Multilayer Electrode Plate Barrier Layers for High-Speed Coating
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Solution Overview
Problem
High-speed coating in the manufacturing of multilayer electrode plates leads to binder migration away from the substrate, resulting in reduced binding strength, which affects the performance and longevity of battery electrodes.
Innovation Solution
A multilayer electrode plate design featuring alternately distributed binding and barrier layers, where the barrier layer comprises a multi-component copolymer different from the binder, prevents binder migration and enhances binding strength by restricting the first binder's movement across the barrier layer, even at high coating speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed coating is used to manufacture the electrode plate, then productivity is improved, but the binder migrates away from the substrate resulting in reduced binding strength
Solution Approach 1:
The electrode plate is divided into multiple layers including binding layers and barrier layers that are distributed alternately in the thickness direction. This segmentation prevents binder migration by creating distinct functional zones, allowing high-speed coating while maintaining binding strength through the barrier layers that restrict binder movement.
Solution Approach 2:
The barrier layer acts as an intermediary between the binding layer and the external environment. It comprises a multi-component copolymer that serves as a mediator to restrict the migration of the first binder away from the substrate, thereby maintaining binding strength even during high-speed coating processes.
2Strength
If multiple binding layers are coated at low speed to prevent binder migration, then binding strength is improved, but productivity decreases
Solution Approach 1:
Instead of using multiple binding layers coated at low speed, the invention segments the structure into binding layers and barrier layers distributed alternately. This allows the binding layers to provide sufficient binding strength while the barrier layers prevent binder migration, enabling the process to be performed at high coating speeds without sacrificing binding strength.
Solution Approach 2:
The invention changes the composition parameter of the barrier layer to include a multi-component copolymer with specific functional groups that restrict binder migration. This parameter change allows the system to maintain binding strength at high coating speeds by chemically restricting binder movement rather than relying on low-speed coating processes.
Data Source
AI summary
The present application discloses an electrode plate for a battery, a battery and a power consuming device. The electrode plate for a battery may comprise: a substrate, at least one binding layer and at least one barrier layer laminated in sequence on the substrate, wherein the binding layer and the barrier layer may be distributed alternately in the thickness direction; the binding layer may comprise a first binder; and the barrier layer may comprise a multi-component copolymer different from the first binder and an optional second binder, identical to or different from the first binder in the binding layer, wherein the multi-component copolymer may be a linear multi-component copolymer.