Grooved Battery Electrode Structure for Electrolyte Retention
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Solution Overview
Problem
Insufficient electrolyte solution permeation and excessive ejection during charge and discharge cycles lead to decreased cycling performance in secondary batteries.
Innovation Solution
The electrode design incorporates grooves with varying cross-sectional areas, featuring a first region with a larger area and a second region with a smaller area, acting as a weir to facilitate electrolyte solution permeation while inhibiting ejection, utilizing the Darcy-Weisbach equation to optimize pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a groove is formed in the active material layer to facilitate electrolyte solution permeation, then permeation is improved, but ejection during expansion is facilitated leading to exhaustion and decreased cycling performance
Solution Approach 1:
The groove is designed with non-uniform cross-sectional area along its length, creating different local properties: the first region has a larger cross-sectional area to facilitate electrolyte solution permeation, while the second region has a smaller cross-sectional area to inhibit ejection during expansion. This local quality variation allows the single groove structure to simultaneously achieve both permeation facilitation and ejection prevention.
2Ease of manufacture
If the groove cross-sectional area is constant, then manufacturing is simpler, but pressure loss varies excessively during volume changes
Solution Approach 1:
The groove cross-sectional area parameter is changed along its length rather than remaining constant. The first region has a larger cross-sectional area to reduce pressure loss during permeation, while the second region has a smaller cross-sectional area to control ejection. This parameter variation optimizes pressure loss characteristics during active material layer volume changes while remaining manufacturable.
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
Enhances electrolyte solution permeation and retention, improving cycling performance by minimizing pressure loss variations during volume changes, thereby maintaining optimal electrolyte levels.
Implementation Method 1
When the electrolyte solution passes through the groove, pressure loss occurs. The groove can be regarded as a pipe to allow for estimating the pressure loss.
Implementation Method 2
utilizing the Darcy-Weisbach equation to optimize pressure loss
Implementation Method 3
The second region may function as a weir or a check valve.
Data Source
AI summary
An electrode for a secondary battery includes a substrate and an active material layer. The active material layer is placed on a surface of the substrate. In a surface of the active material layer, one or more grooves are formed. The groove extends linearly in a direction perpendicular to a thickness direction of the active material layer. The groove has an open portion on a periphery of the active material layer. The open portion opens in the direction perpendicular to the thickness direction. The groove includes a first region and a second region. The second region is interposed between the open portion and the first region. In a cross section perpendicular to a direction in which the groove extends, the first region has a first cross-sectional area, and the second region has a second cross-sectional area. The second cross-sectional area is smaller than the first cross-sectional area.