Copper Foil Antioxidant Coating for 210°C Heat Resistance
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Solution Overview
Problem
Conventional lithium battery copper foil treatments increase cost and sewage treatment burden while improving heat resistance, and fail to prevent high-temperature oxidation effectively.
Innovation Solution
A high heat-resistant antioxidant solution for lithium battery copper foil is developed, comprising hexavalent chromium and organic compounds with heteroatoms (N, O, S, or P), forming a dense anti-oxidation layer on the copper foil surface through coordination bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multiple heavy metal elements (nickel, zinc, chromium) are added to hexavalent chromium plating solution to form composite metal anti-oxidation layer, then heat-resistant temperature is improved, but manufacturing cost and sewage treatment cost increase
Solution Approach 1:
The patent changes the chemical composition parameters of the plating solution by introducing organic compounds containing heteroatoms (N, O, S, or P) to replace heavy metal elements. This parameter change allows achieving high heat resistance (above 210°C) without using nickel, zinc, or chromium additives, thereby reducing both manufacturing costs and sewage treatment costs while maintaining the anti-oxidation function.
Solution Approach 2:
The patent creates a composite anti-oxidation layer composed of hexavalent chromium and organic compounds containing heteroatoms. This composite structure combines the heat resistance of chromium with the organic compounds' ability to form stable coordination bonds, achieving superior heat resistance above 210°C without relying on multiple heavy metal elements, thus solving the cost and environmental issues.
2Ease of manufacture
If conventional hexavalent chromium plating is used without organic compounds, then manufacturing process is simple, but heat-resistant temperature is limited to about 150°C and cannot prevent high-temperature oxidation
Solution Approach 1:
The patent merges hexavalent chromium plating with organic compound-containing heteroatoms in a single plating process. The organic compounds (such as benzotriazole, 2-thiol benzotriazole, nitrogen-containing azoles, hydroxyethylene diphosphate, aminotrimethylenephosphonic acid, sodium ethylenediamine tetramethylenephosphate, ethanol diamine tetraacetic acid, sodium gluconate, sodium potassium tartrate, or water-soluble siloxane) work synergistically with chromium to form a composite anti-oxidation layer that achieves heat resistance above 210°C while maintaining manufacturing simplicity.
Solution Approach 2:
The organic compounds containing heteroatoms act as intermediaries that enhance the heat resistance of the chromium-based anti-oxidation layer. These compounds form coordination bonds with copper atoms, creating a stable protective layer that prevents oxidation at high temperatures, thereby mediating between the simple chromium plating process and the requirement for high heat resistance.
3Reliability
If copper foil is subjected to traditional anti-oxidation treatment at 150°C, then oxidation is prevented at normal temperatures, but copper foil deteriorates when temperature exceeds 210°C due to high-temperature oxidation
Solution Approach 1:
The patent creates a composite anti-oxidation layer combining hexavalent chromium and organic compounds containing heteroatoms. This composite structure provides dual functionality: preventing oxidation at normal temperatures (maintaining reliability) and resisting high-temperature oxidation up to 210°C or above, thereby eliminating the temperature limitation of conventional treatments.
Solution Approach 2:
The patent changes the chemical composition and structure of the anti-oxidation layer by incorporating organic compounds with heteroatoms (N, O, S, or P). This parameter change enables the layer to maintain its protective function across a wider temperature range, from normal operating temperatures up to 210°C and above, preventing copper foil deterioration at high temperatures.
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 copper foil's heat resistance to 210°C without oxidative discoloration, improving battery performance and reducing costs by replacing heavy metals, thus addressing sewage treatment issues.
Implementation Method 1
By adding organic compounds containing heteroatoms, it forms coordination bonds with the empty orbitals of copper, so that a dense anti-oxidation layer is formed on the surface of the copper foil
Implementation Method 2
put the copper foil into a hexavalent chromium solution for electroplating, so that a passivation layer is formed on the surface of the copper foil to prevent oxidation
Data Source
AI summary
The invention provides a high heat-resistant antioxidant solution for lithium battery copper foil, including hexavalent chromium and organic compounds containing heteroatoms, and the heteroatoms include N, O, S or P.