Electrode Surface Fluorination for Battery Cycle Life and Foil Corrosion
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Solution Overview
Problem
Current electric batteries, particularly lithium-ion secondary batteries, face challenges in improving cycle characteristics and preventing corrosion of current collector foils, which are crucial for their performance and durability especially when used in high-voltage applications like automobiles.
Innovation Solution
A surface-treating agent for electrode materials is developed, which includes a pyridine skeleton and fluorine. This agent forms a stable protective film on the surface of electrode active materials and current collector foils, enhancing ion conductivity and preventing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorine gas is used for surface fluorination to improve cycle characteristics, then battery performance is enhanced, but safety and handleability deteriorate due to the high reactivity and危险性 of fluorine gas
Solution Approach 1:
The patent uses an organic fluorinating agent as an intermediary substance to transfer fluorine to the electrode material surface. This intermediary approach avoids direct use of hazardous fluorine gas while achieving the desired surface fluorination effect, thus improving safety and handleability without compromising cycle characteristics
Solution Approach 2:
The patent changes the physical and chemical parameters of the fluorinating agent from gaseous fluorine (highly reactive and dangerous) to an organic compound (safer and easier to handle). This parameter change maintains the fluorination effect while dramatically improving safety and operational ease
2Reliability
If conventional surface treatment methods are used to prevent corrosion of current collector foils, then corrosion resistance is improved, but the complexity of the treatment process increases
Solution Approach 1:
The organic fluorinating agent serves multiple functions simultaneously: it provides surface fluorination for corrosion protection, enhances cycle characteristics, and improves safety. This multi-functionality eliminates the need for separate treatment steps, thereby reducing process complexity while achieving comprehensive protection
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 use of the surface-treating agent significantly improves the cycle characteristics of batteries by retaining capacity over cycles and reduces corrosion of current collector foils, leading to the development of high-performance batteries with high energy densities and improved safety and handleability.
Implementation Method 1
The surface of an electrode active material or a current collector is fluorinated by treatment with the surface-treating agent for an electrode material
Data Source
AI summary
A surface-treating agent for an electrode material includes a pyridine skeleton and fluorine. A positive electrode active material, a current collector foil, a negative electrode active material, each treated with the surface-treating agent, an electrode, and a battery, are provided. A method for producing a positive electrode active material, a method for producing a current collector foil, a method for producing a negative electrode active material, a method for producing a conductive aid, and a method for producing an electrode which are capable of improving the cycle characteristics of batteries and preventing or reducing corrosion of current collector foils, are provided.