All-Solid-State Battery Electrode Infiltration for Low-Pressure Bonding
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Solution Overview
Problem
Current methods for producing all-solid-state batteries face challenges such as high pressure requirements, limited productivity, and instability of sulfide and complex hydride solid electrolytes, particularly in forming interfaces and handling organic solvents, which restrict the scalability and safety of these batteries.
Innovation Solution
A method involving impregnation of electrode layers with a solid electrolyte solution containing boron hydride compounds, followed by solvent removal to precipitate the solid electrolyte, allowing for bonding of electrode layers at low pressure, thereby eliminating the need for high-pressure forming and enabling mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pressing pressure is used to form interfaces between solid electrolyte and electrodes, then interface bonding quality is improved, but production complexity and difficulty increase
Solution Approach 1:
The invention changes the physical state of the electrolyte from solid to liquid, allowing interface formation at atmospheric pressure through liquid infiltration, eliminating the need for high-pressure pressing equipment and complex production processes while maintaining reliable interface bonding
Solution Approach 2:
The invention uses liquid electrolyte as an intermediary substance that infiltrates the interface between solid electrodes and solid electrolyte layer, forming a reliable bond without requiring high-pressure mechanical contact
2Reliability
If sulfide solid electrolyte is dissolved with alcohol solvent for coating, then interface bonding is improved, but hydrogen sulfide generation occurs causing safety issues
Solution Approach 1:
The invention replaces the harmful alcohol solvent with water as the dissolution medium, converting a potentially harmful chemical process into a safe one while maintaining the ability to form good interface bonding through liquid electrolyte infiltration
Solution Approach 2:
The invention uses water, a safe and inexpensive solvent, instead of alcohol, eliminating the need for special handling facilities and reducing safety risks associated with flammable and toxic substances
3Manufacturing precision
If positive electrode layer and negative electrode layer are formed with high pressing pressure, then electrode density is improved, but productivity decreases
Solution Approach 1:
The invention changes the electrolyte state to liquid, allowing electrode assembly at atmospheric pressure, which eliminates time-consuming high-pressure pressing steps and significantly increases production speed while maintaining adequate electrode density through liquid infiltration
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 approach results in high productivity and scalable production of all-solid-state batteries with improved safety and energy density, as it avoids the use of flammable organic solvents and reduces the risk of hydrogen sulfide generation, facilitating their application in large energy storage devices and vehicles.
Implementation Method 1
a step of removing the solvent from the solid electrolyte solution and causing the solid electrolyte to precipitate on at least one of the positive electrode layer and the negative electrode layer
Data Source
Figure 1~2
Figure 3
AI summary
The present invention makes it possible to provide a production method for an all-solid-state battery having a solid electrolyte layer between a positive electrode layer and a negative electrode layer, the production method being characterized by including: a step for coating or impregnating the positive electrode layer and/or the negative electrode layer with a solid electrolyte solution in which a boron hydride compound serving as the solid electrolyte has been dissolved in a solvent; and a step for removing the solvent from the coated or impregnated solid electrolyte solution and causing the solid electrolyte to precipitate on the positive electrode layer and/or the negative electrode layer.