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Method for efficiently leaching lithium from high-aluminum waste lithium iron phosphate battery positive electrode material

A technology for lithium iron phosphate batteries and positive electrode materials, which is applied in secondary batteries, battery recycling, circuits, etc., can solve the problem that lithium and other metals are difficult to selectively recycle, and achieve easy industrial production, low corrosion, and simple process Effect

Pending Publication Date: 2022-05-24
GREEN IND INNOVATION RES INST OF ANHUI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for efficiently leaching lithium from the positive electrode material of high-aluminum waste lithium iron phosphate batteries, so as to solve the problem that lithium and other metals in lithium batteries are difficult to selectively recycle in the prior art

Method used

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  • Method for efficiently leaching lithium from high-aluminum waste lithium iron phosphate battery positive electrode material

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Effect test

Embodiment 1

[0025] A method for efficiently extracting lithium from the cathode material of high-alumina scrap lithium iron phosphate battery, comprising the following steps:

[0026] (1) Weigh 10g of high alumina waste lithium iron phosphate battery cathode material powder in a 250ml three-mouth flask, add 100ml, pH = 1.5 citric acid, and add 4ml of hydrogen peroxide with a mass fraction of 30% drop by drop;

[0027] (2) Place the three-mouth flask in step 1 above at room temperature, and react at a stirring speed of 300 rpm for 60 min;

[0028](3) After the reaction is completed, the reaction liquid is filtered and washed, and the filtrate is a solution containing lithium, phosphorus, iron and aluminum.

[0029] Measure li in its filtrate + The leaching rate is 90.03% Fe 2+ / Fe 3+ The leaching rate is 2.3%, Al 3+ The leaching rate is 28.9%.

Embodiment 2

[0031] A method for efficiently extracting lithium from the cathode material of high-alumina scrap lithium iron phosphate battery, comprising the following steps:

[0032] (1) Weigh 10g of high alumina waste lithium iron phosphate battery cathode material powder in a 250ml three-mouth flask, add 100ml, pH = 2 citric acid, and add 4ml of hydrogen peroxide with a mass fraction of 30% drop by drop;

[0033] (2) Place the three-mouth flask in step 1 above at room temperature, and react at a stirring speed of 300 rpm for 60 min;

[0034] (3) After the reaction is completed, the reaction liquid is filtered and washed, and the filtrate is a solution containing lithium, phosphorus, iron and aluminum.

[0035] Measure li in its filtrate + The leaching rate is 92.3% Fe 2+ / Fe 3+ The leaching rate is 8.4%, Al 3+ The leaching rate is 35.3%.

Embodiment 3

[0037] A method for efficiently extracting lithium from the cathode material of high-alumina scrap lithium iron phosphate battery, comprising the following steps:

[0038] (1) Weigh 10g of high alumina waste lithium iron phosphate battery cathode material powder in a 250ml three-mouth flask, add 100ml, pH = 2 citric acid, and add 10ml of hydrogen peroxide with a mass score of 30% drop by drop;

[0039] (2) Place the three-mouth flask in step 1 above at room temperature, and the reaction at 300 rpm stirring speed is 90min;

[0040] (3) After the reaction is completed, the reaction liquid is filtered and washed, and the filtrate is a solution containing lithium, phosphorus, iron and aluminum.

[0041] Measure its filtrate where Li + The leaching rate is 91.5% Fe2+ / Fe 3+ The leaching rate was 12.3% Al 3+ The leaching rate was 41.6%.

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Abstract

The invention discloses a method for efficiently leaching lithium from a high-aluminum waste lithium iron phosphate battery positive electrode material, which comprises the following steps: (1) taking the high-aluminum waste lithium iron phosphate battery positive electrode material, taking organic acid as a leaching agent, and taking hydrogen peroxide as a reducing agent; (2) stirring and reacting the system in the step (1) at normal temperature to obtain a reaction solution; and (3) filtering the reaction liquid obtained in the step (2) to obtain filtrate containing lithium, phosphorus, iron and aluminum elements. The pH range of the used organic acid is 1.5-4, the lithium ions are selectively leached at the room temperature, and the leaching rate of other impurity ions is low; under the condition that the leaching rates of lithium ions are roughly the same, compared with the prior art, the consumption of organic acid is less; and the leaching rate is 90% or above at the normal temperature, heating is not needed, the energy consumption needed by the reaction is greatly reduced, and the industrial production cost is low. The method is simple in process, low in cost and easier for industrial production.

Description

Technical field [0001] The present invention relates to the field of lithium battery material recovery method, specifically a method for efficiently extracting lithium from the cathode material of high alumina scrap lithium iron phosphate battery. Background [0002] Lithium iron phosphate battery, is a kind of lithium iron phosphate (LiFePO 4 Lithium-ion batteries with carbon as the cathode material and carbon as the negative electrode material. Lithium iron phosphate batteries have the advantages of large energy density, long cycle life, small self-discharge rate, no memory effect, low cost, non-toxic and high capacity and excellent cycle performance, and are widely used in electric vehicles and energy storage industries. [0003] According to data from the China Automotive Technology and Research Center, the cumulative decommissioning of China's power batteries will be about 200,000 tons in 2020, and the cumulative decommissioning volume in 2025 is expected to be about 780,000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C21B15/00C22B26/12C22B21/00H01M10/0525H01M10/054
CPCC22B7/007C22B26/12C22B21/0023C21B15/00H01M10/054H01M10/0525Y02W30/84
Inventor 周自圆陈安琪刘志启闫东强李娜赵鹏程
Owner GREEN IND INNOVATION RES INST OF ANHUI UNIV
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