Multi-element functional modification polyvinyl alcohol-based lithium ion battery aqueous binder and application of the binder in electrochemical power storage device

A technology of polyvinyl alcohol-based lithium and lithium-ion batteries, applied in electrochemical generators, battery electrodes, electrical components, etc., can solve problems such as low impact strength, poor heat resistance, stress cracking, etc., to prolong service life and improve Uniformity, the effect of simple preparation method

Active Publication Date: 2016-09-21
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Modified PVA is used as lithium-ion battery binder and also has research report, and acetal modified PVA resin (CN105518914A) and PVA graft copolymerization polymer (CN105637686A) can be used as oily binder and be applied to lithium-ion battery; Chemically modified PVA composite polyacrylic acid can be used as a water-based binder for silicon negative lithium-ion batteries (Journal of Power Sources 298 (2015) 8-13); PVA is used as an emulsifier, styrene monomer and acrylate monomer Copolymerization (CN105261759A) can be used to prepare water-based binders for lithium-ion batteries, but the disadvantages of polystyrene are brittleness, low impact strength, prone to stress cracking, poor heat resistance, etc.

Method used

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  • Multi-element functional modification polyvinyl alcohol-based lithium ion battery aqueous binder and application of the binder in electrochemical power storage device
  • Multi-element functional modification polyvinyl alcohol-based lithium ion battery aqueous binder and application of the binder in electrochemical power storage device
  • Multi-element functional modification polyvinyl alcohol-based lithium ion battery aqueous binder and application of the binder in electrochemical power storage device

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) First dissolve 3 grams of polyvinyl alcohol in 50 ml of deionized water (DI-Water), and fully stir it under an argon atmosphere for 0.5-2.5 hours to obtain a uniform and well-dispersed solution;

[0040] (2) Weigh 0.1g NaOH catalyst in the reaction system in (1), fully stir to obtain a homogeneous system; add 2.5g acrylic acid monomer, the molar ratio of the hydroxyl-containing repeating polymerization unit of polyvinyl alcohol and acrylic acid monomer is 1 : 0.51, adjust the reaction temperature to 80°C, keep stirring, and react at constant temperature for 8 hours to obtain a transparent and uniform glue solution, and then neutralize it with LiOH to a pH of 6-7, which is a multi-functional modified polyvinyl alcohol-based lithium-ion battery water-based binder;

Embodiment 2

[0042] In this embodiment, the preparation method of the binder refers to Example 1, the difference is that the added monomer is a mixture: 2.5g of acrylic acid and 0.84g of acrylonitrile, polyvinyl alcohol containing hydroxyl repeating polymer units, acrylic acid monomer, and The molar ratio of acrylonitrile monomer is 1:0.51:0.23, and the reaction temperature is 80°C to obtain a white glue solution, which is then neutralized with LiOH to a pH of 6-7, which is a multi-functional modified polyvinyl alcohol-based lithium ion Water-based binder for batteries;

Embodiment 3

[0044] The preparation method of the binder in this example refers to Example 1, the difference is that the monomers added are a mixture: 2.5g of acrylic acid, 0.84g of acrylonitrile and 1g of acrylamide, polyvinyl alcohol containing repeating polymer units of hydroxyl groups, acrylic acid The molar ratio of monomer, acrylonitrile monomer, and acrylamide monomer is 1:0.51:0.23:0.21, and the reaction temperature is 80°C to obtain a white glue, which is then neutralized with LiOH to a pH of 6-7, which is Multifunctional modified polyvinyl alcohol-based lithium-ion battery water-based binder;

[0045] figure 1 It is the infrared contrast spectrum of the multifunctional modified polyvinyl alcohol lithium ion battery aqueous binder obtained in Examples 1-3 of the present invention. From figure 1 It can be seen from that, Example 1 is at 1668cm -1 There is an obvious stretching vibration signal of C=O in the carboxyl group at the wave number, and in addition to the stretching vib...

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Abstract

The invention discloses a multi-element functional modification polyvinyl alcohol-based lithium ion battery aqueous binder and application of the binder in an electrochemical energy storage device. According to the binder, polyvinyl alcohol is taken as substrate, and hydrophilic monomers and oleophylic monomers are taken as functional modification monomers. Through adoption of Michael addition reaction modification preparation, the binder has good water solubility, elasticity and bonding performance. Through application of the binder in the preparation process of the lithium ion battery electrode plate, the homogeneity of electrode slurry can be improved. Therefore, the electrode slurry can form film on a current collector evenly and flatly, the material of the electrode plate will not fall off, the capacity will not be reduced, the high rate capability and circulation stability of the lithium ion battery cathode and anode materials can be greatly improved, and the service life of the battery can be effectively extended.

Description

Technical field: [0001] The invention relates to a polymer lithium ion battery binder, in particular to a multifunctional modified polyvinyl alcohol-based lithium ion battery aqueous binder and its application in electrochemical energy storage devices. Background technique: [0002] The binder is an important inactive component of the lithium-ion battery that adheres the electrode active material and the conductive agent to the current collector, and its performance directly affects the electrochemical performance of the battery. In addition to requiring it to have a good bonding effect between the electrode active material, the conductive agent and the current collector, the binder should have sufficient dispersion to facilitate the conduction of electrons and ions during charge and discharge, reducing the The impedance between the current collector and the electrode material; in addition, the binder should have sufficient elasticity to prevent the active material particles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/623H01M10/0525H01M4/62Y02E60/10
Inventor 张灵志汪靖伦何嘉荣苏静
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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