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Preparation method of fiber diaphragm and pole piece

A fiber membrane and negative electrode material technology, applied in electrode manufacturing, electrode rolling/calendering, battery electrodes, etc., can solve problems such as hole plugging, wire breakage, and technical difficulty, and improve energy density and safety. , good adaptability, the effect of reducing internal resistance

Active Publication Date: 2022-01-21
SHENZHEN GENERAL MEASURE TECH
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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 pole, its raw material composition is specifically as follows:

[0051] Dispersed polytetrafluoroethylene powder (particle size between 300um-450um, 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 dispersed polytetrafluoroethylene powder, conductive carbon black SP, super conductive carbon black EC and 622-type nickel-cobalt-manganese ternary battery materials in a two-way mixer and mix them to obtain a mixture in which the raw materials are uniformly dispersed with each other ; 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 kneading machine, add ...

Embodiment 2

[0058] A fiber membrane of negative electrode mesocarbon microspheres, the raw material composition is as follows:

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

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

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

[0062] Step 2. Put the mixture obtained in Step 1 into a kneading machine, add 350g of ethylene glycol as a solvent to th...

Embodiment 3

[0066] Utilize the positive and negative electrode fiber diaphragms that embodiment 1 and 2 prepare to prepare pole piece, concrete steps are as follows:

[0067] First, the conductive slurry is coated on both sides of the current collector, and then the fiber membrane is applied to both sides of the current collector and pressed by a rolling mill, dried, and then rolled to obtain a pole with a fiber structure. piece;

[0068] The compacted density of the fiber membrane applied on both sides of the current collector is 3.4g / cm2 at the positive pole. 3 ; Negative electrode 1.5g / cm 3 ; The thickness of the fiber membrane applied on both sides of the current collector, the positive pole on one side is 140um, and the density on one side is 47.6mg / cm 2 ;Single-side negative electrode is 160um, single-side surface density is 24mg / cm 2 ; Then made into a pouch battery for electrical performance testing.

[0069] In addition, the wet coating process was used to produce pole pieces...

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Abstract

The embodiment of the invention discloses a preparation method of a fiber diaphragm and a pole piece. The preparation method of the fiber diaphragm comprises the following steps: step 1, uniformly mixing polytetrafluoroethylene, a conductive agent and an active substance through a two-way stirrer by a dry method; 2, adding the powder mixed in the step 1 into shearing and stirring equipment, adding a proper amount of solvent, wherein the use amount of the solvent is 5%-45% of the total weight of the solvent and other components and shearing and stirring to obtain a dough-shaped mixture; and 3, conveying the dough-shaped mixture into a double-speed rolling mill through screw extrusion equipment for rolling to obtain a diaphragm , and removing a solvent from the diaphragm to obtain the fiber diaphragm after the solvent is removed. The fiber diaphragm disclosed by the invention has good bendability and impact resistance, the internal resistance of the electrode plate is greatly reduced, and the energy density and the safety of the lithium ion battery can be effectively improved; and the pole piece material prepared by the invention is not brittle, the density of the pole piece is uniform and consistent, and the pole piece has better adaptability.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a method for preparing a fiber membrane and a pole piece. Background technique [0002] At present, the manufacturing method of lithium-ion batteries and supercapacitors 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 current collector (metal Foil), which is dried and then rolled to increase its compaction density, cut into a certain size, assembled with a separator by winding or lamination, and injected with electrolyte to form a battery. [0003] The pole piece made by this method is very hard and has a rigid structure. The active material is 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 resistance of the pole piece deteriorates the pe...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/139H01M10/0525B29C48/00B29C69/02
CPCH01M4/0435H01M4/0404H01M4/139H01M10/0525B29C48/0011B29C69/02B29L2007/002Y02E60/10
Inventor 许兆欣
Owner SHENZHEN GENERAL MEASURE TECH
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