Enhancement effect of trace H2O on the charge-discharge cycling performance of a Li metal anode

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Abstract

The effects of a small amount of H2O with and without CO 2 in an electrolyte of 1 M LiPF6/ethylene carbonate and diethyl carbonate on the cycling life of a Li metal anode is investigated in this paper using charge-discharge cycling. A low cycling performance, which is less than 55%, is observed with the electrolyte with trace H2O but without CO2; however, when the trace H2O is accompanied by CO2, performance drastically improves and coulombic efficiency reaches a maximum of 88.9%. In the presence of CO2, the cycling performance is found to be strongly affected by the H2O content in the electrolyte, and increases with an increase in H2O content of up to 35 ppm. From an X-ray photoelectron spectroscopy analysis, trace H 2O is found to affect the compounds of the solid electrolyte interphase (SEI) on the lithium surface and produces an Li2CO 3 and LiF layer on the upper part of the SEI, both known to be good passivation layers for preventing side reactions during charge-discharge cycling.

Original languageEnglish
Pages (from-to)23-27
Number of pages5
JournalJournal of Power Sources
Volume261
DOIs
Publication statusPublished - 2014 Sep 1

Fingerprint

Electrolytes
Anodes
anodes
Metals
Solid electrolytes
cycles
augmentation
Carbonates
metals
solid electrolytes
electrolytes
Carbon Monoxide
carbonates
Lithium
Passivation
Ethylene
X ray photoelectron spectroscopy
passivity
ethylene
lithium

Keywords

  • Ambient air
  • CO
  • Dry air
  • Li metal anode
  • Trace HO

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

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title = "Enhancement effect of trace H2O on the charge-discharge cycling performance of a Li metal anode",
abstract = "The effects of a small amount of H2O with and without CO 2 in an electrolyte of 1 M LiPF6/ethylene carbonate and diethyl carbonate on the cycling life of a Li metal anode is investigated in this paper using charge-discharge cycling. A low cycling performance, which is less than 55{\%}, is observed with the electrolyte with trace H2O but without CO2; however, when the trace H2O is accompanied by CO2, performance drastically improves and coulombic efficiency reaches a maximum of 88.9{\%}. In the presence of CO2, the cycling performance is found to be strongly affected by the H2O content in the electrolyte, and increases with an increase in H2O content of up to 35 ppm. From an X-ray photoelectron spectroscopy analysis, trace H 2O is found to affect the compounds of the solid electrolyte interphase (SEI) on the lithium surface and produces an Li2CO 3 and LiF layer on the upper part of the SEI, both known to be good passivation layers for preventing side reactions during charge-discharge cycling.",
keywords = "Ambient air, CO, Dry air, Li metal anode, Trace HO",
author = "Norihiro Togasaki and Toshiyuki Momma and Tetsuya Osaka",
year = "2014",
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T1 - Enhancement effect of trace H2O on the charge-discharge cycling performance of a Li metal anode

AU - Togasaki, Norihiro

AU - Momma, Toshiyuki

AU - Osaka, Tetsuya

PY - 2014/9/1

Y1 - 2014/9/1

N2 - The effects of a small amount of H2O with and without CO 2 in an electrolyte of 1 M LiPF6/ethylene carbonate and diethyl carbonate on the cycling life of a Li metal anode is investigated in this paper using charge-discharge cycling. A low cycling performance, which is less than 55%, is observed with the electrolyte with trace H2O but without CO2; however, when the trace H2O is accompanied by CO2, performance drastically improves and coulombic efficiency reaches a maximum of 88.9%. In the presence of CO2, the cycling performance is found to be strongly affected by the H2O content in the electrolyte, and increases with an increase in H2O content of up to 35 ppm. From an X-ray photoelectron spectroscopy analysis, trace H 2O is found to affect the compounds of the solid electrolyte interphase (SEI) on the lithium surface and produces an Li2CO 3 and LiF layer on the upper part of the SEI, both known to be good passivation layers for preventing side reactions during charge-discharge cycling.

AB - The effects of a small amount of H2O with and without CO 2 in an electrolyte of 1 M LiPF6/ethylene carbonate and diethyl carbonate on the cycling life of a Li metal anode is investigated in this paper using charge-discharge cycling. A low cycling performance, which is less than 55%, is observed with the electrolyte with trace H2O but without CO2; however, when the trace H2O is accompanied by CO2, performance drastically improves and coulombic efficiency reaches a maximum of 88.9%. In the presence of CO2, the cycling performance is found to be strongly affected by the H2O content in the electrolyte, and increases with an increase in H2O content of up to 35 ppm. From an X-ray photoelectron spectroscopy analysis, trace H 2O is found to affect the compounds of the solid electrolyte interphase (SEI) on the lithium surface and produces an Li2CO 3 and LiF layer on the upper part of the SEI, both known to be good passivation layers for preventing side reactions during charge-discharge cycling.

KW - Ambient air

KW - CO

KW - Dry air

KW - Li metal anode

KW - Trace HO

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