Method for regenerating positive active material from waste lithium iron phosphate batteries

A technology for lithium iron phosphate batteries and positive active materials, which is applied in battery electrodes, secondary batteries, battery recycling, etc., and can solve the problems of complex recycling process, poor phase uniformity, and low recovery rate of target products

Active Publication Date: 2017-06-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the problems of existing recovered lithium iron phosphate materials such as many heterophases, poor phase uniformity, complicated recovery process, and low recovery rate of the target product, the present invention provides a method for regenerating the positive electrode active material of lithium iron phosphate batteries, aiming at Regeneration of battery-grade lithium iron phosphate in one step

Method used

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  • Method for regenerating positive active material from waste lithium iron phosphate batteries
  • Method for regenerating positive active material from waste lithium iron phosphate batteries
  • Method for regenerating positive active material from waste lithium iron phosphate batteries

Examples

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Effect test

Embodiment 1

[0079] Soak the waste lithium iron phosphate battery in 20g / L sodium chloride solution until the end-of-discharge voltage is 0.5V, and manually disassemble and separate the organic solvent, winding core and shell. The winding core is mechanically crushed, and the crushed particle size is 5mm. It is roasted in the air at 500°C for 5 hours, and then the active material and copper and aluminum foil are screened out by vibration. The roasting waste gas is absorbed by 40mg / L lime aqueous solution, and the copper foil is obtained by magnetic separation. and aluminum foil, the active material is leached with 2mol / L sulfuric acid, the pH value is controlled to 0.5, and the carbon residue and leachate are obtained by filtration and separation. Then add copper and Fe to the leachate 3+ 1.1 times the theoretical amount of iron powder, the Fe 3+ and Cu 2+ reduced to Fe 2+ and copper simple substance, remove the filter residue after filtering, then add appropriate amount of sodium hydro...

example 1

[0083] The electrochemical performance of the lithium iron phosphate that example 1 reclaims is as image 3 shown.

Embodiment 2

[0085]Soak the waste lithium iron phosphate battery in 30g / L sodium chloride solution until the end-of-discharge voltage is 0.1V, disassemble and separate the organic solvent, winding core and shell. The winding core is mechanically crushed, and the crushed particle size is 6mm. It is roasted in the air at 400°C for 10 hours, and then the active material and copper and aluminum foil are screened out by vibration. The roasting waste gas is absorbed by 40mg / L lime aqueous solution, and the copper foil is obtained by magnetic separation. and aluminum foil, the active material is leached with 5mol / L sulfuric acid, the pH value is controlled to be equal to 1, and the carbon residue and leachate are obtained by filtration and separation. Then the theoretical amount of copper removal and Fe in the leaching solution 3+ 1 times iron powder, remove the copper-containing filter residue after filtering, then add an appropriate amount of potassium hydroxide to the filtrate to adjust the pH...

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Abstract

The invention discloses a method for regenerating a positive active material from waste lithium iron phosphate batteries. The method comprises the steps as follows: 1) waste lithium iron phosphate batteries are discharged in saline water, and organic solvents, roll cores and casing materials are disassembled; 2) the roll cores are subjected to crushing, calcination and other steps, and active materials, copper foil and aluminum foil are separated through vibrating screening. Fluorine-containing waste gas is absorbed with lime water, the copper foil and the aluminum foil are separated with a magnetic separation method, the active materials are leached out with sulfuric acid, and a leachate and carbon residues are obtained through separation; 3) Cu<2+> in the leachate is reduced to elementary copper by adding iron powder, meanwhile, Fe<3+> is reduced to Fe<2+>, copper and excessive iron residues are filtered out, aluminum is removed through precipitation with an alkaline liquid, the filtrate is supplemented with a phosphorus source after filtration, the pH value is adjusted by adding the alkaline liquid, coarse lithium iron phosphate precipitates are produced, and finally, battery-grade lithium iron phosphate is obtained through sintering. Comprehensive utilization of the waste lithium iron phosphate batteries and regeneration of the active materials are realized with a simple, practical, economical and feasible method, no secondary pollution is produced, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of recycling lithium ion secondary batteries, in particular to a method for regenerating positive active materials from waste lithium iron phosphate batteries. Background technique [0002] With the rapid development of modern science and technology, the problem of social energy and environmental ecological pollution has become increasingly prominent, and the environmental and ecological pollution of various waste batteries has become the focus of social attention. Lithium iron phosphate batteries are widely used in power batteries and energy storage batteries due to their low cost, good cycle performance, and good safety performance. However, power and energy storage batteries usually require more battery materials than conventional small batteries. Therefore, in the next 3 to 5 years, a large number of lithium iron phosphate batteries will be scrapped, and their recycling has high social value. [0003] However, at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525H01M10/54
CPCH01M4/5825H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 方静杨声海刘文文赖延清张治安洪波张凯李劼
Owner CENT SOUTH UNIV
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