Stainless Steel Battery Interface Passivation for Cycling Stability
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Solution Overview
Problem
Existing lithium-ion battery technologies fail to address the corrosion and corrosion of stainless steel layer with a stainless steel layer on the surface of the battery component, leading to poor cycling stability and performance due to direct contact with the electrolyte.
Innovation Solution
A passivation layer is formed on the stainless steel layer using a compound represented by Formula 1, which prevents direct contact between the electrolyte and the stainless steel layer, thereby inhibiting corrosion and electrolyte decomposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If welding operations are performed on battery components with stainless steel coatings, then battery assembly and manufacturing are enabled, but the coatings are damaged and side reactions occur between the electrolyte and stainless steel, leading to poor cycling stability
Solution Approach 1:
The patent applies preliminary action by forming a passivation layer on the stainless steel surface before the battery is filled with electrolyte. The passivation layer is formed during the manufacturing process through controlled oxidation or chemical treatment, creating a protective barrier that prevents subsequent side reactions between the electrolyte and stainless steel at welding positions. This preliminary protective measure ensures that even though welding damages the original coating, the exposed stainless steel remains protected from harmful reactions.
2Device complexity
If the stainless steel layer is directly exposed to the electrolyte, then manufacturing simplicity is maintained, but corrosion occurs and battery performance declines
Solution Approach 1:
The patent introduces an intermediary substance - a passivation layer - that forms on the stainless steel surface. This passivation layer acts as a mediator between the electrolyte and the stainless steel layer, preventing direct contact and thus avoiding corrosion and side reactions. The passivation layer can be formed through controlled chemical oxidation or by introducing specific additives into the electrolyte that promote protective film formation on the stainless steel surface.
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 passivation layer enhances cycling stability and electrochemical performance by preventing corrosion of the stainless steel layer and reducing electrolyte consumption.
Implementation Method 1
a passivation layer can be formed on the surface of the stainless steel layer by adopting the compound represented by Formula 1, facilitating reducing or avoiding side reactions between the stainless steel layer with a damaged coating and the electrolyte
Data Source
AI summary
Provided is a battery. The battery includes an electrolyte and a battery component in contact with the electrolyte. At least a contact surface of the battery component contacting with the electrolyte includes a stainless steel layer. The electrolyte includes a compound represented by Formula 1: