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

Solid-state polyelectrolyte for lithium battery and preparation method of solid-state polyelectrolyte

A solid electrolyte and polyelectrolyte technology, which is applied in the field of polyether-polyamide block copolymer solid electrolyte and its preparation, solid polyelectrolyte and its preparation field, can solve problems such as Li+ transport obstacles, and achieve fast transport, source The effect of broad, good film formation and flexibility

Inactive Publication Date: 2021-11-26
BEIJING UNIV OF TECH
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrogen bonds between the molecular chains of this polyamide are very strong and difficult to be broken, which leads to certain obstacles in the transport of Li+ between the chain segments.

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
  • Solid-state polyelectrolyte for lithium battery and preparation method of solid-state polyelectrolyte
  • Solid-state polyelectrolyte for lithium battery and preparation method of solid-state polyelectrolyte
  • Solid-state polyelectrolyte for lithium battery and preparation method of solid-state polyelectrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Preparation of polyethylene oxide-polycaprolactam copolymer

[0034] Add carboxy-terminated polycaprolactam (molecular weight 4000) into the polymerization kettle, then add 60% by mass percentage of hydroxyl-terminated polyethylene oxide (molecular weight 2000) and 0.4% of the total mass of the matrix as a catalyst tetrabutyl titanate, vacuum- Inflate with nitrogen for 7 minutes each, and cycle three times. After heating under the protection of nitrogen until the raw materials are completely melted, turn on the stirring paddle. After reacting for 5 hours, vacuumize to remove unreacted monomers and a small amount of water produced by copolymerization, keep the vacuum <800Pa and continue the reaction for 1 hour, and discharge when the relative viscosity of the product is 1.36 to obtain polyethylene oxide-polycaprolactam intercalated Segment copolymer;

[0035] 2) Preparation of polyelectrolyte casting solution

[0036] Weigh 5g of the polyethylene oxide-polycaprolact...

Embodiment 2

[0041] 1) Preparation of polybutylene oxide-polycaprolactam copolymer

[0042] Add carboxyl-terminated polycaprolactam (molecular weight 4000) into the polymerization kettle, then add 75% mass percent of hydroxyl-terminated polybutylene oxide (molecular weight 5000) and 0.6% catalyst propyl titanate of the total mass of the matrix, vacuum- Inflate with nitrogen for 7 minutes each, and cycle three times. After heating under the protection of nitrogen until the raw materials are completely melted, turn on the stirring paddle. After reacting for 4 hours, vacuumize to remove unreacted monomers and a small amount of water produced by copolymerization, keep the vacuum degree <800Pa and continue the reaction for 2 hours. Segment copolymer;

[0043] 2) Preparation of polyelectrolyte casting solution

[0044] Weigh 6g of the polybutylene oxide-polycaprolactam copolymer prepared in step 1), add 50g of solvent acetonitrile, stir for 2h under heating at 70°C until completely dissolved, ...

Embodiment 3

[0049] 1) Preparation of polytetrahydrofuran diol-polylaurolactam copolymer

[0050] Add carboxyl-terminated polylaurolactam (molecular weight 8000) into the polymerization kettle, then add 80% polytetrahydrofuran diol (molecular weight 2000) and 0.3% catalyst isopropyl titanate of the total mass of monomers, pump Vacuum-fill with argon for 5 minutes each, cycle four times, heat under the protection of argon until the raw materials are completely melted, and then turn on the stirring paddle. After reacting for 5 hours, vacuumize to remove unreacted monomers and a small amount of water produced by copolymerization, keep the vacuum degree <800Pa and continue the reaction for 2 hours, and discharge when the relative viscosity of the product is 1.62 to obtain polytetrahydrofuran diol-polydodecalide Amide block copolymers;

[0051] 2) Preparation of polyelectrolyte casting solution

[0052] Weigh 4g of the polytetrahydrofuran diol-polylaurolactam copolymer prepared in step 1), ad...

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
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a solid-state polyelectrolyte for a lithium battery and a preparation method thereof and belongs to the field of lithium ion battery electrolytes. The method comprises the following steps: weighing a polyether-polyamide block copolymer or purchased commercial Pebax, adding the polyether-polyamide block copolymer or the purchased commercial Pebax into an organic solvent, stirring the polyether-polyamide block copolymer or the purchased commercial Pebax under the heating condition of 30-80 DEG C until the polyether-polyamide block copolymer or the purchased commercial Pebax is completely dissolved to obtain a solution with the concentration of 0.12 g / ml-0. 25g / ml, adding a lithium salt accounting for 5-60% of a polymer matrix into the solution, continuously stirring the solution until the lithium salt and the polymer matrix are fully mixed, defoaming the mixed solution, and obtaining a polyelectrolyte membrane casting solution; and uniformly blade-coating the polyelectrolyte membrane casting solution on a polyfluortetraethylene plate by using a scraper, performing standing at room temperature, and carrying out vacuum drying at 30-80 DEG C for 6-24 hours. As a block structure formed by polyether and polyamide can destroy regularity of polymer chain segments, polymer crystallization is effectively inhibited, and rapid transmission of Li<+> among chains is promoted, so that room-temperature lithium ion conductivity of the polyelectrolyte is improved.

Description

technical field [0001] The invention relates to a solid polyelectrolyte and a preparation method thereof, in particular to a polyether-polyamide block copolymer solid electrolyte and a preparation method thereof, belonging to the field of lithium batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density and long cycle life, and have great market advantages in the fields of mobile electronic devices and electric vehicles. Traditional lithium-ion batteries mostly use liquid electrolytes composed of organic carbonates and lithium salts, which are prone to liquid leakage during application, and will burn or even explode in high-temperature environments, which limits their further applications. The use of solid electrolytes to replace the separator and electrolyte of lithium-ion batteries has become an effective way to solve the safety problem of lithium batteries, which has attracted widespread attention from researchers. [0003]...

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 Applications(China)
IPC IPC(8): C08J5/18C08L87/00H01M10/0565H01M10/0525
CPCC08J5/18H01M10/0565H01M10/0525C08J2387/00H01M2300/0082Y02E60/10
Inventor 郭红霞丁青秦振平李钒丁培沛李明晔
Owner BEIJING UNIV OF TECH
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