Onset Potential for Electrolyte Oxidation and Ni-Rich Cathode Degradation in Lithium-Ion Batteries.

Autor: Dose WM; Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW Cambridge, U.K.; Department of Engineering, University of Cambridge, 17 Charles Babbage Road, CB3 0FS Cambridge, U.K.; The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot OX11 0RA, U.K., Li W; The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot OX11 0RA, U.K.; Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool, Liverpool L69 3GH, U.K., Temprano I; Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW Cambridge, U.K., O'Keefe CA; Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW Cambridge, U.K.; The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot OX11 0RA, U.K., Mehdi BL; The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot OX11 0RA, U.K.; Department of Mechanical, Materials and Aerospace Engineering, University of Liverpool, Liverpool L69 3GH, U.K., De Volder MFL; Department of Engineering, University of Cambridge, 17 Charles Babbage Road, CB3 0FS Cambridge, U.K.; The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot OX11 0RA, U.K., Grey CP; Department of Chemistry, University of Cambridge, Lensfield Road, CB2 1EW Cambridge, U.K.; The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot OX11 0RA, U.K.
Jazyk: angličtina
Zdroj: ACS energy letters [ACS Energy Lett] 2022 Oct 14; Vol. 7 (10), pp. 3524-3530. Date of Electronic Publication: 2022 Sep 22.
DOI: 10.1021/acsenergylett.2c01722
Abstrakt: High-capacity Ni-rich layered metal oxide cathodes are highly desirable to increase the energy density of lithium-ion batteries. However, these materials suffer from poor cycling performance, which is exacerbated by increased cell voltage. We demonstrate here the detrimental effect of ethylene carbonate (EC), a core component in conventional electrolytes, when NMC811 (LiNi 0.8 Mn 0.1 Co 0.1 O 2 ) is charged above 4.4 V vs Li/Li + -the onset potential for lattice oxygen release. Oxygen loss is enhanced by EC-containing electrolytes-compared to EC-free-and correlates with more electrolyte oxidation/breakdown and cathode surface degradation, which increase concurrently above 4.4 V. In contrast, NMC111 (LiNi 0.33 Mn 0.33 Co 0.33 O 2 ), which does not release oxygen up to 4.6 V, shows a similar extent of degradation irrespective of the electrolyte. This work highlights the incompatibility between conventional EC-based electrolytes and Ni-rich cathodes (more generally, cathodes that release lattice oxygen such as Li-/Mn-rich and disordered rocksalt cathodes) and motivates further work on wider classes of electrolytes and additives.
Competing Interests: The authors declare no competing financial interest.
(© 2022 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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