Atmospheric Plasma Polymer Coating for Low-Resistance Battery Electrodes
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Solution Overview
Problem
Current methods for producing adhesion-promoting layers on metallic electrodes in batteries fail to achieve high adhesive strength and low contact resistance, leading to instability and aging issues during discharge-charge cycles.
Innovation Solution
An atmospheric pressure plasma process is used to deposit a plasma-polymer layer on metallic substrates by feeding organic precursor compounds into the relaxing region of the plasma, resulting in a layer with conjugated multiple bonds that enhances adhesion and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cleaning and chemical treatment methods are used, then the metal surface is prepared for coating, but the adhesion strength and electrical conductivity remain insufficient
Solution Approach 1:
The invention changes the physical and chemical parameters of the metal surface by applying plasma treatment with specific power densities and exposure times. This modifies the surface energy, roughness, and oxidation state of the metal, creating optimal conditions for both adhesion and electrical conductivity without requiring additional chemical treatments
Solution Approach 2:
The invention creates a composite surface structure through plasma treatment that combines metallic properties with plasma-induced surface modifications. The plasma-treated surface forms a composite layer with enhanced adhesion properties while maintaining electrical conductivity, effectively combining the benefits of both metal and plasma-modified surface characteristics
2Quantity of substance
If thick active material layers are applied to increase capacity, then the energy storage increases, but the contact resistance increases and adhesion deteriorates
Solution Approach 1:
The invention performs preliminary plasma treatment of the metal substrate before applying the active material layer. This preliminary action creates an optimized surface that enhances adhesion and reduces contact resistance, allowing thicker active material layers to be applied without compromising electrical contact or adhesion strength
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 process produces a plasma-polymer layer with high adhesive strength and low contact resistance, ensuring cycle stability and preventing electrode aging by maintaining good adhesion and conductivity.
Implementation Method 1
an atmospheric pressure plasma process for depositing such layers on a metallic substrate... the introduction of organic precursor compounds into the relaxing region of an atmospheric-pressure plasma enables the deposition of a, preferably organic, plasma-polymer layer
Implementation Method 2
the plasma-polymer layer which, due to its good conductivity and low contact resistance, is particularly suitable for electrodes in batteries and accumulators... the layer has good adhesion properties
Data Source
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AI summary
The invention relates to a method for depositing a plasma polymer layer in an atmospheric-pressure plasma on a metallic substrate, the plasma being obtained by a discharge between two electrodes. The invention is characterised in that at least one organic coating precursor compound is fed into the region of the relaxing plasma and is deposited on the metallic substrate as a plasma polymer layer. Nitrogen or forming gas is used as treatment gas and the at least one organic coating precursor compound is selected from the group comprising heterocyclic compounds, cyclic non-functionalized hydrocarbon and hydrocarbon with at least one functional group. The invention also relates to an article, an electrode and a capacitor which respectively comprise a metallic substrate having a surface and a plasma polymer layer on the surface. The invention further relates to a method for producing the electrode, to a method for producing the capacitor and a battery cell and a lithium-ion accumulator which comprises the electrode.