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Lithium ion battery positive electrode plate and manufacturing method thereof

A lithium-ion battery and manufacturing method technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problem that the contact area between the activated carbon layer and the aluminum foil current collector is small, the current collector occupies a large space, and the electrode is conductive. In order to reduce the volume ratio of the current collector, improve the conductivity, and increase the coating amount

Pending Publication Date: 2017-11-24
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method is complex in process and high in cost, and the active material particles are not in direct contact with the current collector aluminum foil, the conductive area is small, and the improvement of the conductivity of the electrode is very limited; The production method of its two pole pieces” announced the use of an activated carbon layer as an interlayer between the current collector and the active material. This method has a small contact area between the activated carbon layer and the aluminum foil current collector, and the improvement of electron conduction is relatively limited, and it cannot solve the problem of the current collector. The disadvantage of taking up a lot of space

Method used

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  • Lithium ion battery positive electrode plate and manufacturing method thereof
  • Lithium ion battery positive electrode plate and manufacturing method thereof
  • Lithium ion battery positive electrode plate and manufacturing method thereof

Examples

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Embodiment 1

[0026] This embodiment provides a lithium-ion battery positive sheet, including a porous current collector aluminum foil (1) and a positive electrode material layer (2), the porous current collector aluminum foil (1) is distributed with through holes and non-through holes, the porous Both sides of the current collector aluminum foil (1) are coated with a positive electrode material layer (2).

[0027] Preferably, the thickness of the porous current collector aluminum foil (1) is 10-50 μm, the porosity of the porous current collector aluminum foil (1) is 5% to 40%, and the ratio of through holes on the porous current collector aluminum foil (1) is 2 %~35%.

[0028] Preferably, the equivalent diameter of the through hole and the non-through hole is 0.5-5 μm.

Embodiment 2

[0030] A positive electrode sheet of a lithium ion battery of the present embodiment and a manufacturing method thereof, comprising the following steps:

[0031] ①Take an aluminum foil with a thickness of 20 μm, and perform DC etching on the aluminum foil with the parameters of energizing current 0.7A and energizing time 0.5s;

[0032] ②The aluminum foil after DC etching is chemically etched by concentrated sulfuric acid. The equivalent diameter of the surface pores of the etched aluminum foil is 2.7 μm, the porosity is 31%, and the through hole ratio is 22%;

[0033] ③The positive lithium iron phosphate slurry is coated on both sides of the porous current collector aluminum foil (1) of this example through a coating machine, and the positive electrode sheet is obtained after drying, and then passed through a rolling machine, a slitting machine, and a winding A 5Ah aluminum shell square battery cell with a length of 110mm, a width of 60mm, and a thickness of 6mm was prepared b...

Embodiment 3

[0037] A positive electrode sheet of a lithium ion battery of the present embodiment and a manufacturing method thereof, comprising the following steps:

[0038] ① Take a current collector aluminum foil with a thickness of 20 μm, and perform DC etching on the current collector aluminum foil with the parameters of energizing current 1A and energizing time 0.5s;

[0039] ②The aluminum foil after DC etching is chemically etched by concentrated sulfuric acid. The equivalent diameter of the surface pores of the etched aluminum foil is 3 μm, the porosity is 30%, and the through hole ratio is 23%;

[0040] ③ Coat the positive electrode lithium iron phosphate slurry on both sides of the porous current collector aluminum foil (1) prepared in this example through a coating machine, and obtain the positive electrode sheet after drying, and then pass through a rolling machine, a slitting machine, The winding machine prepares the cell, the cell length is 110mm, the width is 60mm, and the t...

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Abstract

The invention provides a lithium ion battery positive electrode plate and a manufacturing method thereof. The lithium ion battery positive electrode plate comprises porous current collector aluminum foil and positive electrode material layers, through holes and non-through holes are distributed on the porous current collector aluminum foil, and the two sides of the porous current collector aluminum foil are coated with the positive electrode material layers. The manufacturing method of the lithium ion battery positive electrode plate comprises the following steps that 1, current collector aluminum foil with the thickness of 10-50 micrometers is taken, and the surface of the current collector aluminum foil is subjected to a direct-current etching process; 2, the current collector aluminum foil processed through the step 1 is subjected to a chemical etching process with oxidative acid, and then the porous current collector aluminum foil can be obtained; 3, the two side faces of the porous current collector aluminum foil are coated with the positive electrode material layers, and then drying is conducted; and 4, rolling compaction is conducted to obtain the positive electrode plate of a lithium ion battery. According to the lithium ion battery positive electrode plate, by adopting the porous current collector aluminum foil, the adhesive power between a current collector and active material particles is effectively improved, the contact resistance is reduced, the active material coating amount is increased, the space ratio of the current collector is decreased, and the usability of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery positive electrode sheet using porous aluminum foil as a current collector and a manufacturing method thereof. Background technique [0002] With the development of society, people's requirements for energy storage and green environmental protection have been greatly improved. Lithium-ion batteries, as a high-energy-density, green and environmentally friendly energy storage method, are more and more used in people's work and life. Electrode manufacturing is one of the most important processes of lithium-ion batteries. In the traditional manufacturing method, there are disadvantages such as poor adhesion between the current collector and the active material particles, high contact resistance, and large space occupied by the current collector. To a large extent, the performance of lithium-ion batteries is limited. [0003] Many domestic scholars...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/80H01M4/1391H01M4/1397H01M10/0525
CPCH01M4/1391H01M4/1397H01M4/661H01M4/80H01M10/0525Y02E60/10
Inventor 张朝阳张同富张伟涛
Owner ZHENGZHOU BAK BATTERY CO LTD
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