Urethane-Terminated Perfluoropolyether Electrolytes for Lithium Ion Conductivity
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Solution Overview
Problem
Current lithium-ion batteries face challenges in achieving high lithium ion transference, stability, and ionic conductivity, which limits their performance and safety.
Innovation Solution
The development of urethane-terminated perfluoropolyether electrolytes, formulated with alkali metal salts, which enhance ionic conductivity and solubility, providing a safer and more efficient lithium ion transfer mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perfluoropolyethers terminated with methoxycarbonyl groups are used as lithium ion electrolytes, then fire resistance and lithium ion transference are improved, but ionic conductivity remains low at about 10^-5 S cm^-1 at 80°C
Solution Approach 1:
The patent changes the terminal functional groups from methoxycarbonyl to urethane groups on the perfluoropolyether chains. This chemical parameter change results in significantly improved ionic conductivity (4 to 10 times greater than methyl carbonate-terminated electrolytes) while maintaining the fire resistance and lithium ion transference properties of the perfluoropolyether backbone.
2Reliability
If perfluoropolyethers terminated with methoxycarbonyl groups are used as lithium ion electrolytes, then fire resistance is improved, but ionic conductivity remains low at about 10^-5 S cm^-1 at 80°C
Solution Approach 1:
The patent changes the terminal functional groups from methoxycarbonyl to urethane groups on the perfluoropolyether chains. This chemical parameter change results in significantly improved ionic conductivity (4 to 10 times greater than methyl carbonate-terminated electrolytes) while maintaining the fire resistance and lithium ion transference properties of the perfluoropolyether backbone.
3Object-affected harmful factors
If traditional methyl carbonate-terminated perfluoropolyether electrolytes are used, then fire resistance is maintained, but ionic conductivity is limited to about 10^-5 S cm^-1 at 80°C
Solution Approach 1:
The patent changes the terminal functional groups from methyl carbonate to urethane groups on the perfluoropolyether chains. This chemical parameter change results in significantly improved ionic conductivity (4 to 10 times greater than methyl carbonate-terminated electrolytes) while maintaining the fire resistance and lithium ion transference properties of the perfluoropolyether backbone.
Solution Approach 2:
The patent creates a composite electrolyte system combining urethane-terminated perfluoropolyether with lithium bis(trifluoromethane)sulfonimide salt. This composite material achieves synergistic effects where the urethane groups enhance ionic conductivity while the perfluoropolyether backbone provides fire resistance and stability.
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 urethane-terminated perfluoropolyether electrolytes demonstrate significantly higher ionic conductivities and improved salt solubility, enabling better performance and safety in lithium-ion batteries, with conductivities 4 to 10 times greater than traditional methyl carbonate-terminated electrolytes.
Implementation Method 1
The electrolyte provides ionic communication between the anode and the cathode
Data Source
AI summary
Perfluoropolyether electrolytes terminated with polar substituents such as dimethylurethanes show enhanced ionic conductivities when formulated with lithium bis(trifluoromethane)sulfonimide, making them useful as electrolytes for lithium cells.