Multi-Layer Battery Electrode With Magnetic Binder Alignment
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Solution Overview
Problem
Existing technologies face challenges in maintaining uniform distribution of solid content, particularly binders, in the electrode slurry during the manufacturing process, leading to adhesion issues between the current collector and the electrode active material layer, which affects battery performance and fast charging capabilities.
Innovation Solution
A fabrication method involving the application of a binder solution with magnetic particles on a current collector, followed by a magnetic field to align the particles, and then applying an electrode slurry, ensuring uniform distribution and improved adhesion through controlled viscosity and magnetic alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a dual-layer electrode slurry with high binder content in lower layer and low binder content in upper layer is formed, then adhesion between current collector and electrode mixture layer is improved, but uniform distribution of binder in lower layer cannot be maintained and lower part liquid is pushed during coating
Solution Approach 1:
Magnetic particles are introduced as intermediary substances in the lower layer binder solution. These particles respond to magnetic fields to control the distribution and stability of the binder solution, preventing liquid displacement while maintaining uniform binder distribution during the coating process.
Solution Approach 2:
The viscosity of the binder solution is dynamically controlled by applying magnetic fields. The magnetic field strength and application timing are adjusted to optimize the viscosity at different stages: during coating to prevent liquid displacement, and after coating to maintain uniform binder distribution. This parameter control allows the system to achieve both good adhesion and uniform composition.
2Strength
If binder content is increased at the current collector interface to suppress detachment, then adhesion is improved, but binder content in electrode mixture layer and surface must be lowered to improve battery performance, creating a complex multi-layer structure
Solution Approach 1:
The invention creates a gradient binder distribution where the lower layer has higher binder content for adhesion at the current collector interface, while the upper layer has lower binder content for optimal electrode performance. This local differentiation of binder concentration allows each region to fulfill its specific function without requiring complex multi-layer structures.
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 method enhances the adhesion between the current collector and electrode active material layer, improving the uniformity of binder distribution and enabling better fast charging performance.
Implementation Method 1
applying a magnetic field to the current collector to which the binder solution is applied
Implementation Method 2
a binder solution including magnetic particles on a current collector; applying a magnetic field to the current collector to which the binder solution is applied
Data Source
AI summary
A fabrication method of a multi-layered electrode for a battery includes (a) applying a binder solution including magnetic particles on a current collector, (b) applying a magnetic field to the current collector to which the binder solution is applied, and (c) applying an electrode slurry including an electrode active material on the binder solution.