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Pretreatment method of failure lithium ion battery positive electrode material

A positive electrode material and pretreatment technology, applied to battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as unsatisfactory lithium supplementation effects, achieve improved regeneration efficiency and performance indicators, simple and efficient procedures, and good repeatability Effect

Pending Publication Date: 2020-07-03
武汉瑞杰特材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is convenient and quick, but the effect of lithium supplementation is not ideal, and the ratio of Li / Me after lithium supplementation usually does not exceed 90%

Method used

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  • Pretreatment method of failure lithium ion battery positive electrode material
  • Pretreatment method of failure lithium ion battery positive electrode material
  • Pretreatment method of failure lithium ion battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A method for pretreatment of positive electrode materials of invalid lithium-ion batteries, comprising the following steps:

[0052] S1 Weigh 7.66g of LiOH into a beaker with an electronic balance, add 80ml of distilled water with a pipette, stir magnetically for 20min to dissolve, and prepare a 4mol / L lithium salt solution.

[0053] S2 uses ICP to test the failed cathode material NCM523 (LiNi 0.5 co 0.2 mn 0.3 o 2), the Li / Me ratio in the present embodiment is measured to be 0.81, and the ratio of lithium deficiency is 0.19. Weigh 25.0 g of the failed cathode material, add the lithium salt solution of S1, so that the molar ratio of lithium in the lithium salt solution to the failed cathode material is 3.5, which is 17 times the lithium deficiency ratio x, and stir magnetically for 10 minutes to obtain a mixture.

[0054] S3 Transfer the mixture of S2 to a high-pressure hydrothermal kettle with a PTFE liner, and perform a hydrothermal reaction at a temperature of 20...

Embodiment 2

[0060] A method for pretreatment of positive electrode materials of invalid lithium-ion batteries, comprising the following steps:

[0061] S1 weighs 22.17g of Li with an electronic balance 2 CO 3 In the beaker, add 60ml of distilled water with a pipette, stir magnetically for 10min to dissolve, and configure a 5mol / L lithium salt solution.

[0062] S2 Testing the failed cathode material LiCoO with ICP 2 The Li / Co ratio in the present embodiment is measured to be 0.60, and the ratio of lithium deficiency is 0.40. Weigh 56g of the failed positive electrode material, add the lithium salt solution of S1, so that the molar ratio of lithium in the lithium salt solution to the failed positive electrode material is 3, which is 7.5 times the lithium deficiency ratio x, and stir magnetically for 10 minutes to obtain a mixture.

[0063] S3 Transfer the mixture of S2 to a high-pressure hydrothermal kettle with a PTFE liner, and perform a hydrothermal reaction at a temperature of 240 °...

Embodiment 3

[0068] A method for pretreatment of positive electrode materials of invalid lithium-ion batteries, comprising the following steps:

[0069] S1 Use an electronic balance to weigh 0.72g of LiOH into a beaker, add 30ml of distilled water with a pipette, and stir for 10 minutes to dissolve, and prepare a 1mol / L lithium salt solution;

[0070] S2 Using ICP to test the failed cathode material LiFePO 4 The ratio of Li / Fe in this embodiment is measured to be 0.65, and the ratio of lithium deficiency is 0.35. Weigh 2.37g of the failed positive electrode material, add the lithium salt solution of S1, so that the molar ratio of lithium in the lithium salt solution to the failed positive electrode material is 2, which is 5.7 times the lithium deficiency ratio x, and stir magnetically for 10 minutes to obtain a mixture.

[0071] S3 Transfer the mixture of S2 to a high-pressure hydrothermal kettle with PTFE lining, and perform a hydrothermal reaction at a temperature of 180°C. During the p...

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Abstract

The invention provides a pretreatment method of a failure lithium ion battery positive electrode. The pretreatment method comprises the following steps: S1, weighing a lithium salt, and adding water to prepare a lithium salt solution with a concentration of greater than or equal to 0.1 mol / L, wherein the lithium salt is an inorganic lithium salt; S2, testing the lithium deficiency ratio x of a failure positive electrode material, and mixing the lithium salt solution obtained in the S1 and the failure positive electrode material to obtain a mixture, wherein the molar ratio of the lithium in thelithium salt solution to the positive electrode material is greater than or equal to the lithium deficiency ratio x of the failure positive electrode material; S3, carrying out a hydrothermal reaction on the mixture obtained in the S2 in a high-pressure hydrothermal kettle, and monitoring the Li<+> concentration of the mixture in the kettle until the concentration is not continuously reduced so as to complete the reaction, wherein the hydrothermal reaction temperature is greater than or equal to 100 DEG C; and S4, cooling, filtering to remove the solvent, washing with water to remove the residual lithium salt, and drying to obtain the lithium-supplementing positive electrode material. The method provided by the invention can improve the regeneration efficiency and performance index of therecycled material, has good repeatability, high resource utilization rate and simple and efficient process, and has high social and economic values.

Description

technical field [0001] The invention relates to a treatment method for recovering and repairing a decommissioned lithium ion battery material, in particular to a method for pretreatment of anode material of an invalid lithium ion battery, and belongs to the field of waste lithium ion battery recovery and resource recycling. Background technique [0002] In recent years, the fast-growing consumer electronics, electric vehicle and energy storage markets have seen a surge in demand for lithium-ion batteries, bringing with them a large number of decommissioned batteries. According to statistics, in 2018, China's cumulative waste lithium batteries reached 12.08GWH, and the cumulative scrap volume will reach about 172,500 tons. If ordinary waste disposal methods are adopted, the cobalt, nickel, lithium, manganese and other metals as well as inorganic and organic compounds will definitely cause serious pollution. However, high-priced rare metals such as lithium, cobalt, and nickel...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M10/42H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M10/54H01M10/4242H01M4/505H01M4/525H01M4/5825H01M10/0525H01M2004/028Y02W30/84Y02E60/10
Inventor 不公告发明人
Owner 武汉瑞杰特材料有限责任公司
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