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Lithium-ion secondary battery and preparation method for pole piece thereof

A secondary battery and lithium ion technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems that the appearance and performance of the pole piece of the multilayer diaphragm are difficult to guarantee, and achieve improved electrochemical performance and safety performance, The effect of improving the appearance

Inactive Publication Date: 2011-02-09
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to ensure the appearance and performance of the pole piece with multi-layer diaphragms made according to the existing methods

Method used

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  • Lithium-ion secondary battery and preparation method for pole piece thereof
  • Lithium-ion secondary battery and preparation method for pole piece thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The production of the positive electrode sheet: the positive electrode active material lithium cobaltate (LiCoO 2 ), the conductive agent carbon black, the binder polyvinylidene fluoride (PVDF) and the solvent N-methylpyrrolidone (NMP) are uniformly mixed in a weight ratio of 95:2:3:80 to obtain the first positive electrode slurry to be coated material; uniformly coat the first positive electrode slurry on an aluminum foil current collector with a thickness of 14 microns, the coating thickness is about 25 microns, and then dry at 150°C to obtain the first positive electrode membrane layer; wet the first positive electrode with NMP Positive electrode membrane layer for 1 minute; the positive electrode active material lithium cobaltate (LiCoO 2 ), the conductive agent carbon black, the binder polyvinylidene fluoride (PVDF) and the solvent N-methylpyrrolidone (NMP) in a weight ratio of 97:1.5:1.5:80 to uniformly mix the second positive electrode slurry Coating on the bake...

Embodiment 2

[0036] The production of the positive electrode sheet: the positive electrode active material lithium cobaltate (LiCoO 2 ), the conductive agent carbon black, the binder polyvinylidene fluoride (PVDF) and the solvent N-methylpyrrolidone (NMP) are uniformly mixed in a weight ratio of 95:2:3:80 to obtain the positive electrode slurry to be coated; The positive electrode slurry was uniformly coated on an aluminum foil current collector with a thickness of 14 microns, and the thickness of the coating was about 50 microns, and then dried at 150° C. to prepare a positive electrode sheet.

[0037]The making of negative plate: artificial graphite of negative electrode active material, conductive agent carbon black, binder carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) and solvent water are by weight 93:2:2:3:100 Mix evenly to obtain the first negative electrode slurry to be coated; uniformly coat the negative electrode slurry on a copper foil current collector with a...

Embodiment 3

[0040] The making of positive electrode sheet, the making of negative electrode sheet and the making of lithium ion secondary battery are basically the same as embodiment 1, and difference is: in embodiment 3, the thickness of the first positive electrode diaphragm layer of positive electrode sheet is 1 micron, negative electrode The thickness of the negative electrode diaphragm of the sheet was 31.2 microns.

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Abstract

The invention discloses a method for preparing a lithium-ion secondary battery pole piece. The method comprises the following steps of: providing a collector; coating first slurry on the collector and drying the slurry to form a first membrane layer; wetting the first membrane layer by using a solvent; and coating second slurry on the first membrane layer and drying the slurry to form a second membrane layer. In the method for preparing the lithium-ion secondary battery pole piece, the dried first membrane layer is wetted by adopting the solvent, and the wetted first membrane layer does not absorb or absorbs little solvent in the second slurry, so the second membrane layer can be uniformly spread, and the appearance of the lithium-ion secondary battery pole piece is improved. Moreover, the invention also discloses a lithium-ion secondary battery with good safety performance.

Description

technical field [0001] The invention relates to a lithium ion secondary battery, in particular to a preparation method of a lithium ion secondary battery pole piece with good appearance and a lithium ion secondary battery with good safety performance. Background technique [0002] Lithium-ion secondary batteries have the advantages of high specific capacity, high operating voltage, wide operating temperature range, low self-discharge rate, long cycle life, no pollution and light weight, so they are widely used in the industry. [0003] A lithium ion secondary battery includes a positive electrode sheet, a negative electrode sheet, a separator spaced between the positive electrode sheet and the negative electrode sheet, and an electrolyte. Wherein, the positive electrode sheet includes a positive electrode current collector and a positive electrode diaphragm attached to the positive electrode current collector, and the negative electrode sheet includes a negative electrode cu...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525H01M4/139
CPCY02E60/122Y02E60/10
Inventor 陈治汪颖赵丰刚于子龙林楠潘香英谢远森任建勋胡佳佳
Owner DONGGUAN AMPEREX TECH
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