Electrolytic Solution Mixing Perfluoropolyether with Fluorinated Phosphate
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Solution Overview
Problem
Existing nonaqueous electrolytic solutions face limitations in mixing perfluoropolyether due to low compatibility, restricting its proportion and affecting performance, particularly in lithium ion batteries where high safety and uniform mixing are required.
Innovation Solution
A nonaqueous electrolytic solution comprising a perfluoropolyether and a fluorinated phosphate solvent, which allows for uniform mixing of perfluoropolyether at higher ratios without phase separation, enhancing safety and ionic conductivity while maintaining flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perfluoropolyether is added to nonaqueous electrolytic solution, then safety and flame retardancy are improved, but mixing uniformity deteriorates due to low compatibility
Solution Approach 1:
The patent introduces a fluorinated phosphate compound as an intermediary substance that mediates between perfluoropolyether and conventional nonaqueous solvents. This intermediary improves mutual solubility and mixing uniformity, enabling higher concentrations of perfluoropolyether (5-50 vol%) to be incorporated into the electrolytic solution while maintaining homogeneous composition and preventing phase separation.
2Object-affected harmful factors
If perfluoropolyether proportion is increased to improve safety, then flame retardancy is enhanced, but phase separation occurs
Solution Approach 1:
The fluorinated phosphate compound acts as a mediator that prevents phase separation even at high perfluoropolyether concentrations (5-50 vol%). It enhances mutual solubility between the fluorinated and hydrocarbon components, allowing the system to maintain single-phase homogeneous structure while achieving improved flame retardancy.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolytic solution by introducing fluorinated phosphate compounds with specific molecular structures (containing CF3 groups and phosphate esters). This parameter change fundamentally alters the mixing behavior and phase stability of the system, enabling high perfluoropolyether content without phase separation.
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 achieves high safety and ionic conductivity, enabling the use of perfluoropolyether at higher concentrations, improving the performance and stability of lithium secondary batteries by ensuring uniform compatibility and preventing phase separation.
Implementation Method 1
The nonaqueous solvent contains a perfluoropolyether and a fluorinated phosphate
Implementation Method 2
The alkali metal salt is dissolved in the nonaqueous solvent
Data Source
AI summary
Provided is an electrolytic solution including a nonaqueous solvent and an alkali metal salt. The alkali metal salt is dissolved in the nonaqueous solvent. The nonaqueous solvent contains a perfluoropolyether and a fluorinated phosphate. Also provided is a battery including the electrolytic solution, a positive electrode containing a positive electrode active material that can occlude and release an alkali metal cation, and a negative electrode containing a negative electrode active material that can occlude and release the alkali metal cation.