Salts for multivalent ion batteries
AssigneeUchicago Argonne, LLC
InventorsChen Liao, Trevor L. Dzwiniel, Baofei Pan, Sang-Don Han, Anthony Burrell
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Abstract
Methods for preparing electrolyte salts for alkaline earth metal-ion batteries (e.g., calcium and magnesium ion batteries) are described. The electrolyte salts comprise alkaline earth metal (e.g., Mg or Ca) salts of bis(fluorosulfonyl)imide (FSI) and 3,4-dicyano-2-trifluoromethylimidazole (TDI). The methods comprise contacting FSI or TDI with an alkaline earth metal bis(trifluoroacetate) salt in trifluoroacetic acid.
Claims10
A method for preparing an alkaline earth metal salt of bis(fluorosulfonyl)imide (FSI) useful as an electrolyte salt for an alkaline earth metal-ion battery, the method comprising:
- contacting FSI with a solution containing at least 0.5 molar equivalents of an alkaline earth metal bis-trifluoroacetate salt of the formula (CF3CO2)2M, dissolved in trifluoroacetic acid to form an FSI salt of formula:
- wherein M is an alkaline earth metal;
- and
- recovering the FSI salt.
Dependencies are inferred from the claim text.