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Title: Operando Spectroscopic Microscopy of LiCoO 2 Cathodes Outside Standard Operating Potentials

LiCoO 2 can experience over-lithiation (over-discharge) in an electrochemical cell due to poor battery management, failure such as a short circuit, or when LiCoO 2 is utilized as a negative electrode conversion material. Furthermore, in order to understand the chemical and morphological changes which occur during over-lithiation, LiCoO 2 electrodes were studied during deep discharge to 0.8 V with operando X-ray absorption spectroscopy and spectroscopic X-ray microscopy. During over-lithiation, micron-sized LiCoO 2 particles suffer significant cracking, pulverization and an incomplete conversion to Co metal. These irreversible morphological and structural changes then inflict permanent damage on the cathode even during a single over-lithiation event and highlight the need for more sophisticated battery management systems.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Electrochimica Acta
Additional Journal Information:
Journal Volume: 247; Journal Issue: C; Journal ID: ISSN 0013-4686
Publisher:
Elsevier
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; transmission x-ray microscopy; x-ray absorption spectroscopy; over-discharge; in-situ; Li-ion
OSTI Identifier:
1394078

Nelson Weker, Johanna, Wise, Anna M., Lim, Kipil, Shyam, Badri, and Toney, Michael F.. Operando Spectroscopic Microscopy of LiCoO 2 Cathodes Outside Standard Operating Potentials. United States: N. p., Web. doi:10.1016/j.electacta.2017.06.173.
Nelson Weker, Johanna, Wise, Anna M., Lim, Kipil, Shyam, Badri, & Toney, Michael F.. Operando Spectroscopic Microscopy of LiCoO 2 Cathodes Outside Standard Operating Potentials. United States. doi:10.1016/j.electacta.2017.06.173.
Nelson Weker, Johanna, Wise, Anna M., Lim, Kipil, Shyam, Badri, and Toney, Michael F.. 2017. "Operando Spectroscopic Microscopy of LiCoO 2 Cathodes Outside Standard Operating Potentials". United States. doi:10.1016/j.electacta.2017.06.173. https://www.osti.gov/servlets/purl/1394078.
@article{osti_1394078,
title = {Operando Spectroscopic Microscopy of LiCoO 2 Cathodes Outside Standard Operating Potentials},
author = {Nelson Weker, Johanna and Wise, Anna M. and Lim, Kipil and Shyam, Badri and Toney, Michael F.},
abstractNote = {LiCoO2 can experience over-lithiation (over-discharge) in an electrochemical cell due to poor battery management, failure such as a short circuit, or when LiCoO2 is utilized as a negative electrode conversion material. Furthermore, in order to understand the chemical and morphological changes which occur during over-lithiation, LiCoO2 electrodes were studied during deep discharge to 0.8 V with operando X-ray absorption spectroscopy and spectroscopic X-ray microscopy. During over-lithiation, micron-sized LiCoO2 particles suffer significant cracking, pulverization and an incomplete conversion to Co metal. These irreversible morphological and structural changes then inflict permanent damage on the cathode even during a single over-lithiation event and highlight the need for more sophisticated battery management systems.},
doi = {10.1016/j.electacta.2017.06.173},
journal = {Electrochimica Acta},
number = C,
volume = 247,
place = {United States},
year = {2017},
month = {7}
}