Preparation method of lithium-sulfur battery positive electrode aqueous conductive binder

A conductive binder and lithium-sulfur battery technology, which is applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of low adhesion and low conductivity of sulfur positive electrodes, and achieve simple equipment and high output High efficiency and improved mechanical strength

Active Publication Date: 2021-02-19
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low adhesion and low conductivity of the sulfur positive electrode on the current collector, and provide a conductive binder for high-load lithium-sulfur batteries and its preparation method

Method used

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  • Preparation method of lithium-sulfur battery positive electrode aqueous conductive binder
  • Preparation method of lithium-sulfur battery positive electrode aqueous conductive binder
  • Preparation method of lithium-sulfur battery positive electrode aqueous conductive binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Dissolve 5.04g of carboxymethylcellulose in 1675ml of deionized water and stir in a water bath at 60°C to form a solution;

[0044] (2) Dissolve 7 g of multi-walled carbon nanotube powder in 140 g of the solution prepared in step 1 by emulsifying and shearing for 60 min, and ultrasonically disperse for 20 min with a cell disruptor;

[0045] (3) In the air, 45g acetylene black and 15g expanded graphite and 400g solid content are 15% LA133 aqueous binding agent (acrylonitrile multiple copolymer) to pack in the feed tank, then pour into 1540g step 1 prepared The solution was used as a solvent, mechanically sanded at 750rpm for 1h, figure 2 Shown is the scanning electron micrograph of the prepared graphene conductive paste;

[0046](4) Take 400 g of the slurry obtained in step 3, add the carbon nanotube dispersion obtained in step 2 and 1 g of vapor-phase grown carbon fiber, and perform mechanical stirring treatment at 800 rpm for 2 h. Finally, 53 g of LA133 water-ba...

Embodiment 2

[0049] (1) Dissolve 0.216g of carboxymethylcellulose in 72ml of deionized water and stir in a water bath at 60°C to form a solution;

[0050] (2) Dissolve 1.75 g of multi-walled carbon tube powder in 35 g of the solution prepared in step 1 by mechanical stirring for 4 h, and ultrasonically disperse for 20 min with a cell disruptor;

[0051] (3) in the air, 2.25g acetylene black and 0.75g expanded graphite and 20g solid content are 15% LA133 water-based binding agent to pack in the ball mill jar, then pour into the prepared solution of 37g step 1 as solvent, in Mechanical ball milling under 350rpm rotating speed 4h; Wherein the used zirconia ball milling bead small bead (diameter is 3mm) and big bead (diameter is 8mm) are mixed according to the mass ratio of 1:5;

[0052] (4) Add the carbon nanotube dispersion obtained in step 2 and 0.25 g of vapor-phase grown carbon fibers to the slurry obtained in step 3, and perform mechanical stirring treatment at 800 rpm for 2 h. Finally,...

Embodiment 3

[0056] (1) Dissolve 0.156g of carboxymethylcellulose in 52ml of deionized water and stir in a water bath at 60°C to form a solution;

[0057] (2) Dissolve 0.75 g of multi-walled carbon tube powder in 15 g of the solution prepared in step 1 by mechanical stirring for 4 h, and ultrasonically disperse for 20 min with a cell disruptor;

[0058] (3) in the air, 2.25g acetylene black and 0.75g expanded graphite and 20g solid content are 15% LA133 water-based binding agent to pack in the ball mill jar, then pour into the prepared solution of 37g step 1 as solvent, in Mechanical ball milling at 350rpm for 4 hours;

[0059] (4) Add the carbon nanotube dispersion obtained in step 2 to the slurry obtained in step 3, and perform mechanical stirring treatment at 800 rpm for 2 hours. Finally, 5 g of LA133 water-based binder with a solid content of 15% was added and mechanically stirred at 1000 rpm for 6 hours to prepare a water-based composite conductive binder. The carbon material mass r...

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Abstract

The invention discloses a lithium-sulfur battery positive electrode aqueous conductive binder and a preparation method thereof, the conductive binder raw material comprises a carbon material and a binding polymer, the mass ratio of the carbon material to the binding polymer is 0.9-1.1:0.9-1.1, the carbon material comprises zero-dimensional carbon, one-dimensional carbon and two-dimensional carbon,and the mass ratio of the zero-dimensional carbon to the one-dimensional carbon to the two-dimensional carbon is 3-9:1-8:1-3. The method is suitable for various binders of the lithium-sulfur battery,and has good universality.

Description

technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery cathode water-based conductive binder. Background technique [0002] With elemental sulfur (theoretical specific capacity 1675mAh·g -1 ) The theoretical specific energy density of the lithium-sulfur battery as the cathode material is as high as 2600Wh·kg -1 , and has the advantages of environmental friendliness, low price and cost, and abundant reserves. Therefore, lithium-sulfur batteries are considered to be a next-generation high-energy-density secondary battery system with great development potential. [0003] However, elemental sulfur and its discharge product lithium polysulfide have poor conductivity, which seriously affects the conduction of electrons, thereby reducing the utilization of active materials and resulting in a low actual energy density of lithium-sulfur batteries. Secondly, due to the elemental sulfur (2.03g·cm -3 ) and the discharge product lithium sulfi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052
CPCH01M4/625H01M4/622H01M10/052Y02E60/10
Inventor 方晓亮乔昕郭葆福曾彦汝
Owner XIAMEN UNIV
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