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Battery pole piece, preparation method thereof and secondary battery comprising the same

A technology for battery pole pieces and secondary batteries, which is applied in the direction of secondary batteries, electrode manufacturing, battery electrodes, etc. It can solve the problems of excessive dressing, uneven surface of pole pieces, and restrictions, and achieve high surface density and increase capacity and cycle performance effects

Inactive Publication Date: 2010-10-13
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are two defects in this method: first, the narrow space inside the battery case limits the thickness of the pole piece, thereby limiting the amount of dressing, making it difficult to increase the battery capacity; secondly, the amount of disposable dressing is too large, and it is easy to The dressing is uneven, easy to fall off, and the surface of the electrode sheet after dressing is not smooth, which will affect the cycle performance of the battery

Method used

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  • Battery pole piece, preparation method thereof and secondary battery comprising the same

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preparation example Construction

[0011] The specific embodiment of the present invention then provides a method for preparing the above-mentioned battery pole piece, which includes the following steps: firstly apply and / or fill the slurry containing the electrode active material on the current collector substrate, then dry and calender to obtain Pole pieces of electrode material;

[0012] Then repeat the following operation at least once to make a battery pole piece: coating and / or filling the slurry containing the electrode active material on the pole piece coated with the electrode material, then drying and calendering.

[0013] The battery pole piece obtained by the above method is made into a battery pole piece by completing the process of dressing→drying→calendering several times, so the electrode material on the current collector has at least two layers. Specifically, several times of dressing → Drying → calendering operation, there are several layers of electrode materials on the current collector. Mo...

Embodiment 1

[0047] 1. Preparation of lithium-ion secondary battery cathode sheet:

[0048] Preparation of positive electrode slurry: the positive active material lithium iron phosphate (LiFePO 4 ): Adhesive PVDF: Additive Carbon black is added to 700 grams of solvent N, N-dimethylpyrrolidone (NMP) in a mass ratio of 92:4:4, and mixed evenly to make a positive electrode slurry with a viscosity of 3000CP. LiFePO 4 , Adhesive, carbon black, solvent (NMP) consumption are respectively 9200 grams, 400 grams, 400 grams, 700 grams.

[0049] Primary dressing: Coat the positive electrode slurry obtained in the previous step on both surfaces of a 16 μm thick aluminum foil (positive current collector), then dry at 120°C for 0.5 hours, and finally roll it with a tablet machine to obtain a primary dressing the positive plate. The thickness of the positive electrode material on the positive electrode sheet of the first coating obtained after calendering (that is, the thickness of the double-sided coa...

Embodiment 2

[0056] According to the method of Example 1, the difference is that the thicknesses of the first and second dressings are 150 μm and 100 μm respectively, and correspondingly, the thicknesses of the first single-sided dressing and the second single-sided dressing are 75 μm and 50 μm respectively. The content of the positive electrode active material on each positive electrode sheet is 18.5g.

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Abstract

The invention provides a preparation method of a battery pole piece, a secondary battery pole piece and a secondary battery. The preparation method of the battery pole piece, which is provided by the invention, comprises the following step of repeatedly carrying out process flows of dressing, drying and calendering at least twice to prepare the battery pole piece, wherein the dressing flow is that size comprising an electrode active material is coated and / or filled on a substrate of a current collector or the current collector comprising an electrode material. Compared with the conventional process, when the dressing thickness is the same, the battery pole piece prepared by adopting the method provided by the invention has higher surface density of the electrode active material, thus, the battery has larger capacity.

Description

technical field [0001] The invention relates to a battery pole piece, a preparation method of the battery pole piece, and a secondary battery containing the pole piece. Background technique [0002] The amount of electrode active material contained on the battery pole piece is one of the factors affecting the battery capacity. Taking a lithium-ion secondary battery as an example, the amount of the positive electrode active material contained on the pole sheet, especially the positive electrode sheet, has a certain influence on the battery capacity and cycle performance. The traditional pole piece manufacturing process (disposable dressing forming process) is: the electrode slurry is coated on the electrode current collector at one time, and then dried and calendered to form a battery pole piece. In the case of a certain size of the current collector, the method of increasing the amount of one-time dressing on the current collector is often used to increase the content of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/24H01M4/36H01M4/04H01M4/30H01M10/00H01M10/36H01M10/40H01M10/30
CPCH01M4/1391H01M4/133Y02E60/122H01M4/0409H01M4/0435H01M4/366H01M4/0404H01M10/0525Y02E60/10H01M4/02H01M4/04H01M10/05
Inventor 张天赐许俊涛鄢小勇孙华军
Owner SHANGHAI BYD
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