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The cell property, adhesive property and coating property-controlled binder for lithium secondary battery with 2 or more phases

A technology for bonding strength and battery performance, applied in the field of adhesives and its preparation, can solve problems such as capacity reduction

Active Publication Date: 2006-01-11
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these prior art binders cannot provide sufficient bonding strength between the active material and the current collector, thus there is a problem of rapid capacity degradation due to repeated cycles of charge / discharge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] [Adhesive composition]

[0050] 196.0 g of deionized water was added to the reactor and the temperature was raised to 75°C. When the temperature of the deionized water reached 75°C, 49.8 g of styrene, 46.5 g of 1,3-butadiene and 0.65 g of sodium lauryl sulfate were added thereto. And then, keeping the internal temperature of the reactor at 75° C., 0.32 g of potassium persulfate dissolved in 10.0 g of deionized water was added to complete the polymerization of the polymer (a).

[0051] 93.0 g of deionized water, 30.0 g of styrene, 60.1 g of butyl acrylate, 0.8 g of aryl methacrylate, 5.4 g of itaconic acid and 0.15 g of dodecyl were gradually added to polymer (a) within 3 hours An emulsified mixture of sodium sulfate was added simultaneously with 0.21 g of potassium persulfate dissolved in 10.0 g of deionized water to complete the polymerization of polymer (b).

[0052] The pH of the composite polymer product obtained above was adjusted to pH 7 using potassium hydroxid...

Embodiment 2

[0068] [Adhesive composition]

[0069] Repeat the same polymerization method in Example 1 to form polymer (a), then gradually add 93.0g deionized water, 30.0g styrene, 60.1g butyl acrylate, 0.8g formazan to polymer (a) within 3 hours an emulsified mixture of aryl acrylate, 2.0 g itaconic acid, 1.4 g acrylamide, 2.0 g acrylic acid and 0.15 g sodium lauryl sulfate, while adding 0.21 g potassium persulfate dissolved in 10.0 g deionized water to complete Polymerization of polymer (c).

[0070] An adhesive composition was prepared by the same method as in Example 1, and the same method for measuring specific physical properties as in Example 1 was repeated. As a result, the particle diameter was 158 nm, the glass transition temperature was -5°C, and the gel content was 86%.

[0071] In addition, the method of preparing a slurry from the adhesive composition, the product method of preparing a battery, evaluation of battery performance, evaluation of adhesive strength and coating p...

Embodiment 3 to Embodiment 7

[0073] Repeat Example 1 or Example 2, except that the monomers used in the adhesive composition were changed to those described in Table 1 below to polymerize polymer (a) and polymer (b) or polymer (a ) and polymer (c) formed composite polymer particles.

[0074] Other methods of preparing the adhesive composition, measuring specific physical properties, preparing slurry, forming batteries and evaluating battery performance, adhesive strength and coating performance were the same as those described in Example 1.

[0075] Example 3

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Abstract

Disclosed is a binder comprising composite polymer particles having a structure formed of two or more phases different in terms of cell property, adhesive strength and / or coating property. The binder provides excellent cell property, adhesive strength and coating property, and thus the binder is used in an electrode of a lithium secondary battery to improve the cell performance.

Description

technical field [0001] The present invention relates to a binder for lithium secondary batteries and a preparation method thereof, including a binder composition of the binder, a slurry using the binder composition, an electrode formed from the slurry, and a A lithium secondary battery prepared by the electrode. Background technique [0002] Recently, developments in size reduction and weight reduction for portable computers, portable phones, camcorders, etc. are continuously progressing. Thus, secondary batteries, which are energy sources for the above-mentioned electronic devices, require increased capacity, reduced size, reduced weight, and thin-film technology. In particular, lithium secondary batteries have advantages of high voltage, long life, high energy density, etc., and thus have been produced and sold through active research. [0003] The performance of lithium secondary batteries depends on the electrodes, electrolyte and other battery materials used therein. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/621Y02E60/122H01M4/622H01M10/052H01M10/0525Y02E60/10A63B49/08A63B60/28A63B2102/04
Inventor 金海永柳东雕金周炫韩章善
Owner LG CHEM LTD