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Method for uniform distribution of PTFE (polytetrafluoroethylene) binder and electrode key component materials and application in battery industry

A PTFE, PTFE-based technology, applied in the uniform distribution of PTFE binder and electrode key component materials and the application field in the battery industry, can solve the problems of affecting the electrode coating quality, uneven mixing distribution, poor dispersion effect, etc. , to achieve the effects of improving discharge performance and operation stability, improving dispersion effect, and increasing utilization rate

Active Publication Date: 2019-06-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned process of preparing electrode slurry based on physical mixing and stirring, due to the difference between the molecular structure of PTFE and the physical and chemical properties of the dispersed emulsion and the properties of the electrode powder itself, it is difficult to achieve an electrode obtained by preparing electrode slurry based on physical stirring and mixing. The uniform distribution of PTFE and electrode materials with water-repellent agent in the microscopic scale, PTFE resin and electrode materials are prone to secondary agglomeration during high-speed mechanical stirring, and the slurry is mostly agglomerated PTFE particles and electrode material aggregates Uneven mixing and distribution, agglomerated particles are prone to appear in the slurry, and the dispersion effect is poor, which not only affects the electrode coating quality, but also greatly affects the battery discharge performance and energy conversion efficiency
[0003] Therefore, it is urgent to develop a method for uniform distribution of PTFE and electrode materials used as electrode binders, and use it in electrochemical energy devices to solve the key problems of PTFE binders and electrodes in existing different battery electrode structures. Difficult to achieve uniform distribution among the technical status of the components

Method used

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  • Method for uniform distribution of PTFE (polytetrafluoroethylene) binder and electrode key component materials and application in battery industry
  • Method for uniform distribution of PTFE (polytetrafluoroethylene) binder and electrode key component materials and application in battery industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take by weighing PTFE emulsion (mass concentration is 60wt%), MnO respectively by 2:4:4 mass ratio 2 A total of 20 grams of powder and conductive carbon black, then put 60wt% PTFE emulsion in a 1L beaker, add 0.7L deionized water to make the mass concentration of PTFE 1%, fully stir and disperse evenly, then heat up to 50°C for later use. This is solution 1; the MnO 2 The powder and conductive carbon black are fully ground (it can be ground into powder, and the particle size of the powder is not particularly limited), after mixing evenly, add 0.7L aqueous solution containing 10mM / L sodium dodecylsulfonate, fully stir and disperse After uniformity, heat up to 50°C for later use. This is solution 2; while maintaining high-speed stirring, quickly add solution 1 to solution 2 within 1 minute, keep the reaction temperature constant, and stir at 600 rpm. After reacting for 2 hours, let it stand to cool down, remove the supernatant, filter the ternary compound at the bottom t...

Embodiment 2

[0044] Take by weighing PTFE emulsion (mass concentration is 60wt%), MnO 2 A total of 20 grams of powder and conductive carbon black, then put 60wt% PTFE emulsion in a 1L beaker, add 0.7L deionized water to make the mass concentration of PTFE 0.5%, fully stir and disperse evenly, then heat up to 80°C for later use. This is solution 1; the MnO 2 After the powder and conductive carbon black are fully ground and mixed evenly, add 0.7L aqueous solution containing 10mM / L sorbitan laurate, fully stir and disperse evenly, then heat up to 80°C for later use, this is solution 2; keep stirring at a high speed Next, solution 1 was quickly added to solution 2 within 10 minutes, keeping the reaction temperature constant, and the stirring speed was 600 rpm. After reacting for 2 hours, let it stand to cool down, remove the supernatant, filter the ternary compound at the bottom to remove excess liquid, then add a mixed solvent of 5mL water and 15mL ethanol, and after ultrasonic dispersion is...

Embodiment 3

[0046] Take by weighing 20 grams of PTFE emulsion (mass concentration is 60wt%), Pt black and conductive carbon black respectively by 2:4:4 mass ratio, then the PTFE emulsion of 60wt% is placed in the beaker of 1L, add 0.7L to Ionized water makes the mass concentration of PTFE 0.5%. After fully stirring and dispersing, heat up to 70°C for later use. This is solution 1; after fully grinding and mixing Pt black and conductive carbon black, add 0.7L containing 10mM / L lauric acid For the aqueous solution of sorbitan ester, stir well and disperse evenly, then heat up to 70°C for later use. This is solution 2; while maintaining high-speed stirring, quickly add solution 1 to solution 2 within 10 minutes, keep the reaction temperature unchanged, and stir The speed is 700 rpm. After reacting for 2 hours, let it stand to cool down, remove the supernatant, filter the ternary compound at the bottom to remove excess liquid, then add a mixed solvent of 100mL water and 100mL ethanol, and aft...

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Abstract

The invention discloses a method for uniform distribution of a PTFE (polytetrafluoroethylene) binder and electrode key component materials and an application in the battery industry. The method comprises the steps of carrying out ultrasonic dispersion or high-speed mechanical stirring on a water diluent of PTFE emulsion to obtain a solution 1; mixing conductive carbon powder, an electrode active component, a surfactant and water, then carrying out ultrasonic dispersion or high-speed mechanical stirring on the mixed solution to obtain a solution 2; preheating and mixing the solution 1 and the solution 2 to obtain a solution 3; carrying out high-speed stirring on the solution 3 for 1-6 hours under a constant temperature condition, standing and cooling to the room temperature so as to obtaina layered solid-liquid mixture; and removing a supernatant of the solid-liquid mixture to obtain a PTFE-conductive carbon powder-electrode active material ternary compound. The method realizes the uniform distribution of the binder, the conductive carbon powder and the electrode active material in an electrode, avoids the agglomeration of single component, improves the utilization ratio of the electrode active material and improves the discharge performance and operation stability of the battery; and the uniform distribution of each component in the electrode structure is obtained through preparing electrode slurry, there is no obvious secondary agglomeration, and the surface of the electrode is smooth, flat and free of obvious cracks.

Description

Background technique [0001] The structural formula of polytetrafluoroethylene (PTFE) is [CF 2 -CF 2 ] n , has excellent chemical stability and corrosion resistance, and is one of the best corrosion-resistant materials in the world today. In addition, PTFE has good aging resistance and excellent temperature resistance, and can be used in the temperature range of -180°C and 250°C It can work stably for a long time and can be widely used in aerospace, chemical, chemical, battery and other industries. PTFE is an important part of the positive and negative electrodes of various batteries. (1) The main function of PTFE in secondary electrode batteries such as nickel-metal hydride batteries and lithium-ion batteries and supercapacitors is to bond and connect the active components of the electrodes with the electrodes collectively, reduce the electrode impedance, and at the same time make the electrode sheets have good mechanical properties and machinability to meet the needs of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/04H01M4/139
CPCY02E60/10Y02E60/50
Inventor 王素力李焕巧孙公权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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