On magnesium Mg ions insertion into inorganic hosts

7 On magnesium (Mg) ions insertion into inorganic hosts 

However, during efforts to develop rechargeable Mg batteries in recent years, it was realized that the selection of materials suitable for the Mg ion insertion presents a great challenge. In fact, in spite of the expected similarity between Li and Mg ion intercalation, almost all inorganic compounds, which prove themselves as suitable cathode materials for Li batteries, show very poor electrochemical performance regarding Mg ion insertion. 

74 A comparison of the electrochemical Li and Mg ions insertion into porous V2O5 electrodes. The relevant solution compositions are indicated in the charts. Repeated galvanostatic experiments, voltage profiles are presented. 

15 A schematic presentation of the structure of Mg MosSe Chevrei phases and the typicai voitage profiie of eiectrochemical Mg ions insertion/deinsertion into them in gaivanostatic experiments with THF/Mg(AiCi2BuEt)2 soiutions at 60 °C (fuiiy reversibie Mg ions intercaiation in two consecutive phase transition processes is indicated). 

The discovery of Chevrei phases as interesting hosts for reversible Mg ions intercalation resulted from many unsuccessful experiments of Mg insertion into well-known Li ion hosts, as well as from the literature concerning the possibility of divalent ion intercalation in inorganic materials. This analysis revealed that Chevrei phases are unique materials that allow a relatively fast insertion of divalent cations [62] such as Zn, Cd , Ni, Mn , Co and Fe. In the intercalation processes into Chevrei phases, the six metal Mo ions can be regarded as a single ion that can accommodate up 

---