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Preparation method of electrode sheet

A technology of electrode sheet and electrode slurry, which is applied in the field of capacitors and can solve problems such as crushing and crushing of electrode materials

Active Publication Date: 2018-07-06
GUANGDONG FENGHUA ADVANCED TECH HLDG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Before the electrode material is combined with the pole piece, it is necessary to perform a rolling film forming and a second rolling film forming operation with the electrode material, which is easy to cause crushing and injury to the electrode material

Method used

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  • Preparation method of electrode sheet

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preparation example Construction

[0020] The preparation method of the electrode sheet will be further described in detail mainly in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown, the method for preparing an electrode sheet according to one embodiment includes the following steps S110-S130.

[0022] S110, mixing the electrode material, the conductive agent, the binder and the solvent to obtain an electrode slurry.

[0023] Mix the electrode material, conductive agent, binder and solvent to obtain the electrode slurry. The form of the slurry can conveniently adjust the proportion of each component and adjust the solid content, etc., which is convenient for the subsequent spray granulation operation.

[0024] Specifically, the electrode material may be at least one of activated carbon, graphene, carbon nanotubes, manganese dioxide and lithium titanate.

[0025] In this embodiment, the electrode material is activated carbon. Activated carbon has a large specific surface area an...

Embodiment 1

[0065] (1) Preparation of electrode slurry, the ratio by weight is electrode material (activated carbon): conductive agent (ketjen black): binder = 92 parts: 6 parts: 2 parts for batching. Wherein, the binder is SBR and CMC with a weight ratio of 75 parts: 25 parts. The solid content of the slurry was adjusted to 20% by adding deionized water, and dispersed in a vacuum planetary mixer for 4 hours, and the viscosity of the slurry was tested at a room temperature of 25° C. to be 1500 mpa.s.

[0066] (2) Import the above slurry into a spray dryer, adjust the inlet air temperature to 220°C, the outlet air temperature to 100°C, and the atomization speed to 25,000 revolutions per minute (r.p.m). The electrode slurry is sprayed and granulated to form a spherical shape The particles (composite carbon spheres) had an average particle diameter of 50 μm.

[0067] (3) Add spherical particles into the feeding bin of the spraying machine, adopt multi-nozzle parallel mode, use corroded alum...

Embodiment 2

[0071] (1) Preparation of electrode slurry, the ratio in parts by weight is electrode material (activated carbon): conductive agent (ketjen black): binder = 80 parts: 10 parts: 10 parts for batching. Wherein, the binder is SBR and CMC with a ratio of 50 parts by weight: 50 parts. And the solid content of the slurry was adjusted to 10% by adding deionized water, and dispersed in a vacuum planetary mixer for 4 hours, and the viscosity of the slurry was tested at a room temperature of 25° C. to be 500 mpa.s.

[0072](2) Import the above slurry into a spray dryer, adjust the air inlet temperature to 200°C, the outlet air temperature to 100°C, and the atomization speed to 25,000 revolutions per minute (r.p.m). The electrode slurry is sprayed and granulated to form a spherical shape The particles (composite carbon spheres) had an average particle diameter of 50 μm.

[0073] (3) Add spherical particles into the feeding bin of the spraying machine, adopt multi-nozzle parallel mode, u...

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Abstract

The invention discloses a preparation method of an electrode sheet. First, the electrode material, a conductive agent, a binder and a solvent are mixed to obtain an electrode slurry, and then the electrode slurry is centrifugally atomized to form liquid droplets. During the process, hot air is passed through to dry the liquid droplets, so as to realize spray granulation of the electrode slurry, and obtain spherical particles with a particle size of 30 μm to 60 μm. Afterwards, the spherical particles are sprayed onto the current collector under the conditions of a gas pressure of 2 MPa to 6 MPa and a gas temperature of 100° C. to 150° C. to obtain an electrode sheet. This method combines spray granulation and low-pressure cold spraying, and does not require the electrode material to be rolled into a film and rolled into a film for the second time, so it is not easy to crush and damage the electrode material.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a method for preparing electrode sheets. Background technique [0002] Electrode production technology is the core technology of supercapacitors, and the quality of electrodes directly affects the performance of supercapacitors. The method of dry lamination of pole pieces is one of the advanced technologies for supercapacitor manufacturing. This technology is a dry lamination process developed by Maxwell Corporation of the United States and Gore Corporation of Japan with polytetrafluoroethylene (PTFE) as a binder. . Compared with the wet coating method, the amount of binder can be effectively reduced, and the density of the active material layer can be increased, so that the capacity of the electrode sheet can also be increased by 10% to 20%. [0003] However, the method of manufacturing supercapacitor pole pieces by Maxwell’s dry method generally needs to go through weighin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86
CPCY02E60/13
Inventor 朱归胜付振晓徐华蕊许积文于圣明沓世我苏红娟李梅
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG