Patterned Battery Electrode With Gas Adsorption for Early-Cycle Gassing
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Solution Overview
Problem
Lithium secondary batteries face issues with gas generation during charging/discharging, leading to capacity deterioration, lithium precipitation, and potential explosion due to internal pressure increases, and existing methods for gas removal are inefficient and can cause electrolyte leakage.
Innovation Solution
An electrode for secondary batteries featuring a mixture layer with a pattern structure and a gas adsorption layer on the electrode current collector, where the gas adsorption layer is positioned in non-patterned regions, utilizing porous carbon materials or metal oxides to effectively absorb gases generated during charging/discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a vacuum deaeration process is used to remove gas from the battery, then gas removal effectiveness is improved, but electrolyte leakage occurs and defect rate increases
Solution Approach 1:
The patent extracts the gas removal function from the electrode structure by incorporating a gas pocket unit into the exterior material. This separate gas collection mechanism allows gas to be removed from the battery without requiring vacuum deaeration processes that would cause electrolyte leakage. The gas pocket unit is specifically designed to collect and contain gas generated during charging/discharging cycles.
Solution Approach 2:
The gas pocket unit acts as an intermediary between the electrode and the exterior material, providing a dedicated space for gas accumulation. This intermediary structure prevents gas from directly interacting with the electrolyte and electrode components, thereby avoiding electrolyte leakage while still enabling effective gas removal.
2Object-generated harmful factors
If gas pocket unit is formed on exterior material and then cut and resealed, then gas collection is achieved, but production efficiency deteriorates
Solution Approach 1:
The gas pocket unit is pre-formed as an integrated part of the exterior material before battery assembly. This preliminary formation eliminates the need for subsequent cutting and resealing operations during production, significantly improving manufacturing efficiency while maintaining the gas collection function.
Solution Approach 2:
The gas pocket unit is merged with the exterior material as a single integrated component. This combination eliminates separate processing steps for forming, cutting, and sealing the gas pocket, streamlining the production process while ensuring proper gas collection functionality.
3Ease of manufacture
If gas is not removed from the battery, then manufacturing process is simplified, but capacity deterioration and lithium precipitation occur
Solution Approach 1:
The battery structure provides self-service for gas management through the integrated gas pocket unit. Gas generated during normal operation is automatically collected in the gas pocket without requiring external vacuum deaeration equipment or complex manufacturing processes, thus maintaining manufacturing simplicity while ensuring battery performance stability.
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
This configuration enhances the stability and performance of secondary batteries by efficiently removing gases, preventing lithium extraction and maintaining battery integrity, while simplifying the manufacturing process and reducing defects.
Implementation Method 1
a gas adsorption layer disposed in a region where the mixture layer is not disposed
Implementation Method 2
the gas adsorption layers may include one or more gas adsorbents selected from the group consisting of a porous carbon material, a porous metal oxide, and a porous gel
Data Source
AI summary
An electrode for a secondary battery and an electrode assembly including the same. The electrode includes a mixture layer and a gas adsorption layers disposed on at least one surface of an electrode current collector. Since the mixture layer has a pattern structure and the gas adsorption layer is disposed in a regions where the mixture layer is not disposed, there is an advantage in that a secondary battery including the above has excellent performance and stability due to an excellent effect of removing a gas generated during initial charging/discharging of the secondary battery.