Non-aqueous electrolyte containing lifsi salt for fast charging/discharging of lithium-ion battery

A lithium-ion battery comprising:

• (a) an anode;
• (b) a cathode;
• and
• (c) an electrolyte composition comprising lithium bis(fluorosulfonyl)imide (LiFSI) dissolved in a solvent system comprising the following solvent components:
• (i) ethylene carbonate and/or propylene carbonate in an amount of 5-70 wt % by weight of the solvent system;
• (ii) at least one additional solvent selected from acyclic carbonate, acyclic or cyclic ester, and acyclic or cyclic ether solvents having a molecular weight of no more than 110 g/mol, wherein said at least one additional solvent is in an amount of 30-70 wt % by weight of the solvent system;
• and optionally, (iii) a higher molecular weight solvent selected from acyclic carbonate, acyclic or cyclic ester, and acyclic or cyclic ether solvents having a molecular weight above 110 g/mol, wherein said higher molecular weight solvent is in an amount up to 30 wt % by weight of the solvent system;
• wherein the wt % amounts for solvent components (i), (ii), and (iii) sum to 100 wt %, and wherein said LiFSI is present in the solvent system in a concentration of 1.2 M to about 2 M.