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Degradation mechanisms in Li 2 VO 2 F Li-rich disordered rock-salt cathodes

DOI: 10.1021/acs.chemmater.9b00829 DOI Help

Authors: Ida Kallquist (Uppsala University) , Andrew J. Naylor (Uppsala University) , Christian Baur (Helmholtz Institute Ulm) , Johann Chable (Helmholtz Institute Ulm) , Jolla Kullgren (Uppsala University) , Maximilian Fichtner (Helmholtz Institute Ulm; Karlsruhe Institute of Technology) , Kristina Edstrom (Uppsala University) , Daniel Brandell (Uppsala University) , Maria Hahlin (Uppsala University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemistry Of Materials

State: Published (Approved)
Published: June 2019
Diamond Proposal Number(s): 19602

Abstract: The strive for increased energy density in Li-ion batteries is particularly dependent on the cathode materials, that so far have been limiting for the overall battery performance. A new class of materials, Li-rich disordered rock-salts, has recently been brought forward as promising candidates for next-generation cathodes due to their ability to reversibly cycle more than one Li-ion per transition metal. Several variants of these Li-rich cathode materials have been developed recently and show promising initial capacities, but challenges concerning capacity fade and voltage decay during cycling need yet to be overcome. Mechanisms behind the significant capacity fade of some materials must be understood to allow for the design of new materials in which detrimental reactions can be mitigated. In this study the origin of the capacity fade in the Li-rich material Li2VO2F is investigated and it is shown to begin with a degradation of the particle surface that spreads inwards with continued cycling.

Subject Areas: Chemistry, Materials, Energy

Instruments: I09-Surface and Interface Structural Analysis

Other Facilities: BESSY II