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

Method for improving adhesive performance of lithium battery polyvinylidene fluoride by irradiation

A polyvinylidene fluoride, lithium battery technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as unreported, expansion and deformation, not found, etc., to reduce processing procedures and reduce swelling. , the effect of high production efficiency

Active Publication Date: 2017-02-22
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
View PDF4 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Due to the unique physical and chemical properties of PVDF, a variety of grafted modified polymers have been used in batteries and other devices. However, the existing literature mainly focuses on the direction of modified PVDF membranes for proton exchange. Although the current commercial Batteries widely use PVDF as the binder of cathode and anode materials, but the work of irradiation modified PVDF binder has not been reported yet.
The amount of PVDF used in the patents of a small number of companies, as well as the process of mixing with other powders to make films, also raised the problems of insufficient viscosity and expansion and deformation of PVDF as a binder, but no particularly suitable method has been found [CN101412835 -A, CN101136467-A, CN1277236-A]

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
  • Method for improving adhesive performance of lithium battery polyvinylidene fluoride by irradiation
  • Method for improving adhesive performance of lithium battery polyvinylidene fluoride by irradiation
  • Method for improving adhesive performance of lithium battery polyvinylidene fluoride by irradiation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of positive electrode sheet for lithium ion battery:

[0029] The positive electrode active material lithium cobalt oxide, lithium nickel cobalt manganese oxide, conductive carbon, and binder PVDF were mixed in the solvent NMP according to the mass ratio of 70:25:3:2, and stirred evenly to obtain the positive electrode slurry. Coat the obtained positive electrode slurry on a 9 μm aluminum foil, dry, and cold press to obtain a compacted density of 1.5 g / cm 3 The pole piece is then cut and welded to obtain the positive pole piece.

[0030] Preparation of lithium ion battery negative electrode sheet:

[0031] Add the negative electrode active material natural graphite, conductive carbon, and binder PVDF (final melting temperature is 160 degrees) into the solvent NMP according to the mass ratio of 96:2:2, and mix well to obtain the negative electrode slurry, and then coat the negative electrode slurry with Coated on both sides of 8μm thick metal copper foil, d...

Embodiment 2

[0040] Different from Example 1 is the irradiation of lithium ion battery:

[0041] Place the lithium-ion battery on the under-beam device under the denami accelerator, load it on a trolley, and lay it out in an orderly manner. Select the denami accelerator, the accelerator energy is 5MeV, adjust the parameters of the irradiation equipment, and adjust the accelerator energy and the speed of the device under the accelerator beam so that the dose rate is 5000Gy / s, and the lithium-ion battery is irradiated. 70kGy, making PVDF partially cross-linked. Afterwards, the lithium-ion battery was taken out of the car, and the battery performance was tested.

[0042] All the other are with embodiment 1.

Embodiment 3

[0044] Different from Example 1 is the irradiation of lithium ion battery:

[0045] Place the lithium-ion battery on the under-beam device under the denami accelerator, load it on a trolley, and lay it out in an orderly manner. Select the denami accelerator, the accelerator energy is 5MeV, adjust the parameters of the irradiation equipment, and adjust the accelerator energy and the speed of the device under the accelerator beam so that the dose rate is 5000Gy / s, and the lithium-ion battery is irradiated. 100 kGy, making PVDF partially cross-linked. Afterwards, the lithium-ion battery was taken out of the car, and the battery performance was tested.

[0046] All the other are with embodiment 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
Compaction densityaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

A method for improving adhesive performance of lithium battery polyvinylidene fluoride by irradiation belongs to the technical field of lithium batteries. A lithium battery with polyvinylidene fluoride (PVDF) adhesive is prepared, the whole battery is placed under an electronic accelerator or on a radiation processing device of Dynamitron and is exposed to irradiation under the irradiation dosage of 20-200 kGy and irradiation dosage rate of 50-15000 Gy / s, PVDF is partially crosslinked, the adhesive performance of PVDF is changed, battery thickness bulking rate is decreased, capacity retention of the battery is increased, battery stability is improved, and the service life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a method for improving the adhesive performance of polyvinylidene fluoride of lithium batteries by irradiation. Background technique [0002] Energy is the material basis for human survival and development. Fossil fuels (coal, oil, natural gas) have always been the main body of human energy utilization. With the rapid development of society, problems such as non-renewable fossil fuels, limited reserves, and environmental pollution caused by combustion processes have gradually emerged. Electricity obtained through the conversion of natural energy such as wind energy, solar energy, hydroelectric energy, geothermal energy, and ocean energy cannot be applied on a large scale due to poor stability and continuity. Batteries, especially secondary batteries, as an energy storage medium that stores discontinuous electricity and releases it smoothly during application, realizes t...

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): H01M4/62H01M10/0525H01M10/058
CPCH01M4/621H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 罗敏马玲玲徐殿斗
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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