Existence of H+ ions in the chemically delithiated LixNiO2 sample proved by structural, magnetic, and thermal analyses

Abstract

Structural and magnetic properties of both electrochemically (EC-) and chemically (C-) delithiated LixNiO2 samples have been studied by powder X-ray diffraction, magnetic susceptibility (\chi), and muon-spin rotation and relaxation (\muSR) measurements. Zero-field \muSR spectra for the C-Li0.01NiO2 sample exhibit a large relaxation compared with these for EC-Li0.1NiO2, indicating the presence of H+ ions in the C-Li0.01NiO2 lattice. Based on the effective magnetic moment of the Ni ions, the composition of the C-Li0.01NiO2 sample is estimated to be H~0.5Li0.01NiO2.