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A method for preparing silicon carbon negative electrode sheet by extrusion calendering and electrode sheet

A negative electrode, silicon carbon technology, applied in negative electrodes, electrode manufacturing, electrode extrusion, etc., can solve problems such as peeling and cracking, and achieve the effects of improving physical strength, reducing surface resistance, and improving strength

Active Publication Date: 2021-10-08
上海鲸孚科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for preparing a silicon-carbon negative electrode sheet by extrusion calendering, which is used to solve the problems of peeling and cracking of the silicon-carbon negative electrode sheet in the prior art , at the same time, the present invention will also provide a silicon carbon negative electrode sheet

Method used

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  • A method for preparing silicon carbon negative electrode sheet by extrusion calendering and electrode sheet
  • A method for preparing silicon carbon negative electrode sheet by extrusion calendering and electrode sheet
  • A method for preparing silicon carbon negative electrode sheet by extrusion calendering and electrode sheet

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Embodiment 1

[0046] A method for preparing a silicon carbon negative electrode sheet by extrusion calendering, comprising the steps of:

[0047] Step 1. Add PEDOT:PSS (the conductivity of PEDOT:PSS is 400s / cm), chloroplatinic acid, and dimethyl sulfoxide into the mixing device in order of 10, 2, and 10 parts by weight, and stir evenly. 100r / min, stirring time is 40min, the modified PEDOT:PSS slurry is obtained;

[0048] Step 2: Mix nano-silica powder, carbon fiber (the length of carbon fiber is 0.1-5 mm, and the diameter is 1-20 μm), sodium carboxymethyl cellulose, styrene-butadiene rubber emulsion with a mass concentration of 30%, and deionized water in parts by weight Add 10, 80, 1, 1, and 100 into the mixing device in turn, stir evenly, the stirring speed is 50r / min, and the stirring time is 6h, and the silicon powder / carbon fiber composite slurry is obtained;

[0049] Step 3. Add PEDOT:PSS slurry and silicon powder / carbon fiber composite slurry to the mixing device in order of 10 and ...

Embodiment 2

[0054] A method for preparing a silicon carbon negative electrode sheet by extrusion calendering, comprising the steps of:

[0055] Step 1. Add PEDOT:PSS (the conductivity of PEDOT:PSS is 400s / cm), chloroplatinic acid, and dimethyl sulfoxide into the mixing device in order of 20, 3, and 20 parts by weight, and stir evenly. 200r / min, stirring time is 20min, the modified PEDOT:PSS slurry is obtained;

[0056] Step 2: Mix nano-silica powder, carbon fiber (the length of carbon fiber is 0.1-5 mm, and the diameter is 1-20 μm), sodium carboxymethyl cellulose, styrene-butadiene rubber emulsion with a mass concentration of 30%, and deionized water in parts by weight Add 15, 95, 2, 2, and 180 into the mixing device in turn, stir evenly, the stirring speed is 100 / min, and the stirring time is 3 hours, and the silicon powder / carbon fiber composite slurry is obtained;

[0057] Step 3. Add PEDOT:PSS slurry and silicon powder / carbon fiber composite slurry to the mixing device in order of 15...

Embodiment 3

[0062] A method for preparing a silicon carbon negative electrode sheet by extrusion calendering, comprising the steps of:

[0063] Step 1. Add PEDOT:PSS (the conductivity of PEDOT:PSS is 400s / cm), chloroplatinic acid, and dimethyl sulfoxide into the mixing device in order of 13, 2.5, and 13 parts by weight, and stir evenly. 120r / min, stirring time is 40min, the modified PEDOT:PSS slurry is obtained;

[0064] Step 2: Mix nano-silica powder, carbon fiber (the length of carbon fiber is 0.1-5 mm, and the diameter is 1-20 μm), sodium carboxymethyl cellulose, styrene-butadiene rubber emulsion with a mass concentration of 30%, and deionized water in parts by weight Add 12, 84, 1.5, 1.5, and 120 into the mixing device in turn, stir evenly, the stirring speed is 80r / min, and the stirring time is 4h, and the silicon powder / carbon fiber composite slurry is obtained;

[0065] Step 3. Add PEDOT:PSS slurry and silicon powder / carbon fiber composite slurry to the mixing device in order of 1...

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Abstract

The present invention relates to the technical field of battery pole pieces, in particular to a method for preparing silicon-carbon negative electrode pieces by extrusion calendering, comprising: mixing PEDOT:PSS, chloroplatinic acid, and dimethyl sulfoxide to obtain modified PEDOT: PSS slurry; mix nano silicon powder, carbon fiber, sodium carboxymethyl cellulose, styrene-butadiene rubber emulsion with a mass concentration of 30%, and deionized water to obtain a silicon powder / carbon fiber composite slurry; PEDOT: PSS slurry Stir with silicon powder / carbon fiber composite slurry and extrude to obtain a paste; scrape and coat the paste to form a film. The invention solves the problem that the silicon-carbon negative electrode sheet is prone to peeling and cracking in the prior art. The above preparation method uses a flexible PEDOT:PSS film to replace the existing metal foil, and directly loads the negative electrode material on the pole piece, avoiding the problem of poor compatibility between the negative electrode active material and the pole piece in the traditional coating process. The procedure of the above preparation method is simple and controllable, and is suitable for large-scale and continuous production.

Description

technical field [0001] The invention relates to the technical field of battery pole pieces, in particular to a method for preparing a silicon-carbon negative electrode piece by extrusion calendering and the electrode piece. Background technique [0002] The negative electrode of the lithium-ion battery is formed by mixing the negative electrode active material carbon material or non-carbon material, binder and additives, and the paste is evenly applied on both sides of the copper foil, dried and rolled. Negative pole refers to the lower potential (potential) end of the power supply. In a primary battery, it refers to the electrode that oxidizes, and it is written on the left in the battery reaction. From a physical point of view, it is a pole from which electrons flow out of the circuit. The negative electrode material refers to the raw material that constitutes the negative electrode in the battery. At present, the common negative electrode materials include carbon negati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395H01M4/04H01M4/38H01M4/62H01M4/134H01M10/0525
CPCH01M4/0411H01M4/0435H01M4/134H01M4/1395H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 陈庆廖健淞司文彬李钧
Owner 上海鲸孚科技有限公司
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