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A sandwich structure electrode

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

Active Publication Date: 2022-07-19
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
Comparison scheme
Effect test

Embodiment 1

[0056] The electrode composition of lithium iron phosphate:SP:KS-6:PVDF=85:5:5:5 (wt.%) was mixed with NMP in a planetary mixer to form 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 to form a uniform electrode slurry B with a solid content of 49%; Lithium iron phosphate: The electrode composition of SP:CNT:PVDF=93:2:2:3 (wt.%) was mixed with NMP to form a uniform electrode paste C with a solid content of 47%.

[0057] The slurry A was uniformly coated with 12 μm on the surface 1 of 15 μm aluminum foil with a blade coater, vacuum-dried at 150 ° C for 3 hours, and subjected to rolling treatment to obtain an electrode bottom layer 2 with a coating thickness of 10 μm, and the porosity was 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, vacuum dried at 150 ° C for 10 hours, and then rolled...

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.%) was mixed with NMP to form a uniform electrode slurry A with a solid content of 49%. The electrode composition of lithium iron phosphate:SP:KS-6:PVDF:ammonium bicarbonate=94:1:2:2:1 (wt.%) was mixed with NMP to form a uniform electrode slurry B with a solid content of 49%.

[0063] The slurry B was uniformly coated on the surface 1 of aluminum foil with a thickness of 15 μm by a doctor blade coater, and then vacuum-dried at 150 ° C for 3 hours to obtain an electrode bottom layer 2 with a coating thickness of about 40 μm; Thickness of slurry A, and then vacuum-dried at 120 ° C for 5 hours to obtain an electrode coated with the bottom layer and electrode intermediate layer 3, with a thickness of about 80 μm; Similarly, the surface of the dried electrode intermediate layer 3 was coated with slurry B of the same thickness , vacuum-drying at 150 °C for 3 hours to obtai...

Embodiment 3

[0066] The electrode composition of lithium iron phosphate:SP:KS-6:PVDF=94:1.5:2:2.5 (wt.%) was mixed with NMP in a planetary mixer to form 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.%) was mixed with NMP to form a uniform electrode slurry with a solid content of 49% Material B; the electrode composition of lithium iron phosphate: SP: KS-6: PVDF: ammonium bicarbonate = 93:1:2:2:2 (wt.%) was mixed with NMP to form a uniform electrode with a solid content of 49% Slurry C.

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

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Abstract

The present invention provides an electrode with a sandwich structure, comprising a current collector and an electrode composition deposited on the current collector in the form of a sandwich structure, the electrode composition including positive / negative electrode active materials, a binder and a conductive agent, the interlayer The structure consists of an electrode bottom layer close to the current collector and an electrode surface layer far from the current collector, and an electrode intermediate layer sandwiched between the electrode bottom layer and the electrode surface layer. Both ends gradually increase. In the invention, each coating layer with different porosity within the thickness range is used to form a sandwich structure electrode, and the electrode bottom layer with higher porosity ensures the electrolyte holding ability of the electrode close to the current collector side, which is beneficial to improve the cycle performance of the thick electrode and increase the number of electrodes. The porosity of the surface layer can improve the wetting ability of the electrolyte to the whole electrode, while the porosity of the middle layer of the electrode is lower, which ensures that the electrode has a good energy density as a whole.

Description

technical field [0001] The invention belongs to the technical field of large-capacity electrical 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 also further benchmarking against traditional fuel vehicles, making the requirements for the cruising range of a single vehicle higher and higher. At the same time, the subsidy policy also promotes the energy density of new energy vehicle power batteries. rise. [0003] At present, all countries regard the development of power batteries with high energy density as a technological breakthrough 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 300W...

Claims

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Application Information

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Patent Type & Authority Patents(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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