Battery Compression Fixture for Stable Solid Electrolyte Contact
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Solution Overview
Problem
The interfacial behavior of solid electrolyte-lithium metal electrode systems in All-Solid-State Batteries (ASSBs) leads to issues such as lithium metal peeling and uneven stripping, resulting in increased area-specific resistance and reduced electrochemical performance.
Innovation Solution
A device comprising external and internal plates with compliant layers and separator films is used to apply compressive force evenly across the surface of ASSBs, ensuring optimal interfacial contact between the solid electrolyte and high energy dense electrodes like lithium metal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If solid electrolyte is used with lithium metal electrode, then energy density is improved, but interfacial contact stability deteriorates
Solution Approach 1:
The patent applies compressive force to the all-solid-state battery, changing the mechanical pressure parameter at the solid electrolyte-lithium metal interface. This parameter change prevents lithium metal peeling and maintains stable interfacial contact, resolving the reliability issue while preserving the high energy density benefit of using lithium metal electrodes with solid electrolytes
2Reliability
If compressive force is applied to maintain interfacial contact, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the battery structure into modular components including a housing with recesses, compressive elements, and assembly features. This segmentation allows the compressive force application mechanism to be integrated into the battery structure itself rather than requiring external complex equipment, thus improving reliability while controlling device complexity
Solution Approach 2:
The battery structure itself provides the compressive force through integrated compressive elements and housing features. The design enables the battery to self-maintain interfacial contact through its own structural components, eliminating the need for external complex pressure application systems
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 device achieves superior pressure distribution, maintaining optimal interfacial contact and enhancing the electrochemical performance of ASSBs by minimizing resistance and ensuring consistent lithium ion flow.
Implementation Method 1
lithium ions convert to lithium metal at the surface of the lithium metal (plating)
Implementation Method 2
lithium metal is converted into lithium ions and is pulled from the lithium metal surface (stripping)
Data Source
AI summary
A device for applying compressive force to electrochemical cells or batteries with superior pressure distribution, which includes first and second external plates; a first internal plate positionable adjacent to the first external plate, and comprising an external dimension corresponding to an external dimension of the first external plate and an internal dimension defining a first aperture corresponding to the exterior dimensions of an electrochemical cell or battery; a second internal plate positionable adjacent to the second external plate, and comprising external dimension corresponding to an external dimension of the second external plate and an internal dimension defining a second aperture corresponding to the exterior dimensions of the electrochemical cell or battery; and a plurality of fasteners configured to extend through the first and second external plates and the first and second internal plates to apply pressure to the electrochemical cell or battery positioned between the first and second internal plates.