Preparation method of lithium iron phosphate positive plate with high rate and superior low-temperature performance

A technology of lithium iron phosphate and positive pole piece, which is applied in the field of production of lithium iron phosphate positive pole piece, can solve the problems of high cost, reduced density, large amount of graphene doping, etc., and achieves low cost, rate performance and low temperature performance. Increased, less dosage effect

Active Publication Date: 2014-12-24
JIANGSU RONGHUI GENERAL LITHIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the lithium iron phosphate doped with graphene method improves the rate performance of lithium iron phosphate most obviously, but requires a relatively large amount of graphene doping, which not only costs high, but also greatly reduces the density, resulting in a decrease in the energy density of lithium iron phosphate batteries. Small

Method used

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  • Preparation method of lithium iron phosphate positive plate with high rate and superior low-temperature performance
  • Preparation method of lithium iron phosphate positive plate with high rate and superior low-temperature performance
  • Preparation method of lithium iron phosphate positive plate with high rate and superior low-temperature performance

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1) Take a current collector aluminum foil and soak it in 10% lithium chloride solution for 60 minutes, take it out, then wash it with water and dry it to get a pretreated current collector aluminum foil;

[0020] (2) Take 3g of graphene and disperse it in 2L of pure water by ultrasonic to prepare a graphene suspension with a concentration of 1.5g / L;

[0021] (3) Add the binder polyvinyl alcohol to the graphene suspension prepared in step (2) in an amount of 0.15g, heat up to 80°C and stir for 3 hours to fully dissolve, and then apply to the graphene suspension prepared in step (1). On the current collector aluminum foil pretreated by the method described above, and then dry at 110°C in a vacuum state to obtain a graphene-coated current collector aluminum foil, and the thickness of one side of the coated graphene is detected to be 10 microns;

[0022] (4) Take 2.1kg of lithium iron phosphate and dry it under vacuum at 200°C until the water content of lithium iron phosph...

Embodiment 2

[0027] (1) Take a current collector aluminum foil and soak it in 30% lithium chloride solution for 30 minutes, take it out, then wash it with water and dry it to get a pretreated current collector aluminum foil;

[0028] (2) Take 0.6g of graphene and disperse it in 2L of pure water by ultrasonic to prepare a graphene suspension with a concentration of 0.3g / L;

[0029] (3) Add the binder polyvinyl alcohol to the graphene suspension prepared in step (2) in an amount of 0.06g, heat up to 80°C and stir for 3 hours to fully dissolve, and then apply to the graphene suspension prepared in step (1). On the current collector aluminum foil pretreated by the method described above, and then dry at 90°C in a vacuum state to obtain a graphene-coated current collector aluminum foil, and the thickness of one side of the coated graphene is detected to be 1 micron;

[0030] (4) Take 2.1kg of lithium iron phosphate and dry it in a vacuum state at 180°C until the water content of lithium iron ph...

Embodiment 3

[0035] (1) Take a current collector aluminum foil and soak it in 20% lithium chloride solution for 40 minutes, take it out, then wash it with water and dry it to get a pretreated current collector aluminum foil;

[0036] (2) Take 1.6g of graphene and disperse it in 2L of pure water by ultrasonic to prepare a graphene suspension with a concentration of 0.8g / L;

[0037] (3) Add the binder polyvinyl alcohol to the graphene suspension prepared in step (2), the addition amount is 0.12g, heat up to 80°C and stir for 3 hours to fully dissolve, and then apply to the graphene suspension prepared in step (1). On the current collector aluminum foil pretreated by the method described above, and then dry at 100°C in a vacuum state to obtain a graphene-coated current collector aluminum foil, and the thickness of one side of the coated graphene is detected to be 5 microns;

[0038] (4) Take 2.1kg of lithium iron phosphate and dry it under vacuum at 190°C until the water content of lithium ir...

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Abstract

The invention discloses a preparation method of a lithium iron phosphate positive plate with high rate and superior low-temperature performance. The preparation method comprises the following steps: pretreating a current collector aluminum foil with a lithium chloride solution; adding a water-soluble binder to pre-prepared graphene suspension liquid; coating the pretreated current collector aluminum foil with the graphene suspension liquid and drying in vacuum; mixing dried lithium iron phosphate with a conductive agent, a binder and a solvent in a ratio to prepare slurry, coating the dried current collector aluminum foil with the slurry, and drying in vacuum; and rolling and slicing to obtain the lithium iron phosphate positive plate with high rate. The lithium iron phosphate positive plate prepared by the method has very high rate performance and superior low-temperature performance, is low in cost due to small use amount of graphene, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for manufacturing a positive electrode sheet of a lithium ion battery, in particular to a method for manufacturing a lithium iron phosphate positive electrode sheet with a high rate and excellent low-temperature performance. Background technique [0002] Lithium iron phosphate is popular because of its safe olivine structure, cheap raw materials and environmental protection. It is considered to be one of the ideal cathode materials for lithium-ion batteries. Due to the poor rate performance and low temperature performance of lithium iron phosphate electrodes, its application in the field of power batteries is greatly limited [0003] At present, the methods to improve the rate performance and low-temperature performance of lithium iron phosphate electrodes include: doping lithium iron phosphate, nanotechnology of lithium iron phosphate, carbon coating on the surface of lithium iron phosphate, method of doping lithium i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCH01M4/1397H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 何国端李南平蒋燕锋
Owner JIANGSU RONGHUI GENERAL LITHIUM IND CO LTD
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