PVDF Binder for Battery

Polyvinylidene fluoridePowder PVDF Binder for Battery

SPECIFICATIONS

Feature

TOB-PVDF-770 is a fluoropolymer binder for electrodes in lithium-ion battery.

It is especially suitable for high-nickel materials and sodium-ion batteries. 

It can solve the gel problem when mixing the slurry. In addition, it can also soften the battery electrode.

This binder shows better alkali resistance as compared with standard PVDF binders. Therefore, it has long-term stability with electrode slurry using strong alkaline active materials such as NMC811 and NCA, which enables stable coating in the electrode process.

This binder also applies the great flexibility on electrodes. It achieves high electrode density, and can contribute to high battery capacity.

PVDF (polyvinylidene fluoride) is a semi-crystalline polymer with excellent chemical stability, mechanical strength and heat resistance. As a battery binder, PVDF is widely used in battery manufacturing, especially in lithium-ion batteries, to fix active materials, conductive agents and current collectors to ensure the integrity of the electrode structure.

The role of PVDF in batteries

Binder function

PVDF bonds the active material (such as LiCoO₂, LiFePO₄ of the positive electrode or graphite of the negative electrode) and the conductive agent (such as carbon black) to the current collector (aluminum foil or copper foil) to prevent the material from falling off during charging and discharging.

Chemical stability

PVDF exhibits good chemical inertness in the battery electrolyte, can resist the corrosion of the electrolyte, and extend the battery life.

Mechanical strength

PVDF provides sufficient mechanical strength to prevent the electrode from cracking or falling off due to volume changes during charging and discharging.

Thermal stability

PVDF's high temperature resistance helps the battery remain stable in high temperature environments and improves safety.

Ionic conductivity

PVDF itself is not conductive, but by adding plasticizers or compounding with other materials, it can improve ionic conductivity and optimize battery performance.

Application in battery research and manufacturing

Electrode preparation

PVDF is used as a binder, mixed with active materials and conductive agents, and then coated on the current collector. After drying and calendering, it forms an electrode sheet.

Battery performance optimization

By adjusting the molecular weight, concentration and processing technology of PVDF, the bonding strength and conductivity of the electrode can be optimized to improve battery performance.

New battery development

PVDF is also used as a binder or electrolyte matrix in new batteries such as solid-state batteries and lithium-sulfur batteries, promoting the advancement of battery technology.

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