Polymeric gel electrolyte and lithium battery employing the same

A method of forming a polymeric gel electrolyte comprising:

• preparing a terpolymer precursor having a repeating unit represented by formula 1, a repeating unit represented by formula 2 and a repeating unit represented by formula 3:
• wherein n is an integer from 1 to 12, and R is a C1 to C12 alkyl group:
• mixing a lithium salt and an organic solvent with the terpolymer precursor;
• and
• crosslinking the terpolymer precursor,
• wherein the terpolymer precursor is crosslinked via a crosslinking agent.

A lithium battery comprising:

• an electrode assembly having a cathode, an anode and a separator interposed therebetween;
• a polymeric gel electrolyte comprising a lithium salt, an organic solvent and a curing product of a terpolymer precursor having a repeating unit represented by formula 1, a repeating unit represented by formula 2 and a repeating unit represented by formula 3:
• wherein n is an integer from 1 to 12, and R is a C1 to C12 alkyl group;
• and
• a case accommodating the electrode assembly and the polymeric gel electrolyte, and
• wherein the lithium salt is at least one salt selected from the group consisting of lithium perchlorate (LiClO4), lithium tetrafluoroborate (LiBF4), lithium hexafluorophosphate (LiPF6), lithium trifluoromethanesulfonate (LiCF3SO3) and lithium bistrifluoromethanesulfonyl amide (LiN(CF3SO2)2), and
• the organic solvent is at least one solvent selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), methylethyl carbonate (MEC), diethyl carbonate (DEC) and vinylene carbonate (VC).

A method of forming a lithium battery comprising:

• obtaining a composition for forming en electrolyte by a process comprising:
• preparing a terpolymer precursor having a repeating unit represented by formula 1, a repeating unit represented by formula 2 and a repeating unit represented by formula 3:
• wherein n is an integer from 1 to 12, and R is a C1 to C12 alkyl group;
• and
• mixing a lithium salt and an organic solvent with the terpolymer precursor,
• sandwiching a separator and the composition for forming an electrolyte between a cathode and anode;
• and
• crosslinking the terpolymer precursor, and
• wherein the lithium salt is at least one salt selected from the group consisting of lithium perchlorate (LiClO4, lithium tetrafluoroborate (LiBF4 lithium hexafluorophosphate (LiPF6), lithium trifluoromethanesulfonate (LiCF3SO3) and lithium bistrifluoromethanesulfonyl amide (LiN(CF3SO2)2), and
• the organic solvent is at least one solvent selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), methylethyl carbonate (MEC), diethyl carbonate (DEC) and vinylene carbonate (VC).

A polymeric gel electrolyte comprising:

• a lithium salt;
• an organic solvent;
• and
• a cross-linked polymerizing product of a crosslinking agent and a terpolymer precursor having a repeating unit represented by formula 1, a repeating unit represented by formula 2 and a repeating unit represented by formula 3:
• wherein n is an integer from 1 to 12, and R is a C1 to C12 alkyl group, and
• wherein:
• the lithium salt is at least one salt selected from the group consisting of lithium perchlorate (LiClO4), lithium tetrafluoroborate (LiBF4, lithium hexafluorophosphate (LiPF8), lithium trifluoromethanesulfonate (LiCF3SO3) and lithium bistrifluoromethanesulfonyl amide (LiN(CF3SO2)2), and
• the organic solvent is at least one solvent selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), methylethyl carbonate (MEC), diethyl carbonate (DEC) and vinylene carbonate (VC).

A lithium battery comprising:

• an electrode assembly having a cathode, an anode and a separator interposed therebetween;
• a polymeric gel electrolyte comprising a lithium salt, an organic solvent and a polymerizing product of a crosslinking agent and a terpolymer precursor having a repeating unit represented by formula 1, a repeating unit represented by formula 2 and a repeating unit represented by formula 3:
• wherein n is an integer from 1 to 12, and R is a C1 to C12 alkyl group;
• and
• a case accommodating the electrode assembly and the polymeric gel electrolyte, and
• wherein the lithium salt is at least one salt selected from the group consisting of lithium perchlorate (LiClO4 lithium tetrafluoroborate (LiBF4), lithium hexafluorophosphate (LiPF6), lithium trifluoromethanesulfonate (LiCF3SO3) and lithium bistrifluoromethanesulfonyl amide (LiN(CF3SO2)2, and
• the organic solvent is at least one solvent selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), dimethyl carbonate (DMC), methylethyl carbonate (MEC), diethyl carbonate (DEC) and vinylene carbonate (VC).