Presentation Title

Electrochemical Perfomance of Fluorosurfactant Electrolyte Additives in Li-S Batteries and Their Contribution to Solid-Electrolyte Interface Formation

Faculty Mentor

Ram Seshadri

Start Date

18-11-2017 12:30 PM

End Date

18-11-2017 1:30 PM

Location

BSC-Ursa Minor 112

Session

Poster 2

Type of Presentation

Poster

Subject Area

engineering_computer_science

Abstract

As fossil fuels deplete, there is an increasing demand for better energy storage. Conversion batteries undergo a different mechanism than commercial intercalation batteries. The first conversion material discovered, Li-S batteries, theoretically have greater specific energy and specific power compared to commercial Li-ion batteries but they lack the reversibility of commercial batteries due to the parasitic polysulfide shuttle that occurs. Fluorosurfactant electrolyte additives can promote the formation of a protective solid-electrolyte interface (SEI) on the anode, increasing reversibility, as shown in this study. Electrochemical performance of the additives is monitored by short-term galvanostatic cycling for preliminary screening shows the most promising electrolyte additives. The auspicious additives are then compared to the standard using both x-ray photoelectron spectroscopy (XPS) and galvanostatic long-term cycling. Ex-situ XPS shows the formation of the SEI, also compared to the standard. Screening of such electrolyte additives is necessary to fundamentally understand and improve upon the role they play in improving battery technology for next generation energy storage materials.

Summary of research results to be presented

Promising fluorosurfactant additives, polymers tridecafluorooctyl acrylate and tridecafluoroethyl acrylate, were electrochemically screened using short term galvanostatic cycling and compared against the typical standard, lithium nitrate. The leading electrolyte additives underwent ex situ XPS and longer electrochemical cycling to see if they outperformed the standard. Through these techniques it was shown that for the first few cycles the top fluorosurfactant additive outperformed the standard, but upon subsequent cycling this does not hold. This is valuable information for the scientific community at large to continue developing the next generation of energy storage materials.

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Nov 18th, 12:30 PM Nov 18th, 1:30 PM

Electrochemical Perfomance of Fluorosurfactant Electrolyte Additives in Li-S Batteries and Their Contribution to Solid-Electrolyte Interface Formation

BSC-Ursa Minor 112

As fossil fuels deplete, there is an increasing demand for better energy storage. Conversion batteries undergo a different mechanism than commercial intercalation batteries. The first conversion material discovered, Li-S batteries, theoretically have greater specific energy and specific power compared to commercial Li-ion batteries but they lack the reversibility of commercial batteries due to the parasitic polysulfide shuttle that occurs. Fluorosurfactant electrolyte additives can promote the formation of a protective solid-electrolyte interface (SEI) on the anode, increasing reversibility, as shown in this study. Electrochemical performance of the additives is monitored by short-term galvanostatic cycling for preliminary screening shows the most promising electrolyte additives. The auspicious additives are then compared to the standard using both x-ray photoelectron spectroscopy (XPS) and galvanostatic long-term cycling. Ex-situ XPS shows the formation of the SEI, also compared to the standard. Screening of such electrolyte additives is necessary to fundamentally understand and improve upon the role they play in improving battery technology for next generation energy storage materials.