Páez Fajardo, Galo J., Belekoukia, Meltiani, Bolloju, Satish, Fiamegkou, Eleni, Menon, Ashok S., Ruff, Zachary, Shen, Zonghao, Shah, Nickil, Björklund, Erik, Zuba, Mateusz Jan, Lee, Tien-Lin, Thakur, Pardeep K., Weatherup, Robert S., Aguadero, Ainara, Loveridge, Melanie, Grey, Clare P. and Piper, Louis F. J. (2024) Understanding improved capacity retention at 4.3 V in modified single crystal Ni-rich NMC//graphite pouch cells at elevated temperature. RSC Applied Interfaces, 1 (1). pp. 133-146. doi:10.1039/d3lf00093a ISSN 2755-3701.
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Abstract
The capacity retention of commercially-sourced pouch cells with single crystal Al surface-doped Ni-rich cathodes (LiNi0.834Mn0.095Co0.071O2) is examined. The degradation-induced capacity fade becomes more pronounced as the upper-cut-off voltage (UCV) increases from 4.2 V to 4.3 V (vs. graphite) at a fixed cycling temperature (either 25 or 40 °C). However, cycles with 4.3 V UCV (slightly below the oxygen loss onset) show better capacity retention upon increasing the cycling temperature from 25 °C to 40 °C. Namely, after 500 cycles at 4.3 V UCV, cycling temperature at 40 °C retains 85.5% of the initial capacity while cycling at 25 °C shows 75.0% capacity retention. By employing a suite of electrochemical, X-ray spectroscopy and secondary ion mass spectrometry techniques, we attribute the temperature-induced improvement of the capacity retention at high UCV to the combined effects of Al surface-dopants, electrochemically resilient single crystal Ni-rich particles, and thermally-improved Li kinetics translating into better electrochemical performance. If cycling remains below the lattice oxygen loss onset, improved capacity retention in industrial cells should be achieved in single crystal Ni-rich cathodes with the appropriate choice of cycling parameter, particle quality, and particle surface dopants.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QD Chemistry T Technology > TJ Mechanical engineering and machinery T Technology > TK Electrical engineering. Electronics Nuclear engineering |
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) |
| SWORD Depositor: | Library Publications Router |
| Library of Congress Subject Headings (LCSH): | Lithium ion batteries, Lithium ion batteries -- Materials, Cathodes, Energy storage |
| Journal or Publication Title: | RSC Applied Interfaces |
| Publisher: | RSC |
| ISSN: | 2755-3701 |
| Official Date: | 1 January 2024 |
| Dates: | Date Event 1 January 2024 Published 21 September 2023 Available 5 September 2023 Accepted |
| Volume: | 1 |
| Number: | 1 |
| Page Range: | pp. 133-146 |
| DOI: | 10.1039/d3lf00093a |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Open Access (Creative Commons open licence) |
| Date of first compliant deposit: | 22 September 2023 |
| Date of first compliant Open Access: | 25 September 2023 |
| RIOXX Funder/Project Grant: | Project/Grant ID RIOXX Funder Name Funder ID |
| Related URLs: | |
| URI: | https://wrap.warwick.ac.uk/179465/ |
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