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Water-based binder for lithium ion battery and preparation method of water-based binder

A water-based binder and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of phase separation, water-based binder stability is difficult to control, etc., to solve volume expansion, easy to large-scale Promotion and preparation, the effect of improving Coulombic efficiency

Pending Publication Date: 2022-03-18
HAINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of water-based binders is not easy to control. When encountering hydrophobic materials or materials with different densities, phase separation is prone to occur.
A greater challenge with aqueous binders is preventing particle agglomeration when handling and drying electrode slurries, for example, conductive carbon additives tend to agglomerate in dense electrode slurries

Method used

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  • Water-based binder for lithium ion battery and preparation method of water-based binder
  • Water-based binder for lithium ion battery and preparation method of water-based binder
  • Water-based binder for lithium ion battery and preparation method of water-based binder

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preparation example Construction

[0031] In order to facilitate a better understanding of the preparation method and carrier preparation effect of this scheme, the following will further illustrate with specific examples.

[0032] The preparation method of aqueous binder for lithium ion battery of the present invention has the following steps:

[0033] (1) Take 5ml of PEDOT:PSS aqueous solution (density 1g / ml) with a mass fraction of 5% and mix it with 0.25-0.75g of PAA powder, and put it into a stainless steel ball mill tank (containing 20 stainless steel beads);

[0034] (2) Move the ball mill jar into the glove box (argon atmosphere protection, water oxygen content<0.01ppm) to seal, and prevent the occurrence of side reactions in the ball mill process through inert atmosphere protection;

[0035] (3) Seal ball milling at a speed of 350-400 rpm / min for 1.5-3 hours to obtain a certain ratio of PEDOT:PSS:PAA binder.

[0036] (4) After the ball milling is completed, put the ball mill jar into an ultrasonic cle...

Embodiment 1

[0038] The preparation method of the lithium-ion battery water-based binder of the present embodiment has the following steps:

[0039](1) After mixing 5ml of PEDOT:PSS aqueous solution with a mass fraction of 5% and 0.25g of PAA powder (equivalent to a mass ratio of 1:1), put it into a stainless steel ball mill tank (containing 20 stainless steel beads);

[0040] (2) Move the ball mill jar into the glove box (argon atmosphere protection, water oxygen content<0.01ppm) to seal, and prevent the occurrence of side reactions in the ball mill process through inert atmosphere protection;

[0041] (3) Sealed ball milling at 400 rpm / min for 1.5-3 hours to obtain a certain ratio of PEDOT:PSS:PAA binder.

[0042] (4) After the ball milling is completed, put the ball mill pot into an ultrasonic cleaning machine for low-power (50W) ultrasonication for 5 minutes to increase the fluidity of the binder and take out the viscous liquid product for battery production and testing.

[0043] The ...

Embodiment 2

[0048] The preparation method of the lithium-ion battery water-based binder of the present embodiment has the following steps:

[0049] (1) After mixing 5ml of PEDOT:PSS aqueous solution with a mass fraction of 5% and 0.5g of PAA powder (equivalent to a mass ratio of 1:2), put it into a stainless steel ball mill tank (containing 20 stainless steel beads);

[0050] (2) Move the ball mill jar into the glove box (argon atmosphere protection, water oxygen content<0.01ppm) to seal, and prevent the occurrence of side reactions in the ball mill process through inert atmosphere protection;

[0051] (3) Sealed ball milling at 400 rpm / min for 1.5-3 hours to obtain a certain ratio of PEDOT:PSS:PAA binder.

[0052] (4) After the ball milling is completed, put the ball mill pot into an ultrasonic cleaning machine for low-power (50W) ultrasonication for 5 minutes to increase the fluidity of the binder and take out the viscous liquid product for battery production and testing. The method of...

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Abstract

The invention discloses a water-based binder for a lithium ion battery, and the binder is prepared by compounding a poly (3, 4-ethylenedioxythiophene) monomer, polystyrene sulfonate (PEDOT: PSS) and polyacrylic acid (PAA). According to the water-based binder for the lithium ion battery, the high conductivity of PEDOT: PSS and the strong binding power and elasticity of PAA are combined, PEDOT: PSS and PAA are subjected to high-energy ball milling to form the composite binder PEDOT: PSS-PAA, electrochemical performance optimization is more remarkable, the preparation method is simple, the product purity is high, the cost is low, and large-scale popularization and preparation are easy.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and more specifically relates to an aqueous binder for lithium ion batteries and a preparation method thereof. Background technique [0002] Due to its high energy density, long service life, environmental protection and pollution-free characteristics, lithium-ion batteries have gradually become a new generation of energy storage power supply. Lithium-ion batteries are mainly composed of cathode, anode, separator, and electrolyte. The binder is an important component of the electrode, which plays a very important role in maintaining the electrode structure and ensuring the contact between the active material and the current collector. A good binder needs to have good electrical conductivity, which is conducive to electron transmission, good chemical stability, so that it will not deteriorate or denature during the electrochemical reaction process, and also have certain mechanical streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M4/624H01M10/0525Y02E60/10
Inventor 韦雅庆姚润哲王思琪刘旭豪李会巧陈永
Owner HAINAN UNIVERSITY
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