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Electrode for lithium secondary battery, method of manufacturing the same, and lithium secondary battery including the same

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Electrode for lithium secondary battery, method of manufacturing the same, and lithium secondary battery including the same


An electrode for a lithium secondary battery, the electrode including: an electrode active material; and a composite including a clay and a polymer intercalated between layers of the clay, a method of manufacturing the electrode, and a lithium secondary battery including the electrode.
Related Terms: Electrode Intercal Lithium Polymer

Browse recent Samsung Sdi Co., Ltd. patents - Yongin-si, KR
Inventors: Bum-Jin CHANG, Woon-Suk JANG, Chae-Woong CHO, Seung-Hun HAN, Ki-Jun KIM, Kwi-Seok CHOI
USPTO Applicaton #: #20130011733 - Class: 429211 (USPTO) - 01/10/13 - Class 429 
Chemistry: Electrical Current Producing Apparatus, Product, And Process > Current Producing Cell, Elements, Subcombinations And Compositions For Use Therewith And Adjuncts >Electrode >Having Connector Tab

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The Patent Description & Claims data below is from USPTO Patent Application 20130011733, Electrode for lithium secondary battery, method of manufacturing the same, and lithium secondary battery including the same.

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CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Korean Patent Application No. 10-2011-0067532, filed on Jul. 7, 2011, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.

BACKGROUND

1. Field

One or more embodiments relate to an electrode for a lithium secondary battery, a method of manufacturing the same, and a lithium secondary battery including the electrode.

2. Description of the Related Technology

A lithium secondary battery consists of a positive electrode, a negative electrode, a separator, and an electrolyte. During charging, lithium ions are deintercalated from the positive electrode and migrate toward the negative electrode, and during discharging, lithium ions are deintercalated from the negative electrode and return to the positive electrode. The positive and negative electrodes and the electrolyte do not induce any chemical reactions.

Typically, an electrode includes a mixture including an active material for storing energy, a conducting agent for supplying electric conductivity, and a binder. In general, as an active material for the positive electrode, a lithium transition metal oxide is used, and as an active material for the negative electrode, a carbonaceous active material is used. To manufacture the electrode, the mixture is mixed with a solvent to prepare a slurry, and then the slurry is coated and dried on a current collector. In this case, the binder improves dispersion of the conducting agent, an adhesive force between active material particles, between the active material and the current collector, and between the active material and the conducting agent, and conductivity of the conducting agent.

As the binder, a fluorine-based polymer material that is insoluble with respect to an organic electrolytic solution and is chemically stable, such as polyvinylidene fluoride (PVdF), is widely used.

However, if the fluorine-based polymer material, such as PVdF, is used as the binder, since chains of the fluorine-based polymer material are entangled, the binder has a high swelling ratio that indicates a degree to which the binder swells when the electrolytic solution permeates thereinto. Also, due to the interaction between the chains, when a nano-sized active material and the conducting agent are used, the solvent may separately leak out. Also, the swollen binder leads to an increase in a distance between active material particles, thereby increasing resistance of an electrode including the binder.

SUMMARY

One or more embodiments include an electrode for a lithium secondary battery in which polymer chains are less entangled and which swells less with respect to an electrolytic solution, a method of manufacturing the same, and a lithium secondary battery including the electrode.

Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.

According to one or more embodiments, an electrode for a lithium secondary battery, includes: an electrode active material; and a composite including a clay and a polymer intercalated between layers of the clay.

According to one or more embodiments, a method of manufacturing an electrode for a lithium secondary battery includes: preparing a clay dispersion by dispersing clay in a first solvent; preparing a composite by mixing the clay dispersion with a polymer or a polymer solution prepared by dissolving the polymer in a second solvent: preparing a composition for forming an electrode active material layer by adding an electrode active material to the composite and mixing the electrode active material and the composite; and coating and drying the composition on a current collector to form an electrode active material layer.

According to one or more embodiments, a method of manufacturing an electrode for a lithium secondary battery includes: melting clay and a polymer by using a heat treatment; extruding the molten product to form a composite; preparing a composition for forming an electrode active material layer by dissolving the composite in a third solvent, adding an electrode active material thereto, and mixing the resultant mixture; and coating and drying the composition on a current collector to form an electrode active material layer.

According to one or more embodiments, a lithium secondary battery includes the electrode.

The electrode may be a positive electrode.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a conceptual view of a composite included in an electrode for a lithium secondary battery, according to an embodiment;

FIG. 2 is a schematic view of a lithium ion battery according to an embodiment;

FIGS. 3 and 4 show changes in impedance when lithium batteries manufactured according to Example 1 and Comparative Example 1 are charged and discharged, respectively;

FIG. 5 is a graph of discharge capacities of coin cells manufactured according to Example 1 and Comparative Example 1; and

FIG. 6 is a graph of lifetime characteristics of coin cells manufactured according to Example 1 and Comparative Example 1.



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Copper foil for negative electrode current collector of secondary battery
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Lithium inks and electrodes and batteries made therefrom
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Chemistry: electrical current producing apparatus, product, and process
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stats Patent Info
Application #
US 20130011733 A1
Publish Date
01/10/2013
Document #
13540160
File Date
07/02/2012
USPTO Class
429211
Other USPTO Classes
429217, 427 58, 264133
International Class
/
Drawings
7


Electrode
Intercal
Lithium
Polymer


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