Solid-State Battery Void Pressure Structure Against Delamination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional batteries with solid electrolytes face challenges in achieving high capacity, excellent charge-discharge cycle characteristics, and reliability due to limitations in ion and electron conductivity, as well as the inconvenience of applying external restraining forces for capacity density and weight.
Innovation Solution
A battery design featuring a power generation element with an electrode layer, counter electrode layer, and solid electrolyte layer, where a void with internal pressure lower than 1 atm is created between the sealing material, electrode current collector, and the first surface, reducing delamination forces and enhancing mechanical strength through negative pressure and recessed electrode current collectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external restraining force mechanism is applied to maintain solid electrolyte conductivity, then ion and electron conductivity is improved, but capacity density per volume and weight deteriorates
Solution Approach 1:
The battery structure itself generates the restraining force through the negative pressure void, eliminating the need for external restraining mechanisms. The void's negative pressure automatically applies compressive force to the solid electrolyte, maintaining conductivity without adding external components that would increase weight.
Solution Approach 2:
The invention changes the pressure parameter by creating a negative pressure environment (lower than 1 atm) within the void. This pressure change allows the solid electrolyte to maintain high conductivity through the applied compressive force while keeping the battery structure compact and lightweight.
2Strength
If a void with negative pressure is created between sealing material and electrode current collector, then delamination force is reduced and mechanical strength is improved, but structural complexity increases
Solution Approach 1:
The invention uses a negative pressure void (pneumatic principle) to apply uniform compressive force between the sealing material and electrode current collector. This pneumatic pressure distribution reduces delamination forces and improves mechanical strength without requiring complex mechanical fastening structures.
Solution Approach 2:
The electrode current collector includes a recess that curves toward the void, creating a curved interface that better distributes the negative pressure forces. This curvature improves mechanical strength by reducing stress concentration points while maintaining structural simplicity.
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 design achieves high battery characteristics and reliability by reducing delamination forces and improving mechanical strength, even in high-temperature and reduced-pressure environments, while maintaining battery capacity and preventing breakage.
Implementation Method 1
a void surrounded by the sealing material, the first surface, and the electrode current collector is present, an internal pressure of the void is lower than 1 atm
Data Source
AI summary
The battery includes: a power generation element including a negative electrode active material layer, a positive electrode active material layer, and a solid electrolyte layer positioned between the negative electrode active material layer and the positive electrode active material layer; a sealing material that seals a first surface, which is a side surface of the power generation element; and a negative electrode current collector positioned on a side of the negative electrode active material layer in the power generation element. In the battery, a void surrounded by the sealing material, the first surface, and the negative electrode current collector is present, and the internal pressure of the void is lower than 1 atm. The negative electrode current collector includes a first recess curved to be recessed toward the void.