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Preparation method of positive electrode of secondary lithium ion battery

A lithium-ion battery and positive electrode technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of increased difficulty in coating positive electrode slurry, easy peeling or falling off of positive electrode materials, and impact on battery performance, so as to improve the effect of foil coating , Reduce the difficulty of coating and facilitate the implementation

Active Publication Date: 2013-01-16
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem that the positive electrode material is easy to peel off or fall off due to the poor affinity between the current nanoscale or submicron positive electrode material and the current collector, the difficulty of coating the positive electrode slurry increases, and the performance of the battery is affected. The problem is to provide a method for preparing the positive electrode of a secondary lithium ion battery that uses positive electrode materials of different particle sizes, improves the affinity between the positive electrode material and the current collector through secondary coating, reduces the difficulty of coating the positive electrode slurry, and improves battery performance.

Method used

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  • Preparation method of positive electrode of secondary lithium ion battery

Examples

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Embodiment 1

[0028] The parts by weight are respectively 85 and 5 D 50 (Here refers to the particle size of 3 μm and accounts for more than 50% of the particle distribution range) 3 μm graphene and acetylene black are mixed evenly, then dissolved in N-methylpyrrolidone (PVDF) that has been dissolved with polyvinylidene fluoride (PVDF) NMP) (the parts by weight of PVDF and NMP are respectively 5 and 100), stir under vacuum and be evenly prepared into the positive electrode slurry of the base layer; the parts by weight are respectively 95 and 2.5 50 1 μm LiFePO 4 Mix evenly with acetylene black, then dissolve in NMP that has been dissolved with PVDF (the parts by weight of PVDF and NMP are respectively 2.5 and 100), stir evenly under vacuum to prepare the active layer positive electrode slurry; then select aluminum foil as the current collector , the base positive electrode slurry is evenly coated on both surfaces of 16 μm aluminum foil, and dried at 75 ° C, 85 ° C and 95 ° C for 5 minutes ...

Embodiment 2

[0036] The difference from Example 1 is that using D 50 Graphene with a thickness of 3 μm is formed on the surface of the aluminum foil with a base positive electrode layer with a thickness of 20 μm, and other process parameters remain unchanged.

Embodiment 3

[0038] The difference from Example 1 is that using D 50 (Here refers to the particle size of 5 μm and accounts for more than 50% of the particle distribution range) Graphene with a thickness of 5 μm forms a base positive electrode layer with a thickness of 80 μm on the surface of the aluminum foil, and other process parameters remain unchanged.

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Abstract

The invention discloses a preparation method of a positive electrode of a secondary lithium ion battery, comprising the following steps of: preparing positive electrode slurry of a base layer and positive electrode slurry of an active layer; uniformly coating the prepared positive electrode slurry of the base layer on the surface of a current collector which is used as a matrix, and fully drying to form a positive electrode layer of the base layer on the surface; uniformly coating the prepared positive electrode slurry of the active layer on the surface of the positive electrode layer of the base layer, and fully drying to obtain the positive electrode of the secondary lithium ion battery. The method has simple steps and is convenient to implement. Through a machinery mechanical interlocking effect generated between the positive electrode material of the base layer and the current collector and a bonding effect between the positive electrode material of the base layer and the positive electrode material of the active layer, good combination between the positive electrode slurry and the current collector can be realized, and the cladding effect of the positive electrode slurry is obviously improved.

Description

technical field [0001] The present invention relates to a preparation method of a secondary lithium ion battery, more specifically, to a preparation method of a positive electrode of a secondary lithium ion battery. Background technique [0002] At present, the application of lithium-ion batteries in mobile phones, portable computers, video cameras, cameras, etc. has occupied more than 70% of the global secondary battery market. In recent years, people have higher and higher requirements on the performance of lithium-ion batteries, and the methods of improving the overall performance of lithium-ion batteries by improving the performance of lithium-ion battery cathode materials are also getting deeper and deeper. Generally, the smaller the particle size of the positive electrode material, the shorter the path that lithium ions need to traverse when migrating in the material, so the higher rate charge and discharge performance is better. For phosphate-based positive electrode...

Claims

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Application Information

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IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 周明杰俞兆喆王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD