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Title: Electrochemical Reaction Mechanism of the MoS 2 Electrode in a Lithium-Ion Cell Revealed by in Situ and Operando X-ray Absorption Spectroscopy

Abstract

As a typical transition metal dichalcogenide, MoS2 offers numerous advantages for nanoelectronics and electrochemical energy storage due to its unique layered structure and tunable electronic properties. When used as the anode in lithium-ion cells, MoS2 undergoes intercalation and conversion reactions in sequence upon lithiation, and the reversibility of the conversion reaction is an important but still controversial topic. Here, we clarify unambiguously that the conversion reaction of MoS2 is not reversible, and the formed Li2S is converted to sulfur in the first charge process. Li2S/sulfur becomes the main redox couple in the subsequent cycles and the main contributor to the reversible capacity. In addition, due to the insulating nature of both Li2S and sulfur, a strong relaxation effect is observed during the cycling process. This study clearly reveals the electrochemical lithiation–delithiation mechanism of MoS2, which can facilitate further developments of high-performance MoS2-based electrodes.

Authors:
ORCiD logo [1];  [2];  [3];  [1];  [1];  [3]; ORCiD logo [4]; ORCiD logo [5]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Storage and Distributed Resources Div.
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Div.
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Storage and Distributed Resources Div.; University of California, Berkeley, CA (United States). Department of Chemical and Biomolecular Engineering
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); University of California, Santa Cruz, CA (United States). Department of Chemistry and Biochemistry
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1484751
DOE Contract Number:  
AC02- 05CH11231
Resource Type:
Journal Article
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 18; Journal Issue: 2; Journal ID: ISSN 1530-6984
Country of Publication:
United States
Language:
English

Citation Formats

Zhang, Liang, Sun, Dan, Kang, Jun, Feng, Jun, Bechtel, Hans A., Wang, Lin-Wang, Cairns, Elton J., and Guo, Jinghua. Electrochemical Reaction Mechanism of the MoS 2 Electrode in a Lithium-Ion Cell Revealed by in Situ and Operando X-ray Absorption Spectroscopy. United States: N. p., 2018. Web. doi:10.1021/acs.nanolett.7b05246.
Zhang, Liang, Sun, Dan, Kang, Jun, Feng, Jun, Bechtel, Hans A., Wang, Lin-Wang, Cairns, Elton J., & Guo, Jinghua. Electrochemical Reaction Mechanism of the MoS 2 Electrode in a Lithium-Ion Cell Revealed by in Situ and Operando X-ray Absorption Spectroscopy. United States. doi:10.1021/acs.nanolett.7b05246.
Zhang, Liang, Sun, Dan, Kang, Jun, Feng, Jun, Bechtel, Hans A., Wang, Lin-Wang, Cairns, Elton J., and Guo, Jinghua. Mon . "Electrochemical Reaction Mechanism of the MoS 2 Electrode in a Lithium-Ion Cell Revealed by in Situ and Operando X-ray Absorption Spectroscopy". United States. doi:10.1021/acs.nanolett.7b05246.
@article{osti_1484751,
title = {Electrochemical Reaction Mechanism of the MoS 2 Electrode in a Lithium-Ion Cell Revealed by in Situ and Operando X-ray Absorption Spectroscopy},
author = {Zhang, Liang and Sun, Dan and Kang, Jun and Feng, Jun and Bechtel, Hans A. and Wang, Lin-Wang and Cairns, Elton J. and Guo, Jinghua},
abstractNote = {As a typical transition metal dichalcogenide, MoS2 offers numerous advantages for nanoelectronics and electrochemical energy storage due to its unique layered structure and tunable electronic properties. When used as the anode in lithium-ion cells, MoS2 undergoes intercalation and conversion reactions in sequence upon lithiation, and the reversibility of the conversion reaction is an important but still controversial topic. Here, we clarify unambiguously that the conversion reaction of MoS2 is not reversible, and the formed Li2S is converted to sulfur in the first charge process. Li2S/sulfur becomes the main redox couple in the subsequent cycles and the main contributor to the reversible capacity. In addition, due to the insulating nature of both Li2S and sulfur, a strong relaxation effect is observed during the cycling process. This study clearly reveals the electrochemical lithiation–delithiation mechanism of MoS2, which can facilitate further developments of high-performance MoS2-based electrodes.},
doi = {10.1021/acs.nanolett.7b05246},
journal = {Nano Letters},
issn = {1530-6984},
number = 2,
volume = 18,
place = {United States},
year = {2018},
month = {1}
}