Electrode binder for secondary battery and electrode for secondary battery comprising the same

1. An electrode binder for a secondary battery comprising

water-based binder particles,

wherein the water-based binder particles comprise a polymer compound including at least one repeating structural unit composed of a vinyl group as well as at least one carboxyl group disposed on surfaces as an end group,

wherein the carboxyl group disposed on the surfaces of the water-based binder particles is coupled with an amine-based compound expressed by Chemical Formula 1, and

wherein the polymer compound including the repeating structural unit composed of a vinyl group is a styrene-butadiene rubber;

2. The electrode binder for a secondary battery of claim 1 , wherein a diameter of the water-based binder particles is in a range of 300 nm to 500 nm.

3. The electrode binder for a secondary battery of claim 1 , wherein a combination ratio (number) of the water-based binder particles : the amine-based compound expressed by Chemical Formula 1 that is coupled to the water-based binder particles is in a range of 1:4,000 to 1:6,000.

4. The electrode binder for a secondary battery of claim 1 , wherein the amine-based compound expressed by Chemical Formula 1 that is coupled to the water-based binder particles is included in an amount of 8 wt % to 10 wt % based on a total weight of monomers constituting the water-based binder particles.

5. An anode for a secondary battery comprising:

an electrode active material;

a conductive agent; and

the electrode binder for a secondary battery of claim 1 .

6. The anode for a secondary battery of claim 5 , wherein the electrode active material is an anode active material including a least one of a silicon (Si)-based active material and a carbon-based active material.

7. The anode for a secondary battery of claim 6 , wherein the carbon-based active material is formed of a crystalline carbon-based compound, an amorphous carbon-based compound, or a mixture thereof.

8. The anode for a secondary battery of claim 5 , wherein the electrode binder for a secondary battery is included in an amount of 1 wt % to 20 wt % based on a total weight of the electrode active material.

9. A lithium secondary battery comprising:

the anode for a secondary battery of claim 5 ;

a cathode;

a separator disposed between the anode and the cathode; and

a non-aqueous electrolyte.

10. A method of preparing the electrode binder for a secondary battery of claim 1 , the method comprising:

reacting a coupling agent with water-based binder particles including at least one carboxyl group as an end group in a weak acidic solution to activate the carboxyl group of the water-based binder particles;

dissolving an amine-based compound expressed by Chemical Formula 1 in a distilled water-based buffer solution; and

mixing the carboxyl group-activated water-based binder particles and the solution of the amine-based compound expressed by Chemical Formula 1 to prepare water-based binder particles to which the amine-based compound expressed by Chemical Formula 1 is coupled

11. The method of claim 10 , wherein the coupling agent comprises 1-ethyl-3 -(3-dimethylaminopropyl)-carbodiimide (EDC) and N-hydroxysuccinimide (NHS).

12. The method of claim 10 , wherein a mixing molar ratio of the coupling agent: the amine-based compound expressed by Chemical Formula 1 is in a range of 1:1 to 2:1.

13. The method of claim 10 , wherein the mixing of the carboxyl group-activated water-based binder particles and the solution of the amine-based compound expressed by Chemical Formula 1 is performed under weak acidic conditions using water as a reaction solvent.

14. The method of claim 10 , wherein 0.1 mmol of the solution of the amine-based compound expressed by Chemical Formula 1 is mixed with 10 ml of the carboxyl group-activated water-based binder particle solution, and

this corresponds to a concentration at which 4,000 to 6,000 molecules of the compound of Chemical Formula 1 are coupled to one water-based binder particle.