Lithium-Ion Battery Anode Foil Perforation for Uniform Electrolyte Wetting
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Solution Overview
Problem
Existing lithium-ion battery anode collector carrier foils with prefabricated apertures compromise mechanical stability and robustness, necessitating costly and complex production processes, while impeding complete electrolyte wetting and affecting performance.
Innovation Solution
A method involving the application of a particulate auxiliary material to the anode collector carrier foil, which is compressed to create apertures during the coating process, ensuring uniform and rapid electrolyte wetting without compromising mechanical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prefabricated apertures are introduced into the carrier foil to improve electrolyte wetting, then wetting behavior is improved, but mechanical stability and robustness are reduced
Solution Approach 1:
The carrier foil is pre-coated with a coating compound containing particulate auxiliary material before compression. During the compression process, the particulate material creates apertures in the carrier foil, achieving aperture formation as a preliminary action that enables subsequent electrolyte wetting without requiring post-manufacturing modifications
Solution Approach 2:
The invention changes the physical state and properties of the carrier foil through compression, transforming it from a non-porous state to a porous state with controlled apertures. The compression process modifies the density and structure of the coating compound, enabling the particulate auxiliary material to penetrate and create apertures in the carrier foil
2Reliability
If prefabricated apertures are used to improve wetting, then electrolyte penetration is enhanced, but production process complexity and cost increase
Solution Approach 1:
The invention merges the coating application process with the aperture formation process into a single compression step. The coating compound application and the carrier foil perforation are combined into one integrated operation, eliminating the need for separate aperture creation steps and reducing production complexity
Solution Approach 2:
The coating compound itself serves dual functions: it provides the necessary coating layer and simultaneously contains the particulate auxiliary material that creates the apertures during compression. The system serves itself by using the same material layer for both coating and perforation purposes
3Reliability
If prefabricated apertures are introduced to improve wetting uniformity, then electrolyte distribution is enhanced, but mechanical robustness during handling is compromised
Solution Approach 1:
The invention applies local quality by creating apertures only in specific regions where the coating compound is applied. The particulate auxiliary material is distributed within the coating layer, ensuring apertures are formed locally where needed for electrolyte penetration, while the rest of the carrier foil maintains its full mechanical strength and integrity
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 method enables complete and uniform electrolyte wetting, enhancing current-carrying capacity, charging and discharging rates, cycling stability, and battery lifetime while maintaining mechanical robustness and avoiding costly adaptations.
Implementation Method 1
The coating compound is subsequently compressed to form an anode film on the anode collector carrier foil
Implementation Method 2
the anode collector carrier foil is perforated by the particulate auxiliary material during the compression of the coating compound
Implementation Method 3
sufficient wetting of the electrodes with electrolyte is of key importance for the attainable performance features
Data Source
AI summary
A method for producing an anode for a lithium-ion battery includes providing an anode collector carrier film and applying a coating compound onto at least one main surface of the anode collector carrier film. The coating compound contains a particulate auxiliary material. The coating compound is subsequently compressed to form an anode film on the anode collector carrier film. During the compression of the coating compound, the anode collector carrier film is perforated. A lithium-ion battery is also described.