Coated Battery Current Collector for Degreasing-Free Adhesion
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Solution Overview
Problem
The cohesion between the current collector and the active material layer in secondary batteries is influenced by the wettability of the current collector's surface, and the degreasing process required to enhance wettability is energy-intensive and costly, affecting the economic efficiency and performance of the battery.
Innovation Solution
A current collector with a conductive substrate coated with a layer containing a second metal, carbon, phosphorus, and oxygen, which improves wettability even without a degreasing process, enhancing cohesion and conductivity with the active material layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a degreasing process is performed on the aluminum substrate to improve wettability, then the cohesion between the current collector and active material layer is improved, but the manufacturing cost and energy consumption increase significantly
Solution Approach 1:
The invention applies a surface treatment process before electrodeposition that modifies the aluminum substrate surface to enhance wettability and adhesion in advance, eliminating the need for subsequent degreasing processes. This preliminary surface preparation ensures that the active material layer adheres properly without requiring energy-intensive degreasing treatments later in the manufacturing process.
Solution Approach 2:
The invention extracts and removes the degreasing process from the manufacturing sequence by replacing it with an alternative surface treatment method. By taking out the harmful and energy-consuming degreasing step, the process achieves the same adhesion improvement through a different mechanism that does not require solvent-based or high-energy treatments.
2Strength
If a degreasing process is performed on the aluminum substrate to improve wettability, then the cohesion between the current collector and active material layer is improved, but the manufacturing cost increases
Solution Approach 1:
The surface treatment is performed as a preliminary step that simplifies subsequent manufacturing processes. By preparing the surface in advance to have optimal wettability and adhesion properties, the invention eliminates the need for expensive degreasing operations, thereby reducing overall manufacturing costs while ensuring proper cohesion.
Solution Approach 2:
The invention uses a cost-effective surface treatment approach that replaces expensive degreasing processes. The treatment creates a surface layer that provides sufficient adhesion without requiring costly solvents, equipment, or operational expenses associated with traditional degreasing methods.
3Shape
If a degreasing process is performed to improve wettability, then the surface wettability is improved, but wastewater is generated and environmental pollution occurs
Solution Approach 1:
The invention converts the potentially harmful degreasing process into a beneficial environmental outcome by using an alternative surface treatment method. Instead of generating wastewater through solvent-based or chemical degreasing, the process achieves improved wettability through a treatment that does not produce harmful effluents, thereby eliminating the environmental harm while maintaining the desired surface properties.
Solution Approach 2:
The invention extracts and eliminates the wastewater-generating degreasing step from the manufacturing process. By removing this harmful process and replacing it with an environmentally friendly surface treatment, the invention achieves the same wettability improvement without producing polluted wastewater that would require treatment and disposal.
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 coated current collector achieves improved wettability, cohesion, and conductivity, reducing detachment of the active material layer during charging and discharging, and enhances the cycle characteristics of the secondary battery while maintaining economic efficiency.
Implementation Method 1
The wettability of the surface of the current collector is a major factor in the cohesion between the current collector and the active material layer
Implementation Method 2
improve conductivity with electrode active materials for copper films, nickel-plated copper films, and aluminum films used as collectors
Data Source
AI summary
The present invention relates to a current collector for a secondary battery and a method of preparing the same, and more specifically, comprises a conductive substrate comprising a first metal; and a coating layer coated on a surface of the conductive substrate. The coating layer comprises a second metal, carbon (C), phosphorus (P), and oxygen (O), and the second metal is different from the first metal, and a first water contact angle (A) of a surface of the coating layer is 1° to 45°.