Solid Electrolyte Coating for Uniform All-Solid-State Battery Layers
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Solution Overview
Problem
Existing methods for producing all-solid-state batteries face challenges with unevenness of the solid electrolyte layer and require high pressing pressures, limiting productivity and scalability.
Innovation Solution
A method involving dispersing insoluble fine particles in a solid electrolyte solution, followed by solvent removal to deposit the electrolyte, which suppresses unevenness and allows for high productivity without high pressing pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a solid electrolyte solution is applied to the electrode layer and dried to form a solid electrolyte layer, then productivity is improved and high pressing pressure is not required, but the coated surface becomes uneven causing pinholes and internal short circuits
Solution Approach 1:
The patent introduces a surfactant as an intermediary substance in the solid electrolyte solution. The surfactant acts as a mediator between the solid electrolyte and the electrode layer surface, reducing surface tension and preventing uneven coating. This allows the solution to spread uniformly across the electrode layer without forming pinholes or aggregates, thereby maintaining surface uniformity while enabling the simplified drying process that improves productivity
Solution Approach 2:
The patent modifies the composition parameters of the solid electrolyte solution by adding a surfactant component. This changes the surface tension and wetting properties of the solution, enabling it to form a uniform coating on the electrode layer. The parameter change in solution composition directly addresses the surface uniformity issue while preserving the high-productivity drying method
2Reliability
If pressing techniques requiring high pressure are used to prepare all-solid-state batteries, then interface bonding is achieved, but the production of large electrodes is limited and manufacturing becomes difficult
Solution Approach 1:
The patent replaces the high-pressure mechanical pressing system with a chemical/physical coating system. Instead of using high pressure to achieve interface bonding, the invention uses a surfactant-containing solid electrolyte solution that spontaneously forms a uniform coating on the electrode layer through capillary action and surface tension reduction. The subsequent drying process creates strong adhesion without requiring high-pressure equipment, thereby improving manufacturing ease while maintaining reliable interface bonding
Solution Approach 2:
The surfactant serves as a chemical intermediary that facilitates interface bonding without mechanical pressure. It modifies the interfacial properties between the solid electrolyte and electrode layer, enabling strong adhesion through enhanced wetting and reduced interfacial tension. This chemical mediation approach replaces the need for high-pressure mechanical bonding, making the process easier to manufacture at scale
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 a uniform solid electrolyte layer with improved productivity and suitability for mass production, addressing the issues of unevenness and high pressure requirements in conventional techniques.
Implementation Method 1
applying the solid electrolyte solution to the electrode layer filled with the solid electrolyte and drying it to form a solid electrolyte layer
Implementation Method 2
removing a solvent to cause the solid electrolyte to deposit
Implementation Method 3
dispersing insoluble fine particles in a solid electrolyte solution
Data Source
AI summary
The present invention is able to provide a method for producing an all-solid-state battery that has a solid electrolyte layer between a positive electrode layer and a negative electrode layer. This method for producing an all-solid-state battery is characterized by comprising: a step wherein a coating liquid is applied to at least one of the positive electrode layer and the negative electrode layer, said coating liquid containing a solid electrolyte solution, which is obtained by dissolving a solid electrolyte in a solvent, and fine particles which are insoluble in the solid electrolyte solution; and a step wherein the solvent is removed from the applied coating liquid, thereby having the solid electrolyte deposit on at least one of the positive electrode layer and the negative electrode layer.