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

Novel battery pole piece enhancing method and corresponding pole piece

A battery pole piece and pole piece technology, which is applied in the field of new battery pole piece enhancement methods and corresponding pole pieces, can solve the problems of inability to meet the requirements of new binders, and the inhibition effect is not obvious, so as to enhance mechanical properties and reduce contact area, the effect of improving cycle performance

Active Publication Date: 2019-09-17
南京同宁新材料研究院有限公司
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these traditional binders have no obvious inhibitory effect on the volume expansion of silicon-based negative electrodes during cycling, and still cannot meet the demand for new binders for silicon-based 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
  • Novel battery pole piece enhancing method and corresponding pole piece
  • Novel battery pole piece enhancing method and corresponding pole piece
  • Novel battery pole piece enhancing method and corresponding pole piece

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] In general, the binder compounding and pole piece preparation method involved in the present invention may include the following steps:

[0030] S1: Take a certain amount of conventional water-based binder and dissolve it in water;

[0031] S2: dissolving a certain amount of polyurethane in nitrogen methylpyrrolidone (NMP) or nitrogen nitrogen dimethylformamide (DMF);

[0032] S3: Mix the binder obtained in S1, the conductive carbon black, and the alloy negative electrode in a certain proportion, and grind them into a slurry.

[0033] S4: The slurry obtained in S3 is evenly coated on the surface of the copper foil, and then placed in a vacuum drying oven to dry for a certain period of time.

[0034] S5: Soak the pole piece obtained in S4 in the polyurethane solution prepared in S2, take it out for a certain period of time and vacuum dry it, and obtain an electrode piece with enhanced mechanical properties.

Embodiment 1

[0037] Include the following steps:

[0038] S1: Dissolve 500 mg of sodium polyacrylate (PAA-Na) in 10 mL of water to prepare a 50 mg / mL binder.

[0039] S2: Dissolve 50 mg of polyurethane in 10 mL of nitrogen-methylpyrrolidone (NMP) to prepare a 5 mg / mL solution.

[0040] S3: Mix the binder obtained in S1, conductive carbon black and silicon powder (300nm) in a certain mass ratio, and grind them into a slurry (silicon / carbon black / PAA-Na mass ratio=80 / 10 / 10).

[0041] S4: The slurry obtained in S3 is evenly coated on the surface of the copper foil, and then placed in a vacuum drying oven at 80°C for 12 hours.

[0042] S5: Cut the pole pieces obtained in S4 into small discs with a certain diameter, then soak them in the polyurethane solution prepared in S2, take them out after 5 hours, and dry them in vacuum at 80 degrees.

[0043] S6: Assemble a lithium-ion battery by using metallic lithium as a counter electrode for the pole piece obtained in S5.

Embodiment 3

[0051] Include the following steps:

[0052]S1: Dissolve 150 mg of sodium carboxymethylcellulose (CMC) and 150 mg of styrene-butadiene rubber (SBR) binder in 10 mL of water, respectively.

[0053] S2: Dissolve 300 mg of polyurethane in 10 mL of nitrogen methylpyrrolidone (NMP).

[0054] S3: Mix the binder obtained in S1, conductive carbon black and antimony in a certain proportion, and grind them into a slurry (mass ratio of antimony / carbon black / CMC / SBR=60 / 20 / 10 / 10).

[0055] S4: The slurry obtained in S3 is evenly coated on the surface of the copper foil, and then placed in a vacuum drying oven at 80°C for 12 hours.

[0056] S5: Cut the pole pieces obtained in S4 into small discs with a certain diameter, then soak them in the polyurethane solution prepared in S2, take them out after 12 hours, and dry them in vacuum at 80 degrees.

[0057] S6: Assemble a sodium ion battery by using metallic sodium as a counter electrode on the pole piece obtained in S5.

[0058] figure 1 ...

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 belongs to the field of battery pole piece binders, and particularly discloses a novel battery pole piece reinforcing method and a corresponding pole piece. The reinforcing method comprises the following steps: S1, dissolving a water-based binder in water to obtain a binder solution; s2, preparing a polyurethane solution; s3, mixing the binder solution obtained in the step S1 with conductive carbon black and a source material corresponding to an alloy negative electrode material, and grinding the mixture into slurry; s4, uniformly coating the slurry obtained in the step S3 on the surface of a copper foil, and then drying to obtain a pole piece; and S5, soaking the pole piece obtained in the step S4 in the polyurethane solution obtained in the step S2, taking out the pole piece, and drying the pole piece to obtain an enhanced battery pole piece which can be used as a negative pole piece to be applied to a lithium ion battery or a sodium ion battery. According to the invention, the polyurethane binder is introduced into the alloy negative electrode material, so that the cycle performance of the alloy negative electrode in the lithium / sodium ion battery can be effectively improved.

Description

technical field [0001] The invention belongs to the field of battery pole piece binders, and more specifically relates to a novel battery pole piece strengthening method and corresponding pole piece, which utilizes polyurethane to enhance the mechanical properties of the battery pole piece. Background technique [0002] Lithium-ion batteries have developed rapidly due to their outstanding advantages such as long cycle life, high energy density, and environmental protection, and have been widely used in portable electronic products, energy storage equipment, new energy vehicles and other fields. At present, the negative electrode of lithium-ion batteries is mainly graphite, etc., but the specific capacity of graphite is low (~372mAh / g), which has been difficult to meet the market demand for high-energy lithium-ion batteries. [0003] Therefore, researchers have developed alloy anode materials such as silicon and tin, which have the advantages of low cost and high theoretical ...

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): H01M4/1395H01M4/04H01M4/134H01M4/62H01M10/0525H01M10/054
CPCH01M4/0404H01M4/0416H01M4/134H01M4/1395H01M4/621H01M4/622H01M10/0525H01M10/054Y02E60/10
Inventor 张五星陈伟伦薛丽红黄云辉
Owner 南京同宁新材料研究院有限公司
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