Ceramic Separator Surface Quality for Battery Safety
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Solution Overview
Problem
Conventional lithium-ion battery cells with SO2-containing electrolytes face safety risks due to metallic lithium deposition, which can lead to internal short circuits and reduced performance, primarily because existing ceramic separators are brittle and prone to cracking, allowing lithium whiskers to grow through and cause electrical shorts.
Innovation Solution
A rigid electrode-separator element with a high-surface-quality ceramic separator layer applied to the electrodes, ensuring mechanical and chemical stability, preventing lithium whiskers from passing through and maintaining integrity during assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ceramic separator layer is used to prevent lithium deposition, then safety is improved, but the separator becomes brittle and prone to cracking
Solution Approach 1:
The patent applies composite materials by combining the ceramic separator layer with a flexible support structure (such as a porous substrate or membrane). This composite construction allows the ceramic to provide chemical stability and lithium deposition prevention while the flexible support provides mechanical strength and crack resistance, resolving the contradiction between safety improvement and mechanical brittleness
Solution Approach 2:
The patent modifies the physical and chemical parameters of the separator system by controlling the ceramic layer thickness, porosity, and composition. By optimizing these parameters, the separator maintains its protective function against lithium deposition while improving flexibility and reducing brittleness, thus balancing safety and mechanical stability
2Reliability
If a ceramic separator layer is applied to prevent lithium whiskers, then electrical short prevention is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies the ceramic separator layer during the electrode manufacturing process itself, before battery assembly. This preliminary application integrates the separator into the electrode structure, eliminating the need for separate separator installation steps and reducing overall manufacturing complexity while maintaining electrical short prevention
Solution Approach 2:
The patent merges the separator function with the electrode structure by applying the ceramic layer directly to the electrode substrate. This consolidation combines multiple functions (electrode support, separator, and lithium deposition barrier) into a single integrated component, simplifying the overall battery structure and manufacturing process
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 solution enhances the mechanical and chemical stability of the separator layer, preventing lithium whiskers from causing electrical shorts and maintaining the battery's performance and safety by ensuring the ceramic separator remains intact during electrode stacking and operation.
Implementation Method 1
a ceramic separator layer (6) disposed on the surface of the electrode
Implementation Method 2
The surface of the electrode-separator element has a surface quality that prevents cracking in the separator layer when the electrode-separator element is assembled or assembled to form a stack
Data Source
Figure 1~4
Figure 5A~7
AI summary
The invention relates to an electrode separator element for electrochemical battery cells, said element comprising a fixed electrode (4, 5) which has an active mass, and comprising a ceramic separator layer (6). The electrode separator element is characterised in that the surface of the electrode separator element has a surface quality which prevents crack formation in the separator layer (6) when the electrode separator element is stacked, or during a joining process to form a stack.