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A kind of preparation method of pole piece for supercapacitor

A technology for supercapacitors and pole pieces is applied in the field of preparation of pole pieces for supercapacitors, which can solve the problems of large internal resistance, insufficient contact and low bulk density of the electrode pieces.

Active Publication Date: 2017-01-25
LIAONING BROTHER ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that the contact between the active material and the conductive agent and the contact between the active material and the active material are insufficient during the preparation process, resulting in large internal resistance of the electrode sheet, low bulk density, and the ratio of the electrode per unit volume. low capacity

Method used

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  • A kind of preparation method of pole piece for supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Conductive material gelation

[0031] Mix conductive carbon black and polytetrafluoroethylene evenly according to the mass ratio of 1:1 to obtain a gelled conductive material;

[0032] (2) Make large particles

[0033] Graphene is added to the gelled conductive material and crushed into large particles of electrode material with a particle size of 0.1 mm to 10 mm, and the mass ratio of the conductive carbon black to graphene is 1:1;

[0034] (3) kneading

[0035] Knead the large particles of the electrode material into an elastic jelly of the electrode material with a planetary mixer;

[0036] (4) pulping

[0037] The electrode material elastic jelly is added to water, and stirred to form an electrode material slurry with a solid content (the quality of the electrode material elastic jelly) of 30wt%;

[0038] (5) coating

[0039] Coating the electrode material slurry on the current collector to produce an untreated pole piece;

[0040] (6) Hot pressing

[004...

Embodiment 2

[0043] (1) Conductive material gelation

[0044] Mix acetylene black and styrene-butadiene rubber evenly according to the mass ratio of 3:1 to obtain a gelled conductive material;

[0045] (2) Make large particles

[0046] Activated carbon is added to the gelled conductive material and crushed into large particles of electrode material with a particle size of 0.1 mm to 10 mm, and the mass ratio of acetylene black to activated carbon is 1:10;

[0047] (3) kneading

[0048] Knead the large particles of the electrode material into an elastic colloid of the electrode material with a ball mill;

[0049] (4) pulping

[0050] Add the electrode material elastic colloid into water, and stir to form an electrode material slurry with a solid content of 40wt%;

[0051] (5) coating

[0052] Coating the electrode material slurry on the current collector to produce an untreated pole piece;

[0053] (6) Hot pressing

[0054] Hot press the untreated pole piece at 240°C. During hot press...

Embodiment 3

[0056] (1) Conductive material gelation

[0057] Mix carbon fiber and polypropylene evenly according to the mass ratio of 5:1 to obtain a gelled conductive material;

[0058] (2) Make large particles

[0059] Adding carbon nanotubes to the gelled conductive material and crushing them into large particles of electrode material with a particle size of 0.1 mm to 10 mm, the mass ratio of the carbon fibers to the carbon nanotubes is 1:5;

[0060] (3) kneading

[0061] Knead the large particles of the electrode material with a high-speed mixer to form an elastic gel of the electrode material;

[0062] (4) pulping

[0063] The electrode material elastic gel is added to water, and stirred to form an electrode material slurry with a solid content of 35wt%;

[0064] (5) coating

[0065] Coating the electrode material slurry on the current collector to produce an untreated pole piece;

[0066] (6) Hot pressing

[0067] Hot-press the untreated pole piece at 150°C. When hot-pressing...

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Abstract

The invention discloses a method for manufacturing electrode pieces for supercapacitors. The method includes the steps that conductive materials and binder are evenly mixed so that gelatinized conductive materials can be obtained, active substances are added into the gelatinized conductive materials, the gelatinized conductive materials with the active substances are smashed into large particles of electrode materials, the large particles of the electrode materials are kneaded to form elastic electrode material colloid, water is added into the elastic electrode material colloid, the water and the elastic electrode material colloid are stirred to form electrode material slurry, a current collector is coated with the electrode material slurry, the electrode material slurry is compacted on the current collector through thermal compression, and finished electrode pieces with the bulk density ranging from 0.62 g / cm<3> to 0.75 g / cm<3> are obtained. The method has the advantages that consumption of the conductive materials can be reduced, the dispersibility of the conductive materials and the adhesiveness between the conductive materials and the active materials are improved, internal resistance of electrodes is effectively reduced, the bulk density of the electrode pieces is increased, and the volumetric specific energy of the supercapacitors manufactured with the electrode pieces is increased.

Description

technical field [0001] The invention relates to a preparation method of pole pieces for supercapacitors. Background technique [0002] As a new energy storage device, supercapacitors are widely used in smart meters, electric power, medical care, solar wind energy, toys, etc. , new energy vehicles and other fields are widely used. [0003] Supercapacitors are structurally divided into button type and winding type, and the electrode sheet of winding type supercapacitor mainly includes active material and current collector. [0004] The existing preparation method of the electrode sheet of the wound supercapacitor is mainly based on the coating method, that is, the active material and the conductive agent are mixed first, and then the binder and water are added, stirred into a slurry, and coated on the current collector. The problem with this method is that the contact between the active material and the conductive agent and the contact between the active material and the act...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86
CPCY02E60/13
Inventor 李兵吴秋菊姚建勋武智惠蔡丹
Owner LIAONING BROTHER ELECTRONICS TECH CO LTD