Solid Electrolyte Lamination for Stronger All-Solid-State Battery Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for manufacturing all-solid state secondary batteries fail to achieve sufficient interlaminar adhesion between the negative electrode active material layer, solid electrolyte layer, and positive electrode active material layer, limiting battery performance and productivity.
Innovation Solution
A method involving pre-compression bonding and peeling steps, where a solid electrolyte layer with a polymer and inorganic binder is formed on a support, allowing 1-10% of the layer to remain on the support, enabling strong interlaminar adhesion by transferring it back to the active material layer, and subsequent post-compression bonding to enhance layer integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple compression bonding steps are performed to laminate the negative electrode active material layer, solid electrolyte layer, and positive electrode active material layer, then the layers can be assembled, but sufficient interlaminar adhesion cannot be achieved
Solution Approach 1:
The solid electrolyte layer is pre-formed on a support with a specific surface structure before lamination. The support provides preliminary structural guidance and the surface structure is prepared in advance to enable strong adhesion during the subsequent lamination step, eliminating the need for multiple compression bonding steps.
Solution Approach 2:
A support with a specific surface structure serves as an intermediary between the solid electrolyte layer and the electrode active material layers. The support's surface structure facilitates strong interlaminar adhesion during lamination, and the support itself acts as a mediator that enables the bonding process to be completed in a single step rather than multiple steps.
2Strength
If the solid electrolyte layer surface is kept flat for compression bonding, then the layers can be laminated, but strong interlaminar adhesion is not exhibited
Solution Approach 1:
The support surface is designed with local quality variations - a specific surface structure in the region that contacts the electrode active material layers. This localized structural feature provides the necessary adhesion properties without compromising the overall lamination process, allowing strong interlaminar adhesion while maintaining manufacturability.
3Reliability
If further compression bonding is performed to prevent void formation at interfaces, then voids can be reduced, but the solid electrolyte layers still cannot strongly adhere to each other
Solution Approach 1:
The support surface structure is prepared in advance to prevent void formation and enable strong adhesion simultaneously. The preliminary surface structure design eliminates the need for excessive compression bonding while ensuring both void prevention and strong interlaminar adhesion in a single lamination step.
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 strengthens interlaminar adhesion, resulting in improved battery performance with lower resistance and higher productivity, effectively addressing the limitations of previous manufacturing techniques.
Implementation Method 1
it is important to laminate the layers with not only high adhesion between solid particles in the respective layers but also high interlaminar adhesion between adjacent layers
Implementation Method 2
a manufacturing technique of compressing and bonding (pressing) a constituent layer can be used
Data Source
AI summary
Provided is a method of manufacturing an all-solid state secondary battery having a layer configuration in which a positive electrode active material layer, a solid electrolyte layer, and a negative electrode active material layer are laminated in this order, the method comprising: a pre-compression bonding step of laminating a solid electrolyte layer and one of a positive electrode active material layer or a negative electrode active material layer to form a laminate and compressing the laminate to bond the layers, the solid electrolyte layer being formed on a support and including a binder consisting of a polymer and an inorganic solid electrolyte; a step of peeling off the support from the solid electrolyte layer such that 1% to 10 mass % of the solid electrolyte layer that is compressed and bonded to the active material layer remains in the support; and a post-compression bonding step of laminating the solid electrolyte layer from which the support is peeled off and another one of the positive electrode active material layer or the negative electrode active material layer to form a laminate and compressing the laminate to bond the layers. Provided also are an electrode sheet for an all-solid state secondary battery that is manufactured in the manufacturing method, and a method of manufacturing the electrode sheet for an all-solid state secondary battery.