Probing Sources of Capacity Fade in LiNi0.6Mn0.2Co0.2O 2 (NMC622): An Operando XRD Study of Li/NMC622 Batteries during Extended Cycling
Abstract
LiNi0.6Mn0.2Co0.2O 2 (NMC622) is one of the most promising Li-ion battery cathodes as it delivers high capacity at high potentials. However high potentials also lead to decreases in capacity retention where the disintegration of the secondary particles has been implicated as a major driving force of this capacity fade. This has been attributed to anisotropic lattice changes and increased microstrain during cycling. To probe how these factors affect capacity fade, Li/NMC622 batteries were cycled from 3-4.3 or 4.7 V and probed with operando X-ray diffraction over the 1st, 2nd, and 101st cycles. Further characterization with scanning electron microscopy, and inductively coupled plasmaoptical emission spectroscopy was also performed. The use of operando XRD over many cycles allowed for the collection of detailed structural information in real time over a time frame in which fading can be observed. During the first two cycles, the cells charged to 4.7 V exhibit increased anisotropic lattice changes as compared to the cells charged to 4.3 V. Upon the 101st cycle, when significant fade has been observed, the cells charged to 4.3 and 4.7 V show identical lattice changes to one another, while the 4.7 V charge limit induces more microstrain. This shows that elevated microstrainmore »
- Authors:
-
[2];
[2];
[1];
[3];
[3]
- Stony Brook Univ., NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Center for Mesoscale Transport Properties (m2mt); Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1633606
- Report Number(s):
- BNL-216054-2020-JAAM
Journal ID: ISSN 1932-7447
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 124; Journal Issue: 15; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE
Citation Formats
Quilty, Calvin D., Bock, David C., Yan, Shan, Takeuchi, Kenneth J., Takeuchi, Esther S., and Marschilok, Amy C. Probing Sources of Capacity Fade in LiNi0.6Mn0.2Co0.2O 2 (NMC622): An Operando XRD Study of Li/NMC622 Batteries during Extended Cycling. United States: N. p., 2020.
Web. doi:10.1021/acs.jpcc.0c00262.
Quilty, Calvin D., Bock, David C., Yan, Shan, Takeuchi, Kenneth J., Takeuchi, Esther S., & Marschilok, Amy C. Probing Sources of Capacity Fade in LiNi0.6Mn0.2Co0.2O 2 (NMC622): An Operando XRD Study of Li/NMC622 Batteries during Extended Cycling. United States. https://doi.org/10.1021/acs.jpcc.0c00262
Quilty, Calvin D., Bock, David C., Yan, Shan, Takeuchi, Kenneth J., Takeuchi, Esther S., and Marschilok, Amy C. Sun .
"Probing Sources of Capacity Fade in LiNi0.6Mn0.2Co0.2O 2 (NMC622): An Operando XRD Study of Li/NMC622 Batteries during Extended Cycling". United States. https://doi.org/10.1021/acs.jpcc.0c00262. https://www.osti.gov/servlets/purl/1633606.
@article{osti_1633606,
title = {Probing Sources of Capacity Fade in LiNi0.6Mn0.2Co0.2O 2 (NMC622): An Operando XRD Study of Li/NMC622 Batteries during Extended Cycling},
author = {Quilty, Calvin D. and Bock, David C. and Yan, Shan and Takeuchi, Kenneth J. and Takeuchi, Esther S. and Marschilok, Amy C.},
abstractNote = {LiNi0.6Mn0.2Co0.2O 2 (NMC622) is one of the most promising Li-ion battery cathodes as it delivers high capacity at high potentials. However high potentials also lead to decreases in capacity retention where the disintegration of the secondary particles has been implicated as a major driving force of this capacity fade. This has been attributed to anisotropic lattice changes and increased microstrain during cycling. To probe how these factors affect capacity fade, Li/NMC622 batteries were cycled from 3-4.3 or 4.7 V and probed with operando X-ray diffraction over the 1st, 2nd, and 101st cycles. Further characterization with scanning electron microscopy, and inductively coupled plasmaoptical emission spectroscopy was also performed. The use of operando XRD over many cycles allowed for the collection of detailed structural information in real time over a time frame in which fading can be observed. During the first two cycles, the cells charged to 4.7 V exhibit increased anisotropic lattice changes as compared to the cells charged to 4.3 V. Upon the 101st cycle, when significant fade has been observed, the cells charged to 4.3 and 4.7 V show identical lattice changes to one another, while the 4.7 V charge limit induces more microstrain. This shows that elevated microstrain at high charge limits is a major driver for particle disintegration in NMC622 cathodes. This study provides important insights into the mechanisms of particle disintegration and capacity fade in NMC/Li-ion batteries, which will enable the design of NMC electrodes that deliver both higher capacities and exhibit better capacity retention.},
doi = {10.1021/acs.jpcc.0c00262},
journal = {Journal of Physical Chemistry. C},
number = 15,
volume = 124,
place = {United States},
year = {Sun Mar 22 00:00:00 EDT 2020},
month = {Sun Mar 22 00:00:00 EDT 2020}
}
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