Composite Solid Electrolyte Layers to Suppress Battery Cracking
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Solution Overview
Problem
Batteries with existing solid electrolyte configurations often suffer from cracks in the electrolyte layers during production, which degrade their cycle characteristics.
Innovation Solution
A battery design featuring a first electrolyte layer with a mass ratio of the second solid electrolyte material to the first solid electrolyte material greater than 0.05 and less than 1, and a second electrolyte layer containing only the second solid electrolyte material, both of which have distinct compositions and improve ion conductivity and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single solid electrolyte material is used in the electrolyte layer, then the device complexity is reduced, but cracks occur in the electrolyte layer during production which degrades cycle characteristics
Solution Approach 1:
The electrolyte layer is constructed as a composite material system containing two different solid electrolyte materials with distinct compositions and properties. This composite structure prevents crack formation during production while maintaining overall structural integrity, thereby improving cycle characteristics without excessive complexity increase.
Solution Approach 2:
Different regions of the electrolyte layer are assigned different solid electrolyte materials based on their specific functional requirements. The first solid electrolyte material addresses crack suppression needs, while the second material contributes to other performance aspects, allowing each material to optimize its local function within the composite structure.
2Reliability
If the mass ratio of the second solid electrolyte material to the first solid electrolyte material is increased, then crack suppression is improved, but the ion conductivity may be compromised
Solution Approach 1:
The mass ratio of the two solid electrolyte materials is precisely controlled within the range of 0.05 to 1. This parameter optimization ensures sufficient crack suppression capability while maintaining adequate ion conductivity. The specific ratio range balances the competing requirements of structural integrity and ionic transport efficiency.
Data Source
AI summary
The battery includes a positive electrode, a first electrolyte layer, a second electrolyte layer, and a negative electrode arranged in this order. The first electrolyte layer contains a first solid electrolyte material and a second solid electrolyte material. In the first electrolyte layer, the mass ratio of the second solid electrolyte material to the first solid electrolyte material is greater than 0.05 and less than 1. The second electrolyte layer contains the second solid electrolyte material. The first solid electrolyte material is formed of Li, M, O, and X. In the first solid electrolyte material, M is at least one element selected from the group consisting of metal elements other than Li, and metalloids, and X is at least one element selected from the group consisting of Cl, Br, and I. The second solid electrolyte material has a composition different from that of the first solid electrolyte material.