Solid-State Battery Electrolyte Layer Structure for Higher Energy Density
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Solution Overview
Problem
Existing solid-state batteries face issues with increased total thickness of the solid electrolyte layer, decreased energy density, and increased battery resistance due to multiple solid electrolyte layers, necessitating a proper design of the electrolyte layers to address these challenges.
Innovation Solution
A solid-state battery structure with a laminated configuration of first, second, and third solid electrolyte layers, each with specific thicknesses and binder content, optimized for adhesion and stretchability, to improve energy density and reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple solid electrolyte layers are used to improve adhesion and suppress voltage decrease, then reliability is improved, but the total thickness of the solid electrolyte layer increases and energy density decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of each solid electrolyte layer (first layer: 3-8.5 μm, second layer: 10-20 μm, third layer: 3-8.5 μm) and the binder content in each layer. This optimization allows the total thickness to be reduced to 17-26 μm while maintaining the protective function against voltage decrease, resolving the contradiction between reliability and thickness.
2Reliability
If multiple solid electrolyte layers are used to improve adhesion and suppress voltage decrease, then reliability is improved, but battery resistance increases
Solution Approach 1:
The patent reduces battery resistance by optimizing the binder content parameter in each solid electrolyte layer. The first layer contains 5-25 vol% binder, the second layer contains 5-25 vol% binder, and the third layer contains 2.7-10 vol% binder. This parameter optimization ensures sufficient adhesion while minimizing resistance, resolving the contradiction between reliability and resistance.
3Reliability
If the solid electrolyte layer is formed of multiple layers to improve adhesion, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by assigning different functions and properties to different regions of the solid electrolyte layer. The first layer (adjacent to positive electrode) focuses on adhesion with binder content of 5-25 vol%, the second layer (intermediate) provides structural support with binder content of 5-25 vol%, and the third layer (adjacent to negative electrode) minimizes resistance with binder content of 2.7-10 vol%. This localized optimization improves reliability while managing complexity through functional differentiation.
Data Source
AI summary
Provided is a solid-state battery including a solid electrolyte layer properly designed according to a function and having an improved energy density. The solid-state battery has a structure in which a negative electrode layer, a solid electrolyte layer, and a positive electrode layer are laminated in this order. The solid electrolyte layer includes a first solid electrolyte layer, a second solid electrolyte layer, and a third solid electrolyte layer disposed in this order from the positive electrode layer side. The thickness of the first solid electrolyte layer is 3 to 8.5 μm. The thickness of the second solid electrolyte layer is 10 to 20 μm. The thickness of the third solid electrolyte layer is 3 to 8.5 μm. The total thickness of the solid electrolyte layer is 17 to 26 μm.