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Method for recycling lithium iron phosphate positive electrode material in waste lithium ion battery

A technology for lithium ion batteries and lithium iron phosphate, which is applied in the field of resource recycling and reuse of lithium iron phosphate cathode materials for waste lithium ion batteries, can solve the problem that it is difficult for the inventor to realize, the properties of recycled materials are very different, and the cathode materials are difficult to achieve. Complete re-repair of electrochemical activity, etc., to achieve the effects of excellent cycle reversibility, excellent electrochemical activity, and easy large-scale industrial production

Active Publication Date: 2017-07-28
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventor has studied the methods of solid phase repair and hydrothermal repair, and found that it is difficult to completely restore the electrochemical activity of the positive electrode material in this method. Including the number of cycles and whether there is indiscriminate use, etc.), the properties of recycled materials will vary greatly (including particle size, processing performance, specific surface area, carbon content, etc.)
As we all know, lithium iron phosphate power batteries usually have high requirements for various technical indicators of positive electrode materials, and the inventor believes that it is difficult to realize its simple repair and regeneration for power batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of lithium iron phosphate-based composite material: Soak the lithium iron phosphate positive electrode sheet separated from the waste lithium-ion battery in a sodium hydroxide solution with a molar concentration of 0.2mol / L for 20 minutes, rinse in deionized water for 10 minutes, Then, under a nitrogen atmosphere, calcined at 450°C for 2 hours to separate the positive electrode active material from the aluminum foil, dry, grind, and sieve to obtain the pretreated lithium iron phosphate material; the recovered lithium iron phosphate material, sulfurous acid Iron and organic additive polyvinyl alcohol are mixed uniformly by ball milling at a mass ratio of 1:0.2:0.1; the resulting mixture is subjected to a high temperature treatment at 600°C for 2 hours under the protection of nitrogen, cooled, pulverized, and sieved to obtain a lithium iron phosphate-based composite material .

[0025] Preparation of lithium iron phosphate-based composite material negative ele...

Embodiment 2

[0028] Preparation of lithium iron phosphate-based composite material: Soak the lithium iron phosphate positive electrode sheet separated from the waste lithium-ion battery in a sodium hydroxide solution with a molar concentration of 0.05mol / L for 15 minutes, rinse in deionized water for 15 minutes, Then, under a nitrogen atmosphere, calcined at a high temperature of 550°C for 1.5 hours to separate the positive electrode active material from the aluminum foil, dry, grind, and sieve to obtain the pretreated lithium iron phosphate material; the recovered lithium iron phosphate material, oxalate Iron and organic additive ascorbic acid are ball-milled and mixed uniformly at a mass ratio of 1:0.3:0.05; the resulting mixture is subjected to a high temperature treatment at 700°C for 1 hour under nitrogen protection, cooled, pulverized, and sieved to obtain a lithium iron phosphate-based composite material.

[0029]Preparation of lithium iron phosphate-based composite material negative...

Embodiment 3

[0032] Preparation of lithium iron phosphate-based composite material: Soak the lithium iron phosphate positive electrode sheet separated from the waste lithium-ion battery in a sodium hydroxide solution with a molar concentration of 0.1mol / L for 30 minutes, rinse in deionized water for 20 minutes, Then, under a nitrogen atmosphere, calcined at a high temperature of 500°C for 1 hour to separate the positive electrode active material from the aluminum foil, dry, grind, and sieve to obtain the pretreated lithium iron phosphate material; the recovered lithium iron phosphate material, sulfurous acid Iron and organic additive glucose were ball milled and mixed uniformly at a mass ratio of 1:0.6:0.3; the resulting mixture was subjected to a high temperature treatment at 600°C for 2 hours under the protection of nitrogen, cooled, pulverized, and sieved to obtain a lithium iron phosphate-based composite material.

[0033] Preparation of lithium iron phosphate-based composite material n...

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Abstract

The invention discloses a method for recycling a lithium iron phosphate positive electrode material in a waste lithium ion battery, belonging to the field of recovery technologies for lithium iron phosphate positive electrode materials in waste lithium ion batteries and the field of alkaline secondary batteries. According to a technical scheme in the invention, the lithium iron phosphate positive electrode material in the waste lithium ion battery is used as a raw material and uniformly mixed with a ferric salt and an organic additive so as to obtain a mixture; then the mixture is subjected to calcining in an inert atmosphere so as to prepare a lithium iron phosphate-based composite material; and the lithium iron phosphate-based composite material is used for preparation of the negative electrode of an alkaline secondary battery. The method provided by the invention can efficiently recycle waste lithium ion battery positive electrode materials and apply the recycled waste lithium ion battery positive electrode materials to the negative electrode of an alkaline secondary battery, so cyclic regeneration and utilization of the waste lithium iron phosphate material are realized.

Description

technical field [0001] The invention belongs to the field of recovery technology of lithium iron phosphate positive electrode materials of waste lithium ion batteries and the field of alkaline secondary batteries, and specifically relates to a resource recovery and reuse method of lithium iron phosphate positive electrode materials of waste lithium ion batteries. Background technique [0002] In recent years, thanks to the continuous policy support of the Chinese government, the gradual strengthening of the public's awareness of environmental protection, and the continuous efforts of a number of domestic universities, research institutes and enterprises in the research and development of power batteries, battery management systems, etc., my country's The electric vehicle market has developed rapidly. With the rapid industrialization of new energy vehicles, their sales will increase by leaps and bounds, and the amount of lithium-ion power batteries will also increase exponenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/58H01M4/26
CPCH01M4/26H01M4/5825H01M10/54Y02E60/10Y02W30/84
Inventor 上官恩波郭利坦李晶王芹宁飒爽李菲常照荣李全民
Owner HENAN NORMAL UNIV
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