S-F Passivated Anode Structure for Stable SEI Formation
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Solution Overview
Problem
Current secondary batteries face challenges in achieving cost-effectiveness, improved energy density, stability, and extended lifespan, particularly for medium to large-scale applications such as electric vehicles and energy storage systems, where existing electrodes do not adequately address these requirements.
Innovation Solution
A method for manufacturing a secondary battery with a negative electrode featuring a metal substrate coated with a passivation layer containing sulfur (S) and fluorine (F), which forms a stable SEI layer during charging and discharging, enhancing charge/discharge efficiency and lifespan, and includes a patterning process to control surface area and thickness for improved flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passivation layer containing S and F is formed on the metal substrate through surface treatment, then the stability and lifespan of the secondary battery are improved due to stable SEI layer formation, but the manufacturing process complexity increases
Solution Approach 1:
The passivation layer is formed on the metal substrate through surface treatment before the battery assembly process. This preliminary action ensures that the SEI layer forms stably during subsequent charging-discharging cycles, improving battery lifespan without requiring complex modifications during manufacturing.
Solution Approach 2:
The surface treatment process introduces specific elements (S and F) into the passivation layer by controlling chemical parameters during treatment. This parameter control enables stable SEI layer formation, enhancing battery reliability while maintaining a manageable manufacturing process.
2Power
If the metal substrate undergoes surface treatment to form a passivation layer, then charge/discharge efficiency and capacity are improved, but manufacturing cost increases
Solution Approach 1:
The surface treatment process optimizes the chemical composition of the passivation layer by controlling the incorporation of S and F elements. This parameter optimization enhances charge/discharge efficiency and capacity while keeping the treatment process cost-effective for manufacturing.
3Adaptability or versatility
If the passivation layer thickness is controlled through patterning process, then flexibility of the electrode structure is improved, but manufacturing complexity increases
Solution Approach 1:
The patterning process creates regions with different passivation layer thicknesses on the metal substrate. This local variation in thickness allows the electrode structure to achieve desired flexibility characteristics in specific areas while maintaining overall structural integrity.
Solution Approach 2:
The passivation layer thickness is controlled through patterning before battery assembly. This preliminary structuring enables the electrode to achieve optimal flexibility for medium to large-scale applications without requiring complex post-assembly modifications.
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 proposed solution results in a secondary battery with improved charge/discharge efficiency, capacity, and lifespan, while also reducing manufacturing costs and simplifying the production process, making it suitable for medium to large-scale energy storage applications.
Implementation Method 1
surface treating the metal substrate to form a passivation layer including S and F
Implementation Method 2
an SEI layer may be formed by using the passivation layer in a process of charging and discharging the secondary battery
Data Source
AI summary
A method for manufacturing a secondary battery is provided. The method for manufacturing a secondary battery may comprise the steps of: preparing a metal substrate; surface treating the metal substrate to form a passivation layer comprising S and F; and using the metal substrate on which the passivation layer is formed as an anode to manufacture a secondary battery.