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Adhesive for lithium ion batteries and preparation method of adhesive for lithium ion batteries

A lithium-ion battery and adhesive technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of large environmental pollution, poor electrical conductivity, and poor mechanical properties of the adhesive, and achieve good toughness and good performance. The effect of application performance

Active Publication Date: 2016-07-27
JIANGSU SHENSU ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PVDF binder is a relatively mature binder in technology and has good bonding performance, but the use of this binder to prepare electrode sheets needs to consume a large amount of N-methylpyrrolidone (NMP) with a higher boiling point. ) organic solvent, high cost, great environmental pollution, and PVDF binder is easy to swell in some commonly used electrolytes, resulting in a decrease in electrode stability
CMC and SBR binders are usually used together. This kind of binder often uses water as a solvent, which is low in cost, environmentally friendly and widely used. However, this kind of binder has poor mechanical properties and poor electrical conductivity.
Especially, for some high-capacity electrode materials (such as silicon, tin dioxide anode, etc.) that have significant volume changes during charge-discharge cycles, these commonly used binders cannot meet the actual needs.

Method used

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  • Adhesive for lithium ion batteries and preparation method of adhesive for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] An adhesive for lithium-ion batteries, the components include in parts by weight: 5 parts of ethyl cyanoacrylate, 2 parts of cyanoethylethylenediamine, 1 part of citric acid, 1 part of polyethyleneimine, modified 15 parts of permanent polyacrylate mixture, 1 part of titanate coupling agent, 0.5 part of ammonium persulfate initiator.

[0018] In the above components, the preparation method of the modified polyacrylate mixture is as follows:

[0019] Add 20 parts by weight of polyacrylate, 2 parts of polyvinyl alcohol, and 3 parts of dimethyl diallyl ammonium chloride into the reaction kettle for mixing. The mixing temperature is 80°C and the mixing time is 10 minutes. , to obtain a modified polyacrylate mixture.

[0020] The preparation method of the binder for the above lithium ion battery, the steps are as follows:

[0021] Step 1, taking each component according to parts by weight;

[0022] Step 2: Add ethyl 2-cyanoacrylate, cyanoethylethylenediamine, citric acid, ...

Embodiment 2

[0024] An adhesive for lithium-ion batteries, the components include in parts by weight: 6 parts of ethyl cyanoacrylate, 4 parts of cyanoethylethylenediamine, 2 parts of citric acid, 1 part of polyethyleneimine, modified 17 parts of permanent polyacrylate mixture, 2 parts of titanate coupling agent, 0.6 parts of ammonium persulfate initiator.

[0025] In the above components, the preparation method of the modified polyacrylate mixture is as follows:

[0026] Add 23 parts of polyacrylate, 4 parts of polyvinyl alcohol, and 4 parts of dimethyl diallyl ammonium chloride in parts by weight into the reaction kettle for mixing. The mixing temperature is 85°C and the mixing time is 15 minutes. , to obtain a modified polyacrylate mixture.

[0027] The preparation method of the binder for the above lithium ion battery, the steps are as follows:

[0028] Step 1, taking each component according to parts by weight;

[0029] Step 2: Add ethyl 2-cyanoacrylate, cyanoethylethylenediamine, c...

Embodiment 3

[0031] An adhesive for lithium ion batteries, the components include in parts by weight: 8 parts of ethyl 2-cyanoacrylate, 5 parts of cyanoethylethylenediamine, 2 parts of citric acid, 2 parts of polyethyleneimine, modified 17 parts of permanent polyacrylate mixture, 3 parts of titanate coupling agent, 0.7 parts of ammonium persulfate initiator.

[0032] In the above components, the preparation method of the modified polyacrylate mixture is as follows:

[0033] Add 28 parts by weight of polyacrylate, 7 parts of polyvinyl alcohol, and 4 parts of dimethyl diallyl ammonium chloride into the reactor for mixing. The mixing temperature is 90°C and the mixing time is 16 minutes. , to obtain a modified polyacrylate mixture.

[0034] The preparation method of the binder for the above lithium ion battery, the steps are as follows:

[0035] Step 1, taking each component according to parts by weight;

[0036] Step 2, add 2-ethyl cyanoacrylate, cyanoethyl ethylenediamine, citric acid, p...

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PUM

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Abstract

The invention discloses an adhesive for lithium ion batteries and a preparation method of the adhesive for the lithium ion batteries. The adhesive is prepared from 2-cyanoacrylates, cyanoethyl ethylenediamine, citric acid, polyethyleneimine, a modified polyacrylate mixture, a coupling agent and an initiator. The preparation method includes: adding the 2-cyanoacrylates, the cyanoethyl ethylenediamine, the citric acid, the polyethyleneimine and the modified polyacrylate mixture into a reaction kettle, well mixing, heating to 60-70 DEG C, adding the coupling agent and the initiator, heating to 80-85 DEG C under inert gas protection, reacting for 40-60min, and cooling to the room temperature to obtain the adhesive. The adhesive for the lithium ion batteries is excellent in usability and further meets utilization requirements.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to an adhesive for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are currently one of the most extensively researched and in-depth energy storage devices. Because of their advantages such as high capacity density, high cycle life, environmental protection, wide operating temperature range and high safety performance, they are widely used in smartphones, Tablet PCs, electric vehicles and other fields. The performance of the electrode sheets of lithium-ion batteries is one of the key factors determining the performance of lithium-ion batteries, which are mainly composed of electrode active materials, conductive agents, binders and metal current collectors (copper foil or aluminum foil, etc.); It is used to bond electrode active materials and conductive agent particles, and at the same time bond them to the ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525Y02E60/10
Inventor 周江王正飞杨同兴马骁
Owner JIANGSU SHENSU ELECTRONICS TECH CO LTD
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