TY - JOUR
T1 - Autoxidation in amide-based electrolyte and its suppression for enhanced oxygen efficiency and cycle performance in non-aqueous lithium oxygen battery
AU - Kim, Dong Wook
AU - Lee, Dong Hun
AU - Ahn, Su Mi
AU - Kim, Do Youb
AU - Suk, Jungdon
AU - Choi, Dong Hoon
AU - Kang, Yongku
N1 - Funding Information:
This work was financially supported by the Government-Funded General Research & Development Program (SI-1604) of the Ministry of Trade, Industry and Energy, Republic of Korea.
Publisher Copyright:
© 2017 Elsevier B.V.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2017
Y1 - 2017
N2 - In spite of several desirable properties such as high stability against superoxide anion and low vapor pressure, N-methyl-2-pyrrolidone (NMP) electrolyte is reported not suitable for use in lithium-oxygen (Li-O2) batteries because of severe degradation upon cycling and low oxygen efficiency. In this work, we find that NMP electrolyte is reactive with O2gas in the presence of lithium metal and such O2-consuming reaction (i.e., autoxidation) is a possible cause for the poor performance in Li-O2batteries with NMP electrolyte. The autoxidation of NMP is verified by direct measurement of the depletion of O2gas in the hermetically sealed symmetric Li/Li cells via in-situ gas pressure analysis. In-situ differential electrochemical mass spectroscopy (DEMS) experiment reveals that the autoxidation resulted in significant O2consumption upon discharge, very low O2efficiency upon charge, and eventually fast capacity fading. Lithium nitrate (LiNO3), which provides a protective layer on the surface of lithium metal, is employed to suppress the autoxidation, leading to significantly enhanced oxygen efficiency and cycle life.
AB - In spite of several desirable properties such as high stability against superoxide anion and low vapor pressure, N-methyl-2-pyrrolidone (NMP) electrolyte is reported not suitable for use in lithium-oxygen (Li-O2) batteries because of severe degradation upon cycling and low oxygen efficiency. In this work, we find that NMP electrolyte is reactive with O2gas in the presence of lithium metal and such O2-consuming reaction (i.e., autoxidation) is a possible cause for the poor performance in Li-O2batteries with NMP electrolyte. The autoxidation of NMP is verified by direct measurement of the depletion of O2gas in the hermetically sealed symmetric Li/Li cells via in-situ gas pressure analysis. In-situ differential electrochemical mass spectroscopy (DEMS) experiment reveals that the autoxidation resulted in significant O2consumption upon discharge, very low O2efficiency upon charge, and eventually fast capacity fading. Lithium nitrate (LiNO3), which provides a protective layer on the surface of lithium metal, is employed to suppress the autoxidation, leading to significantly enhanced oxygen efficiency and cycle life.
KW - Autoxidation
KW - In-situ gas pressure analysis
KW - Lithium nitrate
KW - Lithium-oxygen battery
KW - N-methyl-2-pyrrolidone
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U2 - 10.1016/j.jpowsour.2017.02.027
DO - 10.1016/j.jpowsour.2017.02.027
M3 - Article
AN - SCOPUS:85013642479
VL - 347
SP - 186
EP - 192
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
ER -
