Layered All-Solid-State Battery Anode for Conductivity and Adhesion
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Solution Overview
Problem
All-solid-state batteries face challenges in securing sufficient ionic and electronic conductivity due to the difficulty of solid electrolytes penetrating active material layers and the volume change of anode active materials, leading to decreased conductivity and stability.
Innovation Solution
The anode structure includes a current collector layer, a first anode active material layer with a small-diameter solid electrolyte and dot-shaped conductive material, and a second anode active material layer with a larger-diameter solid electrolyte and linear conductive material, optimizing conductivity and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If anode active material with great volume change rate is used to increase energy density, then energy density is improved, but contact between solid electrolyte and conductive material is lost
Solution Approach 1:
The patent applies parameter changes by varying the average particle size of solid electrolytes across different layers. The first solid electrolyte has a smaller average particle size (0.5-2.0 μm) to maintain contact during volume changes in the first layer, while the second solid electrolyte has a larger average particle size (2.5-4.5 μm) in the second layer. This parameter differentiation allows the system to accommodate volume changes of high-capacity anode materials while maintaining electrolyte-conductive material contact.
2Reliability
If solid electrolyte penetrates into pores of active material layer, then ionic conductivity is improved, but penetration difficulty remains
Solution Approach 1:
The patent applies local quality by using smaller average particle size solid electrolyte (first solid electrolyte) in the first anode active material layer where ionic conductivity is most critical near the current collector. The smaller particles can more easily penetrate into the pores of the active material layer in this region, ensuring sufficient ionic conductivity without requiring difficult penetration processes.
Data Source
AI summary
An anode for an all-solid-state battery includes a structure with a current collector layer, a first anode active material layer, and a second anode active material layer stacked in order. The first anode active material layer contains a first solid electrolyte, a first anode active material, a first binder, and a dot-shaped first conductive material. The second anode active material layer contains a second solid electrolyte, a second anode active material, a second binder, and a linear second conductive material. An average particle size of the first solid electrolyte is smaller than an average particle size of the second solid electrolyte.