PVDF Binder for Li-ion Battery Electrodes

When testing the electrochemical performance of metal oxide anode for lithium-ion batteries (LIBs), binder played important role on the electrochemical performance. There are different types of binders used for Li-ion battery electrodes like polyvinylidene fluoride (PVDF) and the mixture of styrene butadiene and sodium carboxylmethyl cellulose (SBA + CMC). Here we will mention PVDF type binder.

Polyvinylidene fluoride (PVDF) is a highly non-reactive thermoplastic fluoropolymer produced by the polymerization of vinylidene difluoride. PVDF is a specialty plastic used in applications requiring the highest purity, as well as resistance to solvents, acids and bases.

PVDF resins are polymers currently widely used by Li-ion battery manufacturers as binder material, especially in cathodes. PVDF is the standard binder material used in the production of composite electrodes for lithium-ion batteries. 1−2% weight solution of PVDF dissolved in N-methyl-2-pyrrolidone (NMP) is mixed with an active lithium storage material such as graphite, silicon, tin, LiCoO2, LiMn2O4, or LiFePO4 and a conductive additive such as carbon black or carbon nanofibers. This slurry is cast onto a metallic current collector and the NMP is evaporated to form a composite or paste electrode. PVDF is used because it is chemically inert over the potential range used, and does not react with the electrolyte or lithium. PVDF electrochemically stable in contact with electrolyte mixtures.

PVDF binders’ usage in Li-ion battery electrodes have these benefits that you can see below:

Excellent resistance to adverse weather conditions over a wide range of temperatures
Excellent mechanical strength
Outstanding chemical resistance
Good processing performance and workability

This subject is an interesting to many people and of course there are some papers written by the scientists about this subject. You may look at the paper which is about the effect of different binders on the electrochemical properties metal oxide anode for lithium-ion batteries:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5662525/

If you would like to give order of PVDF Binder for Li-ion Battery Electrodes you may click the link given below:

https://nanografi.com/battery-equipment/pvdf-binder-for-li-ion-battery-electrodes-set-80g/

Technical properties of our PVDF Binder for Li-ion Battery Electrodes are given below:

Technical Parameter	Unit	Index	Testing
Shape	/	White Powder	/
Purity	%	≥99.5	PVDF
standard specific gravity	/	1.74~1.77	ASTM D 792 @23/ 23℃
Dielectric constant	100MHz 100Hz	4.50~5.50 8.00~9.50	ASTM D150
Melting Point	℃	160-168	ASTM D 3418
Melting Indix	g/10min	1-2	/
Solubility	/	Transparent and dissolvable	30℃，1hr 1g/10ml NMP
Rotation Viscosity	mPaS	≥2000	1g/10ml NMP
Intrinsic Viscosity	dL/g	1.0-2.0	DMA， 30℃
Moisture	%	≤ 0.1	Karl Fischer
Molecular Weight	/	600,000	ASTM D 5296-05

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