The influence of electrochemical cycling protocols on capacity loss in nickel-rich lithium-ion batteries.

Autor: Dose WM; Department of Engineering, University of Cambridge 17 Charles Babbage Road Cambridge CB3 0FS UK mfld2@cam.ac.uk.; Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK cpg27@cam.ac.uk.; The Faraday Institution, Quad One, Harwell Science and Innovation Campus Didcot OX11 0RA UK., Morzy JK; Department of Engineering, University of Cambridge 17 Charles Babbage Road Cambridge CB3 0FS UK mfld2@cam.ac.uk.; Department of Materials Science and Metallurgy, University of Cambridge 27 Charles Babbage Road Cambridge CB3 0FS UK.; The Faraday Institution, Quad One, Harwell Science and Innovation Campus Didcot OX11 0RA UK., Mahadevegowda A; Department of Materials Science and Metallurgy, University of Cambridge 27 Charles Babbage Road Cambridge CB3 0FS UK.; The Faraday Institution, Quad One, Harwell Science and Innovation Campus Didcot OX11 0RA UK., Ducati C; Department of Materials Science and Metallurgy, University of Cambridge 27 Charles Babbage Road Cambridge CB3 0FS UK.; The Faraday Institution, Quad One, Harwell Science and Innovation Campus Didcot OX11 0RA UK., Grey CP; Department of Chemistry, University of Cambridge Lensfield Road Cambridge CB2 1EW UK cpg27@cam.ac.uk.; The Faraday Institution, Quad One, Harwell Science and Innovation Campus Didcot OX11 0RA UK., De Volder MFL; Department of Engineering, University of Cambridge 17 Charles Babbage Road Cambridge CB3 0FS UK mfld2@cam.ac.uk.; The Faraday Institution, Quad One, Harwell Science and Innovation Campus Didcot OX11 0RA UK.
Jazyk: angličtina
Zdroj: Journal of materials chemistry. A [J Mater Chem A Mater] 2021 Oct 11; Vol. 9 (41), pp. 23582-23596. Date of Electronic Publication: 2021 Oct 11 (Print Publication: 2021).
DOI: 10.1039/d1ta06324c
Abstrakt: The transition towards electric vehicles and more sustainable transportation is dependent on lithium-ion battery (LIB) performance. Ni-rich layered transition metal oxides, such as NMC811 (LiNi 0.8 Mn 0.1 Co 0.1 O 2 ), are promising cathode candidates for LIBs due to their higher specific capacity and lower cost compared with lower Ni content materials. However, complex degradation mechanisms inhibit their use. In this work, tailored aging protocols are employed to decouple the effect of electrochemical stimuli on the degradation mechanisms in graphite/NMC811 full cells. Using these protocols, impedance measurements, and differential voltage analysis, the primary drivers for capacity fade and impedance rise are shown to be large state of charge changes combined with high upper cut-off voltage. Focused ion beam-scanning electron microscopy highlights that extensive microscale NMC particle cracking, caused by electrode manufacturing and calendering, is present prior to aging and not immediately detrimental to the gravimetric capacity and impedance. Scanning transmission electron microscopy electron energy loss spectroscopy reveals a correlation between impedance rise and the level of transition metal reduction at the surfaces of aged NMC811. The present study provides insight into the leading causes for LIB performance fading, and highlights the defining role played by the evolving properties of the cathode particle surface layer.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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