Cyclic Phosphazene Solvent Electrolyte Flame Retardancy
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Solution Overview
Problem
Conventional non-aqueous electrolytic solutions require a narrow range for the ratio of liquid phosphazene flame retardant, limiting flexibility and safety in abnormal conditions, as excessive amounts inhibit ion movement while insufficient amounts compromise flame retardancy.
Innovation Solution
A non-aqueous electrolytic solution comprising a glyme solvent and a cyclic phosphazene solvent, allowing for arbitrary adjustment of the phosphazene flame retardant ratio, ensuring homogeneous mixing and enhanced safety and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ratio of liquid phosphazene flame retardant is increased to improve flame retardancy, then safety is improved, but ion movement is inhibited and charge/discharge process cannot occur properly
Solution Approach 1:
The patent changes the chemical structure parameters of the phosphazene compound by introducing specific substituents (fluorine atoms, aromatic groups, cyclic structures) to modify its properties. This allows the phosphazene to maintain flame retardancy while reducing its inhibitory effect on ion movement, resolving the contradiction between safety and productivity
Solution Approach 2:
The patent creates a composite electrolytic solution system by combining phosphazene flame retardant with specific solvents (cyclic carbonates, chain carbonates, cyclic carboxylic acid esters) and lithium salts. This composite approach allows the phosphazene to function as a flame retardant while the solvent system maintains ion mobility, resolving the contradiction between flame retardancy and ion movement
2Productivity
If the ratio of liquid phosphazene flame retardant is decreased to improve ion movement, then charge/discharge process is improved, but flame retardancy is compromised
Solution Approach 1:
The patent modifies the molecular parameters of phosphazene by adding specific functional groups and substituents that enhance its solubility and compatibility with the electrolyte system. This allows higher concentrations of phosphazene to be used without compromising charge/discharge performance, while maintaining flame retardancy
Solution Approach 2:
The patent introduces specific local structural features (fluorine substitution, aromatic groups, cyclic structures) into the phosphazene molecule to create regions with different properties. These local modifications allow the phosphazene to maintain flame retardant function while reducing its negative impact on ion transport in specific areas of the electrolyte system
3Ease of manufacture
If conventional electrolytic solutions are used to ensure basic performance, then manufacturing is simple, but safety in abnormal conditions is insufficient
Solution Approach 1:
The patent extracts the flame retardant function from the conventional electrolyte system by adding phosphazene as a separate functional component. This allows the base electrolyte to maintain its simple composition and manufacturing process, while the phosphazene additive provides the enhanced safety function
Solution Approach 2:
The patent makes the phosphazene compound multi-functional by designing it to simultaneously provide flame retardancy, maintain electrochemical stability, and support ion transport. This allows a single additive to address multiple requirements, maintaining manufacturing simplicity while enhancing safety
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 solution provides a safer and more flexible electrolytic solution with improved flame retardancy and ion mobility, enabling higher phosphazene solvent ratios for increased safety and performance beyond conventional limits.
Implementation Method 1
the phosphazene solvent is a cyclic phosphazene compound... ensuring homogeneous mixing and enhanced safety and performance
Implementation Method 2
allowing for arbitrary adjustment of the phosphazene flame retardant ratio, ensuring homogeneous mixing
Implementation Method 3
an alkali metal salt composed of an alkali metal cation and an anion, the alkali metal salt being dissolved in the solvent component
Data Source
AI summary
A non-aqueous electrolytic solution of the present invention includes: a solvent component including a glyme solvent and a phosphazene solvent; and an alkali metal salt composed of an alkali metal cation and an anion, the alkali metal salt being dissolved in the solvent component. The phosphazene solvent is a cyclic phosphazene compound represented by the formula (1).where X1 to X6 each independently represent a halogen atom or OR1, R1 is a substituted or unsubstituted aromatic group or a substituted or unsubstituted saturated aliphatic group, the aromatic group and the saturated aliphatic group each optionally contain a halogen atom, a nitrogen atom, an oxygen atom, a sulfur atom, or a silicon atom, and the saturated aliphatic group is linear or cyclic.