All-Solid Battery Cell Structure for Low-Pressure Interface Contact
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional all-solid batteries require high pressure to maintain low solid-solid interface resistance, necessitating heavy or bulky pressure restraining jigs, which is impractical and limits battery size and energy density.
Innovation Solution
An all-solid battery design featuring a unit cell with an ion-conductive inorganic solid electrolyte layer, formed by a dry process, where the electrode group is pressurized to deform the solid electrolyte, reducing interface resistance without the need for a restraining jig, allowing for low-pressure operation with minimal volume increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pressure (several MPa to several tens of MPa) is applied to maintain low solid-solid interface resistance, then interface resistance is reduced, but the battery requires heavy or bulky pressure restraining jigs
Solution Approach 1:
The invention changes the pressure parameter from conventional high pressure (several MPa to several tens of MPa) to low pressure (100 kPa or less), achieving low interface resistance without requiring heavy pressure restraining jigs. This is accomplished through specific solid electrolyte material selection and electrode structure design that enable effective contact at reduced pressure levels.
2Reliability
If high pressure (several MPa to several tens of MPa) is applied to maintain low solid-solid interface resistance, then interface resistance is reduced, but the battery structure becomes bulky
Solution Approach 1:
The invention reduces the pressure parameter from conventional high pressure to low pressure (100 kPa or less), eliminating the need for bulky pressure restraining structures. The low-pressure design enables compact battery configuration while maintaining low interface resistance through optimized solid electrolyte and electrode interfaces.
3Device complexity
If the electrode group is not restrained or restrained at low pressure, then the battery structure is simplified, but the resistance at solid-solid interface increases, making it impossible to cause battery reaction
Solution Approach 1:
The invention achieves low interface resistance at low pressure (100 kPa or less) through specific solid electrolyte material selection and electrode structure optimization, eliminating the need for complex pressure restraining structures while maintaining effective battery reaction.
Solution Approach 2:
The invention uses composite solid electrolyte materials and optimized electrode compositions that facilitate low-resistance interfaces at reduced pressure. The specific material combinations enable effective ionic conduction and electrical contact without requiring high-pressure confinement.
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 battery achieves low solid-solid interface resistance and high energy density by ensuring close contact between solid electrolyte particles, enabling efficient battery reactions at reduced pressures, thus eliminating the need for bulky restraining jigs and allowing for larger, more efficient battery designs.
Implementation Method 1
pressurizing the electrode group to plastically deform the inorganic solid electrolyte
Data Source
AI summary
An all-solid battery includes at least a unit cell including a positive electrode, a negative electrode, and an ion-conductive solid electrolyte layer interposed between the positive electrode and the negative electrode. The solid electrolyte layer includes an inorganic solid electrolyte, and a resistance R1 of the unit cell when the pressure applied in a thickness direction of the unit cell is 100 kPa is 90 Ωcm2 or less.