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Oxygen-redox activity in non-lithium-excess tungsten-doped LiNiO2 cathode

DOI: 10.1103/PRXEnergy.2.013005 DOI Help

Authors: A. S. Menon (University of Warwick; The Faraday Institution) , B. J. Johnston (The Faraday Institution; The University of Sheffield) , S. G. Booth (The Faraday Institution; The University of Sheffield; Integrated Graphene Ltd) , L. Zhang (The Faraday Institution; Lancaster University) , K. Kress (The Faraday Institution; The University of Sheffield) , B. E. Murdock (Lancaster University) , G. Paez Fajardo (University of Warwick; The Faraday Institution) , N. N. Anthonisamy (The Faraday Institution; The University of Sheffield; Jaguar Land Rover Inc) , N. Tapia-Ruiz (The Faraday Institution; Lancaster University; Imperial College London) , S. Agrestini (Diamond Light Source) , M. Garcia-Fernandez (Diamond Light Source) , K. Zhou (Diamond Light Source) , P. K. Thakur (Diamond Light Source) , T. L. Lee (Diamond Light Source) , A. J. Nedoma (The Faraday Institution; University of Sheffield) , S. A. Cussen (The Faraday Institution; The University of Sheffield) , L. F. J. Piper (University of Warwick; The Faraday Institution)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Prx Energy , VOL 2

State: Published (Approved)
Published: March 2023
Diamond Proposal Number(s): 29104 , 29113

Open Access Open Access

Abstract: The desire to increase the energy density of stoichiometric layered Li TM O 2 (TM = 3d transition metal) cathode materials has promoted investigation into their properties at high states of charge. Although there is increasing evidence for pronounced oxygen participation in the charge compensation mechanism, questions remain whether this is true O -redox, as observed in Li -excess cathodes. Through a high-resolution O K-edge resonant inelastic x-ray spectroscopy (RIXS) study of the Mn -free Ni -rich layered oxide Li Ni 0.98 W 0.02 O 2 , we demonstrate that the same oxidized oxygen environment exists in both Li -excess and non- Li -excess systems. The observation of identical RIXS loss features in both classes of compounds is remarkable given the differences in their crystallographic structure and delithiation pathways. This lack of a specific structural motif reveals the importance of electron correlation in the charge compensation mechanism for these systems and indicates how a better description of charge compensation in layered oxides is required to understand anionic redox for energy storage.

Journal Keywords: Electrochemical properties; Mixed ionic electronic conduction; Energy applications; Energy materials; X-ray absorption spectroscopy; X-ray diffraction; X-ray emission spectroscopy

Diamond Keywords: Batteries; Lithium-ion

Subject Areas: Materials, Chemistry, Energy

Instruments: I09-Surface and Interface Structural Analysis , I21-Resonant Inelastic X-ray Scattering (RIXS)

Added On: 16/03/2023 10:35


Discipline Tags:

Energy Storage Energy Physical Chemistry Energy Materials Chemistry Materials Science

Technical Tags:

Scattering Spectroscopy Resonant Inelastic X-ray Scattering (RIXS) X-ray Absorption Spectroscopy (XAS)