Solid-State Battery Voids Under Negative Pressure for Stable Conductivity
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Solution Overview
Problem
Conventional battery technologies face challenges in achieving high battery characteristics and reliability, particularly with inorganic solid electrolytes, which require external restraining forces to enhance ionic conductivity but compromise capacity density and long-term reliability.
Innovation Solution
A battery design featuring a power generation element with voids under reduced pressure, where the internal pressure is lower than atmospheric pressure, and a manufacturing method involving compression in a reduced-pressure atmosphere to maintain negative pressure within the voids, thereby suppressing damage and enhancing conductivity without external restraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external restraining force is applied to increase ionic conductivity of inorganic solid electrolyte, then ionic conductivity is improved, but capacity density per volume and per weight decreases
Solution Approach 1:
The invention changes the pressure parameter from external mechanical restraint to internal negative pressure environment. By creating voids with internal pressure lower than 1 atm, the solid electrolyte maintains high ionic conductivity without external restraints, thus preserving capacity density while achieving reliable ionic conduction.
2Reliability
If external restraining force is applied to maintain interface contact, then reliability is improved, but device complexity increases
Solution Approach 1:
The invention employs a self-service mechanism where the negative pressure environment automatically maintains interface contact between solid electrolyte and electrodes. The pressure differential causes the solid electrolyte to be pressed against the electrodes, ensuring stable interface contact without requiring external restraint mechanisms.
3Reliability
If voids are present in the power generation element, then internal pressure is reduced, but manufacturing precision becomes more difficult
Solution Approach 1:
The invention intentionally creates a porous structure with controlled voids in the power generation element. These voids establish the negative pressure environment necessary for maintaining ionic conductivity. The porous structure is designed to provide sufficient void space while maintaining overall structural integrity and electrical performance.
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 both high battery characteristics and reliability by reducing internal pressure within the battery, preventing damage from void expansion and maintaining ion and electron conductivity, while avoiding the need for external restraints that would decrease capacity.
Implementation Method 1
pressing a body to be compressed including at least one of the positive electrode layer, the negative electrode layer, or the solid electrolyte layer in a reduced-pressure atmosphere
Data Source
AI summary
The battery includes a power generation element including: a positive electrode active material layer containing a positive electrode active material and a first inorganic solid electrolyte; a negative electrode active material layer containing a negative electrode active material and a second inorganic solid electrolyte; and a solid electrolyte layer positioned between the positive electrode active material layer and the negative electrode active material layer and containing a third inorganic solid electrolyte. There are a plurality of voids inside the power generation element, and an internal pressure of the plurality of voids is lower than 1 atm.