In a Lithium Iron Phosphate (LFP) electrode, a “primer layer” is a thin coating applied directly onto the current collector (usually aluminium foil) that enhances the adhesion of the active LFP material to the collector, improving electrical conductivity and overall battery performance by minimizing contact resistance between the electrode and the current collector; this layer is typically composed of a carbon-based material to provide good electrical contact. [1, 2, 3, 4]
- Function: The primary role is to improve adhesion between the LFP active material and the current collector, especially when using low binder content in the electrode slurry. [1, 2, 5]
- Material composition: Most commonly, a carbon-based material like carbon-black, carbon nanotubes or graphene is used in the primer layer due to its high electrical conductivity. [1, 3, 4]
- Benefits: [1, 3, 4]
- Reduced contact resistance: By providing a better interface between the electrode and current collector, the primer layer minimizes electrical resistance at the contact point, leading to improved power delivery. [1, 3, 4]
- Enhanced cycle life: Lowering contact resistance can also improve the battery’s cycle life by reducing stress on the electrode during charge/discharge cycles. [1, 3, 4]
- Lower binder content: A well-designed primer layer can enable the use of less binder in the electrode slurry, potentially improving overall electrode performance. [2, 6, 7]
PAA 602N is a polymeric binder designed especially for primer layer coating. It can generate a high adhesion with a lower dosage during the scale primer layer production. Please contact us for more details and sample discussion.
