Secondary Battery Electrode Lamination Under High-Pressure Pressing
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Solution Overview
Problem
The existing methods for producing secondary battery electrodes, particularly those requiring high pressing forces, often result in creases and breakages in the current collector due to differences in extension lengths between coated and uncoated parts, leading to processing defects and reduced mechanical strength.
Innovation Solution
A method for producing a secondary battery electrode that involves preparing a powdery electrode material with an electrode active substance and a binder, forming the electrode active substance layer without a current collector present, pressing the layer with a linear pressure of 1 ton/cm or more, coating an adhesive liquid on the current collector, and then bonding the electrode active substance layer to the current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high pressing force (linear pressure of 1 ton/cm or more) is applied to increase electrode packing ratio, then energy density is improved, but creases and breakages occur in the current collector
Solution Approach 1:
The current collector is pre-coated with adhesive liquid before the electrode active substance layer is formed and pressed. This preliminary bonding prevents the current collector from moving or deforming during the high-pressure pressing process, thereby preventing creases and breakages while still achieving high electrode packing ratio.
2Quantity of substance
If high pressing force is applied to increase electrode packing ratio, then energy density is improved, but processing defects increase
Solution Approach 1:
The adhesive coating is applied in advance to the current collector before electrode formation and pressing. This preliminary action secures the electrode material to the current collector, preventing displacement and deformation during high-pressure pressing, thus maintaining high manufacturing precision while achieving high packing ratio.
3Reliability
If adhesive liquid is coated on current collector before pressing, then creases and breakages are prevented, but electrode packing ratio may be reduced
Solution Approach 1:
The pressing process is optimized by adjusting pressing pressure, pressing temperature, and pressing time parameters. This allows sufficient electrode material to be packed onto the adhesive-coated current collector, achieving high electrode packing ratio while the adhesive prevents creases and breakages during the pressing operation.
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 effectively increases the electrode packing ratio while preventing creases and breakages in the current collector, resulting in a high-quality electrode with improved mechanical strength and processing reliability.
Implementation Method 1
a step for coating an adhesive liquid containing at least an adhesive resin on the electrode current collector; and a step for supplying the electrode active substance layer to the current collector on which the adhesive liquid has been coated so as to construct an electrode
Data Source
AI summary
The method for producing an electrode disclosed here is a method for producing an electrode having an electrode current collector and an electrode active substance layer, and includes the following steps: a step for preparing a powdery electrode material containing at least an electrode active substance and a binder; a step for passing the electrode material between a pair of opposing rollers so as to form the electrode active substance layer comprising the electrode material; a step for pressing the electrode active substance layer, wherein the pressing comprises pressing at a linear pressure of 1 ton/cm or more; a step for coating an adhesive liquid containing at least an adhesive resin on the electrode current collector; and a step for supplying the electrode active substance layer to the current collector on which the adhesive liquid has been coated so as to construct an electrode.