The effect of Ni-doping on the stability of Li2MnO3 cathode material: a DFT studyM. G. Mphahlele, M. C. Masedi, K. T. Malatji, P. E. Ngoepe and R. S. LedwabaMATEC Web Conf., 388 (2023) 07005DOI: https://doi.org/10.1051/matecconf/202338807005