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

Patent metadata

Field	Value
Publication number	US-9431659-B2
Application number	US-201414341023-A
Country	US
Kind code	B2
Filing date	Jul 25, 2014
Priority date	Jul 26, 2013
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

Provided are an electrode binder for a secondary battery including an amine-based compound expressed by Chemical Formula 1 below and water-based binder particles including at least one carboxyl group as an end group, a method of preparing the same, and an electrode for a secondary battery including the electrode binder for a secondary battery

First claim

What is claimed is:

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.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Jang Bae
• Choi Im Goo
• Lee Byoung Bae
• Kim Woo Ha
• Jeong Bong Hyun
• Kim Kyoung Hun
• Yang Ji Hye

Classifications

• H01M10/052

  Li-accumulators · CPC title

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/1391

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title