Sodium-Ion Battery Electrolyte for High-Temperature Cycle Stability
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Solution Overview
Problem
Nonaqueous sodium ion batteries face challenges in cycle characteristics and high-temperature storage characteristics, particularly in applications like automobiles, with significant gas generation during high-temperature cycle tests.
Innovation Solution
An electrolyte solution for nonaqueous sodium ion batteries containing fluorosulfate, compounds with at least two isocyanate groups, specific sodium salts, and nonaqueous solvents, which form an effective film on electrodes to enhance cycle and high-temperature performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used in nonaqueous sodium ion batteries, then basic battery operation is achieved, but cycle characteristics at high temperature deteriorate and gas generation increases
Solution Approach 1:
The patent introduces a fluorosulfate compound as an intermediary substance in the electrolyte solution that mediates between the electrodes and the electrolyte. This compound forms a protective interface layer that prevents direct harmful interactions, thereby reducing gas generation while maintaining reliable cycle performance at high temperatures.
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte solution by incorporating fluorosulfate compounds with specific molecular structures. This parameter change transforms the electrolyte's chemical properties, enabling it to resist decomposition and reduce gas generation under high-temperature cycling conditions while preserving battery reliability.
2Reliability
If conventional electrolyte solutions are used in nonaqueous sodium ion batteries, then basic battery operation is achieved, but high-temperature storage characteristic deteriorates
Solution Approach 1:
The fluorosulfate compound acts as a thermal intermediary that stabilizes the electrolyte system at high temperatures. It forms a thermally stable protective layer on electrode surfaces, preventing direct thermal degradation of the electrolyte and improving high-temperature storage characteristics while maintaining basic battery operation.
Solution Approach 2:
The patent creates a composite electrolyte system by combining fluorosulfate compounds with conventional electrolyte components. This composite material exhibits enhanced thermal stability and resistance to decomposition at high temperatures, thereby improving storage characteristics without compromising basic battery functionality.
3Reliability
If additives are added to prevent electrolyte decomposition on electrode surfaces, then cycle characteristic improves, but device complexity increases
Solution Approach 1:
The fluorosulfate compound serves multiple functions simultaneously: it prevents electrolyte decomposition on electrode surfaces, reduces gas generation, and improves high-temperature storage characteristics. This multi-functionality achieves enhanced cycle performance without proportionally increasing electrolyte composition complexity, as a single compound addresses multiple degradation mechanisms.
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 cycle characteristics and reduces gas generation during high-temperature tests, enhancing the high-temperature storage performance of nonaqueous sodium ion batteries.
Implementation Method 1
containing (I) a fluorosulfate, (II) at least one selected from the group consisting of a compound having at least two isocyanate groups... which form an effective film on electrodes
Implementation Method 2
form an effective film on electrodes to enhance cycle and high-temperature performance
Implementation Method 3
decomposition of the electrolyte solution on the surfaces of active positive and negative electrodes
Data Source
Figure 1~2
Figure 3
AI summary
The present disclosure provides an electrolyte solution for a nonaqueous sodium ion battery containing (I) a fluorosulfate, (II) at least one selected from the group consisting of a compound having at least two isocyanate groups, a specific compound represented by the formula (1), a specific compound represented by the formula (2), and a specific compound represented by the formula (5), (III) a sodium salt, and (IV) a nonaqueous solvent, a nonaqueous sodium ion battery having at least a positive electrode, a negative electrode, and the electrolyte solution for a nonaqueous sodium ion battery, and a method for producing a nonaqueous sodium ion battery.