Tfsi-based salts and polymer electrolytes and their use in lithium-ion batteries

An electrolyte solution comprising an electrolyte compound dissolved in a solvent, wherein the electrolyte compound has the following structure:

• wherein:
• A is a linear, branched, or cyclic hydrocarbon group containing at least one carbon atom and optionally containing one or more heteroatoms selected from N, O, and S;
• Y1 and Y2 are independently selected from H atom and a sulfonylimide group of the formula
• wherein B+ is an alkali metal ion;
• wherein at least one of Y1 and Y2 is said sulfonylimide group;
• and
• m is an integer of at least 1.

A lithium-ion battery comprising:

• a) an anode;
• (b) a cathode;
• and
• (c) an electrolyte solution in contact with said anode and cathode and comprising an electrolyte compound dissolved in or plasticized with a solvent, wherein the electrolyte compound has the following structure:
• wherein:
• A is a linear, branched, or cyclic hydrocarbon group containing at least one carbon atom and optionally containing one or more heteroatoms selected from N, O, and S;
• Y1 and Y2 are independently selected from H atom and a sulfonylimide group of the formula
• wherein B+ is an alkali metal ion;
• wherein at least one of Y1 and Y2 is said sulfonylimide group;
• and
• m is an integer of at least 1.