TY - JOUR
T1 - Realization of Stable Cathode-Electrolyte Interfaces in DMSO Based Li-O2 Batteries
T2 - Experimental and Theoretical Perspectives
AU - Noked, Malachi
AU - Schroeder, Marshall A
AU - Kumar, Nitin
AU - Pearse, Alexander J
AU - Leung, Kevin
AU - Lee, Sang Bok
AU - Rubloff, Gary W
N1 - © 2016 ECS - The Electrochemical Society
PY - 2016
Y1 - 2016
N2 - One of the primary challenges impeding realization of the non-aqueous Li-O2 battery is finding a solvent that is chemically and electrochemically stable under cell operating conditions. Dimethyl sulfoxide (DMSO) is an attractive candidate for rechargeable Li-O 2 battery studies; however, there is still significant controversy regarding its stability on the Li-O 2 cathode surface. We report here results from a model cathode system featuring various atomic layer deposited (ALD) catalysts including Ru, RuO 2 , and Pt on a mesoporous CNT sponge to study the OER/ORR behavior in DMSO-based Li-O 2 cells. We performed multiple experiments (in-situ XPS, FTIR, Raman, and XRD) which assess the stability of the DMSO-Li 2 O 2 interface and report perspectives on previously published studies. Our electrochemical experiments demonstrate long term, stable cycling of DMSO-based Li-O 2 cells. This work is complemented by density functional theory calculations of DMSO degradation pathways on Li 2 O 2 . Both experimental and theoretical evidence strongly suggest that oxidation of DMSO on the surface of Li 2 O 2 is very unlikely to spontaneously occur and will take place only under certain conditions and to a minor extent under controlled operating voltages and in cell environments free of acidic function groups (either in the electrolyte or porous scaffold). Figure 1
AB - One of the primary challenges impeding realization of the non-aqueous Li-O2 battery is finding a solvent that is chemically and electrochemically stable under cell operating conditions. Dimethyl sulfoxide (DMSO) is an attractive candidate for rechargeable Li-O 2 battery studies; however, there is still significant controversy regarding its stability on the Li-O 2 cathode surface. We report here results from a model cathode system featuring various atomic layer deposited (ALD) catalysts including Ru, RuO 2 , and Pt on a mesoporous CNT sponge to study the OER/ORR behavior in DMSO-based Li-O 2 cells. We performed multiple experiments (in-situ XPS, FTIR, Raman, and XRD) which assess the stability of the DMSO-Li 2 O 2 interface and report perspectives on previously published studies. Our electrochemical experiments demonstrate long term, stable cycling of DMSO-based Li-O 2 cells. This work is complemented by density functional theory calculations of DMSO degradation pathways on Li 2 O 2 . Both experimental and theoretical evidence strongly suggest that oxidation of DMSO on the surface of Li 2 O 2 is very unlikely to spontaneously occur and will take place only under certain conditions and to a minor extent under controlled operating voltages and in cell environments free of acidic function groups (either in the electrolyte or porous scaffold). Figure 1
UR - https://www.mendeley.com/catalogue/f9e79c4c-c2a9-30ab-959b-32c3e76317b8/
U2 - 10.1149/ma2016-03/2/758
DO - 10.1149/ma2016-03/2/758
M3 - Meeting Abstract
SN - 2151-2043
VL - MA2016-03
SP - 758
EP - 758
JO - ECS Meeting Abstracts
JF - ECS Meeting Abstracts
IS - P1
M1 - 758
ER -