Electrode Coating Composition for Higher Peel Strength in Batteries
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Solution Overview
Problem
The adhesion between the current collector and the electrode layer in electrochemical devices is inadequate, affecting the performance of batteries and capacitors.
Innovation Solution
Incorporating a coating layer on the current collector with conductive carbon and a first binder made of aromatic super engineering plastic, and an electrode layer with a second binder containing a styrenic elastomer with a mole fraction of styrene repeating units of 0.18 or more, enhancing the interaction between the layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating layer containing polyimide is used on the current collector, then adhesion between current collector and electrode layer is enhanced, but peel strength is still insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the binder materials. Specifically, it uses a binder containing a styrenic elastomer with a mole fraction of styrene repeating units of 0.18 or more in the electrode layer, and a binder containing an aromatic super engineering plastic in the coating layer. This parameter change in molecular structure and composition resolves the adhesion issue by enabling stronger interfacial bonding while maintaining peel strength.
Solution Approach 2:
The patent employs composite material strategy by combining conductive carbon with specific binder materials (styrenic elastomer and aromatic super engineering plastic) in the coating layer and electrode layer respectively. This composite structure creates synergistic effects where the aromatic rings in both binder systems form strong intermolecular interactions across the interface, simultaneously improving adhesion and peel strength without compromising other properties.
2Reliability
If adhesion between current collector and electrode layer is improved, then battery performance is enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent simplifies the system by focusing on changing key compositional parameters rather than adding complex structural elements. By specifying the mole fraction of styrene repeating units (≥0.18) and using aromatic super engineering plastics, the invention achieves improved battery performance through controlled material composition rather than complex multi-layer structures, thus enhancing performance while avoiding excessive manufacturing complexity.
3Duration of action of stationary object
If peel strength is enhanced through material composition, then cycle characteristics improve, but electrical resistance may increase
Solution Approach 1:
The patent uses composite materials strategy by combining conductive carbon with the aromatic super engineering plastic binder in the coating layer. The conductive carbon provides electrical conductivity pathways, while the aromatic binder ensures strong adhesion and durability. This composite approach allows the system to achieve both low electrical resistance (through carbon conductivity) and excellent cycle characteristics (through strong interfacial bonding from the aromatic binder).
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
This configuration significantly improves the peel strength between the electrode layer and the current collector, leading to enhanced cycle characteristics and energy density in batteries, while maintaining high productivity and reducing electrical resistance.
Implementation Method 1
the first binder includes an aromatic super engineering plastic, and the second binder includes a styrenic elastomer in which a mole fraction of a repeating unit derived from styrene is 0.18 or more
Data Source
AI summary
An electrode plate according to the present disclosure includes: a current collector, the current collector including a substrate and a coating layer coating the substrate; and an electrode layer disposed on the current collector, wherein the coating layer includes conductive carbon and a first binder, the electrode layer includes a second binder, the first binder includes an aromatic super engineering plastic, and the second binder includes a styrenic elastomer in which a mole fraction of a repeating unit derived from styrene is 0.18 or more.