Electrode Separator Composite Bonding Without Thermal Lamination
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Solution Overview
Problem
The existing methods for producing electrode separator composites in lithium-ion batteries are inefficient due to high energy costs, thermal loads, and limited productivity, primarily because they rely on lamination processes that require heat and pressure, and use costly adhesion-promoting layers.
Innovation Solution
A method using plasma treatment to form covalent bonds between electrode and separator layers, allowing for a continuous process at room temperature without the need for adhesion-promoting layers, and enabling the use of thermally unstable materials, with optional additional plasma treatment for enhanced bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a lamination process with heat and pressure is used to join electrode layers and separator layers, then adhesive bond strength is improved, but energy consumption increases and productivity decreases
Solution Approach 1:
The patent replaces the thermal-mechanical lamination system (heat and pressure) with a plasma treatment system. The plasma activates the surfaces of electrode and separator layers, enabling covalent bonding without requiring high temperature or pressure, thus dramatically reducing energy consumption while maintaining bond strength.
Solution Approach 2:
The patent changes the bonding mechanism from thermal-mechanical to plasma-chemical. By using plasma treatment, the bonding process occurs at room temperature with minimal pressure, fundamentally altering the process parameters from high-energy thermal conditions to low-energy plasma conditions, thereby reducing energy consumption.
2Strength
If a lamination process with heat and pressure is used to join electrode layers and separator layers, then adhesive bond strength is improved, but productivity decreases
Solution Approach 1:
The patent replaces the slow thermal-mechanical lamination process with a faster plasma treatment process. The plasma activation and bonding occur rapidly without the need to heat and cool large masses, significantly reducing cycle time and increasing productivity while maintaining bond strength.
3Strength
If adhesion-promoting layers are used in the lamination process, then bonding between layers is improved, but production costs increase
Solution Approach 1:
The patent extracts and eliminates the adhesion-promoting layers from the structure. Instead of adding extra material layers for bonding, the invention uses plasma treatment to activate the existing surfaces of electrode and separator layers, enabling direct bonding without additional cost-intensive adhesive layers.
Solution Approach 2:
The patent enables the electrode and separator layers to bond to each other directly through plasma activation. The surfaces of the layers themselves serve as the bonding interface, eliminating the need for separate adhesion-promoting layers and reducing material costs.
4Strength
If a lamination process is used, then bonding between layers is achieved, but thermal loads on materials increase which limits material selection
Solution Approach 1:
The patent changes the bonding process from high-temperature lamination to room-temperature plasma treatment. This parameter change enables the use of thermally unstable materials that would decompose or deform under lamination conditions, vastly expanding material selection flexibility while maintaining bonding 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
This approach significantly reduces energy consumption, eliminates the need for costly adhesion layers, and increases productivity by enabling the use of more economical materials while allowing for flexible cell structures and efficient stacking processes.
Implementation Method 1
the joining process involves a plasma treatment in which there is surface activation of the electrode layers and/or separator layers, using plasma
Implementation Method 2
surface activation of the electrode layers and/or separator layers, using plasma
Implementation Method 3
an increased chemical adhesive bond is provided, preferably by means of covalent bonds
Data Source
AI summary
A method for producing an electrode separator composite, which is a component of an electrode separator stack for a battery cell, and which electrode separator composite is formed of at least one electrode layer and at least one separator layer. The method comprises the following steps: a laying process, in which the electrode and separator layers are laid on top of one another; and a joining process, with which an adhesive connection is formed between the electrode and separator layers laid on top of one another. The joining process involves a plasma treatment, in which there is a surface activation of the electrode and/or separator layers using plasma, such that an adhesive connection is provided between the respective joining partners.