Solid-State Battery Electrode Voids for Crack and Peeling Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cracks and interfacial peeling in all-solid-state batteries lead to increased internal resistance and deterioration of cycle characteristics, and existing solutions complicate the structure and increase thickness.
Innovation Solution
Incorporating anisotropic voids with a specific aspect ratio in the positive and negative electrode layers, along with optional voids in the side margin layers, to absorb internal stress and prevent cracking and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three solid electrolyte layers with different porosities are introduced to suppress cracks, then crack suppression is improved, but device complexity increases and manufacturing becomes difficult
Solution Approach 1:
The invention extracts the stress absorption function from the solid electrolyte layer and relocates it to the electrode layer by introducing voids directly into the positive or negative electrode. This eliminates the need for multiple porous solid electrolyte layers while maintaining crack suppression capability.
Solution Approach 2:
The electrode layer is given dual functionality: it serves both as the electroactive component and as the stress absorption medium through the inclusion of voids. This multi-functionality eliminates the need for separate stress management layers.
2Reliability
If three solid electrolyte layers with different porosities are introduced to suppress cracks, then crack suppression is improved, but the thickness of the battery increases
Solution Approach 1:
The stress absorption function is extracted from separate electrolyte layers and integrated into the electrode layer itself, eliminating the need for additional thickness-d consuming layers while maintaining crack suppression.
3Stress or pressure
If voids with aspect ratio of 2 or more are introduced to relax internal stress, then stress relaxation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention specifies a practical parameter range for void aspect ratio (2-29) that balances stress relaxation effectiveness with manufacturability. This parameter optimization enables effective stress management without requiring extreme manufacturing precision.
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 anisotropic voids effectively suppress cracks and peeling at the laminated interface, maintaining battery integrity while reducing thickness and simplifying manufacturing.
Implementation Method 1
the internal stress generated in the all-solid-state battery can be relaxed and the occurrence of cracks or interfacial peeling can be absorbed
Data Source
AI summary
This all-solid-state battery includes a positive electrode layer, a negative electrode layer, and a solid electrolyte layer positioned between the positive electrode layer and the negative electrode layer, the positive electrode layer includes a positive electrode current collector and a positive electrode active material layer which is in contact with the positive electrode current collector, the negative electrode layer includes a negative electrode current collector and a negative electrode active material layer which is in contact with the negative electrode current collector, at least one of the positive electrode active material layer and the negative electrode active material layer has a plurality of voids therein, and the plurality of voids include an anisotropic void in which an aspect ratio obtained by dividing a length in a major axis direction by a length in a minor axis direction is 2 or more and 29 or less.