All-Solid-State Battery Electrode Structure for Higher Capacity Density
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in achieving improved capacity within a given volume for their positive and negative electrode active materials, which is crucial for enhancing the performance and efficiency of these batteries.
Innovation Solution
The design incorporates electrode layers with current collectors and electrode active material layers that include extension portions extending in the stacking direction, with solid electrolyte layers bent to interpose between these extensions, allowing for increased contact area and improved ion transfer, thereby enhancing the capacity of the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode active material layer is extended in the stacking direction to increase capacity, then the energy density is improved, but the contact area with the solid electrolyte layer becomes insufficient
Solution Approach 1:
The electrode active material layer is extended in the stacking direction (vertical dimension) to create an extension portion that protrudes between adjacent electrode layers. This dimensional extension allows the electrode material to access ion transfer pathways in the vertical direction while maintaining planar contact area with the solid electrolyte layer, thereby resolving the contradiction between increased capacity and sufficient contact area.
2Productivity
If the solid electrolyte layer is bent to follow the extension portion, then the ion transfer path is optimized, but the manufacturing complexity increases
Solution Approach 1:
The solid electrolyte layer is designed with a bent configuration that follows the contour of the extended electrode active material layer. This curvature allows the solid electrolyte to maintain intimate contact with the electrode extension portion, optimizing the ion transfer path along the curved interface while accommodating the three-dimensional structure through controlled bending rather than rigid complex geometry.
3Volume of stationary object
If multiple electrode layers are stacked to increase energy density, then the volume efficiency is improved, but the risk of short circuit between layers increases
Solution Approach 1:
The solid electrolyte layer serves as an intermediary barrier between adjacent electrode layers with different polarities. By positioning the solid electrolyte layer between these layers and conforming it to the extended electrode structures, the design maintains electrical isolation while enabling efficient ion transfer, thus preventing short circuits while achieving high volumetric energy density through multi-layer stacking.
Data Source
AI summary
An all-solid-state battery includes an electrode layer including a current collector extending in a plane direction and an electrode active material layer disposed on at least one surface of the current collector, and a solid electrolyte layer disposed adjacent to the electrode layer in a stacking direction perpendicular to the plane direction, in which the electrode active material layer includes an extension portion extending in the stacking direction and having a portion disposed adjacent to a neighboring electrode active material layer in the plane direction.