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Binder for electrode composition and secondary battery comprising same

A technology of electrodes and mixtures, which is applied in secondary batteries, non-aqueous electrolyte batteries, battery electrodes, etc., and can solve problems such as poor rolling ratio, active material shedding, springback, etc.

Active Publication Date: 2015-01-21
G L CAM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the material has strong cohesive force, the rolling rate is poor, so springback occurs, and the volume expansion of the electrode causes the active material to fall off during charging and discharging, thus shortening the battery life.

Method used

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  • Binder for electrode composition and secondary battery comprising same
  • Binder for electrode composition and secondary battery comprising same
  • Binder for electrode composition and secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0076] [Preparation Example 1] The preparation method of high-purity CMC

[0077] Add 15% by weight of 50% NaOH aqueous solution, isopropyl 54% by weight of alcohol (IPA; isopropanol) and ethanol was mixed, put into a kneader (high-viscosity mixer), and stirred for one hour while maintaining a temperature of 37°C to perform alkalization.

[0078] After the alkalization reaction is finished, add 30% monochloroacetic acid (MCA; monochloroacetic acid) aqueous solution, carry out the etherification reaction under constant temperature conditions, and then use the hydrochloric acid solution diluted to 30% by ethanol to neutralize through the etherification reaction subsequent reactants. The neutralized reactant was washed three times with a mixed washing solution of ethanol and water, and finally the reactant obtained after filtering was washed with ethanol and dried (80° C. / 1 h) to obtain CMC powder.

preparation example 2

[0079] [Preparation Example 2] The preparation method of high-purity CMC

[0080] CMC powder was prepared in the same manner as in Preparation Example 1, but the reactant after the etherification reaction was neutralized with a 30% EDTA solution diluted with ethanol.

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Abstract

The present invention relates to a binder for an electrode composition and a secondary battery comprising the same and, more specifically, to a CMC for an electrode composition and a method for manufacturing the same. When the CMC of the present invention is used as a binder for an electrode composition, binding forces between active materials and an active material and a current collector can be stably maintained despite large changes in volume of cathode active materials during charging and discharging, and cracks due to the volume expansion of cathode active materials are minimized such that commercial use of high volume silicon- or tin-based cathode active materials is possible, thereby contributing to the manufacture of high-capacity lithium secondary batteries.

Description

technical field [0001] The invention relates to a binder for electrode mixture and a secondary battery containing the binder. Background technique [0002] Secondary batteries can be recharged repeatedly, are small in size, and can be easily increased in capacity. Typical examples include nickel-metal hydride (Ni-MH) batteries, lithium (Li) batteries, and lithium-ion (Li-ion) batteries. [0003] The positive electrode active material of the lithium ion battery is lithium-transition metal oxide, the negative electrode active material is carbon or carbon composite, and lithium salt is dissolved in at least one organic solvent containing hydroxyl, nitrogen, sulfonic acid, etc. When lithium ions move between the positive electrode and the negative electrode, an electromotive force is generated to realize charging and discharging. [0004] The positive and negative electrodes of the lithium-ion batteries mentioned above vary depending on the type of battery, but they are all mad...

Claims

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Application Information

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IPC IPC(8): C08B11/12H01M4/62H01M10/052
CPCC08B11/12H01M4/62H01M10/052C08L1/286H01M4/622H01M4/628H01M10/345Y02E60/10
Inventor 李元敏李秉燮张明锡安秉华郑善玉
Owner G L CAM
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