Solid-State Battery Bilayer Anode for Better Cycle Retention
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Solution Overview
Problem
There is room for improvement in the cycling properties of solid-state batteries containing materials capable of forming alloys with metallic lithium.
Innovation Solution
A solid-state battery design with a laminated structure comprising a gallium-based layer on the side of the solid electrolyte layer and a magnesium-based layer on the side of the negative electrode collector layer, forming a bilayer negative electrode active material layer, which includes gallium or lithium-gallium alloy and magnesium or lithium-magnesium alloy, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If materials capable of forming alloys with metallic lithium are used as negative electrode active materials, then high output voltage can be obtained, but the cycling properties deteriorate
Solution Approach 1:
The negative electrode active material layer is divided into two distinct layers: a gallium-based layer (containing gallium or lithium-gallium alloy) and a magnesium-based layer (containing magnesium or lithium-magnesium alloy). This segmentation allows each layer to perform its specific function - the gallium-based layer provides high voltage output while the magnesium-based layer ensures stable cycling properties, thereby resolving the contradiction between high output voltage and good cycling properties
Solution Approach 2:
The invention uses a composite structure combining gallium-based materials and magnesium-based materials in a bilayer configuration. This composite approach leverages the complementary properties of both materials - gallium's high voltage characteristics and magnesium's excellent cycle stability - to achieve both high output voltage and superior cycling properties simultaneously
Data Source
AI summary
The present disclosure provides a solid-state battery with high cycle characteristics. In the solid-state battery of the present disclosure, a positive electrode current collector layer, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode current collector layer are laminated in this order. The negative electrode active material layer of the solid-state battery of the present disclosure comprises a gallium-based layer containing gallium or lithium-gallium alloy, and a magnesium-based layer containing magnesium or lithium-magnesium alloy. The gallium-based layer is arranged on the side of the solid electrolyte layer, and the magnesium-based layer is arranged on the side of the negative electrolyte layer.