Lithium-Ion Electrode Trimming to Prevent Calendering Deformation
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Solution Overview
Problem
Existing methods for producing electrodes for energy storage cells, such as lithium ion batteries, often result in undesired deformations like folds and cracks due to force application during calendering, making further processing difficult and costly.
Innovation Solution
A method involving coating a carrier material on one or both sides with a compound comprising active material, electrode binder, and conductive carbon black, followed by trimming to the cell footprint before adjusting porosity, using mechanical or thermal cutting, and rolling in different directions to avoid mechanical stress and achieve higher electrode density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the carrier material is compacted during calendering to adjust porosity, then the porosity of the electrode is adjusted, but undesired deformations such as folds and cracks occur in the uncoated regions
Solution Approach 1:
The carrier material is trimmed to the final cell footprint dimensions before the calendering process. This preliminary action removes the vulnerable uncoated edge regions that would otherwise deform during compaction, allowing the subsequent porosity adjustment to proceed without generating folds or cracks.
Solution Approach 2:
The manufacturing process is segmented into distinct sequential steps: first coating the carrier material, then trimming to final dimensions, and finally compacting. This segmentation allows each operation to be optimized independently, with the trimming step preparing the material for the compaction step without interference from uncoated regions.
2Object-affected harmful factors
If heating of the uncoated regions is applied to counteract deformations, then deformation problems are reduced, but the manufacturing process becomes more elaborate and cost-intensive
Solution Approach 1:
The problematic uncoated regions are completely removed from the carrier material through trimming to the final cell footprint before calendering. By extracting these vulnerable regions beforehand, the need for additional heating or protective measures during compaction is eliminated, simplifying the overall manufacturing process.
3Object-affected harmful factors
If the carrier material is trimmed after coating but before compaction, then deformation issues are avoided, but the processing sequence becomes different from conventional methods
Solution Approach 1:
Trimming is performed as a preliminary action before the compaction step, establishing the final dimensions of the electrode while the material is still in its coated but uncompact ed state. This sequence prevents deformation during compaction and simplifies subsequent processing steps.
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 prevents deformation issues, allows for clean cutting edges, and achieves higher electrode density, resulting in increased power and energy densities with reduced manufacturing complexity and cost.
Implementation Method 1
coating a carrier material in order to produce or generate an electrode, in particular with a coating compound
Implementation Method 2
adjusting the porosity of the electrode on the single sheet
Data Source
AI summary
A method for producing an electrode, especially for a lithium-ion battery, includes coating a carrier material, machining the carrier material to produce at least one single sheet, and adjusting the porosity of the electrode at the single sheet level.