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Title: Evolution of the Electrode–Electrolyte Interface of LiNi0.8Co0.15Al0.05O2 Electrodes Due to Electrochemical and Thermal Stress

Abstract

For layered oxide cathodes, impedance growth and capacity fade related to reactions at the cathode–electrolyte interface (CEI) are particularly prevalent at high voltage and high temperatures. At a minimum, the CEI layer consists of Li2CO3, LiF, reduced (relative to the bulk) metal-ion species, and salt decomposition species, but conflicting reports exist regarding their progression during (dis)charging. Utilizing transport measurements in combination with X-ray and nuclear magnetic resonance spectroscopy techniques in our work, we study the evolution of these CEI species as a function of electrochemical and thermal stress for LiNi0.8Co0.15Al0.05O2 (NCA) particle electrodes using a LiPF6 ethylene carbonate:dimethyl carbonate (1:1 volume ratio) electrolyte. Although initial surface metal reduction does correlate with surface Li2CO3 and LiF, these species are found to decompose upon charging and are absent above 4.25 V. While there is trace LiPF6 breakdown at room temperature above 4.25 V, thermal aggravation is found to strongly promote salt breakdown and contributes to surface degradation even at lower voltages (4.1 V). An interesting finding of our work was the partial reformation of LiF upon discharge, which warrants further consideration for understanding CEI stability during cycling.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2];  [2];  [2]; ORCiD logo [3];  [1];  [4];  [5]; ORCiD logo [6]; ORCiD logo [3];  [2]; ORCiD logo [1]
  1. Binghamton Univ., NY (United States)
  2. Rutgers Univ., New Brunswick, NJ (United States)
  3. Univ. of Cambridge (United Kingdom)
  4. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.; Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  5. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Northeastern Center for Chemical Energy Storage (NECCES); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
OSTI Identifier:
1470192
Grant/Contract Number:  
SC0001294; SC0012583; AC02-05CH11231; SI12764; SI16005
Resource Type:
Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 30; Journal Issue: 3; Related Information: NECCES partners with Stony Brook University (lead); Argonne National Laboratory; Binghamton University; Brookhaven National University; University of California, San Diego; University of Cambridge, UK; Lawrence Berkeley National Laboratory; Massachusetts Institute of Technology; University of Michigan; Rutgers University; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; energy storage (including batteries and capacitors); defects; charge transport; materials and chemistry by design; synthesis (novel materials)

Citation Formats

Lebens-Higgins, Zachary W., Sallis, Shawn, Faenza, Nicholas V., Badway, Fadwa, Pereira, Nathalie, Halat, David M., Wahila, Matthew, Schlueter, Christoph, Lee, Tien-Lin, Yang, Wanli, Grey, Clare P., Amatucci, Glenn G., and Piper, Louis F. J. Evolution of the Electrode–Electrolyte Interface of LiNi0.8Co0.15Al0.05O2 Electrodes Due to Electrochemical and Thermal Stress. United States: N. p., 2018. Web. doi:10.1021/acs.chemmater.7b04782.
Lebens-Higgins, Zachary W., Sallis, Shawn, Faenza, Nicholas V., Badway, Fadwa, Pereira, Nathalie, Halat, David M., Wahila, Matthew, Schlueter, Christoph, Lee, Tien-Lin, Yang, Wanli, Grey, Clare P., Amatucci, Glenn G., & Piper, Louis F. J. Evolution of the Electrode–Electrolyte Interface of LiNi0.8Co0.15Al0.05O2 Electrodes Due to Electrochemical and Thermal Stress. United States. https://doi.org/10.1021/acs.chemmater.7b04782
Lebens-Higgins, Zachary W., Sallis, Shawn, Faenza, Nicholas V., Badway, Fadwa, Pereira, Nathalie, Halat, David M., Wahila, Matthew, Schlueter, Christoph, Lee, Tien-Lin, Yang, Wanli, Grey, Clare P., Amatucci, Glenn G., and Piper, Louis F. J. Wed . "Evolution of the Electrode–Electrolyte Interface of LiNi0.8Co0.15Al0.05O2 Electrodes Due to Electrochemical and Thermal Stress". United States. https://doi.org/10.1021/acs.chemmater.7b04782. https://www.osti.gov/servlets/purl/1470192.
@article{osti_1470192,
title = {Evolution of the Electrode–Electrolyte Interface of LiNi0.8Co0.15Al0.05O2 Electrodes Due to Electrochemical and Thermal Stress},
author = {Lebens-Higgins, Zachary W. and Sallis, Shawn and Faenza, Nicholas V. and Badway, Fadwa and Pereira, Nathalie and Halat, David M. and Wahila, Matthew and Schlueter, Christoph and Lee, Tien-Lin and Yang, Wanli and Grey, Clare P. and Amatucci, Glenn G. and Piper, Louis F. J.},
abstractNote = {For layered oxide cathodes, impedance growth and capacity fade related to reactions at the cathode–electrolyte interface (CEI) are particularly prevalent at high voltage and high temperatures. At a minimum, the CEI layer consists of Li2CO3, LiF, reduced (relative to the bulk) metal-ion species, and salt decomposition species, but conflicting reports exist regarding their progression during (dis)charging. Utilizing transport measurements in combination with X-ray and nuclear magnetic resonance spectroscopy techniques in our work, we study the evolution of these CEI species as a function of electrochemical and thermal stress for LiNi0.8Co0.15Al0.05O2 (NCA) particle electrodes using a LiPF6 ethylene carbonate:dimethyl carbonate (1:1 volume ratio) electrolyte. Although initial surface metal reduction does correlate with surface Li2CO3 and LiF, these species are found to decompose upon charging and are absent above 4.25 V. While there is trace LiPF6 breakdown at room temperature above 4.25 V, thermal aggravation is found to strongly promote salt breakdown and contributes to surface degradation even at lower voltages (4.1 V). An interesting finding of our work was the partial reformation of LiF upon discharge, which warrants further consideration for understanding CEI stability during cycling.},
doi = {10.1021/acs.chemmater.7b04782},
journal = {Chemistry of Materials},
number = 3,
volume = 30,
place = {United States},
year = {Wed Jan 10 00:00:00 EST 2018},
month = {Wed Jan 10 00:00:00 EST 2018}
}

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