Composition for gel polymer electrolyte, gel polymer electrolyte prepared therefrom, and electrochemical device including the same

1. A gel polymer electrolyte composition, comprising:

a lithium salt,

an organic solvent,

a polymerization initiator,

a compound represented by the following Formula 1, and

a compound represented by the following Formula 2:

in Formula 1,

R and R′ each independently represent a linear or non-linear alkylene group having 1 to 5 carbon atoms,

R 1 and R 2 each independently represent a linear or non-linear alkyl group having 1 to 5 carbon atoms, —(O)CCH═CH 2 , or —(O)C(CH 3 )C═CH 2 ,

R 3 is an acrylate group (—O(O)CCH═CH 2 ) or a methacrylate group (—O(O)C(CH 3 )C═CH 2 ),

n1, n2, and n3 each independently represent an integer of 0 to 9, and

m is an integer of 0 to 3,

in Formula 2,

R″ and R″′ each independently represent a linear or non-linear alkylene group having 1 to 5 carbon atoms,

R 4 , R 5 , and R 6 each independently represent an acrylate group (—O(O)CCH═CH 2 ) or a methacrylate group (—O(O)C(CH 3 )C═CH 2 ), and

o is an integer of 0 to 9,

wherein the compound represented by Formula 1 and the compound represented by Formula 2 are included in an amount of 0.5 wt % to 20 wt % based on the total weight of the gel polymer electrolyte composition, and

wherein a weight ratio of the compound represented by Formula 1 to the compound represented by Formula 2 is in a range of 1:4 to 1:50.

2. The gel polymer electrolyte composition according to claim 1 , wherein the compound represented by Formula 1 is one or more selected from the group consisting of compounds represented by the following Formulas 1a to 1c:

3. The gel polymer electrolyte composition according to claim 1 , wherein the compound represented by Formula 2 is a compound represented by the following Formula 2a or 2b:

4. The gel polymer electrolyte composition according to claim 1 , wherein the compound represented by Formula 1 and the compound represented by Formula 2 are included in an amount of 2.0 wt % to 10 wt % based on the total weight of the gel polymer electrolyte composition.

5. The gel polymer electrolyte composition according to claim 1 , wherein a weight ratio of the compound represented by Formula 1 to the compound represented by Formula 2 is in a range of 1:4 to 1:8.

6. The gel polymer electrolyte composition according to claim 1 , wherein the lithium salt includes Li + as a cation, and includes one or more selected from the group consisting of F − , Cl − , Br − , I − , NO 3 − , N(CN) 2 − , BF 4 − , ClO 4 − , AlO 4 − , AlCl 4 − , PF 6 − , SbF 6 − , AsF 6 − , BF 2 C 2 O 4 − , BC 4 O 8 − , (CF 3 ) 2 PF 4 − , (CF 3 ) 3 PF 3 − , (CF 3 ) 4 PF 2 − , (CF 3 ) 5 PF − , (CF 3 ) 6 P − , CF 3 SO 3 − , C 4 F 9 SO 3 − , CF 3 CF 2 SO 3 − , (CF 3 SO 2 ) 2 N − , (F 2 SO 2 ) 2 N − , CF 3 CF 2 (CF 3 ) 2 CO − , (CF 3 SO 2 ) 2 CH − , CF 3 (CF 2 ) 7 SO 3 − , CF 3 CO 2 − , CH 3 CO 2 − , SCN − , and (CF 3 CF 2 SO 2 ) 2 N − as an anion.

7. The gel polymer electrolyte composition according to claim 1 , wherein the polymerization initiator is included in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the total compounds including the compound represented by Formula 1 and the compound represented by Formula 2.

8. The gel polymer electrolyte composition according to claim 1 , wherein the organic solvent is a non-aqueous organic solvent selected from the group consisting of a cyclic carbonate, a linear carbonate, a lactone, an ether, an ester, a sulfoxide, an acetonitrile, a lactam, and a ketone.

9. A gel polymer electrolyte, prepared by curing the gel polymer electrolyte composition according to claim 1 .

10. The gel polymer electrolyte according to claim 9 , comprising an oligomer prepared by a polymerization reaction between the compound represented by Formula 1 and the compound represented by Formula 2.

11. An electrochemical device, comprising:

a positive electrode;

a negative electrode;

a separator interposed between the positive electrode and the negative electrode; and

the gel polymer electrolyte according to claim 9 .

12. The electrochemical device according to claim 11 , wherein the electrochemical device is a lithium secondary battery.