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Title: In situ stress measurements during electrochemical cycling of lithium-rich cathodes

Journal Article · · Journal of Power Sources

Layered lithium transition metal oxides (Li1+xM1-xO2, M= Ni, Mn, Co) are attractive cathode materials for lithium-ion batteries due to their high reversible capacity but suffer from structural changes and voltage fade. In this study, we use stress as a novel way to track irreversible changes in Li1.2Mn0.55Ni0.125Co0.125O2 (LR-NMC) cathodes. A unique and unpredicted stress signature is observed during the first delithiation. Initially, a tensile stress is observed, consistent with volume contraction from lithium removal, however, the stress reverses and becomes compressive with continued charging beyond 4 V vs Li/Li+, indicating volume expansion; this phenomenon is present in the first cycle only. The origin of this irreversible stress during delithiation is likely oxygen loss and the resulting cation rearrangement. Here, Raman spectroscopy provides evidence of the layered-to-spinel phase transition after cycling in the LR-NMC films, as well as recovery of the original spectra upon re-annealing in an oxygen environment.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1407794
Alternate ID(s):
OSTI ID: 1495803
Journal Information:
Journal of Power Sources, Vol. 364, Issue C; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (5)

Advanced Thin Film Cathodes for Lithium Ion Batteries journal February 2020
Degradation and Aging Routes of Ni-Rich Cathode Based Li-Ion Batteries journal January 2020
Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries journal August 2019
Real-time monitoring of stress development during electrochemical cycling of electrode materials for Li-ion batteries: overview and perspectives journal January 2019
Degradation and Aging Routes of Ni-Rich Cathode Based Li-Ion Batteries text January 2020

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