4. LIQUEFIED GAS SOLVENT BASED ELECTROLYTE FOR ELECTROCHEMICAL ENERGY STORAGE DEVICE

Department: NanoEngineering
Research Institute Affiliation: Agile - Sustainable Power and Energy Center (SPEC)
Faculty Advisor(s): Ying Meng

Primary Student
Name: Yangyuchen Yang
Email: yay081@ucsd.edu
Phone: 858-822-4247
Grad Year: 2020

Student Collaborators
Cyrus Rustomji, crustomji@ucsd.edu

Abstract
Using electrolytes based on Liquefied Gas Solvents, high performance of both Li-Ion Batteries and Electrochemical Capacitors at temperatures as low as -60 C has been demonstrated for the first time. Current Li‑Ion technology necessitates the use of particular electrolyte solvents which are highly viscous and have relatively low electrolytic conductivity, preventing high performance below -20 C. Further, Electrochemical Capacitors commonly use a toxic electrolyte for operation down to ‑40 C. Using mild pressures to turn solvents which are typically gaseous at room temperature into a liquid phase, electrolytes with low melting points, low viscosities and moderate dielectric constants have been realized. A number of various solvent and salt systems have been characterized, some showing exceptionally high electrolytic conductivity over a very broad temperature range for both Li-Ion and Electrochemical Capacitor devices. Novel mechanisms for the superior ionic conductivity in these solvents have been studied. Further, these solvents show a wide potential window of stability which may enable high voltage devices. We gratefully acknowledge funding for this project from ARPA-e grant no. DE-AR00000646.

Industry Application Area(s)
Energy/Clean technology | Materials

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