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MgH2 electrochemical conversion reaction is a valuable alternative to Li intercalation into graphite for next generation Li-ion cells [1].MgH2 has a theoretical capacity of 2048 mAhg-1,5 times larger than of graphite.The incorporation of lithium occurs by the reduction of magnesium hydride to magnesium metal nanoparticles surrounded by an amorphous matrix of lithium hydride [1,2] (hydride conversion reaction, HCR).