Lithium (Li) ion batteries is the most common battery technology but lately also sodium (Na) batteries are being considered. One reason is that the Li-reserves are limited and if with increasing use of electric vehicles, we might have to reconsider the Li-ion technology. From a material point of view, Na is heavier than Li, hence, Na-ion batteries are assumed to be bulkier and more suitable for stationary applications e.g. energy storage from solar panels and wind turbines. However, Na has also many advantages over Li. Na is e.g. one of the most abundant elements in nature (earth’s crust + the oceans), which makes them ~10 times cheaper than Li. Further, Na-batteries are also though to be better from a safety and environment/health point of view. In this research project we will study a series of new Na-ion battery materials that initially have shown very promising performance.