Novel cathode materials for rechargeable batteries have been under intense investigation since high cost and toxicity of current Li-ion batteries. We propose to study the structural properties of NaxLiyNi0.25Mn0.75Od which are very promising candidate for Na-ion batteries due to their electroactivity, stable capacity, ambient temperature operation capability and wide availability of Na. Therefore, we will be able to understand the fundamental microscopic mechanisms underlying the operation of Na-ion batteries which will enable us to improve the materials design.