Solid-State Battery Lamination with Surface Irregularities for Adhesion
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Solution Overview
Problem
Solid-state batteries face challenges in achieving sufficient adhesion between the electrode and solid electrolyte layers during manufacturing, leading to potential delamination, increased interface resistance, and reduced capacity rate characteristics, which hinder the attainment of preferred battery characteristics.
Innovation Solution
A manufacturing method involving a first pressing step for densification, followed by an irregularity forming step using a press machine with projections to create surface irregularities on the solid electrolyte layer, and a second pressing step to integrate the layers, enhancing adhesion and productivity while simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electrode layer and solid electrolyte layer are pre-pressed and then integrally pressed for densification and productivity improvement, then productivity and densification are improved, but adhesion at the interface between layers becomes insufficient and delamination may occur
Solution Approach 1:
The invention forms irregularities on the solid electrolyte layer surface through a first pressing step before the integral pressing step. This preliminary action creates surface features that will enhance adhesion during the subsequent integral pressing, resolving the contradiction between productivity and adhesion by preparing the surface in advance.
Solution Approach 2:
The invention creates localized irregularities (projections and depressions) on specific regions of the solid electrolyte layer surface. This local quality change concentrates adhesion enhancement at the interface contact points without affecting the overall densification process, allowing both productivity and adhesion to be improved simultaneously.
2Strength
If irregularities are formed on the surfaces of the electrode layer and solid electrolyte layer after densification pressing, then adhesion is improved, but the manufacturing process becomes more complex and productivity decreases
Solution Approach 1:
The invention merges the irregularity formation process with the pressing process by using a press machine with a contact portion having projections. This combination allows irregularities to be formed during the pressing operation itself, eliminating the need for separate irregularity formation steps and maintaining high productivity while improving adhesion.
Solution Approach 2:
The press machine is designed with dual functionality: it performs both the densification pressing and the irregularity formation through its contact portion with projections. This multi-functionality allows a single device to achieve both objectives without requiring additional specialized equipment, thus maintaining productivity while improving adhesion.
3Ease of manufacture
If irregularities are not formed on the surfaces of the electrode layer and solid electrolyte layer, then the manufacturing process is simple and productivity is high, but adhesion at the interface is insufficient leading to delamination and increased interface resistance
Solution Approach 1:
The press machine's contact portion with projections automatically forms irregularities on the solid electrolyte layer surface during the normal pressing operation. The system serves itself by using the pressing action to create both densification and surface irregularities simultaneously, eliminating the need for separate processing steps while ensuring reliable adhesion.
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 method ensures improved adhesion and densification, preventing delamination and enhancing battery performance by forming irregularities on the solid electrolyte layer using a press machine with projections, thereby achieving preferred battery characteristics and increased productivity.
Implementation Method 1
a first pressing step of pressing a layer including at least the solid electrolyte layer; an irregularity forming step of forming irregularities on a surface of the solid electrolyte layer
Implementation Method 2
a first pressing step of pressing a layer including at least the solid electrolyte layer; a second pressing step of pressing the solid electrolyte layer and the electrode layer
Data Source
AI summary
Provided is a manufacturing method for a solid-state battery capable of achieving densification, improvement of productivity, and preferred battery characteristics in a compatible manner. Embodiments provide a manufacturing method for a solid-state battery including an electrode layer composed of a positive electrode layer and a negative electrode layer, and a solid electrolyte layer, the method including: a first pressing step of pressing a layer including at least the solid electrolyte layer; a irregularity forming step of forming irregularities on a surface of the solid electrolyte layer; and a second pressing step of pressing the solid electrolyte layer and the electrode layer to thereby produce a laminate.