Composite adhesive, pole piece prepared by means of the composite adhesive, preparation method and application thereof

A binder and pole piece technology, which is applied in the manufacture of hybrid/electric double layer capacitors, battery electrodes, structural parts, etc., can solve the problem of reducing the energy density of lithium-ion batteries or supercapacitors and their comprehensive performance cycle life, and increasing the pole piece Resistance, deterioration of battery performance and other issues, to achieve low internal resistance, improved cycle life, and high safety effects

Active Publication Date: 2016-07-20
CHINA AVIATION LITHIUM BATTERY LUOYANG
View PDF5 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, studies have found that for high-capacity electrode materials, especially silicon-based negative electrode materials, the volume expansion reaches more than 300% during the charging and discharging process, and the internal stress generated by the drastic volume change can easily lead to powdering and peeling of the electrode, resultin

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Composite adhesive, pole piece prepared by means of the composite adhesive, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The composite binder of this embodiment is composed of the following components in weight percentage: 1% phosphoric acid, 20% polyvinylidene fluoride, 5% phenolic resin, 2% methylated melamine resin, 6% polymethyl methacrylate, Methyl methacrylate-butyl acrylate-acrylic acid terpolymer latex 30%, sodium carboxymethyl cellulose 1%, polyimide 15%, ethanol 2%, N-methylpyrrolidone 18%. The mass fraction of the above-mentioned phosphoric acid is 20%.

[0043] The preparation method of the above-mentioned composite binder comprises the steps of: mixing the phosphoric acid, polyvinylidene fluoride, phenolic resin, methylated melamine resin, polymethyl methacrylate, methyl methacrylate-butyl acrylate-acrylic acid three The multi-polymer latex, sodium carboxymethyl cellulose, polyimide, ethanol, and N-methylpyrrolidone are mixed uniformly.

[0044] The positive electrode sheet of this embodiment is prepared by using the above-mentioned composite binder, and its preparation meth...

Embodiment 2

[0053] The composite binder of this embodiment is composed of the following components in weight percentage: 13% phosphoric acid, 45% polyvinylidene fluoride, 7% phenolic resin, 2.5% methylated melamine resin, and 8.5% polymethyl methacrylate , Methyl methacrylate-butyl acrylate-acrylic acid terpolymer latex 10%, sodium carboxymethyl cellulose 2%, polyimide 3%, ethanol 3%, N-methylpyrrolidone 6%. The mass fraction of the above-mentioned phosphoric acid is 10%.

[0054] The preparation method of the composite binder of the present embodiment comprises the following steps: the phosphoric acid, polyvinylidene fluoride, phenolic resin, methylated melamine resin, polymethyl methacrylate, methyl methacrylate-butyl acrylate - Acrylic terpolymer latex, sodium carboxymethyl cellulose, polyimide, ethanol, and N-methylpyrrolidone are mixed uniformly.

[0055] The positive electrode sheet of this embodiment is prepared by using the above-mentioned composite binder, and its preparation me...

Embodiment 3

[0064] The composite adhesive of this embodiment is composed of the following components in weight percentage: 7% phosphoric acid, 30% polyvinylidene fluoride, 9% phenolic resin, 3% methyl etherified melamine resin, 11% polymethyl methacrylate , Methyl methacrylate-butyl acrylate-acrylic acid terpolymer latex 15%, sodium carboxymethyl cellulose 4%, polyimide 7%, ethanol 4%, N-methylpyrrolidone 10%. The mass fraction of the above-mentioned phosphoric acid is 20%.

[0065] The preparation method of the composite binder of the present embodiment comprises the following steps: the phosphoric acid, polyvinylidene fluoride, phenolic resin, methylated melamine resin, polymethyl methacrylate, methyl methacrylate-butyl acrylate - Acrylic terpolymer latex, sodium carboxymethyl cellulose, polyimide, ethanol, and N-methylpyrrolidone are mixed uniformly.

[0066] The positive electrode sheet of this embodiment is prepared by using the above-mentioned composite binder, and its preparation ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a composite adhesive, a pole piece prepared by means of the composite adhesive, a preparation method and an application thereof, wherein the composite adhesive, the pole piece, the preparation method and the application thereof belong to the technical field of energy storage devices. The composite adhesive is composed of the following components by weight: 1-13% of phosphoric acid, 20-45% of polyvinylidene fluoride, 5-9% of phenolic resin, 2-3% of amino resin, 6-11% of polyacrylate, 10-30% of acrylate terpolymer latex, 1-4% of carboxymethylcellulose sodium, 3-17% of polyimide, 2-4% of ethanol and 6-18% of N-methylpyrrolidone. The composite adhesive can reduce the internal resistance of a lithium ion battery or a super-capacitor and settle problems such as electrode powdering and electrode peeling-off caused by size increase of the pole piece. Utilization rate and cycle life of the electrode material are improved.

Description

technical field [0001] The invention relates to a composite binder, a pole piece prepared by using the composite binder, a preparation method and an application thereof, and belongs to the technical field of energy storage devices. Background technique [0002] The binder is a very important part of the electrode materials of lithium-ion batteries and supercapacitors. The main function of the binder is to bind and maintain the active material, enhance the contact between the electrode active material and the conductive agent, and the active material and the current collector. Electronic contact, to better stabilize the structure of the pole piece. Moreover, the binder can play a certain role in buffering the volume expansion / shrinkage of lithium-ion battery electrodes during charging and discharging. Generally speaking, the properties of binders, such as cohesive force, flexibility, alkali resistance, hydrophilicity, etc., directly affect the performance of lithium-ion batt...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01G11/86H01M4/139H01M4/62
CPCH01G11/86H01M4/139H01M4/623Y02E60/10Y02E60/13
Inventor 潘文成赵晶晶怀永建臧超赵晓锋平丽娜李少军彭强王磊王伟王媛媛
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap