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Method for recycling valuable metal from waste lithium-ion power battery

A power battery and valuable metal technology, applied in battery recycling, waste collector recycling, recycling technology and other directions, can solve the problems of insignificant economic benefits, low recycling efficiency, complex process flow, etc., and achieve steps to reduce battery classification , considerable economic benefits, the effect of simple recycling process

Active Publication Date: 2017-09-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the recycling of waste lithium-ion batteries is to deal with LFP batteries and NCM batteries separately. This process method first needs to sort waste power batteries and separately process and recycle them. This method has low recovery efficiency and complicated process flow. , the economic benefit is not significant

Method used

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  • Method for recycling valuable metal from waste lithium-ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for recovering valuable metals in waste lithium-ion power batteries, such as figure 1 shown, including the following steps:

[0029] (1) Disassemble and shell the waste lithium-ion power battery after discharge to obtain the battery core;

[0030] (2) Disassemble and separate the positive electrode sheet from the battery core;

[0031] (3) The positive electrode sheet is calcined at 400°C for 4h in a nitrogen atmosphere, and the binder PVDF and separator in the battery core are pyrolyzed;

[0032] (4) The battery core obtained in step (3) is crushed and passed through an 80-mesh sieve, and the under-sieve is taken to obtain a mixed powder of LFP and NCM;

[0033] (5) Add 4mol / L sulfuric acid and 2ml hydrogen peroxide per gram to the mixed powder in sequence, the reaction temperature is 90°C, and the mass-volume ratio of the added mixed powder to sulfuric acid is 1 / 10 (kg / L) , filter to remove carbon residue to obtain leachate;

[0034] (6) Adjust the leachi...

Embodiment 2

[0041] (1) Disassemble and shell the waste lithium-ion power battery after discharge to obtain the battery core;

[0042] (2) Disassemble and separate the positive electrode sheet from the battery core;

[0043] (3) The positive electrode sheet is calcined at 500°C for 3 hours in a nitrogen atmosphere, and the binder PVDF and separator in the battery core are pyrolyzed;

[0044] (4) The battery core obtained in step (3) is crushed and passed through an 80-mesh sieve, and the under-sieve is taken to obtain a mixed powder of LFP and NCM;

[0045] (5) Add 3mol / L sulfuric acid and 4ml hydrogen peroxide per gram to the mixed powder in turn, the reaction temperature is 80°C, and the mass-volume ratio of the added mixed powder to sulfuric acid is 1 / 8 (kg / L) , filter to remove carbon residue to obtain leachate;

[0046] (6) Adjust the leaching solution with ammonia water to pH=2 to precipitate ferric phosphate, and filter to obtain the filtrate;

[0047] (7) Adjust the leaching sol...

Embodiment 3

[0053] (1) Disassemble and shell the waste lithium-ion power battery after discharge to obtain the battery core;

[0054] (2) Disassemble and separate the positive electrode sheet from the battery core;

[0055] (3) The positive electrode sheet is calcined at 600°C for 2 hours in a nitrogen atmosphere, and the binder PVDF and separator in the battery core are pyrolyzed;

[0056] (4) The battery core obtained in step (3) is crushed and passed through an 80-mesh sieve, and the under-sieve is taken to obtain a mixed powder of LFP and NCM;

[0057] (5) Add 2.5mol / L of sulfuric acid and 3ml of hydrogen peroxide per gram of material in turn to the mixed powder, the reaction temperature is 60°C, and the mass-volume ratio of the added mixed powder to sulfuric acid is 1 / 6 (kg / L ), filter to remove carbon residue to obtain leachate;

[0058] (6) Adjust the leaching solution with ammonia water to pH=2.5 to precipitate ferric phosphate, and filter to obtain the filtrate;

[0059] (7) A...

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Abstract

The invention discloses a method for recycling valuable metal from a waste lithium-ion power battery. The method comprises the steps of discharging, decomposing and separating the waste lithium-ion power battery to obtain a positive plate; roasting, crushing and sieving the positive plate in a nitrogen atmosphere to obtain a mixed powdery material of LFP and NCM; adding sulfuric acid and hydrogen peroxide sequentially into the mixed powdery material for reaction, after filtration, adjusting the pH of the lixivium by using ammonia water, then filtering again; adjusting the pH of the filtrate by using alkaline, then filtering again, extracting the secondary filtrate by using a phosphoric acid extraction agent, and then standing and separating out organic phases and an aqueous phase; adding solid sodium carbonate in the aqueous phase and depositing to obtain lithium carbonate; adding diluted sulfuric acid in the organic phases for back extraction, and then adjusting the pH after the nickel-cobalt-manganese ratio is adjusted; and finally, ageing to obtain a nickel-cobalt-manganese hydroxide. The recycling method is simple, enables the three elements and lithium-iron electric core to be processed at the same time, reduces the battery sorting step and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a method for recovering waste lithium ion batteries, in particular to a method for recovering valuable metals from waste lithium ion power batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, small self-discharge, and no memory effect. Since their commercialization, they have received extensive attention and applications. The cathode materials of lithium-ion power batteries include lithium iron phosphate (LFP) or nickel-cobalt-manganese (NCM) materials, etc. Lithium iron phosphate cathode materials have great advantages in the power battery market due to their safety, environmental protection, and good stability. . In 2014, my country's electric vehicles showed explosive growth, and at the same time, the number of scrapped batteries was increasing day by day. How to deal with these used batteries has become a major concern of the society; in addition, wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 刘春丽曹利娜
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY