Fluorinated Ether Electrolyte for High-Temperature Sodium Battery Cycling
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Solution Overview
Problem
Sodium secondary batteries suffer from poor high-temperature cycling performance and severe high-temperature gas generation, limiting their application in large-scale energy storage systems.
Innovation Solution
Incorporation of a fluorinated ether compound as an additive in the electrolyte, which forms a stable and uniform solid electrolyte interface (SEI) on the negative electrode, reducing direct contact between the electrode and solvent, thereby enhancing structural stability and minimizing side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional electrolytes are used in sodium secondary batteries, then the batteries can operate at high temperatures, but the high-temperature cycling performance deteriorates and severe gas generation occurs
Solution Approach 1:
The fluorinated ether compound acts as an intermediary substance that mediates between the electrode and the conventional electrolyte. It forms a protective SEI layer on the electrode surface that prevents direct harmful interactions while allowing ionic conduction, thus enabling high-temperature operation without the severe gas generation and performance deterioration that would otherwise occur
Solution Approach 2:
The invention changes the chemical composition parameters of the electrolyte by introducing fluorinated ether compounds with specific molecular structures (containing F-O-C bonds). This parameter change modifies the electrolyte's interaction with the electrode, creating a stable SEI layer that suppresses gas generation and improves cycling stability at high temperatures
2Temperature
If conventional electrolytes are used in sodium secondary batteries, then the batteries can function at high temperatures, but severe gas generation occurs that limits application
Solution Approach 1:
The fluorinated ether compound serves as a mediator that forms an intervening SEI layer between the electrode and the bulk electrolyte. This intermediate layer blocks the pathways that would otherwise lead to severe gas generation reactions, allowing high-temperature operation without the harmful gas evolution that limits practical application
Solution Approach 2:
The invention converts the potential harm of high-temperature electrolyte decomposition into a benefit by having the fluorinated ether compound preferentially decompose first to form a stable protective layer. This layer then prevents further harmful decomposition and gas generation, turning the initial harmful reaction into a protective mechanism
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
Improves high-temperature cycling performance, reduces gas generation, and enhances electrochemical and safety performance of sodium secondary batteries.
Implementation Method 1
the fluorinated ether compound has a low lowest unoccupied molecular orbital (LUMO) absolute value, which allows it to be reduced on a surface of the negative electrode, forming an SEI mainly composed of an organic fluoride
Data Source
AI summary
This application provides an electrolyte for a sodium secondary battery, a sodium secondary battery, and an electrical apparatus. An electrolyte for a sodium secondary battery is provided, where the electrolyte includes an additive, and the additive includes a fluorinated ether compound. In this application, through the addition of an additive, including a fluorinated ether compound, in the electrolyte, the high-temperature cycling performance of the battery can be improved, the high-temperature gas generation phenomenon of the battery can be alleviated, and the electrochemical performance and safety performance of the battery can be improved.