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Manufacturing method for lithium ion battery pole piece

A lithium-ion battery and pole piece technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of not being able to meet the needs of foam current collector electrode pole pieces, and cannot complete the production of pole pieces, so as to achieve good electrical performance and increase energy density. , the effect of reducing pollution

Active Publication Date: 2012-01-25
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its porosity is generally about 80%, and for such a large porosity, the traditional lithium-ion battery cannot satisfy the production of foam collector electrodes, mainly because the slurry cannot stay due to the existence of pores during the coating process. In the foam current collector, the critical step of pole piece production cannot be completed

Method used

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  • Manufacturing method for lithium ion battery pole piece
  • Manufacturing method for lithium ion battery pole piece
  • Manufacturing method for lithium ion battery pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Positive electrode sheet preparation: according to the need to cut the corresponding size of aluminum foam as the positive current collector. The positive electrode current collector is placed in a container, the container has a bottom and four walls, and the height of the four walls is greater than the thickness of the positive electrode body, and the container can be heated. Add LiCoO2 (lithium cobalt oxide), Super-P (superconducting carbon black), PVDF (polyvinylidene fluoride) in a mass ratio of 95.0:2.5:2.5 to NMP, mix and stir evenly to obtain a slurry with certain fluidity. The stirred slurry is poured on the surface of the aluminum foam current collector, so that the slurry is evenly distributed inside and on the surface of the foam current collector to obtain a positive wet electrode sheet. Then dry the positive wet pole piece at 60°C to obtain a dry positive pole piece, cold press the dry positive pole piece, and then weld the positive pole lug made of 0.4mm t...

Embodiment 2

[0044] Positive electrode sheet preparation: according to the need to cut the corresponding size of aluminum foam as the positive current collector. The positive electrode current collector is placed in a container, the container has a bottom and four walls, and the height of the four walls is greater than the thickness of the positive electrode body, and the container can be heated. Add LiMnO2 (lithium manganese oxide), conductive carbon black, and sodium carboxymethylcellulose (CMC) according to the mass ratio of 95.0:2.5:2.5 and add NMP (N-methylpyrrolidone) to mix and stir evenly to obtain a slurry with certain fluidity material. The stirred slurry is poured on the surface of the aluminum foam current collector, so that the slurry is evenly distributed inside and on the surface of the foam current collector to obtain a positive wet electrode sheet. Then dry the positive wet pole piece at 100°C to obtain a dry positive pole piece, cold press the dry positive pole piece, an...

Embodiment 3

[0048] Positive electrode sheet preparation: according to the need to cut the corresponding size of aluminum foam as the positive current collector. The positive electrode current collector is placed in a container, the container has a bottom and four walls, and the height of the four walls is greater than the thickness of the positive electrode body, and the container can be heated. Add LiNiO2 (lithium nickelate), lithium nickel cobalt manganese oxide, conductive carbon black, and styrene-butadiene rubber (SBR) according to the mass ratio of 90.0:5.0:2.5:2.5 and add NMP (N-methylpyrrolidone) to mix and stir evenly to obtain a Certain fluidity slurry. The stirred slurry is poured on the surface of the aluminum foam current collector, so that the slurry is evenly distributed inside and on the surface of the foam current collector to obtain a positive wet electrode sheet. Then dry the positive wet pole piece at 80°C to obtain a dry positive pole piece, cold press the dry positi...

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Abstract

The invention relates to the technical field of a lithium ion battery, and particularly relates to a manufacturing method for a lithium ion battery pole piece by using a foam metal as a current collector. The invention adopts a slurry pouring or powder forming method to settle the difficulty of a traditional coating process in coating slurry on a surface of a foam current collector and to acquire the lithium ion battery having high energy density and excellent electrical property. The foam current collector has large porosity and slurry can be filled in pores, thereby greatly reducing the space occupied by the current collector inside a battery, being capable of efficiently reducing the layer number of the battery and obviously promoting the energy density of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a method for preparing lithium ion battery pole pieces using foamed metal as a current collector. Background technique [0002] Lithium-ion battery is a battery with high energy density and good environmental performance. It has the advantages of high energy, high reliability, and good processability, so it is widely used in various portable electronic devices. [0003] The cells in a lithium-ion battery generally include a positive electrode sheet, a separator, and a negative electrode sheet that are superimposed on each other. The separator is spaced between adjacent positive and negative electrode sheets to insulate the two electrode sheets, and is used to maintain the electrolyte. . The positive and negative electrodes include positive and negative current collectors generally made of aluminum foil and copper foil respectively, and positive and negative diaphra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCY02E60/122Y02E60/10
Inventor 周铁刚陈杰王会勤余鹏梁家华李明吴凯
Owner DONGGUAN AMPEREX TECH
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