Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of blended polyvinyl alcohol-based binder and its preparation method and application

A polyvinyl alcohol-based, polyvinyl alcohol-based technology, applied in the field of blended polyvinyl alcohol-based binders and their preparation, can solve problems such as poor functionality, poor dispersion of electrode materials, and low viscosity, and overcome poor mechanical properties , easy storage, simple process effect

Active Publication Date: 2022-06-28
苏州华赢新能源材料科技有限公司
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the use of a single polyvinyl alcohol binder has the disadvantages of low viscosity, poor functionality, and poor dispersion of electrode materials, so there is still a lot of room for improvement in the electrochemical performance of silicon negative electrodes.

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
  • A kind of blended polyvinyl alcohol-based binder and its preparation method and application
  • A kind of blended polyvinyl alcohol-based binder and its preparation method and application
  • A kind of blended polyvinyl alcohol-based binder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The invention provides a preparation method of a blended polyvinyl alcohol-based binder, comprising the following steps:

[0030] (1) dissolving polyvinyl alcohol in water at 20 to 100°C to obtain an aqueous solution of polyvinyl alcohol;

[0031] (2) dissolving galactomannan in water at 20-80°C, adjusting the pH to 5-9, to obtain an aqueous solution of galactomannan;

[0032] (3) blending the polyvinyl alcohol aqueous solution of step (1) and the galactomannan aqueous solution of step (2) to obtain a blended polyvinyl alcohol-based binder.

[0033] Preferably, in the above-mentioned preparation method of a blended polyvinyl alcohol-based binder, the mass fraction of the polyvinyl alcohol aqueous solution in step (1) is 1-20%.

[0034] Preferably, in the above-mentioned preparation method of a blended polyvinyl alcohol-based binder, the mass fraction of the galactomannan aqueous solution in step (2) is 1-20%.

[0035] Preferably, in the above-mentioned preparation met...

Embodiment 1

[0041] The present embodiment provides a blended polyvinyl alcohol-based adhesive, and the preparation method includes the following steps:

[0042] (1) Weigh 1.2g of polyvinyl alcohol powder in 38.8g of water, heat in a water bath at 95°C for 1 hour, and obtain a polyvinyl alcohol aqueous solution with a mass fraction of 3% after complete dissolution, and let it stand for later use;

[0043] (2) Weigh 0.5g of galactomannan powder into 24.5g of water, and control the pH to 6, heat in a water bath at 80°C for 1 hour, and obtain a 2% mass fraction of galactomannan aqueous solution after complete dissolution, and let stand spare;

[0044] (3) Blend 0.67 g of the polyvinyl alcohol aqueous solution and 2 g of the galactomannan aqueous solution to obtain a blended polyvinyl alcohol-based binder.

[0045] The method for applying the above-mentioned binder to a lithium ion battery is as follows: weighing 0.21 g of nano-silicon powder, 0.03 g of conductive carbon black, and 0.06 g of ...

Embodiment 2

[0047] This embodiment provides a blended polyvinyl alcohol-based binder, and the preparation method and application method thereof are the same as those in embodiment 1, except that the mass of the polyvinyl alcohol aqueous solution in step (3) is 1 g, and the galactomannan The mass of the aqueous sugar solution was 1.5 g.

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

PropertyMeasurementUnit
quality scoreaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and discloses a blended polyvinyl alcohol-based binder, a preparation method and application thereof. The invention blends the polyvinyl alcohol aqueous solution with a mass fraction of 1-20% and the galactomannan aqueous solution with a mass fraction of 1-20% to obtain a blended polyvinyl alcohol-based binder. Compared with a single polyvinyl alcohol binder, the composite membrane prepared with this blended binder has a smaller pore diameter, a more uniform pore size distribution, and higher thermal stability, which can effectively alleviate the cracking of silicon negative electrodes during cycling. problem, and changed the physical properties of the polyvinyl alcohol binder, so that it can buffer the huge volume change of the silicon negative electrode; it also has excellent lithium-conducting properties. The binder of the invention has wide application range, low cost, easy-to-obtain raw materials, simple process, friendly environment and easy realization of large-scale production.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a blended polyvinyl alcohol-based binder and a preparation method and application thereof. Background technique [0002] With its ultra-high theoretical specific capacity (up to 4200mAh / g at high temperature), high volume specific capacity (9786mAh / cm 3 ), low lithium deintercalation potential (<0.5V vs. Li / Li + ), high storage, low pollution and other advantages, it has become one of the most potential next-generation anode materials. However, the volume expansion of the silicon anode based on the alloyed lithium storage mechanism is relatively large, which causes the silicon to be easily pulverized and broken during the charging and discharging process, the solid electrolyte interface film is unstable, and the silicon is separated from the conductive network. These problems lead to the rapid decay of the cycle capacity of the ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525Y02E60/10
Inventor 王艳郑洪河王玮黄韦博吕林泽沈鸣
Owner 苏州华赢新能源材料科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com