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Composite conductive adhesive suitable for silicon-based negative electrode of lithium ion battery

A conductive adhesive, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of lack of electrical conductivity and low bonding strength

Inactive Publication Date: 2020-07-07
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a composite conductive adhesive with amphiphilic properties and a preparation method thereof, to solve the problem that the bonding strength of the adhesive for the silicon-based negative electrode in the prior art is not high, and the Technical issues with electrical conductivity
[0007] Another object of the present invention is to overcome the above-mentioned deficiencies of the prior art, and provide a lithium ion battery to solve the problems of existing lithium ion batteries, especially lithium ion batteries using silicon materials as negative electrodes, in terms of cycle stability, rate performance, capacity, etc. technical issues

Method used

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  • Composite conductive adhesive suitable for silicon-based negative electrode of lithium ion battery
  • Composite conductive adhesive suitable for silicon-based negative electrode of lithium ion battery
  • Composite conductive adhesive suitable for silicon-based negative electrode of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Add 10g of N-bromoacetanilide tetramer and 300ml of 7M hydrochloric acid into a three-necked flask, ultrasonicate for 20min, and mix well;

[0043] (2) Add 40g of 30wt% polyvinyl alcohol aqueous solution into a three-necked flask, stir at 300rpm for 1h, and stir evenly;

[0044] (3) Place the three-necked flask in a heating mantle and keep the temperature inside the flask at about 30°C;

[0045] (4) Slowly add 40g 15% bis(2-ethylhexyl) peroxydicarbonate solution in the there-necked flask, the rate of addition is 4 drops / second;

[0046] (5) Continue to maintain the temperature and stir for 20 hours to prepare a composite conductive adhesive of polyaniline / polyvinyl alcohol.

Embodiment 2

[0048] (1): Add 10g of bromoacetyl-substituted pyrrole tetramer and 300ml of 7M camphorsulfonic acid into a three-necked flask, ultrasonically for 20min, and mix well;

[0049] (2): Weigh 40g of 30wt% sodium carboxymethylcellulose aqueous solution, add it into a three-necked flask, stir at 300rpm for 1h, and stir evenly;

[0050] (3): Place the three-necked flask in a heating mantle and keep the temperature inside the flask at about 30°C;

[0051] (4): 30g of 11.11% potassium dichromate solution was slowly added to the three-necked flask, and the dropping rate was 4 drops / second;

[0052] (5): Continue to maintain the temperature and stir for 20 hours to prepare a composite conductive adhesive of polypyrrole / sodium carboxymethyl cellulose.

Embodiment 3

[0054] (1): Add 10g of bromoacetyl-substituted thiophene tetramer and 300ml of 7M dodecyl sulfonic acid into a three-necked flask, sonicate for 20min, and mix well;

[0055] (2): Weigh 40g of 30wt% polyacrylic acid aqueous solution, add it into a three-necked flask, stir at 300rpm for 1h, and stir evenly;

[0056] (3): Place the three-necked flask in a heating mantle and keep the temperature inside the flask at about 30°C;

[0057] (4): 30g of 11.11% potassium dichromate solution was slowly added to the three-necked flask, and the dropping rate was 4 drops / second;

[0058] (5): Continue to maintain the temperature and stir for 20 hours to prepare a composite conductive adhesive of polythiophene / polyacrylic acid.

[0059] Prepare the composite conductive binder prepared in the above three embodiments and the silicon carbon active material in a ratio of 6:94 to prepare a uniformly mixed slurry, and coat the uniformly mixed negative electrode slurry on the copper foil, And vacu...

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Abstract

The invention provides a conductive adhesive suitable for a silicon-based negative electrode of a lithium ion battery. The conductive adhesive disclosed by the invention is prepared by carrying out in-situ composite reaction on an amphiphilic conductive low polymer and an adhesive in an acidic medium. The composite conductive adhesive provided by the invention has high adhesion and conductivity, can effectively improve the energy density and reduce the volume variability of the silicon-based negative electrode in the charging and discharging process, and effectively improves the cycle stability and rate capability of the lithium ion battery. The preparation method is simple in process, conditions are easy to control, the prepared conductive adhesive is stable in performance and high in production efficiency, and the production cost is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a composite conductive binder with amphiphilic properties, a preparation method thereof, a negative electrode containing the same, and a battery including the negative electrode. Background technique [0002] With the increasing attention to environmental protection in contemporary society, the electric vehicle industry driven by electricity has developed rapidly in recent years. The power battery industry has an increasingly urgent demand for high-performance lithium-ion batteries with high capacity, long life, high rate performance and safety. As far as the current level of science and technology is concerned, the development of large-capacity, high-performance lithium-ion power batteries requires the use of silicon-based active materials as the negative electrode material of lithium-ion batteries. Therefore, more and more attention is focused on the rese...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/134H01M10/0525
CPCH01M4/134H01M4/621H01M10/0525Y02E60/10
Inventor 刘建红王兴勤吴路路韩徐年王思懿彭婷
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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