Lithium-Doped Negative Electrode Through-Holes for Cycle Life
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Solution Overview
Problem
Hybrid capacitors exhibit poor cycle characteristics, and organic electrolytic capacitors have low energy density, making it difficult to improve both simultaneously.
Innovation Solution
A power storage device negative electrode with through-holes in the current collector and active material layer, allowing for lithium doping and optimized material composition, along with a manufacturing process that includes lithium pre-doping and a specific electrode assembly structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a power storage device is charged at high speed, then charging time is reduced, but heat generation increases causing safety issues and reduced lifespan
Solution Approach 1:
A cooling device is introduced as an intermediary between the power storage element and the charging system. This cooling device actively removes heat generated during high-speed charging, enabling fast charging rates while preventing excessive temperature rise that would compromise safety or lifespan. The cooling system acts as a mediator that decouples the relationship between charging speed and temperature increase.
2Device complexity
If the power storage device structure is simplified, then manufacturing cost is reduced, but sealing performance deteriorates allowing battery liquid leakage
Solution Approach 1:
The sealing ring is integrated directly into the cap structure, forming a unified component rather than a separate part. This merging of the cap and sealing ring simplifies the overall structure by reducing the number of discrete components and assembly steps, while the sealing ring material and design ensure adequate sealing performance to prevent battery liquid leakage.
3Volume of moving object
If the power storage device is made smaller, then device size is reduced, but heat dissipation capability is insufficient leading to temperature control issues
Solution Approach 1:
A thin-film cooling device is employed that provides effective heat dissipation in a minimal space. The thin-film design allows the cooling functionality to be integrated into the compact device structure without significantly increasing overall size, enabling adequate heat dissipation capability while maintaining small device dimensions.
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 solution results in a power storage device with high energy density and improved cycle characteristics, enhancing the performance of lithium ion capacitors and rechargeable batteries.
Implementation Method 1
a cooling device is provided in said cap... capable of cooling the power storage element
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A power storage device includes: an electrode assembly, including a positive electrode, a separator, and a negative electrode; and an electrolyte solution. The negative electrode includes a negative electrode current collector, and a negative electrode active material layer formed on a surface of the negative electrode current collector. The negative electrode is doped with lithium. The power storage device includes first through-holes penetrating the negative electrode current collector in a thickness direction thereof. On at least one side of the negative electrode current collector, the power storage device includes second through-holes penetrating the negative electrode active material layer in a thickness direction thereof. An aperture ratio of the first through-holes on the negative electrode current collector, or an aperture ratio of the second through-holes on the negative electrode active material layer is 0.001% or higher and 1% or lower.