All-Solid-State Battery Electrode with Dual-Size Solid Electrolytes
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Solution Overview
Problem
Current all-solid-state batteries face challenges in reducing battery resistance, which is not adequately addressed by existing technologies, particularly due to insufficient contact between the solid electrolyte and the active material.
Innovation Solution
The use of an electrode comprising an active material with a mean particle diameter between 0.01 μm and 0.7 μm, combined with two-type solid electrolytes of different mean particle diameters (0.01-0.7 μm and 0.7-2.0 μm) to increase the contact area and reduce battery resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-type solid electrolyte is used in the electrode, then the electrode structure is simple, but the battery resistance is high due to insufficient contact area with active material
Solution Approach 1:
The solid electrolyte is segmented into two distinct particle size ranges: fine particles (0.01-0.7 μm) that fill gaps and increase contact area, and coarse particles (0.7-2.0 μm) that provide structural framework. This segmentation resolves the contradiction by creating a multi-scale structure that simultaneously reduces resistance and maintains structural integrity.
Solution Approach 2:
Different regions of the electrode receive different solid electrolyte particle sizes optimized for their specific functions: fine particles concentrate at active material interfaces to maximize contact area and reduce resistance, while coarse particles form the bulk matrix for structural support. This local optimization resolves the contradiction between simplicity and performance.
2Reliability
If the mean particle diameter of solid electrolyte is reduced to increase contact area, then battery resistance decreases, but the packing efficiency and mechanical strength deteriorate
Solution Approach 1:
The solid electrolyte population is segmented into two size classes that work synergistically: fine particles (0.01-0.7 μm) provide extensive surface area for ionic contact with active material, reducing resistance, while coarse particles (0.7-2.0 μm) form a mechanically robust framework that maintains electrode strength and packing efficiency.
Solution Approach 2:
The electrode uses a composite structure combining fine and coarse solid electrolyte particles, analogous to composite materials science where different scale components work together. The fine-coarse particle composite resolves the contradiction by allowing each size class to optimize for its strength function while collectively achieving both low resistance and high mechanical integrity.
Data Source
AI summary
An electrode for an all-solid-state battery includes an active material, a first solid electrolyte, and a second solid electrolyte. A mean particle diameter of the active material is greater than or equal to 0.01 μm and less than or equal to 0.7 μm. A mean particle diameter of the first solid electrolyte is greater than or equal to 0.01 μm and less than or equal to 0.7 μm. A mean particle diameter of the second solid electrolyte is greater than or equal to 0.7 μm and less than or equal to 2.0 μm.