All-solid state battery electrode layer with sulfide solid electrolyte
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Solution Overview
Problem
All-solid state batteries face challenges in achieving low internal resistance, which affects their performance and efficiency.
Innovation Solution
The electrode layer in the battery incorporates a sulfide solid electrolyte with an average particle diameter of less than 1 µm and an imidazoline-based dispersion material, along with a rubber-based binder, to create a good joining interface and reduce internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sulfide solid electrolyte with average particle diameter less than 1 μm is used, then the internal resistance of the electrode layer is reduced, but the manufacturing precision and handling difficulty increase
Solution Approach 1:
The patent applies parameter changes by optimizing the average particle diameter of the sulfide solid electrolyte to be less than 1 μm (specifically 0.1-0.9 μm), and controlling the content of imidazoline-based dispersion material within specific ranges (0.005-0.5 parts by weight per 100 parts electrode active material). These parameter optimizations reduce internal resistance while maintaining manufacturability through precise control specifications.
2Reliability
If an imidazoline-based dispersion material is added to improve interface joining, then the internal resistance decreases, but the device complexity and material composition increases
Solution Approach 1:
The patent uses an imidazoline-based dispersion material as an intermediary substance between the sulfide solid electrolyte and electrode active material. This dispersion material improves the joining interface and reduces internal resistance by facilitating better contact and interaction between the solid electrolyte particles and electrode materials, without requiring fundamental changes to the battery structure.
3Productivity
If the surface roughness at the interface between electrode mixture layer and solid electrolyte layer is reduced, then the battery performance improves, but the manufacturing complexity increases
Solution Approach 1:
The patent controls the surface roughness Ra at the interface between the positive electrode mixture layer and solid electrolyte layer to be 1.0 μm or less, and optimizes the average particle diameter of sulfide solid electrolyte to less than 1 μm. These parameter controls improve battery performance by ensuring good contact between layers while managing manufacturing complexity through specific quantitative targets.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly reduces the internal resistance of the electrode layer, enhancing the battery's performance and efficiency by forming a better interface between the electrode active material and the sulfide solid electrolyte.
Implementation Method 1
the electrode layer contains an imidazoline-based dispersion material
Implementation Method 2
the distance calculated from Hansen solubility parameters of the sulfide solid electrolyte and the imidazoline-based dispersion material may be smaller than the distance calculated from Hansen solubility parameters of the sulfide solid electrolyte and the binder
Implementation Method 3
the sulfide solid electrolyte has an average particle diameter (D50) of less than 1 μm
Data Source
AI summary
There is provided an electrode layer for an all-solid state battery, which contains an electrode active material and a sulfide solid electrolyte, where the sulfide solid electrolyte has an average particle diameter of less than 1 µm and the electrode layer contains an imidazoline-based dispersion material.