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

Polyimine conductive binder for silicon-based negative electrode of lithium ion battery

A conductive binder and lithium-ion battery technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as low load capacity, inability to greatly increase energy density, unstable electrode structure, etc., and achieve Improved energy density, convenient and feasible process conditions, and excellent electrochemical performance

Active Publication Date: 2019-09-24
NANKAI UNIV
View PDF20 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the existing problems in the background technology, that is, the low energy density caused by the low conductivity of the silicon-based negative electrode of the lithium-ion battery, which cannot greatly increase the loading of the active material in the electrode, and the instability of the electrode structure during the cycle, etc. problem, a polyimide conductive adhesive was designed

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
  • Polyimine conductive binder for silicon-based negative electrode of lithium ion battery
  • Polyimine conductive binder for silicon-based negative electrode of lithium ion battery
  • Polyimine conductive binder for silicon-based negative electrode of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]The specific operation method of preparing conductive adhesive is as follows:

[0043] Add 0.4746g (3 mmol) of 1,5-naphthalene diamine and 0.631g (3 mmol) of 4,4-biphenyldicarbaldehyde into a three-necked flask, add 10ml of DMSO as a solvent, and stir evenly with magnetic force;

[0044] Vacuumize and then pass in argon, repeat three times, heat the oil bath and gradually raise the temperature to 90°C, and react for 12 hours to obtain a conductive adhesive solution.

[0045] The above solution was dialyzed 3 times with DMSO (the volume ratio of binder solution to DMSO was 1:100), and the excess solvent was removed by rotary evaporation, and then vacuum 75 o C and dried for 12 h to obtain the conductive adhesive product.

[0046] The concrete operation of preparing lithium-ion battery is as follows:

[0047] Weigh 0.05g of binder, add 8ml of NMP, and stir to disperse. Weigh 0.95 nanometer silicon, add it to the binder solution, and stir for 24 h to make the slurry even...

Embodiment 2

[0053] The specific operation method of preparing conductive adhesive is as follows:

[0054] Add 0.553g (3mmol) 4,4'-diaminobiphenyl and 1.261g (6mmol) 4,4-biphenyldicarbaldehyde into a three-necked flask, add 10ml of DMSO as a solvent, and stir evenly with magnetic force;

[0055] Vacuumize and then pass in argon, repeat three times, heat the oil bath and gradually raise the temperature to 60°C, and react for 12 hours to obtain a conductive polyimide binder solution.

[0056] Dialyze 3 times with DMSO (the volume ratio of binder solution to DMSO is 1:100), rotary evaporate to remove excess solvent, and then vacuum 75 o C and dried for 12 h to obtain the conductive polymer binder.

[0057] The concrete operation of preparing lithium-ion battery is as follows:

[0058] Weigh 0.05g of binder, add 8ml of NMP, and stir to disperse. Weigh 0.95g of nano-silicon, add it into the binder solution, and stir for 24 hours to make the slurry evenly mixed.

[0059] The obtained negativ...

Embodiment 3

[0064] The specific operation method of preparing conductive adhesive is as follows:

[0065] Add 0.276g (1.5mmol) 4,4'-diaminobiphenyl, 0.324g (1.5mmol) 3,3-dihydroxybenzidine and 0.631g (3mmol) 4,4-biphenyldicarbaldehyde into the three-necked flask, Add 10ml of DMSO as a solvent and stir evenly with magnetic force;

[0066] Vacuumize and then pass in argon, repeat three times, heat the oil bath and gradually raise the temperature to 100°C, and react for 12 hours to obtain a conductive polyimide binder solution.

[0067] Dialyze 3 times with DMSO, remove excess solvent by rotary evaporation, and then vacuum 75 o C and dried for 12 h to obtain the conductive polymer binder.

[0068] The concrete operation of preparing lithium-ion battery is as follows:

[0069] Weigh 0.05g of binder, add 8ml of NMP, and stir to disperse. Weigh 0.95 of the silicon-carbon composite negative electrode material, add it into the binder solution, and stir for 24 h to make the slurry evenly mixed...

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
Discharge specific capacityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a polyimine conductive binder for a silicon-based negative electrode of a lithium ion secondary battery, which is characterized in that a conductive polymer is copolymerized by using a monomer A and a monomer B as raw materials, wherein the monomer A is one or a mixture of 1,5-naphthylene diamine, 4,4'-diaminodiphenyl or 3,3'-dihydroxybenzidine; the monomer B is one or a mixture of naphthalene-2,3 dialdehyde, 4, 4-biphenyldicarboxaldehyde or 6-hydroxy-2-naphthaldehyde; and the infrared spectrum test shows that there is a characteristic absorption peak of the imino at 1645(+ / -5)cm<-1>. The invention can completely abandon the use of the traditional conductive agent and greatly improve the load capacity of active substance in the electrode; through abundant hydrogen bonds and physical crosslinking in a molecular chain, an abundant crosslinking network is formed, the volume expansion of a silicon-based material is inhibited, and the electrode structure is stabilized. The polyimine conductive binder is especially suitable for the silicon-based negative electrode of the lithium ion secondary battery. The electrode has the characteristics of good rate performance, high cycling stability, long cycling life, simple preparation process, ability of being suitable for industrial production and the like.

Description

technical field [0001] The invention relates to a polyimide conductive adhesive used for a silicon-based negative electrode of a lithium ion secondary battery. Background technique [0002] Lithium-ion secondary batteries are widely used in transportation, energy storage, and 3C digital fields due to their high energy density, long cycle life, and low self-discharge rate. The anode material of commercialized lithium-ion secondary batteries is still dominated by graphite. However, its low theoretical specific capacity (372mAh / g) is difficult to continue to meet people's demand for high-performance secondary batteries. [0003] Silicon-based anode material is considered to be a very promising carbon replacement material due to its high specific capacity (3579 mAh / g) and abundant natural reserves. However, silicon will produce a large volume expansion during repeated charge and discharge, resulting in the separation of electrode materials, conductive agents and current collec...

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
IPC IPC(8): H01M4/62H01M10/0525H01M10/058C08G12/08
CPCH01M4/622H01M10/0525H01M10/058C08G12/08Y02E60/10Y02P70/50
Inventor 杨化滨高世伦潘宜漾
Owner NANKAI UNIV
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