Method for regenerating electrode by using waste lithium battery and leaching residues

A waste lithium battery and leaching slag technology, which is applied in the field of solid waste resource utilization, can solve the problems of increased recycling cost, low price, waste of manganese metal, etc., achieve excellent electrochemical performance, short recycling process, and expand recycling economic benefits Effect

Inactive Publication Date: 2021-08-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the valuable metal nickel and cobalt, the price of manganese metal is lower, and the abundance is wider, so the leaching slag is discarded, resulting in waste of manganese metal
This will cause the components in the used lithium-ion batteries to be effectively recycled and produce secondary solid waste, which requires secondary treatment and increases the cost of recycling

Method used

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  • Method for regenerating electrode by using waste lithium battery and leaching residues
  • Method for regenerating electrode by using waste lithium battery and leaching residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment includes the following steps:

[0032] (1) The waste LiNi x co y mn z o 2 、LiCoO 2 and LiMn 2 o 4 Put the battery in 3M NaCl solution and discharge it for 12 hours. Take out the discharged battery and disassemble the lithium-ion battery into a casing, a separator, a positive electrode piece and a negative electrode piece in a glove box filled with argon gas. Dissolve the organic binder on the electrode piece in hot NMP at ℃, wash the separated positive and negative electrode materials with deionized water, dry them in a blast drying oven at 90°C for 12 hours, and grind them evenly to obtain waste mixed positive and negative electrode graphite powder. Aluminum foil and copper foil current collectors are recycled directly.

[0033] (2) Take 10 g of mixed positive electrode powder and 2 g of negative electrode graphite powder, and use a ball mill to mechanically mix for 2 hours to obtain a uniformly mixed powder, which is placed in an argon atmospher...

Embodiment 2

[0041] This embodiment includes the following steps:

[0042] (1) The waste LiNi x co y mnz o 2 、LiCoO 2 and LiMn 2 o 4 Put the battery in 3M NaCl solution and discharge it for 12 hours. Take out the discharged battery and disassemble the lithium-ion battery into a casing, a separator, a positive electrode piece and a negative electrode piece in a glove box filled with argon gas. Dissolve the organic binder on the electrode piece in hot NMP at ℃, wash the separated positive and negative electrode materials with deionized water, dry them in a blast drying oven at 90°C for 12 hours, and grind them evenly to obtain waste mixed positive and negative electrode graphite powder.

[0043] (2) Take 8 g of mixed positive electrode powder and 2 g of negative electrode graphite powder, and use a ball mill to mechanically mix for 1 h to obtain a uniformly mixed powder, which is placed in an argon atmosphere tube furnace for carbothermal reduction sintering, the reaction temperature is...

Embodiment 3

[0049] This embodiment includes the following steps:

[0050] (1) The waste LiNi x co y mn z o 2 、LiCoO 2 and LiMn 2 o 4 Put the battery in 3M NaCl solution and discharge it for 12 hours. Take out the discharged battery and disassemble the lithium-ion battery into a casing, a separator, a positive electrode piece and a negative electrode piece in a glove box filled with argon gas. Dissolve the organic binder on the electrode sheet in hot NMP at ℃, wash the separated positive and negative electrode materials with deionized water, dry them in a blast drying oven at 80°C for 12 hours, and grind them evenly to obtain waste mixed positive and negative electrode graphite powder.

[0051] (2) Take 10 g of mixed positive electrode powder and 2 g of negative electrode graphite powder, and use a ball mill to mechanically mix for 2 hours to obtain a uniformly mixed powder, which is placed in an argon atmosphere tube furnace for carbon thermal reduction sintering, the reaction tempe...

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Abstract

The invention discloses a method for regenerating an electrode by using a waste lithium battery and leaching residues. The method is characterized by comprising the following steps: 1) discharging and splitting waste LiNixCoyMnzO2, LiCoO2 and LiMn2O4 batteries, and dissolving the batteries with an organic solvent to obtain waste positive electrode mixed powder and negative electrode powder; 2) mechanically mixing the positive electrode powder and the negative electrode powder with a ball mill, and performing carbon thermal reduction treatment; (3) leaching the powder subjected to carbon thermal reduction with water, separating a leaching solution and leaching residues, and evaporating, concentrating and crystallizing the leaching solution to obtain lithium carbonate; (4) leaching the leaching residues by adopting reduced ammonia, and separating ammonia leaching liquid from the leaching residues to obtain a solution rich in high-purity valuable metal nickel and cobalt and manganese oxide leaching residues; and 5) sintering the leaching residues and the regenerated lithium carbonate in the step 2) in a muffle furnace to prepare the LiMn2O4 positive electrode. Based on mixing of multiple waste lithium battery positive and negative electrode materials and full utilization of waste residue regeneration materials in the recovery process, the method has the advantages that the recovery process is green and low in pollution, the recovered waste batteries are wide in source, and the electrochemical performance of regenerated lithium manganate is good.

Description

technical field [0001] The invention designs a recycling method for waste lithium batteries and waste leach slag, and belongs to the technical field of resource utilization of solid waste. Background technique [0002] In recent years, in order to reduce the excessive dependence on traditional fossil energy and improve urban air pollution caused by vehicle exhaust, governments of various countries have vigorously developed new energy industries, which has led to a large number of lithium-ion batteries being put into the market. However, the service life of batteries is limited. After a large number of lithium batteries are scrapped, improper disposal and disposal will cause environmental pollution, and a large number of valuable metal components in lithium batteries will cause a waste of valuable metal resources if they are not effectively recovered. The country is also gradually improving the waste lithium battery recycling market. For example, the National Development and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12C22B23/00C22B7/00H01M4/1391H01M4/505H01M10/0525H01M10/54
CPCC01G45/1242C22B23/0446C22B7/008H01M4/1391H01M4/505H01M10/0525H01M10/54H01M2004/028C01P2006/40Y02W30/84Y02P10/20Y02E60/10
Inventor 欧星李东民施尧张佳峰张宝
Owner CENT SOUTH UNIV
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