Solid-State Battery Positive Electrode Guide for Cracking Prevention
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Solution Overview
Problem
Solid-state batteries face issues with cracking during lamination pressing and short-circuiting due to contact with tabs, which existing methods have not adequately addressed.
Innovation Solution
A positive electrode for solid-state batteries is designed with a guide provided on its outer periphery, made of an electrically insulating material, to disperse pressure and prevent short-circuiting, featuring specific thickness and recessed portion configurations to support the active material layer and tab structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lamination pressing is performed at high pressure to improve manufacturing precision, then the bonding strength between layers is improved, but cracking occurs in the active material layer
Solution Approach 1:
A pressing-resistant layer is provided between the active material layer and the pressing plate before lamination pressing, to cushion and distribute the high pressure applied during pressing. This prevents direct concentration of pressure on the brittle active material layer, thereby preventing cracking while still achieving good lamination bonding.
Solution Approach 2:
The pressing-resistant layer acts as an intermediary element between the pressing plate and the active material layer. It mediates the pressure transmission, converting concentrated point pressure into distributed area pressure, thus protecting the active material layer from damage during the lamination process.
2Volume of moving object
If the active material layer is made thin to reduce battery size, then the battery compactness is improved, but the layer becomes more susceptible to cracking during pressing
Solution Approach 1:
The pressing-resistant layer is placed beforehand to protect the thin active material layer from cracking during pressing, enabling the use of thinner layers without compromising structural integrity during manufacturing.
Solution Approach 2:
The pressing-resistant layer functions as a protective thin film that provides mechanical support to the active material layer during pressing, allowing the active material layer to be made thinner while maintaining resistance to pressing-induced damage.
3Reliability
If tabs are extended to improve electrical connection, then the electrical conductivity is improved, but short-circuiting occurs due to tab contact with the opposite electrode
Solution Approach 1:
An electrically insulating layer is provided as an intermediary between the tab and the opposite electrode, allowing the tab to extend for good electrical connection while the insulating layer prevents harmful short-circuiting by blocking electrical contact with the opposite electrode.
Solution Approach 2:
The electrically insulating layer is applied locally at the tab region where short-circuiting risk exists, rather than throughout the entire electrode. This maintains electrical conductivity where needed (at the connection point) while providing insulation where harmful contact could occur.
Data Source
AI summary
A positive electrode for a solid-state battery, a manufacturing method of the positive electrode for the solid-state battery, and the solid-state battery are provided such that the occurrence of cracking during lamination pressing at the time of manufacturing the solid-state battery and short-circuiting due to contact with a tab can be suppressed.A guide is provided on the outer periphery of a positive electrode active material layer, whereby pressure applied during the lamination pressing is dispersed, and short-circuiting due to contact with a tab is suppressed.Specifically, the guide is provided on at least two adjoining sides of the outer periphery of the positive electrode active material layer of a surface having the positive electrode active material layer.