aalto1 untyped-item.component.html
Structural and interfacial stability of a coated Ni-rich layered oxide cathode at high-voltage operation
Loading...
Access rights
openAccess
CC BY
CC BY
Creative Commons license
Except where otherwised noted, this item's license is described as openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.
Date
Major/Subject
Mcode
Degree programme
Language
en
Pages
12
Series
Materials Today Energy, Volume 50
Abstract
By increasing the cutoff potential of Ni-rich layered oxide cathodes, specifically LiNi0.8Co0.1Mn0.1O2 (NMC811), Li-ion batteries (LIBs) can deliver higher energy densities; a desirable performance trait in electric vehicle battery systems. However, this strategy compromises the structural and interfacial stability of NMC811, leading to a shorter operational lifetime. In this work, LixWyOz (LWO) coating is formed on the surface of a NMC811 active material to address the instability issues. LWO-NMC811 reports an improved cycling stability compared with an uncoated NMC811 at a high-voltage operation of 3.0–4.6 V. Operando X-ray diffraction and operando dilatometry are combined with ex-situ characterization techniques to elucidate the degradation mechanisms that occur in the cathode material from initial cycling to after 100 charge-discharge cycles. The multiscale analyses show that LWO-NMC811 experiences a suppressed H2→H3 contraction at the high state-of-charge, which results in lesser particle cracking and electrode thickness change. The LWO coating also diminishes the parasitic side reactions and supports the agile movement of Li+ at the electrode-electrolyte interface. Overall, this work demonstrates an inter-mapping of the complex deterioration processes that occur during high-voltage cycling of Ni-rich NMC, which is useful in optimizing electrode design to achieve high performance LIBs.
Description
Publisher Copyright: © 2025 The Authors
Other note
Citation
Llanos, P S, Ahaliabadeh, Z, Miikkulainen, V, Kong, X, Obrezkov, F, Lahtinen, J, Yao, L, Jiang, H, Lassi, U & Kallio, T 2025, 'Structural and interfacial stability of a coated Ni-rich layered oxide cathode at high-voltage operation', Materials Today Energy, vol. 50, 101862. https://doi.org/10.1016/j.mtener.2025.101862