Lithium-Ion Battery Anode Groove Layout for Faster Electrolyte Impregnation
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Solution Overview
Problem
In lithium ion batteries, the impregnation time of the electrolytic solution into the power storage element is prolonged due to the thickness of the active material layer, which can lead to reduced discharge capacity and increased resistance.
Innovation Solution
A lithium ion battery configuration is introduced, where the negative electrode active material layer includes alternating first and second regions with different thicknesses and compositions, with the second region acting as a groove to enhance electrolytic solution flow and reduce Li deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the active material layer is made thicker to increase capacity, then the discharge capacity increases, but the impregnation time of the electrolytic solution becomes longer
Solution Approach 1:
The negative electrode active material layer is segmented into multiple regions with different thicknesses. Thinner regions (first regions) are provided in areas where electrolytic solution impregnation is difficult, while thicker regions (second regions) are provided in areas where longer impregnation time is acceptable. This segmentation allows the electrolytic solution to penetrate the layer more efficiently while still achieving the desired overall capacity.
2Quantity of substance
If the active material layer is made thicker to increase capacity, then the discharge capacity increases, but the resistance increases
Solution Approach 1:
Different regions of the negative electrode active material layer are given different local qualities in terms of thickness. The thinner first regions reduce the resistance and facilitate electrolytic solution penetration, while the thicker second regions contribute to the overall capacity. This local differentiation allows the layer to achieve both low resistance and high capacity.
3Loss of time
If the positive electrode active material layer volume is reduced to provide a groove, then the impregnation time is shortened, but the design capacity is reduced
Solution Approach 1:
Instead of providing a groove in the positive electrode active material layer (which would reduce its volume and capacity), the invention inverts the approach by providing the groove in the negative electrode active material layer. This allows the positive electrode to maintain its full volume and design capacity while still achieving shortened impregnation time through the groove structure in the negative electrode.
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 configuration significantly shortens the impregnation time, maintains the design capacity, and avoids the reduction in positive electrode active material layer volume, thereby improving the battery's performance and efficiency.
Implementation Method 1
When the groove forms a flow path for the electrolytic solution, it is expected to shorten the impregnation time
Implementation Method 2
an electrolytic solution is impregnated into a power storage element
Data Source
AI summary
The lithium ion battery includes a positive electrode active material layer, a negative electrode active material layer, and an electrolytic solution. The negative electrode active material layer includes a first region and a second region. The first region and the second region are alternately arranged in a direction orthogonal to the thickness direction of the negative electrode active material layer. The negative electrode active material layer includes a first active material and a second active material. The second active material has a larger specific capacity than the first active material. The relation between “T2<T1” and “R1<R2” is satisfied. T1 indicates the thickness of the first region during discharging. T2 indicates the thickness of the second region during discharging. R1 indicates a ratio of the mass of the second active material to the total mass of the first active material and the second active material.