Energy storage devices having anodes containing Mg and electrolytes utilized therein

摘要

For a metal anode in a battery, the capacity fade is a significant consideration. In energy storage devices having an anode that includes Mg, the cycling stability can be improved by an electrolyte having a first salt, a second salt, and an organic solvent. Examples of the organic solvent include diglyme, triglyme, tetraglyme, or a combination thereof. The first salt can have a magnesium cation and be substantially soluble in the organic solvent. The second salt can enhance the solubility of the first salt and can have a magnesium cation or a lithium cation. The first salt, the second salt, or both have a BH4 anion.

主权项

1. An energy storage device comprising an anode comprising Mg and an electrolyte solution, the electrolyte solution comprising:
an organic solvent selected from the group consisting of diglyme, triglyme, tetraglyme, and combinations thereof; a first salt substantially dissolved in the organic solvent and comprising a magnesium cation; and a second salt substantially dissolved in the organic solvent and comprising a magnesium cation or a lithium cation; wherein one of the first salt or the second salt comprises a BH4 anion and the other of the first salt or the second salt comprises a bis(trifluoromethanesulfonyl)imide (TFSI) anion.