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Method for leaching positive electrode active material

A positive electrode active material and leaching technology, applied in the field of leaching of valuable metals, can solve problems such as deterioration, extraction solvent oxidation, etc., and achieve the effect of reducing usage

Active Publication Date: 2012-07-04
JX NIPPON MINING & METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, residual hydrogen peroxide may oxidize the extraction solvent and deteriorate it during solvent extraction.

Method used

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  • Method for leaching positive electrode active material
  • Method for leaching positive electrode active material
  • Method for leaching positive electrode active material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (Example 1: For the effect of adding hydrogen peroxide after leaching with sulfuric acid)

[0052] Such as figure 2 As shown in , positive electrode active material 1 (31.3 dry-g) was added to 0.5 L of 1 mol / L sulfuric acid solution (0.5 mol of sulfuric acid), and stirred at 600 rpm without heating. The amount of sulfuric acid to be added was the total amount of sulfuric acid having an equimolar amount to nickel, cobalt, and manganese in the positive electrode active material and sulfuric acid having a molar ratio of 0.5 to lithium. Table 1 shows the composition of the positive electrode active material added. The liquid temperature is 20-30°C. In addition, according to Table 2 showing the composition of the sulfuric acid leaching residue 2, by leaching using only sulfuric acid, 37 wt% of nickel, cobalt, and manganese contained in the positive electrode active material before leaching were leached, and 66 wt% of lithium was leached.

[0053] After the leaching using...

Embodiment 2

[0060] (Example 2: Manganese solvent extraction of leachate after addition of positive electrode active material and addition)

[0061] In 0.5L of the solution after leaching with sulfuric acid and hydrogen peroxide, add the positive electrode active material (10 dry-g), and stir at 600rpm at normal temperature (20-30°C), the oxidation-reduction potential ORP of the solution decreases to below 700mV (vs.Ag / AgCl). Furthermore, the pH of the solution rose above 3. show the result in image 3 . The composition of the positive electrode active material added was the same as that shown in Table 1. The time at which the positive electrode active material was added was 6.5 hours of the reaction time in the figure. Then, stirring was continued, and a decrease in the oxidation-reduction potential ORP and an increase in pH were observed. After adding the positive electrode active material, the ORP of the leached solution was 700 mV or less 8.5 hours later (15 hours after the start ...

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Abstract

Nickel, cobalt and lithium are efficiently leached from the positive electrode active material of lithium-ion secondary cell, obtaining solution suitable for isolating various metals. The invention relates to a method for leaching positive electrode active material which leaches valued metals from the positive electrode active materials of a lithium-ion formed by composite oxide having transition metals including at least manganese. The method comprises a first process which is to dissolve soluble parts of sulfuric acid solution in the positive electrode active material, and a second process which is no solid-liquid separation is conducted after the first process, and adding hydrogen peroxide in sulfuric acid leaching slurry solution, and leaching unleached parts in the left sulfuric acid leaching slurry.

Description

technical field [0001] The present invention relates to a method for leaching a valuable metal from a positive electrode active material of a lithium ion battery formed of a composite oxide composed of a transition metal containing at least manganese. Background technique [0002] As the leaching method of the positive electrode active material, there is a leaching method using inorganic acid and hydrogen peroxide in JP-A No. 10-287864 (Patent Document 1), and the metals in the positive electrode active material are respectively used in molar ratio 1-5 times of inorganic acid, hydrogen peroxide. In this method, since the inorganic acid and hydrogen peroxide are excessive, a large amount of acid and hydrogen peroxide remain in the leachate after leaching. Therefore, when a separation step such as solvent extraction is further provided in the subsequent step, it is necessary to add a neutralizing agent in order to neutralize the remaining acid. In addition, residual hydrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B3/08
CPCY02E60/12Y02P10/20Y02W30/84
Inventor 小林大祐山口阳介成迫诚中村泰夫山冈利至
Owner JX NIPPON MINING & METALS CO LTD
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