title: Ionic Liquid-Organic Carbonate Electrolyte Blends To Stabilize Silicon Electrodes for Extending Lithium Ion Battery Operability to 100 °C.
abstract: Fabrication of lithium-ion batteries that operate from room temperature to elevated temperatures entails development and subsequent identification of electrolytes and electrodes. Room temperature ionic liquids (RTILs) can address the thermal stability issues, but their poor ionic conductivity at room temperature and compatibility with traditional graphite anodes limit their practical application. To address these challenges, we evaluated novel high energy density three-dimensional nano-silicon electrodes paired with 1-methyl-1-propylpiperidinium bis(trifluoromethanesulfonyl)imide (Pip) ionic liquid/propylene carbonate (PC)/LiTFSI electrolytes. We observed that addition of PC had no detrimental effects on the thermal stability and flammability of the reported electrolytes, while largely improving the transport properties at lower temperatures. Detailed investigation of the electrochemical properties of silicon half-cells as a function of PC content, temperature, and current rates reveal that capacity increases with PC content and temperature and decreases with increased current rates. For example, addition of 20% PC led to a drastic improvement in capacity as observed for the Si electrodes at 25 °C, with stability over 100 charge/discharge cycles. At 100 °C, the capacity further increases by 3-4 times to 0.52 mA h cm(-2) (2230 mA h g(-1)) with minimal loss during cycling.
authors.affiliation: Department of Mechanical Engineering, Wayne State University , Detroit, Michigan 48202, United States.
authors.forename: Khalid
authors.initials: K
authors.lastname: Ababtain
authors.affiliation: Department of Mechanical Engineering, Wayne State University , Detroit, Michigan 48202, United States.
authors.forename: Ganguli
authors.initials: G
authors.lastname: Babu
authors.affiliation: Department of Biomedical Engineering and Chemistry, Boston University , Boston, Massachusetts 02115, United States.
authors.forename: Xinrong
authors.initials: X
authors.lastname: Lin
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.
authors.forename: Marco-Tulio F
authors.initials: MT
authors.lastname: Rodrigues
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.
authors.forename: Hemtej
authors.initials: H
authors.lastname: Gullapalli
authors.affiliation: Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.
authors.forename: Pulickel M
authors.initials: PM
authors.lastname: Ajayan
authors.affiliation: Department of Biomedical Engineering and Chemistry, Boston University , Boston, Massachusetts 02115, United States.
authors.forename: Mark W
authors.initials: MW
authors.lastname: Grinstaff
authors.affiliation: Department of Mechanical Engineering, Wayne State University , Detroit, Michigan 48202, United States.
authors.forename: Leela Mohana Reddy
authors.initials: LM
authors.lastname: Arava
keywords: additive; high temperature Li-ion batteries; ionic liquid electrolytes; silicon electrodes; solid−electrolyte interface