Segmented Electrode Structure to Prevent Coating Delamination
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Solution Overview
Problem
Secondary battery electrodes experience bending, delamination, and cracking phenomena during manufacturing due to tension applied to the electrode active material during winding and cutting processes.
Innovation Solution
The electrode design features a base collector with unit electrodes of a metal material, each with a smaller size and shape, arranged in columns and rows on the base collector, and an electrode active material applied to the unit collectors, preventing tension-induced delamination and cracking by avoiding direct application of tension during the winding and cutting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrode is wound on a roll for transfer and storage, then the electrode can be conveniently transferred and stored, but the electrode active material coating bends and delaminates or cracks at the winding part
Solution Approach 1:
The electrode is divided into multiple unit electrodes that are arranged in columns and rows on the base collector. Each unit electrode is a separate entity with its own active material coating, which prevents the bending and cracking that occurs in continuous rolled electrodes during winding and unwinding operations.
2Adaptability or versatility
If the electrode is cut after applying the electrode active material, then the electrode can be manufactured in specific shapes, but the electrode active material delaminates during the cutting process
Solution Approach 1:
The unit electrodes are manufactured and their active materials are applied in advance before attachment to the base collector. This preliminary formation of complete unit electrodes with intact active material coatings allows subsequent cutting and arrangement without causing delamination, as the active material is already securely bonded to its substrate.
3Productivity
If the electrode active material is applied on the entire base collector, then the electrode can be manufactured efficiently, but the bending and delamination phenomena occur during winding
Solution Approach 1:
Instead of applying active material across the entire base collector in one continuous process, the invention segments the electrode into multiple unit electrodes. Each unit electrode is manufactured separately with its own active material coating, which maintains coating quality and prevents bending issues while still achieving efficient production through parallel manufacturing of multiple units.
Data Source
AI summary
The present invention relates to an electrode and a method for manufacturing the electrode, and more particularly, to an electrode capable of preventing a bending phenomenon of an electrode active material coating or a delamination or cracking phenomenon of an electrode active material from occurring and a method for manufacturing the electrode.The electrode according to the present invention includes a base collector made of a metal material and a unit electrode attached to the base collector, wherein the unit electrode includes a unit collector made of a metal material and having a size less than that of the base collector and an electrode active material applied on one surface of the unit collector.