Method for repair and regeneration of waste lithium iron phosphate battery cathode material

A technology for lithium iron phosphate batteries and positive electrode materials, which is applied in battery recycling, solid waste removal, waste collector recycling, etc., to achieve the effects of clear recovery and repair objects, pollution mitigation, and clear battery brand names

Active Publication Date: 2011-10-05
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to avoid the shortcomings of the above-mentioned prior art, and provide a method for repairing and regenerating the positive electrode material of the waste lithium iron phosphate battery with simple...

Method used

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  • Method for repair and regeneration of waste lithium iron phosphate battery cathode material
  • Method for repair and regeneration of waste lithium iron phosphate battery cathode material
  • Method for repair and regeneration of waste lithium iron phosphate battery cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Weigh 2.5g of the lithium iron phosphate positive electrode material to be repaired, place it in a 50mL autoclave, then add 30mL of lithium oxalate solution with a lithium ion concentration of 0.3mol / L and 0.01g of vitamin C in the autoclave, and then Close the autoclave and react at 170°C for 36 hours. After the reaction is completed, the product is centrifuged and dried to obtain a liquid-phase lithium supplement material. Add the liquid-phase lithium supplement material and 0.125g glucose into 5mL distilled water to disperse and mix uniformly, and then in a nitrogen atmosphere First calcined at 350°C for 2 hours, and then calcined at 550°C for 6 hours to obtain a repaired lithium iron phosphate positive electrode material.

[0044] According to the ratio of lithium iron phosphate active material: conductive agent: binder mass ratio of 90:5:5, the electrode sheet is made, the metal lithium sheet is used as the negative electrode, the Celgard 2400 polypropylene porous m...

Embodiment 2

[0046] Weigh 3g of the lithium iron phosphate cathode material to be repaired, place it in a 50mL autoclave, and then add 30mL of lithium ion concentration to the autoclave as a lithium chloride solution of 1mol / L and 0.005g of hydrazine (N 2 h 4 ), then close the autoclave and react at 200°C for 10 hours. After the reaction is completed, the product is centrifuged and dried, and the material after liquid phase lithium supplementation, 0.3g sucrose and 0.03g copper nitrate monohydrate are ball milled at a speed of 400r / min 3h, and then calcined at 350°C for 3h under a nitrogen atmosphere, and then calcined at 650°C for 7h to obtain a repaired lithium iron phosphate cathode material.

[0047] According to the ratio of lithium iron phosphate active material: conductive agent: binder mass ratio of 90:5:5, the electrode sheet is made, the metal lithium sheet is used as the negative electrode, the Celgard 2400 polypropylene porous membrane is used as the diaphragm, and 1mol / L LiPF ...

Embodiment 3

[0049] Weigh 2g of the lithium iron phosphate positive electrode material to be repaired, place it in a 50mL ball mill jar, then add 0.096g of lithium carbonate, 0.2g of glucose and 0.06g of copper oxide to the ball mill jar, according to the ball-to-material ratio of 1:30 , add 70g of agate balls and 5mL of ethanol, then seal the ball mill jar, ball mill at 400r / min for 6h, filter and dry the product after the reaction is completed, calcinate at 350°C for 5h under nitrogen atmosphere, and then calcinate at 600°C for 12h to repair Good lithium iron phosphate cathode material.

[0050] According to the ratio of lithium iron phosphate active material: conductive agent: binder mass ratio of 90:5:5, the electrode sheet is made, the metal lithium sheet is used as the negative electrode, the Celgard 2400 polypropylene porous membrane is used as the diaphragm, and 1mol / L LiPF 6 A mixed solution of ethylene carbonate (EC) and dimethyl carbonate (DMC) (volume ratio 1:1) was used as the...

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Abstract

The invention discloses a method for repair and regeneration of waste lithium iron phosphate battery cathode materials, which allows a lithium-source solution or a suspension to react with a recovered waste lithium iron phosphate battery material by a hydrothermal reaction or a solvent-thermal reaction, or allows the recovered waste lithium iron phosphate battery material to be processed by solid-phase ball-milling and calcination with the lithium source, performs liquid-phase or solid-phase direct lithium-supplementing repair of delithiated waste lithium iron phosphate, and then performs pertinent repair and regeneration by coating conductive agents or coating conductive agents and doping metal ions. The invention adopts a direct repair and regeneration method; the repaired waste lithium iron phosphate battery cathode material has excellent performance, and the specific capacity can reach above 90% of the specific capacity before discard; the method not only can effectively reduce environmental pollution of waste batteries, but also can make full use of waste resources and changes waste into valuables.

Description

1. Technical field [0001] The invention relates to the recovery and reuse of waste batteries, in particular to a method for repairing and regenerating positive electrode materials of waste lithium iron phosphate batteries. 2. Background technology [0002] As a high-performance secondary green power source, lithium-ion batteries have been widely used in portable electronic products, communication tools and electric bicycles in recent years, and have been gradually developed as power sources for electric vehicles and new energy storage devices. Lithium iron phosphate (LiFePO) with olivine structure 4 ) as a new type of lithium-ion battery cathode material has the advantages of wide material sources, low price, high theoretical specific capacity (170mAh / g), good thermal stability, and environmental friendliness, and is expected to become the first choice for the new generation of lithium-ion batteries. Secondary battery cathode material. With the popularization and use of li...

Claims

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Application Information

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IPC IPC(8): H01M10/54B09B3/00
CPCY02E60/12Y02W30/84
Inventor 杨则恒翁韶迎张卫新王强裴波
Owner HEFEI UNIV OF TECH
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