Fluoride-Protected Positive Electrode Plate for Stable Li-Ion Cathodes
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Solution Overview
Problem
Lithium-ion batteries experience performance deterioration due to contact between the positive electrode material and air leading to degradation, and interfacial reactions with the electrolyte, which affect stability and efficiency.
Innovation Solution
A positive electrode plate with a protective film containing fluoride is applied, which reduces contact between the positive electrode material and air and mitigates interfacial reactions with the electrolyte, enhancing stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the positive electrode material is exposed to air, then manufacturing process is simplified, but the positive electrode material degrades and performance deteriorates
Solution Approach 1:
A protective film is formed on the surface of the positive electrode material before battery assembly, creating a pre-protective barrier that prevents air exposure during manufacturing and handling. This preliminary protective action eliminates the need for complex inert atmosphere handling while maintaining material stability.
Solution Approach 2:
The protective film acts as an intermediary layer between the positive electrode material and the external environment (air and electrolyte). This intermediate barrier prevents direct contact and harmful reactions, allowing the material to be handled in normal conditions while maintaining stability.
2Productivity
If the positive electrode material contacts the electrolyte, then battery operation is enabled, but interfacial side reactions occur reducing performance
Solution Approach 1:
The protective film provides localized protection at the interface between the positive electrode material and electrolyte. The film has different properties from the bulk material, creating a specialized interfacial layer that allows ionic transport while preventing harmful chemical reactions, thus enabling operation with improved stability.
3Reliability
If a protective film is added to the positive electrode, then stability and performance are improved, but device complexity increases
Solution Approach 1:
A thin protective film is applied to the surface of the positive electrode material. This thin film layer provides effective protection against air and electrolyte while adding minimal structural complexity and maintaining the overall simplicity of the battery design.
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 protective film effectively minimizes contact and reactions, improving the stability and performance of the positive electrode material, thereby enhancing the battery's overall performance.
Implementation Method 1
The protective film is disposed on the surface of the coating to improve the performance of the positive electrode material. This reduces the opportunity for contact between the positive electrode material and air
Implementation Method 2
mitigates the probability of interfacial reactions between the positive electrode material and the electrolyte
Implementation Method 3
To allow the protective film to effectively reduce the opportunity for contact between the electrolyte and the coating while ensuring a favorable migration rate for lithium ions, the thickness range of the protective film is 1 nm to 50 nm
Data Source
AI summary
The disclosure relates to battery technology and provides a positive electrode plate, its preparation method, an electrode assembly, a battery cell, a battery, and an electric apparatus. The positive electrode plate includes a current collector and a coating applied to at least one side of the current collector. A protective film containing a fluoride material is formed on the surface of the coating. The film reduces exposure of the positive electrode material to air, which otherwise degrades performance, and limits direct contact with electrolytes, which may cause interfacial side reactions. By mitigating these effects, the protective film enhances the chemical stability of the electrode material and improves overall battery performance.