Comparative Magnetic Study of Electrochemically and Chemically Delithiated LixMn2O4 and LixNiO2

Abstract The magnetic nature of almost fully delithiated LixMn2O4 and LixNiO2 samples, which were prepared by both an electrochemical (EC-) and chemical (C-) reaction, has been investigated by dc-susceptibility measurements. The Curie–Weiss parameters for C-Li0.07Mn2O4 are almost identical to those for EC-Li0.03Mn2O4. On the contrary, the effective magnetic moment for C-Li0.01NiO2 (1.43 μB) is roughly twice that for EC-Li0.05NiO2 (0.71 μB), suggesting that the Ni valence is not simply determined by the Li/Ni ratio for C-Li0.01NiO2.