Wet Electrode Coating with Insulating Particle Paint
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Solution Overview
Problem
The existing methods for producing battery electrode bodies with insulating particle layers face issues with wettability of insulating particle paint on electrode active material layers, leading to coating defects and non-uniform thickness, which affects the quality of the electrode body.
Innovation Solution
A method involving the application of an insulating particle paint with a specific weight ratio of solid and liquid components onto an electrode active material layer in a wet state, ensuring a favorable surface tension ratio and contact angle to enhance wettability and achieve a uniform insulating particle layer between positive and negative electrode plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If insulating particle paint is applied to a dried electrode active material layer, then the coating process can be simplified, but the wettability becomes poor and coating defects occur
Solution Approach 1:
The electrode active material layer is kept in a wet state before applying the insulating particle paint, which preliminarily prepares the surface for better wettability. This preliminary action of maintaining moisture enables the paint to spread uniformly without defects, resolving the contradiction between process simplicity and coating quality.
Solution Approach 2:
The surface tension of the liquid phase component in the insulating particle paint is adjusted to be within 90-110% of the surface tension of the liquid phase component in the electrode active material layer. This parameter change optimizes the wettability and contact angle, enabling uniform coating while maintaining process simplicity.
2Quantity of substance
If insulating particle paint with high solid content is used, then the insulating particle layer thickness increases, but the wettability and coating uniformity deteriorate
Solution Approach 1:
The solid content of the insulating particle paint is precisely controlled within 35-50%, and the surface tension of the liquid phase component is adjusted to match the substrate. This parameter optimization enables the paint to maintain both sufficient thickness and excellent wettability, achieving uniform coating without defects.
3Manufacturing precision
If the liquid phase component has low surface tension, then the wettability improves, but the paint may spread too much and lose control
Solution Approach 1:
The surface tension of the liquid phase component in the insulating particle paint is precisely controlled within 90-110% of the surface tension of the liquid phase component in the electrode active material layer. This narrow range optimization balances wettability improvement with controlled spreading, achieving uniform coating with well-defined boundaries.
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 approach results in a high-quality electrode body with a uniform insulating particle layer, reducing defects and maintaining the stability of the electrode body shape, even without a film separator between the plates.
Implementation Method 1
a surface tension value of the first liquid phase component is in a range of 90 to 110% of a surface tension value of the second liquid phase component
Implementation Method 2
the wettability of an insulating particle paint when the insulating particle paint is applied to an electrode plate is not favorable
Implementation Method 3
affinity between the liquid phase components is favorable
Data Source
AI summary
A method of producing an electrode body includes obtaining a state in which an electrode active material layer in a wet state which includes a first solid component containing electrode active material particles and a first liquid phase component and which includes the first solid component at a weight ratio in a range of 70 to 85% is present on the collecting foil, and applying an insulating particle paint which includes a second solid component containing insulating particles and a second liquid phase component and which includes the second solid component at a weight ratio in a range of 35 to 50% onto the electrode active material layer in the wet state, wherein a surface tension value of the first liquid phase component is in a range of 90 to 110% of a surface tension value of the second liquid phase component.