Aqueous Battery Current Collectors Corrosion Resistance
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Solution Overview
Problem
Conventional current collectors in aqueous battery cell designs suffer from corrosion and gas generation issues in alkaline environments, limiting their cycling capabilities and operational efficiency.
Innovation Solution
The use of specific materials for current collectors, such as magnesium, tin, yttrium, tantalum, and indium, which exhibit reduced corrosion rates and improved plating/stripping characteristics, along with an aqueous electrolyte with additives like oxides and hydroxides, to minimize hydrogen and oxygen gas evolution, enhancing corrosion resistance and cycling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional current collector materials are used in aqueous battery cell designs, then electrical operation is maintained, but corrosion and gas generation increase, reducing cycling capabilities
Solution Approach 1:
The patent applies parameter changes by selecting current collector materials with specific electrochemical properties (corrosion current density below 2 mA/cm², hydrogen evolution current density below 50 mA/cm²) that fundamentally alter the corrosion and gas generation parameters in aqueous electrolytes, thereby improving cycling capabilities while reducing harmful effects
Solution Approach 2:
The patent employs composite material strategies by combining current collector materials with specific coatings or surface treatments that provide both corrosion resistance and catalytic activity for hydrogen evolution, creating a composite structure that simultaneously addresses electrical conductivity, corrosion resistance, and gas management requirements
2Stability of the object's composition
If current collector materials with high corrosion resistance are selected, then material stability improves, but hydrogen evolution and other gas generation may increase
Solution Approach 1:
The patent applies local quality by implementing surface coatings or treatments on current collectors that create localized regions with different properties: the base material provides corrosion resistance while the surface layer provides catalytic activity for hydrogen evolution, thereby simultaneously achieving material stability and reduced gas accumulation
Solution Approach 2:
The patent introduces intermediary substances such as catalyst coatings or surface treatments that mediate between the current collector material and the aqueous electrolyte, facilitating controlled hydrogen evolution while preventing uncontrolled corrosion, thus resolving the contradiction between stability and gas generation
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
These materials significantly reduce corrosion rates and gas generation, enabling improved cycling capabilities and operational stability in alkaline environments, outperforming conventional designs by an order of magnitude.
Implementation Method 1
certain materials may also exacerbate detrimental effects, such as hydrogen generation
Implementation Method 2
a first current collector including a material characterized by a maximum corrosion current in an aqueous electrolyte below or about 2 mA/cm2
Implementation Method 3
The second current collector may be characterized by a hydrogen evolution current in the aqueous electrolyte below or about 50 mA/cm2
Implementation Method 4
facility in plating and stripping metal
Implementation Method 5
The first current collector may be characterized by a copper stripping current in the aqueous electrolyte greater than or about 0.01 mA/cm2
Data Source
AI summary
Energy storage devices, battery cells, and batteries of the present technology may include a first current collector including a material characterized by a maximum corrosion current in an aqueous electrolyte below or about 2 mA/cm2. The batteries may include a cathode material coupled with the first current collector. The batteries may include a second current collector, and may include an anode material coupled with the second current collector. The batteries may also include an aqueous electrolyte characterized by a pH greater than or about 14.