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Sample dependence of magnetism in the next-generation cathode material LiNi0.8Nn0.1Co0.1O2

DOI: 10.1021/acs.inorgchem.0c02899 DOI Help

Authors: Paromita Mukherjee (University of Cambridge; The Faraday Institution) , Joseph A. M. Paddison (University of Cambridge; Oak Ridge National Laboratory) , Chao Xu (University of Cambridge; The Faraday Institution) , Zachary Ruff (University of Cambridge; The Faraday Institution) , Andrew R. Wildes (Institut Laue-Langevin) , David A. Keen (ISIS Neutron and Muon Source) , Ronald I. Smith (ISIS Neutron and Muon Source) , Clare P. Grey (University of Cambridge; The Faraday Institution) , Sian E. Dutton (Cavendish Laboratory, University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Inorganic Chemistry

State: Published (Approved)
Published: December 2020
Diamond Proposal Number(s): 25186

Abstract: We present a structural and magnetic study of two batches of polycrystalline LiNi0.8Mn0.1Co0.1O2 (commonly known as Li NMC 811), a Ni-rich Li ion battery cathode material, using elemental analysis, X-ray and neutron diffraction, magnetometry, and polarized neutron scattering measurements. We find that the samples, labeled S1 and S2, have the composition Li1–xNi0.9+x–yMnyCo0.1O2, with x = 0.025(2), y = 0.120(2) for S1 and x = 0.002(2), y = 0.094(2) for S2, corresponding to different concentrations of magnetic ions and excess Ni2+ in the Li+ layers. Both samples show a peak in the zero-field-cooled (ZFC) dc susceptibility at 8.0(2) K, but the temperature at which the ZFC and FC (field-cooled) curves deviate is substantially different: 64(2) K for S1 and 122(2) K for S2. The ac susceptibility measurements show that the transition for S1 shifts with frequency whereas no such shift is observed for S2 within the resolution of our measurements. Our results demonstrate the sample dependence of magnetic properties in Li NMC 811, consistent with previous reports on the parent material LiNiO2. We further establish that a combination of experimental techniques is necessary to accurately determine the chemical composition of next-generation battery materials with multiple cations.

Subject Areas: Chemistry, Materials

Instruments: I11-High Resolution Powder Diffraction

Other Facilities: ISIS; Institut Laue-Langevin