PVDF Binder For Lithium Battery

Catalog Number	ACMA00045237
Description	It is the homopolymer of vinylidene fluoride, which can be used as electrode binder for lithium battery. It is a kind of polyvinylidene fluoride with high molecular weight, it is soluble in polar organic solvents. It has high viscosity and strong adhesion, and it is easy to form film. The electrode materials of lithium battery made by it has good chemical stability, high temperature stability and good processability.
Melting Point	156-165 ℃
Density	1.75-1.77 g/cm3 at 23℃
Appearance	White powder without odor
Application	PDVF Powders are mainly used as electrode binder for lithium battery.
Shelf Life	3 years
Storage	1. Transported as non-dangerous cargo, avoid heat, moisture and strong shock during transportation. 2. Stored in a clean, dry and ventilated place at the temperature of 5-30℃, impurities like dust and moisture should be kept way. 3. Keep the container tightly closed.
Decomposition Temperature	≥380 °C
Feature	1. Soluble in polar organic solvents 2. Good chemical resistance 3. High viscosity and strong adhesion 4. Easy to form film 5. Good processability
Moisture Content	≤0.10%
Notes	Keep this product from high temperature to prevent toxic gas releasing at the temperature above 350°C
Packaging	Plastic drums lined with antistatic bag, net weight 20kg/drum.
Viscosity	Grade A: 3000-8500 mPa.S Grade B:>8500 mPa.S

Case Study

Study on the Binding Mechanism of PVDF in Lithium-Ion Batteries

Zhong, Xuehu, et al. Applied surface science, 2021, 553, 149564.

The binding mechanism of polyvinylidene fluoride (PVDF) in lithium-ion batteries is of great significance for the development of new binders. This work reveals the binding mechanism of PVDF through density functional theory (DFT) simulation calculations and analysis of the binding surface in lithium-ion batteries. This study shows that the development of new binders for LFP batteries should pay more attention to strengthening the binding effect between PVDF and Al. PVDF is a good binder for NCM batteries.
· The simulation and theoretical calculations suggest that the bonding interactions between LiFePO₄ (LFP) and PVDF are stronger than those between PVDF and Al in LFP batteries.
· Conversely, the bonding interactions between Li(Ni_1-x-yCo_xMn_y)O₂ (NCM) and PVDF are weaker than those between PVDF and Al in NCM batteries.
· SEM-EDS and AES analyses of the bonding surfaces reveal that PVDF is predominantly located on the surfaces of LFP materials in LFP batteries, while in NCM batteries, PVDF is evenly distributed between Al and NCM.
· Additionally, AES analyses show that there are no chemical interactions among the surfaces of the active materials, PVDF, and Al. In lithium ion batteries (LIBs), the active materials, Al and PVDF are mainly physical interactions.

Test Methods for Microscale Mechanical Properties of PVDF Binder Phase

Iyer, Anand HS, et al. Materials Science and Engineering: A, 2023, 881, 145352.

This work employs micromechanical testing techniques, including micropillar compression, microcantilever bending, and nanoindentation, to measure the mechanical properties of the PVDF binder phase in the active layer. In addition, quantitative values are provided that can be used as input for lithium-ion battery modeling and lifetime estimation.
· Nanoindentation tends to give a higher estimate of the modulus due to uncertainties related to the size of the test area and initial large compression strains leading to the closure of pores.
· The micropillar compression technique offers modulus data that is more consistent. The micropillar compression technique has enabled the evaluation of yield stress.
· The average Young's modulus for the PVDF binder phase obtained from nanoindentation is 9.5 ± 2.3 GPa. In comparison, the average Young's modulus for pure binder micropillars is 4.2 ± 0.8 GPa, with an average yield stress of 189 ± 31 MPa. For binder-particle micropillars, the average Young's modulus is 6.0 ± 1.7 GPa, and the average yield stress is 220 ± 68 MPa.
· Microcantilever bending tests provide moduli estimates that align with micropillar compression tests, although preparing samples for microcantilever bending tests is more labor-intensive and results in a wider range of measured elastic properties.

Custom Q&A

What is the role of PVDF in lithium-ion batteries?

PVDF acts as a binder between electrode species and collectors in lithium-ion batteries, increasing their lifespan and energy density.

What are the properties of PVDF?

PVDF is insoluble, has a low melting point, low permeation values, and a lower strength effect compared to other fluoropolymers.

What is one application of PVDF besides being a binder in batteries?

PVDF is used in wiring processes due to its high dialectic constant and dispersion factor.

What industries/sectors use PVDF binders?

PVDF binders are used in the oil and gas, biomedical science, pharmaceutics, food and beverage processing, waste management, construction, and batteries and electronic components industries.

What are the components of a lithium-ion battery?

A lithium-ion battery consists of a separator coating, an electrode binder, electrodes (cathode and anode), and other active materials like graphite.

What are the criteria for a battery binder?

The criteria for a battery binder include water absorption, ductility, adhesion, swelling in electrodes, purity, crystallinity, melting point, and distribution of molecular weight.

Why is the molecular weight of PVDF important in battery production?

The molecular weight of PVDF affects its stability and performance in batteries. Low molecular weight can lead to instability, while high molecular weight can cause swelling but not complete dissolution.

What other products can be made from PVDF?

PVDF can be used to produce pipes, sheets, films, containers, and other resin-based products.

What are some characteristics of PVDF's chemical makeup?

PVDF possesses high thermal and electrochemical stability and is highly resistant to solvents, hydrocarbons, and acids.

Why is PVDF commonly used as a binder in lithium-ion batteries?

PVDF is used as a binder in lithium-ion batteries due to its strong adhesion, high thermal and electrochemical stability, and chemical resistance in the harsh environment of the batteries.

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