Electrode for lithium secondary battery, method for preparing same, electrode assembly for lithium secondary battery comprising same, and lithium secondary battery comprising same

1. An electrode for a lithium secondary battery, which comprises an electrode active material, an aqueous binder, a compound represented by the following Formula 1 and a compound represented by the following Formula 2:

wherein, in Formula 1 and 2,

R 1 to R 3 are each independently one selected from the group consisting of an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms and a halogen atom,

R 4 is one selected from the group consisting of N(R 7 ) 2 , R 8 SH, R 8 Si(OR 7 ) 3 and an alkyl group having 1 to 3 carbon atoms,

R 5 to R 7 are each independently hydrogen or an alkyl group having 1 to 3 carbon atoms,

R 8 is an alkylene group having 1 to 3 carbon atoms, and

n is an integer selected from 1 to 6.

2. The electrode for a lithium secondary battery of claim 1 , wherein one compound selected from the group consisting of the compound represented by Formula 1, the compound represented by Formula 2 and combinations thereof is a cross-linker which crosslinks the aqueous binder.

3. The electrode for a lithium secondary battery of claim 1 , wherein the compound represented by Formula 1 and the compound represented by Formula 2 are chemically combined to form a compound represented by the following Formula 3:

wherein, in Formula 3,

R 1 to R 3 are each independently one selected from the group consisting of an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms and a halogen atom,

R 4 is one selected from the group consisting of N(R 7 ) 2 , R 8 SH, R 8 Si(OR 7 ) 3 and an alkyl group having 1 to 3 carbon atoms,

R 5 to R 7 are each independently hydrogen or an alkyl group having 1 to 3 carbon atoms,

R 8 is an alkylene group having 1 to 3 carbon atoms, and

n is an integer selected from 1 to 6.

4. The electrode for a lithium secondary battery of claim 1 , wherein, in Formula 1 and 2, all of R 1 to R 3 are an alkoxy group having 1 to 3 carbon atoms and R 4 is one selected from the group consisting of N(R 7 ) 2 , R 8 SH and R 8 Si(OR 7 ) 3 .

5. The electrode for a lithium secondary battery of claim 1 , wherein the aqueous binder is one selected from the group consisting of carboxymethyl cellulose (CMC), alginate, carbonyl-β-cyclodextrine and nafion.

6. The electrode for a lithium secondary battery of claim 1 , wherein the electrode for a lithium secondary battery comprises 0.1 to 40% by weight of the aqueous binder, 0.1 to 20% by weight of the compound represented by Formula 1 and the compound represented by Formula 2 and the remaining content of the electrode active material, based on a total weight of the electrode.

7. The electrode for a lithium secondary battery of claim 1 , wherein the electrode for a lithium secondary battery is a positive electrode.

8. The electrode for a lithium secondary battery of claim 7 , wherein the lithium secondary battery is a lithium sulfur battery, and the positive electrode active material is one selected from the group consisting of elemental sulfur (S 8 ), a sulfur-based compound and mixtures thereof.

9. The electrode for a lithium secondary battery of claim 1 , wherein R 4 in Formula 2 is R 8 SH.

10. The electrode for a lithium secondary battery of claim 3 , wherein R 4 in Formula 3 is R 8 SH.

11. A method for preparing an electrode for a lithium secondary battery, which comprises the steps of

mixing an electrode active material, an aqueous binder, a compound represented by the following Formula 1 and a compound represented by the following Formula 2 to prepare a slurry for forming an electrode, and

coating at least one side of a current collector by the slurry for forming an electrode to prepare the electrode:

wherein, in Formula 1 and 2,

R 1 to R 3 are each independently one selected from the group consisting of an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms and a halogen atom,

R 4 is one selected from the group consisting of N(R 7 ) 2 , R 8 SH, R 8 Si(OR 7 ) 3 and an alkyl group having 1 to 3 carbon atoms,

R 5 to R 7 are each independently hydrogen or an alkyl group having 1 to 3 carbon atoms,

R 8 is an alkylene group having 1 to 3 carbon atoms, and

n is an integer selected from 1 to 6.

12. The method for preparing an electrode for a lithium secondary battery of claim 11 , wherein the compound represented by Formula 1 and the compound represented by Formula 2 are chemically combined to form a compound represented by the following Formula 3:

wherein, in Formula 3,

R 1 to R 3 are each independently one selected from the group consisting of an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms and a halogen atom,

R 4 is one selected from the group consisting of N(R 7 ) 2 , R 8 SH, R 8 Si(OR 7 ) 3 and an alkyl group having 1 to 3 carbon atoms,

R 5 to R 7 are each independently hydrogen or an alkyl group having 1 to 3 carbon atoms,

R 8 is an alkylene group having 1 to 3 carbon atoms, and

n is an integer selected from 1 to 6.

13. The method for preparing an electrode for a lithium secondary battery of claim 11 , wherein the step of preparing the slurry for forming an electrode comprises: mixing the aqueous binder, the compound represented by Formula 1 and the compound represented by Formula 2 and then mixing with the electrode active material.

14. An electrode assembly for a lithium secondary battery, which has a positive electrode and a negative electrode which are alternately laminated using a separator as a boundary, and at least one among the positive electrode and the negative electrode are the electrode for a lithium secondary battery according to claim 1 .

15. The method for preparing an electrode for a lithium secondary battery of claim 11 , wherein R 4 in Formula 2 is R 8 SH.

16. The method for preparing an electrode for a lithium secondary battery of claim 12 , wherein R 4 in Formula 3 is R 8 SH.