Electrochemical storage mechanism of alkali-ions in MoS2 is strongly affected by the thermodynamic formation energy and polarity of alkali-metal-sulfur bond. This could result in different mechanisms between K storage and Li/Na storage in MoS2 because K-S bond has a lower formation energy and less polar nature than Li-S and Na-S bonds. Even comparing Li and Na storage in MoS2, the mechanisms reported in literature varied from study to study and diverse conclusions were drawn. It has been reported that MoS2 was regenerated after delithiation, accompanied by the structural transition from bulk to nanostructures. However, the regeneration was not observed in other studies, instead partially reversible conversion reaction back to MoS2 and even irreversible conversion reaction were observed in Li.