Electron Beam Treated Current Collector for Battery Adhesion
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Solution Overview
Problem
Current battery technologies face challenges in achieving a strong and long-lasting bond between the current collector and the composite electrode, leading to increased interfacial resistance and capacity fade due to swelling during repeated cycling, especially with poor wettability and adhesion issues.
Innovation Solution
An electron beam-treated current collector with increased surface energy is used, allowing for improved wetting and adhesion with water-soluble binders like carboxymethylcellulose, Xantham gum, or polyvinyl alcohol, which form chemical bonds with hydroxyl groups on the treated surface, reducing contact angles to 70 degrees or less, enhancing the uniformity and stability of the electrode layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional current collectors are used without treatment, then the manufacturing process is simple, but the adhesion between current collector and electrode is poor leading to increased interfacial resistance
Solution Approach 1:
The current collector surface is pre-treated with electron beam irradiation before electrode application to create hydroxyl groups that enhance subsequent binder adhesion. This preliminary surface modification ensures strong bonding without requiring complex multi-step treatments during electrode fabrication.
Solution Approach 2:
The surface energy and chemical composition of the current collector are changed through electron beam irradiation, transforming the surface from hydrophobic to hydrophilic by generating hydroxyl groups. This parameter change enables water-soluble binders to form strong chemical bonds without altering the bulk properties of the current collector.
2Ease of manufacture
If water-soluble binders are used with conventional current collectors, then cost is reduced and environmental friendliness is improved, but wettability and adhesion are insufficient leading to poor electrode uniformity
Solution Approach 1:
The current collector surface is modified through electron beam irradiation to change its chemical properties, creating hydroxyl groups that enable water-soluble binders to wet the surface effectively. This allows low-cost, environmentally friendly binders to achieve uniform electrode coating by forming strong chemical bonds with the treated surface.
3Reliability
If the current collector surface is treated to increase surface energy, then adhesion and wetting are improved, but the treatment process complexity and equipment requirements increase
Solution Approach 1:
The mechanical or chemical surface treatment processes are replaced with electron beam irradiation, which uses electromagnetic energy to directly generate hydroxyl groups on the current collector surface. This substitution eliminates the need for complex mechanical abrasion equipment or chemical solution handling systems while achieving reliable surface modification.
4Strength
If electron beam treatment is applied to increase surface energy, then adhesion with water-soluble binders is improved, but energy consumption and processing time increase
Solution Approach 1:
The electron beam treatment parameters (voltage, current, scanning speed) are optimized to achieve sufficient hydroxyl group generation with minimal energy input. By controlling the beam energy and exposure time, the process creates the necessary surface chemistry for strong binder adhesion while minimizing overall energy consumption compared to alternative treatment methods.
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 electron beam treatment increases the surface energy of the current collector, improving the adhesion and uniformity of the electrode layer, reducing de-wetting and increasing the battery's performance and longevity by forming strong chemical bonds with the binder, making water-soluble binders more viable and cost-effective alternatives.
Implementation Method 1
treating a surface of a current collector with an electron beam
Implementation Method 2
An electron beam-treated current collector with increased surface energy is used
Implementation Method 3
the binder forms chemical bonds with hydroxyl groups on the treated surface of the current collector
Implementation Method 4
improved wetting and adhesion with water-soluble binders like carboxymethylcellulose, Xantham gum, or polyvinyl alcohol, which form chemical bonds with hydroxyl groups
Implementation Method 5
reducing contact angles to 70 degrees or less
Data Source
AI summary
In at least one embodiment, a battery is provided comprising an electron beam-treated current collector having an increased surface energy compared to an untreated current collector and an electrode disposed on a treated surface of the current collector. The electrode may include a water-soluble binder uniformly coating a surface of the current collector and the treated current collector may have a contact angle with the water-soluble binder of 70 degrees or less. The electron beam treatment may be applied to a moving current collector foil as part of a battery production process, prior to application of an electrode slurry.