Sandwich structure electrode

A sandwich structure and electrode technology, applied in the field of large-capacity storage devices, can solve the problems of unfavorable electrolyte infiltration, rapid electrolyte consumption, etc.

Active Publication Date: 2020-06-23
国科能源(滁州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the increase in the thickness of the existing electrode structure has brought negative effects on the performance of the battery, for example, it is not conducive to the infiltration of the electrolyte, and the electrolyte is consumed faster near the current collector. A new type of electrode is provided. multilayer electrode

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0056] In the planetary mixer, the electrode composition of lithium iron phosphate: SP: KS-6: PVDF=85:5:5:5 (wt.%) and NMP are mixed into a uniform electrode slurry with a solid content of 41%. A; the electrode composition of lithium iron phosphate: CNT:SP:PVDF=95:1:2:2 (wt.%) is mixed with NMP into a uniform electrode slurry B with a solid content of 49%; the lithium iron phosphate: An electrode composition of SP:CNT:PVDF=93:2:2:3 (wt.%) was mixed with NMP to form a uniform electrode slurry C with a solid content of 47%.

[0057] Use a doctor blade coater to evenly coat the slurry A on the surface 1 of 15 μm aluminum foil with a thickness of 12 μm, dry it in vacuum at 150°C for 3 hours, and roll it to obtain an electrode bottom layer 2 with a coating thickness of 10 μm and a porosity of about 40%;

[0058] Then, the slurry B was uniformly coated on the surface of the electrode bottom layer 2 with a thickness of 60 μm, dried in vacuum at 150°C for 10 hours, and then rolled to ...

Embodiment 2

[0062] In a high-speed mixer, the electrode composition of lithium iron phosphate: SP: KS-6: PVDF=94:1.5:2:2.5 (wt.%) is mixed with NMP into a uniform electrode slurry A with a solid content of 49%. Lithium iron phosphate: SP: KS-6: PVDF: ammonium bicarbonate = 94:1:2:2:1 (wt.%) The electrode composition is mixed with NMP to form a uniform electrode slurry B with a solid content of 49%.

[0063] Use a knife coater to evenly coat slurry B on the surface 1 of 15 μm aluminum foil, and then vacuum-dry it at 150°C for 3 hours to prepare electrode bottom layer 2 with a coating thickness of about 40 μm; then coat the dried bottom layer surface with the same thick slurry A, and then vacuum-dried at 120°C for 5 hours to obtain an electrode coated with the bottom layer and the electrode intermediate layer 3, with a thickness of about 80 μm; similarly, the same thickness of slurry B was coated on the surface of the dried electrode intermediate layer 3 , dried in vacuum at 150°C for 3 hou...

Embodiment 3

[0066] In the planetary mixer, the electrode composition of lithium iron phosphate: SP: KS-6: PVDF=94:1.5:2:2.5 (wt.%) is mixed with NMP into a uniform electrode slurry with a solid content of 49%. A; the electrode composition of lithium iron phosphate: SP: KS-6: PVDF: ammonium bicarbonate=94:1:2:2:1 (wt.%) is mixed with NMP into a uniform electrode slurry with a solid content of 49% Material B; lithium iron phosphate: SP: KS-6: PVDF: ammonium bicarbonate = 93:1:2:2:2 (wt.%) electrode composition and NMP are mixed into a uniform electrode with a solid content of 49% Slurry C.

[0067] Use a knife coater to evenly coat slurry B on the surface of 15 μm aluminum foil, and then dry it in vacuum at 150°C for 3 hours to prepare the electrode bottom layer 2 with a coating thickness of about 40 μm; then coat the dried electrode bottom layer 2 with Slurry A of the same thickness was then vacuum-dried at 120°C for 5 hours to obtain an electrode coated with the electrode bottom layer 2 ...

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Abstract

The invention provides a sandwich structure electrode. The sandwich structure electrode comprises a current collector and an electrode composition deposited on the current collector in a sandwich structure form, and the electrode composition comprises a positive / negative electrode active material, a binder and a conductive agent; the sandwich structure is composed of an electrode bottom layer close to the current collector, an electrode surface layer away from the current collector and an electrode middle layer clamped between the electrode bottom layer and the electrode surface layer; and theporosity is gradually increased from the electrode middle layer to the two ends of the electrode bottom layer and the two ends of the electrode surface layer respectively. According to the invention,the coatings with different porosities in the thickness range are utilized to form the sandwich structure electrode, the electrode bottom layer with high porosity guarantees the electrolyte retentioncapacity of the electrode close to the current collector side, the cycle performance of the thick electrode is improved, the infiltration capacity of the electrolyte to the whole electrode can be improved by increasing the porosity of the electrode surface layer, the porosity of the electrode middle layer is low, and it is guaranteed that the whole electrode has good energy density.

Description

technical field [0001] The invention belongs to the technical field of large-capacity electric storage devices, and relates to an electrode with a sandwich structure, which can be applied to lithium-ion batteries, supercapacitors and fuel cells with high energy density and high power. Background technique [0002] With the increase in the number of new energy vehicles, users' requirements for new energy vehicles are further benchmarked against traditional fuel vehicles, making the requirements for the mileage of single vehicles higher and higher. At the same time, subsidy policies are also promoting the energy density of new energy vehicle power batteries. raised. [0003] At present, all countries regard the development of power batteries with high energy density as a technological breakthrough point in the field of electric vehicles. The development route of power batteries for new energy vehicles in my country is planned to achieve a specific energy of more than 300Wh / kg ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M4/36H01M4/86H01M4/88H01G11/28
CPCH01M4/136H01M4/1397H01M4/366H01M4/8657H01M4/88H01G11/28Y02E60/50
Inventor 杨续来徐瑞
Owner 国科能源(滁州)有限公司
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