Both macro- and microscopic magnetic nature of LixNiO2 (0.1 <= x <= 1) were studied by susceptibility (chi) and muon-spin rotation and relaxation (mu+SR) measurements in order to understand the change in magnetism of LixNiO2 with x. The chi measurements showed the presence of spin-glass-like freezing at T-f similar to 11 K for the samples in the whole x range measured. This implies that the macroscopic magnetism is not sensitive to x, although the crystal structure and average oxidation state of the Ni ions of LixNiO2 alter as a function of x. On the other hand, the microscopic magnetism of LixNiO2 is found to be quite different from the macroscopic one. That is. a static antiferromagnetic ordered phase appears at low T for the samples with 0.6 <= x <= 1, while a spin-glass-like disordered phase presents for the 0.25 <= x <= 0.5 samples below 10 K. (C) 2008 Elsevier B.V. All rights reserved.