Magnetic Graphite Alignment for Uniform Battery Anode Coatings
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Solution Overview
Problem
Existing methods struggle to uniformly align the crystal faces of carbon-based negative electrode active materials in negative electrodes due to varying manufacturing conditions, such as slurry thickness and loading amount, making it difficult to optimize magnetic field application for consistent orientation.
Innovation Solution
A magnetic alignment device with adjustable magnet parts and a thickness measuring system controls the separation distance between magnets based on slurry thickness, ensuring uniform alignment of carbon-based negative electrode active materials by applying a magnetic field perpendicular to the electrode current collector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic field is applied to undried negative electrode slurry to orient graphite, then the charging performance of the negative electrode is improved, but the uniformity of graphite orientation deteriorates due to varying slurry thickness and loading amount
Solution Approach 1:
The patent applies a dynamic magnetic field generation system where the magnetic field intensity is adjusted in real-time based on the measured slurry thickness. The magnetic field generating unit receives control signals that modify the magnetic field strength dynamically, ensuring optimal graphite orientation uniformity across different slurry conditions while maintaining improved charging performance
Solution Approach 2:
The patent implements a feedback control mechanism where a sensor detects the actual slurry thickness and feeds this information back to the control unit. The control unit then adjusts the magnetic field generating unit's output accordingly, creating a closed-loop system that maintains uniform graphite orientation despite variations in slurry properties
2Ease of manufacture
If permanent magnets are used for magnetic field application, then the orientation of graphite can be achieved, but the device complexity increases due to difficulty in controlling magnetic field intensity according to different negative electrode specifications
Solution Approach 1:
The patent replaces the static mechanical permanent magnet system with a controllable magnetic field generating unit that can be adjusted electronically. This substitution allows for dynamic control of magnetic field intensity through electrical signals, simplifying the adaptation to different negative electrode specifications while maintaining the graphite orientation capability
Solution Approach 2:
The patent enables continuous adjustment of magnetic field intensity parameters based on the specific requirements of different negative electrode types. By changing the magnetic field strength parameter dynamically rather than using fixed permanent magnets, the system achieves versatility across different specifications without increasing overall device complexity
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 device achieves real-time adjustment of magnetic field intensity, resulting in a uniformly aligned negative electrode active layer with improved lithium ion mobility and reduced resistance, enhancing battery charging and discharging performance.
Implementation Method 1
a magnetic alignment device... capable of uniformly aligning a negative electrode active layer... by adjusting the intensity of a magnetic field... to orient a carbon-based negative electrode active material
Data Source
AI summary
A magnetic alignment device includes a first magnet part and a second magnet part, a thickness measuring part, and a control part. The first and second magnet parts accommodate an electrode sheet therebetween and the thickness measuring part measures a thickness of a negative electrode slurry disposed on the electrode sheet. The control part adjusts the separation distance of the first and second magnet parts. The magnetic alignment device measures the thickness of the negative electrode slurry applied on the negative electrode current collector in real time and controls the intensity of the magnetic field by adjusting the separation distance of the magnet part according to the measured negative electrode slurry thickness, and has an advantage of uniformly high alignment degree of the crystal faces of the carbon-based negative electrode active material contained in prepared negative electrode active layer.