Synthesis and structural characterization of the normal spinel Li[Ni2]O4

Room-temperature electrochemical extraction of lithium from nearly stoichiometric, layered LiNiO2 gives the solid-solution system Li1−xNiO2. Monitoring the temperature dependence of the X-ray-diffraction pattern of Li0.5NiO2 has revealed a first-order transformation above 150°C to the cubic, normal spinel phase Li[Ni2]O4. This spinel phase is stable to 300°C