Electrode Composite Layer with Periodic Binder Gradients for Cycle Life
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Solution Overview
Problem
Existing methods for producing electrodes lack flexibility in switching between different types of electrochemical elements, such as lithium-ion batteries and capacitors, leading to inefficiencies in production and performance.
Innovation Solution
An electrode design featuring a binder concentration that varies periodically and continuously in one direction perpendicular to the electrode's thickness, incorporating active materials and a binder, which enhances binding and stress relief, improving cycle and rate characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform binder concentration is used in the electrode composite layer, then the manufacturing process is simple, but the cycle characteristics and rate characteristics are insufficient
Solution Approach 1:
The electrode composite layer is designed with non-uniform binder concentration distribution, where the binder concentration varies in the thickness direction. Specifically, the binder concentration is higher near the surface and lower near the base, creating local quality variations that optimize both binding strength and stress relief in different regions of the electrode layer.
Solution Approach 2:
The binder concentration parameter is changed continuously or periodically through the thickness of the electrode composite layer. This parameter variation allows the electrode to achieve improved cycle characteristics and rate characteristics by optimizing the binder distribution to balance adhesion and stress management requirements.
2Strength
If a uniform binder concentration is used in the electrode composite layer, then the structure is simple, but the stress relief capability is insufficient
Solution Approach 1:
Different regions of the electrode composite layer are assigned different binder concentrations to fulfill different functional requirements. The surface region with higher binder concentration provides strong binding, while the interior region with lower binder concentration facilitates stress relief, achieving local optimization of both binding strength and stress management.
Solution Approach 2:
The binder concentration distribution is designed to dynamically respond to stress conditions during electrode operation. The non-uniform concentration profile allows the electrode structure to adaptively manage stresses generated during charging and discharging cycles, improving overall structural integrity and performance.
Data Source
AI summary
An electrode is provided that includes a base and an electrode composite layer on the base. The electrode composite layer includes an active material and a binder. A concentration of the binder in the electrode composite layer varies periodically and continuously in at least one direction perpendicular to a thickness direction of the electrode composite layer.