acidic, add excess Fe powder to remove Cu impurities, and then remove the iron-aluminum impurities in the solution by using alumite method, and filter to obtain filtrate B;
[0035] S3. Adjust the filtrate B to alkaline to precipitate nick...
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[0038] Example 3
[0039] A comprehensive recovery method of ternary lithium ion battery cathode material includes the following steps:
[0040] S1. Add 1kg of ternary lithium ion battery cathode powder to 4L of deionized water for beating to obtain a beating solution, then add 20mol of concentrated sulfuric acid and 1L of hydrogen peroxide and stir for 3h at a stirring temperature of 60°C, and filter to obtain acid leaching solution A;
[0041] S2, adjust the pH value of acid leaching solution A to 2, add excess Fe powder to remove Cu impurities, then add excess sodium chlorate and sodium carbonate, adjust the pH to 2.5 to remove iron and aluminum impurities in the solution, and filter to obtain filtration Liquid B;
[0042] S3. Add NaOH solid to the filtrate B, adjust the pH of the filtrate B to 10 to precipitate nickel, cobalt, and manganese, and filter to obtain solution C and filter residue D;
[0043] S4. Concentrate solution C to a lithium element concentration of 10g / L, and the...
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