When cycling anode-free sodium batteries, unbalanced volumetric changes in opposite electrodes arise. This problem leads to volumetric changes in the whole battery. While charging the negative electrode, the volume increase corresponds to 0.88 cm3 /A·h. The current study evaluates the volume decrease while charging the positive electrodes which are based on sodium vanadophosphate, sodium fluorovanadophosphate, sodium hexacyanoferrate, and sodiated iron sulfide Na1.5FeS2.
