Lithium ion battery pole piece and preparation method thereof

A lithium-ion battery and pole piece technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of rising battery manufacturing costs and declining electrical performance, and achieve short soaking time, reduced pressure, The effect of high craftsmanship

Inactive Publication Date: 2021-03-09
JIANGSU FRONT NEW ENERGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of increased battery manufacturing cost and decreased electrical performance caused by the high compacted density electrode sheet in the prior art due to the difficulty in infiltrating the electrolyte, and to provide a lithium ion battery electrode sheet and a preparation method thereof

Method used

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  • Lithium ion battery pole piece and preparation method thereof
  • Lithium ion battery pole piece and preparation method thereof
  • Lithium ion battery pole piece and preparation method thereof

Examples

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Embodiment 1

[0029] See figure 2 , the present invention has a lithium-ion battery pole piece, including a current collector 10, an active material layer 20 coated on the surface of the current collector 10, and an electrolyte immersion channel 30 distributed on the active material layer 20; the electrolyte immersion channel 30 includes at least one transverse wetting channel 31 and at least one longitudinal wetting channel 32 perpendicular to the transverse wetting channel 31 .

[0030] More specifically in this embodiment, the thickness of the active material layer 20 is 60 μm˜100 μm. The active material layer 20 is made of lithium iron phosphate, conductive carbon black, and binder PVDF uniformly mixed and coated on the current collector 10 .

[0031] More specifically in this embodiment, the active material layer 20 is made of lithium iron phosphate, conductive carbon black, binder PVDF and solvent NMP uniformly mixed and coated on the current collector 10 .

[0032] In this embodim...

Embodiment 2

[0034] A method for preparing lithium-ion battery pole pieces, comprising the following steps

[0035] The first step is to mix the following four active materials lithium iron phosphate, conductive carbon black, binder PVDF and solvent NMP or the following three active materials lithium iron phosphate, conductive carbon black and binder PVDF to make active material slurry material;

[0036] In the second step, the active material slurry is coated on the current collector 10 by intermittent coating or uniform coating to form an active material layer 20, and dried and rolled at 120°C to a thickness specified by the process;

[0037] In the third step, the active material layer 20 formed by uniform coating in the second step is laser-melted to form the electrolyte infiltration channel 30 .

[0038] More specifically in this embodiment, the intermittent coating method can be realized by coating setup or 3D printing. The active material slurry used in the 3D printing is prepared...

Embodiment 3

[0040] See figure 1 , the first step, the active material lithium iron phosphate, conductive carbon black, binder PVDF and solvent NMP are evenly mixed to make a slurry;

[0041] In the second step, a coating machine is used to uniformly coat the active material slurry on the current collector 10 to form an active material layer 20;

[0042] The second step is to dry at 120° C. and roll the active material layer 20 of the pole piece to a thickness of 70 μm.

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Abstract

The invention relates to a lithium ion battery pole piece which comprises a current collector, an active substance layer coating the surface of the current collector and an electrolyte immersion channel distributed on the active substance layer, and the electrolyte immersion channel comprises at least one transverse infiltration channel and at least one longitudinal infiltration channel perpendicular to the transverse infiltration channel. The invention provides the lithium ion battery pole piece and a preparation method thereof, aiming at overcoming the defects that the manufacturing cost ofa battery is increased and the electrical property is reduced due to the fact that a high-compaction-density electrode piece is difficult to infiltrate in an electrolyte in the prior art.

Description

technical field [0001] The invention relates to the field of chemical power sources, in particular to a lithium-ion battery pole piece and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products, electric vehicles, energy storage and other fields due to their small size, light weight, long cycle life, and environmental friendliness. As people have higher and higher requirements for the standby time of electronic products and the cruising range of electric vehicles, the improvement of battery energy density has become a research topic for the entire industry. [0003] At present, the theoretical capacity of lithium iron phosphate materials in the industry is 172mAh / g, and the actual capacity is about 150mAh / g. In order to further improve the energy density of lithium iron phosphate batteries, lithium iron phosphate materials with high compacted density have been developed. However, high compacted densi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/136H01M4/139H01M4/1397H01M10/0525
CPCH01M4/13H01M4/136H01M4/139H01M4/1397H01M10/0525Y02E60/10
Inventor 孙全司晓影肖莹程传捷刘巍王富存
Owner JIANGSU FRONT NEW ENERGY
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