Negative Electrode Capacity Area Density for Quick-Charge Battery Design
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Solution Overview
Problem
Batteries face challenges in achieving a balance between high energy density and quick-charge cycle performance, with existing designs often compromising on either initial capacity or quick-charge performance, and there is a lack of a standardized method to compare capacity across different battery sizes.
Innovation Solution
The battery design incorporates a negative electrode with a high capacity area density and a specific capacity area density in the gap, combined with solid particles in the electrolyte, to optimize ion diffusion and maintain performance across various active materials, ensuring high energy density and excellent quick-charge cycle properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the negative electrode active material layer is made thicker to increase capacity, then the energy density is improved, but the quick-charge cycle performance deteriorates due to insufficient ion diffusion
Solution Approach 1:
The patent applies local quality by creating two distinct regions within the negative electrode active material layer: a first region with capacity area density of 2.2-10 mAh/cm² and a second region with capacity area density of 10-20 mAh/cm². This spatial differentiation allows the thinner first region to facilitate rapid ion diffusion for quick charging while the thicker second region provides high capacity for energy density, thereby resolving the contradiction between thick electrode design and quick-charge performance.
2Quantity of substance
If the battery is designed for high initial capacity, then the energy density is improved, but the quick-charge cycle properties worsen due to ion diffusion limitations
Solution Approach 1:
The patent segments the negative electrode active material layer into two functional regions with different capacity area densities. The first region (2.2-10 mAh/cm²) serves as an ion diffusion-friendly zone that maintains quick-charge cycle reliability, while the second region (10-20 mAh/cm²) contributes to high initial capacity. This segmentation allows the battery to achieve both high initial capacity and excellent quick-charge cycle properties simultaneously.
3Adaptability or versatility
If a standardized comparison method is not established, then flexibility in design is maintained, but the ability to compare capacity across different battery sizes is lost
Solution Approach 1:
The patent introduces the capacity area density parameter (mAh/cm²) as a standardized metric to evaluate and compare battery performance across different sizes and designs. By defining specific ranges for the first region (2.2-10 mAh/cm²) and second region (10-20 mAh/cm²), the invention enables precise comparison of quick-charge cycle properties and energy density while maintaining design flexibility through the adjustable two-region structure.
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 allows for a battery that maintains high capacity after repeated quick charging, regardless of active material type, improving both energy density and quick-charge performance while stabilizing energy density levels.
Implementation Method 1
the electrolyte contains a solid particle... optimize ion diffusion
Data Source
AI summary
A battery includes a positive electrode formed with a positive electrode active material layer containing a positive electrode active material at least on one side of a positive electrode current collector, a negative electrode formed with a negative electrode active material layer containing a negative electrode active material at least on one side of a negative electrode current collector, a separator, and an electrolyte containing solid particles. The capacity area density (mAh/cm2) of the negative electrode active material layer is equal to or higher than 2.2 mAh/cm2 and equal to or lower than 10 mAh/cm2, and the capacity area density (mAh/cm2) of a gap in the negative electrode active material layer is equal to or higher than 5.9 mAh/cm2 and equal to or lower than 67 mAh/cm2.