Battery Electrode Coating Layout for Faster Electrolyte Impregnation
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Solution Overview
Problem
Existing secondary battery manufacturing methods face challenges with reduced electrolyte impregnation properties due to high rolling pressures, leading to slow electrolyte penetration and decreased battery performance and productivity.
Innovation Solution
A method involving multiple coating layers with varying active material densities and electrolyte impregnation properties is applied to the current collector, where a first coating layer is followed by a second coating layer spaced at intervals, and then rolled to form regions with different active material densities and impregnation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode is rolled under high pressure to increase density, then the capacity of the secondary battery is improved, but the electrolyte impregnation property is reduced
Solution Approach 1:
The electrode is divided into multiple regions with different rolling pressures: a first region rolled at first rolling pressure and a second region rolled at second rolling pressure (higher than the first). This segmentation allows different parts of the electrode to have different densities and electrolyte impregnation properties, resolving the contradiction between capacity and impregnation quality.
Solution Approach 2:
Different regions of the electrode are given different local properties through selective rolling pressures. The first region has lower density but better electrolyte impregnation, while the second region has higher density for increased capacity. This local differentiation allows the electrode to simultaneously achieve good impregnation and high capacity.
2Quantity of substance
If the electrode is rolled under high pressure to increase density, then the capacity of the secondary battery is improved, but the impregnation speed is reduced
Solution Approach 1:
The electrode surface is segmented into regions with different rolling pressures, creating a gradient structure where some areas maintain higher porosity for faster electrolyte penetration while other areas are densely packed for high capacity.
Solution Approach 2:
The problem is solved by introducing a spatial dimension to the rolling pressure application - instead of uniform pressure, different pressures are applied to different spatial regions of the electrode, creating a multi-zone structure that simultaneously optimizes both impregnation speed and capacity.
3Quantity of substance
If the electrode is rolled under high pressure to increase density, then the capacity of the secondary battery is improved, but the productivity is deteriorated
Solution Approach 1:
The electrode manufacturing process is segmented into different rolling zones with different pressure levels. This allows the electrode to achieve high overall capacity while maintaining regions that facilitate rapid electrolyte impregnation, thereby improving manufacturing 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
This approach enhances electrolyte impregnation speed and capacity, improving battery performance and productivity by ensuring faster lithium ion movement and higher active material density in specific regions.
Implementation Method 1
applying a first coating layer comprising an active material to at least one surface of a current collector comprising a metal material, applying a plurality of second coating layer comprising the active material to at least one surface of the first coating layer
Implementation Method 2
rolling the current collector, the first coating layer, and the second coating layer by a rolling device
Implementation Method 3
If the electrolyte impregnation property is low, an electrolyte may not quickly reach electrode active material particles
Data Source
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AI summary
A method for manufacturing an electrode according to an embodiment of the present invention may include applying a first coating layer comprising an active material to at least one surface of a current collector comprising a metal material, applying a plurality of second coating layer comprising the active material to at least one surface of the first coating layer, and rolling the current collector, the first coating layer, and the second coating layer by a rolling device.