Lithium-Ion Electrode Coating Flexibility via Electrolyte Contact
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Solution Overview
Problem
The brittle nature of electrochemically active coatings in lithium-ion cells leads to cracks and detachment during the winding or cutting processes, resulting in a loss of active material and reduced battery life, and the use of plasticizers to improve flexibility comes with drawbacks such as reduced energy density and toxic byproducts.
Innovation Solution
A method involving the application of an electrochemically active coating on electrodes, followed by contacting with an electrolyte to enhance flexibility, allowing for continuous processing without plasticizers, which includes unwinding, coating, electrolyte application, and subsequent winding or cutting of electrodes to form lithium-ion cells with high energy density and extended lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If plasticizers are added to improve electrode flexibility, then electrode flexibility is improved, but energy density is reduced and toxic byproducts are generated
Solution Approach 1:
The invention extracts and removes plasticizers from the electrode coating formulation entirely. Instead of using plasticizers to achieve flexibility, the patent formulates the electrochemically active coating without any plasticizer additives, thereby eliminating the trade-off between flexibility and energy density while avoiding toxic byproduct generation during processing.
2Quantity of substance
If electrochemically active coating is made brittle to maintain high energy density, then energy density is maintained, but cracks and detachment occur during winding or cutting
Solution Approach 1:
The invention changes the formulation parameters of the electrochemically active coating by selecting binder and active material combinations that inherently provide flexibility without requiring plasticizers. This parameter change allows the coating to maintain both high energy density and sufficient flexibility to prevent cracks and detachment during mechanical processing.
3Reliability
If plasticizers are used to prevent cracks during winding, then electrode integrity is improved, but production costs increase due to additional processing steps
Solution Approach 1:
The invention removes the need for plasticizer addition and subsequent removal steps from the manufacturing process. By formulating the coating without plasticizers, the process is simplified to eliminate extra processing steps, reducing production costs while maintaining electrode integrity through the inherent properties of the plasticizer-free formulation.
4Ease of manufacture
If plasticizers are added to improve flexibility, then electrode processability is improved, but toxic byproducts are generated requiring safety precautions
Solution Approach 1:
The invention converts the harmful effect of plasticizer decomposition into a benefit by completely eliminating plasticizers from the formulation. This approach avoids the generation of toxic byproducts such as dibutyl phthalate decomposition products, making the manufacturing process safer and eliminating the need for enhanced safety precautions while maintaining electrode processability.
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 method ensures the electrodes can be processed without damage, maintaining high energy density and extending battery life by eliminating the need for plasticizers and reducing production costs, while ensuring operational reliability and homogeneity.
Implementation Method 1
contacting with an electrolyte to enhance flexibility
Data Source
AI summary
A method for producing a lithium-ion cell is provided. The electrochemically active coating of an electrode is brought into contact with an electrolyte or an auxiliary liquid before a winding or cutting operation. This method is suitable in particular for continuously producing lithium-ion cells by means of processes proceeding at high speed, such as winding processes.