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Preparation method of fiber diaphragm and pole piece

A fiber membrane and cathode material technology, applied in electrode manufacturing, electrode rolling/calendering, flat products, etc., can solve the problems of high technical difficulty, easy plugging holes, broken wires, etc., to improve energy density and safety. , The pole piece density is uniform and the effect of good adaptability

Active Publication Date: 2022-06-07
隋奚禹 +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second point is that the process of spraying into wires of several microns to tens of microns is prone to problems such as hole plugging and broken wires, and the process is technically difficult

Method used

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  • Preparation method of fiber diaphragm and pole piece
  • Preparation method of fiber diaphragm and pole piece
  • Preparation method of fiber diaphragm and pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A kind of fiber diaphragm of ternary 622 positive electrode, its raw material composition is as follows:

[0051] Dispersed PTFE powder (particle size between 300μm-450μm, molecular weight greater than 1 million) 15g, conductive carbon black SP 10g, super conductive carbon black EC 10g and positive electrode 622 type nickel-cobalt-manganese ternary battery material 965g;

[0052] Its preparation method steps are as follows:

[0053] Step 1. Put the dispersed polytetrafluoroethylene powder, conductive carbon black SP, super conductive carbon black EC and 622 type nickel-cobalt-manganese ternary battery material in a two-way mixer to stir and mix to obtain a mixture in which the raw materials are uniformly dispersed. ; In order to prevent material segregation, the stirring speed of the present embodiment is set to 35r / min, and the stirring time is 180min;

[0054] Step 2. Put the mixture obtained in step 1 into a dough mixer, add 260g of ethylene glycol as a solvent to t...

Embodiment 2

[0058] A fibrous membrane of negative mesophase carbon microspheres, the raw material composition of which is as follows:

[0059] Dispersed PTFE powder (particle size between 300μm-450μm, molecular weight greater than 1 million) 10g, conductive graphite KS-6 30g, carbon nanotube CNTs 10g and negative electrode mesophase carbon microsphere battery material 950g;

[0060] The specific preparation method steps are as follows:

[0061] Step 1, placing the dispersed polytetrafluoroethylene powder, conductive graphite KS-6, carbon nanotubes CNTs and negative electrode mesophase carbon microsphere battery material in a two-way mixer, stirring and mixing, to obtain a mixture in which the raw materials are uniformly dispersed with each other; In order to prevent material segregation, in this example, the stirring speed was set to 45 r / min, and the stirring time was 240 min.

[0062] Step 2. Put the mixture obtained in step 1 into a dough mixer, add 350g of ethylene glycol as a solven...

Embodiment 3

[0066] Utilize the positive and negative electrode fiber membranes prepared in Examples 1 and 2 to prepare pole pieces, and the specific steps are as follows:

[0067] First coat the conductive slurry on both sides of the current collector, and then stick the fiber membrane on both sides of the current collector and press it by a rolling mill, dry it, and then roll it to obtain the polar structure of the fiber structure. piece;

[0068] The compaction density of the fiber membranes attached to both sides of the current collector, the positive electrode is 3.4g / cm 3 ; negative electrode is 1.5g / cm 3 ; The thickness of the fiber membranes attached to both sides of the current collector, the single-sided positive electrode is 140 μm, and the single-sided surface density is 47.6 mg / cm 2 ; The single-sided negative electrode is 160 μm, and the single-sided density is 24 mg / cm 2 ; Then make a soft pack battery for electrical performance test.

[0069] In addition, the wet coatin...

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Abstract

The embodiment of the present invention discloses a preparation method of a fiber membrane and a pole piece. The preparation method of the fiber membrane includes: step 1: dry mixing polytetrafluoroethylene, a conductive agent, and an active material through a two-way mixer to Uniform; Step 2: Add the mixed powder in Step 1 to the shearing and stirring equipment, add an appropriate amount of solvent, and the amount of solvent is 5%-45% of the total weight of the solvent plus other components; shearing and stirring Obtain a dough-like mixture; step 3: transport the dough-like mixture into a two-speed rolling mill through a screw extrusion device for rolling to obtain a membrane, remove the solvent from the membrane, and obtain a fiber membrane after removing the solvent . The fiber diaphragm of the present invention has good flexibility and impact resistance, greatly reduces the internal resistance of the electrode pole piece, and can effectively improve the energy density and safety of the lithium ion battery; the pole piece material prepared by the present invention does not Brittle, uniform pole piece density and better adaptability.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a preparation method of a fiber membrane and a pole piece. Background technique [0002] At present, the method of making the pole pieces of lithium-ion batteries and super capacitors is mainly the coating method: specifically, the conductive agent, active material, and adhesive are mixed into a slurry, and the slurry is coated on the conductive current collector (metal Foil), dry it, then increase its compaction density by rolling, cut it into a certain size, assemble it with the separator by winding or lamination, and inject electrolyte to form a battery. [0003] The pole piece made by this method is very hard in texture and belongs to a rigid structure, and the active material is very easy to fall off from the current collector under the impact of external force; due to the influence of the adhesive, the coating should not be very thick, otherwise it will increase The resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/139H01M10/0525B29C48/00B29C69/02
CPCH01M4/0435H01M4/0404H01M4/139H01M10/0525B29C48/0011B29C69/02B29L2007/002Y02E60/10
Inventor 许兆欣
Owner 隋奚禹
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