Sodiation in MoS2 was reported to be a reversible and an irreversible conversion process with the structure changing to few layers. Another study reported MoS2 failed to undergo conversion reaction; instead, sodiation caused structural transition forming distorted MoSx clusters, with partial regeneration to MoS2 after desodiation. In the case of K storage, there have been very limited studies, but yet vastly different results were seen. Du et al.