This application uses a straightforward carbonate eluent to screen for contaminants and forced degradation products in a lithium bis(fluorosulfonyl)imide (LiFSI) electrolyte. The screening procedure did not include any sample preparation at this point, but a formalized quality control procedure would require either gradient elution or a sample preparation procedure to avoid that the FSI¯ anion is extensively retained on the analytical separation column.
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