Solid Electrolyte Protrusions for ASSB Tab Short-Circuit Prevention
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Solution Overview
Problem
Conventional methods for assembling all solid-state batteries (ASSB) face challenges in balancing compression levels to prevent internal short circuits while maintaining low resistance, as high compression increases the risk of electrode contact and low compression compromises performance.
Innovation Solution
A cell assembly design featuring a solid electrolyte layer with protrusions positioned to separate electrode tabs, allowing for higher compression without short circuits, thereby reducing internal resistance and improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high compression is applied during assembly, then conductance and low resistivity are improved, but the risk of internal short circuits increases
Solution Approach 1:
The solid electrolyte layer is segmented by adding protrusions that divide the contact area between electrodes and electrolyte. These protrusions create distinct zones that prevent continuous contact paths between anode and cathode, thereby reducing short circuit risk while maintaining compression for good conductance.
Solution Approach 2:
The protrusions act as intermediary elements between the electrode tabs and the electrode layers. They provide physical separation and positioning that prevents direct contact between opposing electrodes, mediating the compression force distribution to maintain low resistance without causing short circuits.
2Object-affected harmful factors
If lower compression is applied, then short circuit risk is reduced, but internal resistance increases and cell performance decreases
Solution Approach 1:
The protrusions create local variations in the electrolyte layer structure, with different compression characteristics in different zones. The areas between protrusions maintain higher compression for low resistance, while the protrusion regions provide separation to prevent short circuits, achieving local optimization of both parameters.
3Object-affected harmful factors
If uniaxial compression is used, then short circuit risk is reduced, but performance is unsatisfactory
Solution Approach 1:
The protrusions introduce a vertical dimension to the compression geometry, transforming the compression from simple uniaxial to a multi-dimensional stress distribution. This allows the electrolyte layer to maintain contact with electrodes in multiple zones while the protrusions provide separation in specific locations, achieving both safety and performance.
Data Source
AI summary
A cell assembly has a plurality of first electrodes, a plurality of second electrodes and a plurality of solid electrolyte layers. The solid electrolyte layers have a protrusion in at least one of the solid electrolyte layers. The protrusion is aligned with a first electrode tab of one of the first electrodes. The folding of the first electrode tabs causes the protrusions to be positioned to separate the first electrode tabs from the second electrodes, thus preventing short circuit between the first electrode tabs and second electrodes. In one aspect, the disclosure provides an all solid-state battery comprising one or more anodes, one or more cathodes and one or more solid electrolyte layers with a protrusion. Also disclosed is a method for preparing same.