Dry-Laminated Solid Electrolyte Cells for Low-Resistance Interfaces
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Solution Overview
Problem
Solid state battery cells face issues with increased resistance and reduced specific capacity due to poor quality solid state interfaces between the positive and negative electrode layers and the solid electrolyte layers, leading to shorting and decreased performance.
Innovation Solution
A method of dry laminating solid electrolyte layers with active material layers to form composite components, applying force and heat to enhance adhesion, and forming a solid electrolyte-based electrochemical cell with specific separator layer densities and peel strengths to improve interface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid state battery cells use solid electrolyte in place of liquid electrolyte, then safety is improved and theoretical energy density increases, but cell resistance increases and specific capacity decreases due to poor quality solid state interfaces
Solution Approach 1:
The patent introduces an intermediate layer between the solid electrolyte and electrode active material layers. This intermediate layer acts as a mediator that improves the quality of the solid state interface, reducing resistance and enhancing specific capacity while maintaining the safety benefits of solid electrolyte. The intermediate layer facilitates better contact and reduces the harmful effects of direct solid-solid contact.
2Ease of manufacture
If stacking method is employed to combine battery layers, then cell assembly is simplified, but cell resistance increases and specific capacity decreases due to poor quality solid state interfaces
Solution Approach 1:
The stacking method is retained for simplified assembly, but an intermediate layer is introduced at the interfaces between stacked layers. This intermediate layer compensates for the poor quality of solid state interfaces created by stacking, reducing resistance and improving specific capacity while maintaining the manufacturing simplicity of the stacking approach.
3Stability of the object's composition
If solid state interface between positive electrode layer and solid electrolyte layer is formed, then battery structure is established, but cell resistance increases and specific capacity decreases due to poor interface quality
Solution Approach 1:
The intermediate layer is positioned at the solid state interface between the positive electrode layer and solid electrolyte layer, maintaining structural stability while improving interface quality. The intermediate layer reduces resistance and enhances specific capacity by facilitating better contact and reducing the negative effects of direct solid-solid contact.
4Stability of the object's composition
If solid state interface between negative electrode layer and solid electrolyte layer is formed, then battery structure is established, but cell resistance increases and specific capacity decreases due to poor interface quality
Solution Approach 1:
The intermediate layer is positioned at the solid state interface between the negative electrode layer and solid electrolyte layer, maintaining structural stability while improving interface quality. The intermediate layer reduces resistance and enhances specific capacity by facilitating better contact and reducing the negative effects of direct solid-solid contact.
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
The method results in improved cycle life, specific cell capacity, and lower cell resistance by enhancing the solid state interfaces, enabling superior dendrite prevention and faster charge capabilities.
Implementation Method 1
dry laminating the solid electrolyte material to the at least one of the anode active material and the cathode active material to form a composite component
Implementation Method 2
dry laminating includes applying a force per unit area in the range of 2,000-100,000 PSI to the solid electrolyte material to promote adhesion to the anode active material and/or cathode active material
Data Source
AI summary
A method for producing a solid electrolyte-based electrochemical cell by dry laminating the solid electrolyte layers to active material layers to form composite components, contacting composite components, and packaging the contacted composite components to form a solid electrolyte-based electrochemical cell.