Flat Plate Silicate Electrode Coating Curvature Control
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Solution Overview
Problem
The existing methods for forming electrodes using active material-containing layers on current collectors often result in curvature issues, leading to cracks and non-uniform coatings, which complicates the production of high-quality electrodes and reduces productivity.
Innovation Solution
Incorporating a flat plate-shaped silicate as a thickening agent in the slurry, which suppresses curvature and enhances the uniformity of the active material-containing layer, thereby improving the electrode's internal resistance and cycle life properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a slurry is applied onto one surface of a current collector to prepare a one-side electrode, then the electrode structure is simplified, but the coating film contracts and curves during drying, causing cracks and non-uniform coating
Solution Approach 1:
The invention changes the physical-chemical parameters of the slurry by adding a thickening agent, which modifies the viscosity and drying characteristics of the coating film. This parameter change prevents the coating film from contracting excessively during drying, thereby maintaining coating uniformity and preventing cracks while preserving the simplified one-side electrode structure
Solution Approach 2:
The thickening agent acts as an intermediary substance between the slurry components and the current collector. It modifies the interaction between the coating film and the substrate during the drying process, preventing the film from shrinking and curving, thus ensuring uniform coating without compromising the electrode structure simplicity
2Shape
If the one-side electrode curves during drying, then the electrode structure forms, but cracks are generated in the active material-containing layer and uniform electrode cannot be obtained
Solution Approach 1:
By adding a thickening agent to the slurry, the invention changes the rheological parameters of the coating film during drying. This modification maintains the structural integrity of the electrode by preventing excessive contraction, thereby avoiding cracks and ensuring high electrode quality without compromising the desired electrode shape
3Shape
If the one-side electrode curves, then the electrode is formed, but multiple-zone coating becomes difficult and productivity is lowered
Solution Approach 1:
The invention modifies the drying characteristics of the coating film by incorporating a thickening agent, which prevents the film from curving during drying. This parameter change ensures that the electrode remains flat and stable, enabling easy application of multiple-zone coatings and maintaining high coating efficiency and productivity
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
The use of flat plate-shaped silicates ensures a uniform and stable active material-containing layer, reducing curvature and peeling issues, resulting in electrodes with improved internal resistance and extended cycle life, facilitating the production of high-quality secondary batteries.
Implementation Method 1
when the coating film is dried, the coating film may contract and curve with the current collector
Data Source
AI summary
According to one embodiment, an electrode is provided. The electrode includes an active material-containing layer. The active material-containing layer contains an active material and a flat plate-shaped silicate.