Hybrid Multilayer Electrode Films for Pore Structure and Stability
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Solution Overview
Problem
Existing methods of electrode film fabrication for energy storage devices impose practical limits on structural properties, limiting the performance of energy storage devices such as batteries and capacitors.
Innovation Solution
A multilayer hybrid electrode film is developed, comprising a dry-processed active layer with a fibrillizable binder and a wet-processed active layer with processing solvent residue, which are laminated together with optional additional layers like composite powders or adhesive pastes, to form a free-standing film suitable for energy storage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing single-layer electrode film fabrication methods are used, then manufacturing simplicity is maintained, but structural properties and device performance are limited
Solution Approach 1:
The electrode film is divided into multiple distinct layers, each with specific functions: a dry-processed layer providing mechanical stability and a wet-processed layer providing electrochemical activity. This segmentation allows optimization of each layer's properties independently, resolving the contradiction between performance and complexity by making the complexity functional rather than arbitrary.
Solution Approach 2:
The invention combines two different processing methodologies (dry and wet) into a composite electrode film structure. The dry-processed layer uses polymer-based binders for stability, while the wet-processed layer uses slurry casting for optimized active material distribution. This composite approach enables simultaneous achievement of mechanical integrity and electrochemical performance.
2Strength
If dry-processed layers are used, then mechanical stability is improved, but electrochemical performance is limited
Solution Approach 1:
The electrode is segmented into functional layers where the dry-processed layer specifically provides mechanical stability through polymer binder networks, while the wet-processed layer provides electrochemical performance through optimized active material distribution. This functional segmentation resolves the contradiction by assigning different performance aspects to different layers.
Solution Approach 2:
The invention merges two previously separate electrode fabrication approaches (dry processing and wet processing) into a single integrated multilayer structure. The dry layer contributes mechanical properties while the wet layer contributes electrochemical properties, and their combination creates an electrode that achieves both stability and performance simultaneously.
3Reliability
If wet-processed layers are used, then electrochemical performance is improved, but mechanical stability and solvent residue are compromised
Solution Approach 1:
The wet-processed layer is segmented as a distinct functional component responsible for electrochemical performance, while the mechanical stability function is assigned to the separate dry-processed layer. This segmentation allows the wet layer to be optimized for electrochemical activity without compromising overall mechanical stability.
Solution Approach 2:
The dry-processed layer acts as an intermediary that provides mechanical stability to the wet-processed layer. By placing the mechanically robust dry layer in contact with the electrochemically active wet layer, the structure mediates between the conflicting requirements of mechanical strength and electrochemical performance.
4Reliability
If multilayer hybrid structure is implemented, then performance and stability are improved, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process is segmented into two independent stages: dry processing followed by wet processing. Each stage can be optimized and controlled separately, which actually simplifies the overall manufacturing complexity compared to attempting to achieve both mechanical and electrochemical properties in a single homogeneous layer.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The multilayer electrode film enhances the performance of energy storage devices by improving pore structure, cost-effectiveness, and stability, leading to increased power density and reduced capacity fade over the life of the device.
Implementation Method 1
a dry-processed active layer with a fibrillizable binder
Data Source
AI summary
Provided herein are energy storage device electrode films comprising a hybrid electrode film, and methods of forming such multilayer hybrid electrode films and energy storage devices comprising multilayer hybrid electrode films. Each hybrid electrode film may comprise a self-supporting dry coated active layer and a wet cast active layer, wherein each active layer comprises a binder and an active material. The binder and/or active material may be the same or different as any other active layer. The hybrid multilayer electrode film may further comprise at least one additional layer, and the hybrid multilayer electrode film may be laminated with a current collector to form an electrode.