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A multifunctional modified polymer lithium ion battery binder and its application in electrochemical energy storage devices

A polymer binder, lithium-ion battery technology, applied in electrochemical generators, battery electrodes, polysaccharide adhesives, etc. Insufficient junction strength and elasticity, limited use range, etc., to achieve the effects of reducing electrochemical interface impedance, improving uniformity and flatness, and good elasticity

Active Publication Date: 2019-05-17
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

Styrene-butadiene rubber (SBR) / sodium carboxymethylcellulose (CMC) and polyacrylate water-based binders have been used in large-scale markets, but their adhesion, flatness of the pole piece and the effect of inhibiting the expansion of the pole piece are limited, so its scope of use is subject to certain restrictions
PVA as an emulsifier, copolymerization of styrene monomer and acrylate monomer (CN105261759A) can prepare water-based binder for lithium-ion batteries, but the disadvantages of polystyrene are brittleness, low impact strength, and easy occurrence of stress Cracking, poor heat resistance, etc.
Modified marine polysaccharide polymers (CN105576247A), such as the copolymerization of chitosan with acrylic acid and its ester monomers, can be used to prepare water-based binders for lithium-ion batteries, but their intrinsic bonding strength and elasticity are insufficient. The uniformity and flatness need to be further improved

Method used

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  • A multifunctional modified polymer lithium ion battery binder and its application in electrochemical energy storage devices
  • A multifunctional modified polymer lithium ion battery binder and its application in electrochemical energy storage devices
  • A multifunctional modified polymer lithium ion battery binder and its application in electrochemical energy storage devices

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Experimental program
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Effect test

Embodiment 1

[0053] (1) First, 1 g of sodium carboxymethylcellulose was pre-dissolved in 50 ml of deionized water (DI-Water), and fully stirred under an argon atmosphere for 0.5 to 2.5 hours to remove oxygen to obtain a uniform and well-dispersed solution; The stirring speed is 100-500 rpm;

[0054] (2) Weigh 0.1g (NH 4 ) 2 S 2 o 8 Add the initiator to the solution obtained in step (1), and stir thoroughly to obtain a mixed solution; then add 2.5g of acrylic acid monomer, adjust the reaction temperature to 55°C, keep stirring, and react at a constant temperature for 2.5h to obtain a transparent and uniform glue. It is a multifunctional modified polymer lithium-ion battery binder; the solid content is 6.5wt%, and the viscosity is 164.5mPa.s, see Table 1, and its infrared spectrum can be found in figure 1 .

Embodiment 2

[0056] Referring to Example 1, the difference is that the monomers added are 2.5 g of acrylic acid and 0.84 g of acrylonitrile. The initiator used is 0.1g (NH 4 ) 2 S 2 o 8 / 0.03g NaHSO 3 , to obtain light white and slightly transparent emulsion, which is the binder of multifunctional modified polymer lithium ion battery, with a solid content of 8wt%, and a viscosity of 432.1mPa.s, see Table 1, and its infrared spectrum is shown in figure 1 .

Embodiment 3

[0058] Referring to Example 1, the difference is that the added monomers are 2.5g of acrylic acid, 0.84g of acrylonitrile and 1g of acrylamide. The initiator used is 0.1g (NH 4 ) 2 S 2 o 8 / 0.03g NaHSO 3 , the temperature of the reaction is 60°C, and a transparent slightly white emulsion is obtained, which is a binder for multi-functional modified polymer lithium-ion batteries, with a solid content of 9.6wt% and a viscosity of 1377.4mPa.s, see Table 1, its infrared Spectrum see figure 2 .

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Abstract

The invention discloses a multi-functional modified polymer binder for lithium ion batteries. The binder uses biomass polymers or synthetic polymers as substrates, and uses hydrophilic monomers and lipophilic monomers as functional modified The monomer is modified by free radical graft copolymerization or Michael addition reaction. It has a three-dimensional space network body with multi-branch structure, which can provide more active sites in contact with electrode active materials, and can improve the composition of electrode slurry. The uniformity and flatness of the film; enhanced the peel strength of the active material and the conductive agent to the metal substrate, has excellent elasticity and adhesion, can be applied in water / organic solvents, and can be applied to the positive and negative electrodes of lithium-ion batteries , is conducive to the conduction of electrons / ions in the process of charging and discharging, reduces the electrochemical interface impedance of the pole piece, greatly improves the high rate performance and cycle stability of the positive and negative electrode materials of lithium batteries, and the synthetic raw materials have a wide range of sources, which can significantly Reduce costs and have broad market prospects.

Description

Technical field: [0001] The invention relates to a polymer lithium ion battery binder, in particular to a multifunctional modified polymer lithium ion battery binder and its application in electrochemical energy storage devices. Background technique: [0002] In the battery manufacturing process, it is necessary to use a binder to bind and process the powder electrode active material. As an important inactive component of lithium-ion batteries, the binder adheres electrode active materials and conductive agents to the current collector, and its performance directly affects the electrochemical performance of the battery. In addition to the role of bonding between the electrode active material, the conductive agent and the current collector, the binder should have sufficient elasticity to prevent the active material particles from swelling due to their own expansion and contraction during battery charging and discharging. It is conducive to the conduction of electrons and ion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCH01M4/13H01M4/622H01M10/0525C08F251/02C09J105/16C08L71/02H01M4/133H01M4/131C09J105/00C09J101/08C09J103/04Y02E60/10C08F220/06C08F220/44C08F220/56C08F220/14C08F212/08C09J151/00C09J151/02C08F255/10C08F283/06C08F220/54C08F218/08C08F236/06C08K3/28C08K3/30C08K5/23C08K2003/285C08K2003/3045C08L1/286C08L47/00C08L51/02C08L79/02
Inventor 张灵志何嘉荣汪靖伦苏静
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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