All-solid-state Battery Heated Region Adhesion
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Solution Overview
Problem
Current all-solid-state batteries using organic or oxide-based solid electrolytes face challenges in achieving high adhesion strength and favorable charging-and-discharging characteristics due to the use of binders, which deteriorate battery performance, and the sintering process can lead to diffusion of electrode elements, making it difficult to obtain high capacity and size scalability.
Innovation Solution
The battery design incorporates a heated region at the end portions of the electrode layers where the influence of heat is received, causing particles to melt and re-solidify, improving adhesion strength and reducing porosity, while a manufacturing method involving laser cutting forms these heated regions to enhance the anchor effect and prevent peeling-off, thereby securing long-term reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If binders are used to improve adhesion strength between electrode layers, then adhesion strength is improved, but battery performance deteriorates
Solution Approach 1:
The invention removes binders from the electrode structure entirely, extracting the harmful element that caused performance deterioration while maintaining adhesion through alternative mechanisms (surface treatment, mechanical interlocking, or intrinsic material properties), thus resolving the contradiction between adhesion strength and battery performance
Solution Approach 2:
The electrode materials themselves provide the adhesion function without requiring separate binder materials. The structural components serve dual purposes: maintaining electrical functionality and providing mechanical bonding between layers, eliminating the need for dedicated binders that compromised performance
2Object-affected harmful factors
If sintering process is used to decrease particle boundary resistance in oxide-based solid electrolyte, then particle boundary resistance is decreased, but electrode elements diffuse making it difficult to obtain favorable charging-and-discharging characteristics
Solution Approach 1:
The invention changes the processing parameters from high-temperature sintering to low-temperature or room-temperature processing methods, such as compression molding, cold sintering, or field-assisted sintering. This allows particle boundary resistance to be decreased through densification without reaching temperatures that cause element diffusion, thus maintaining favorable charging-and-discharging characteristics
Solution Approach 2:
The invention utilizes phase transition mechanisms such as pressure-induced densification or field-induced ordering to reduce particle boundary resistance without thermal sintering. By applying pressure or external fields during assembly, the solid electrolyte achieves low particle boundary resistance while avoiding the thermal diffusion that would compromise electrode integrity
3Object-affected harmful factors
If thin-film structure is used to reduce particle boundary resistance in oxide-based solid electrolyte, then particle boundary resistance is reduced, but battery size cannot be increased
Solution Approach 1:
The invention changes from thin-film geometry to thick-film or bulk geometry by using compression molding or cold sintering processes that enable densification of thicker solid electrolyte layers. This allows the battery to be scaled up in size while maintaining low particle boundary resistance through improved particle contact and reduced void spaces in the bulk structure
4Reliability
If compression molding is used for sulfide-based solid electrolyte to avoid sintering, then favorable characteristics are obtained, but adhesion strength between layers is insufficient
Solution Approach 1:
The invention merges compression molding with subsequent adhesion-enhancement processes such as hot pressing, ultrasonic treatment, or surface activation. This combination maintains the favorable charging-and-discharging characteristics achieved through compression molding while adding the necessary adhesion strength through the secondary treatment that creates stronger interfacial bonding between layers
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 achieves high adhesion strength and improved battery characteristics, allowing for increased capacity and size scalability without the need for binders, leading to enhanced reliability and performance.
Implementation Method 1
In the heated region, an influence of heat is received or particles included in the at least one member is melted and then re-solidified
Implementation Method 2
particles included in the at least one member is melted and then re-solidified
Implementation Method 3
a manufacturing method involving laser cutting forms these heated regions
Data Source
AI summary
An all-solid-state battery includes a positive-electrode current collector, a positive electrode layer, a negative-electrode current collector, a negative electrode layer, and a solid electrolyte layer. The positive electrode layer is formed on the positive-electrode current collector and includes at least a positive-electrode active material. The negative electrode layer is formed on the negative-electrode current collector and includes at least a negative-electrode active material. The solid electrolyte layer is disposed between the positive electrode layer and the negative electrode layer and includes at least a solid electrolyte having ion conductivity. At least one member selected from the group consisting of the positive-electrode current collector, the positive electrode layer, the negative-electrode current collector, the negative electrode layer, and the solid electrolyte layer includes a heated region at an end portion of the at least one member.