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Negative electrode for rechargeable lithium battery and rechargeable lithium battery comprising same

A technology for rechargeable lithium batteries and electrodes, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of poor adhesion, poor dispersion, and no cycle life characteristics.

Active Publication Date: 2007-06-20
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials have poor adhesion and do not have good cycle life characteristics compared to PVDF
In addition, SBR has high expansion and tends to aggregate in the slurry, resulting in poor dispersion

Method used

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  • Negative electrode for rechargeable lithium battery and rechargeable lithium battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 95 parts by weight of artificial graphite used as negative electrode active material are mixed with polyethylene emulsion of 2.5 parts by weight and carboxymethylcellulose (CMC) of 2.5 parts by weight, after that, by dispersing the mixture in 200 parts by weight of pure water , to prepare negative electrode slurry. The slurry was coated on a copper foil, dried, and pressed with a roll press, thereby preparing a negative electrode having an active material density of 1.5 g / cc.

[0046] 90 parts by weight of LiCoO used as positive electrode active material 2 , 5 parts by weight of polyvinylidene fluoride (PVdF) used as a binder, and 5 parts by weight of Super-P used as a conductive agent were mixed, and then, by dispersing the mixture in 100 parts by weight of N-methyl- 2-pyrrolidone to prepare positive electrode slurry. The slurry was coated on an aluminum foil, dried, and pressed with a roll press, thereby preparing a positive electrode having an active material densi...

Embodiment 2

[0049] 98 parts by weight of artificial graphite used as a negative electrode active material were mixed with 1 part by weight of polyethylene emulsion and 1 part by weight of carboxymethylcellulose (CMC), after which, by dispersing the mixture in 200 parts by weight of pure water , to prepare negative electrode slurry. The slurry was coated on a copper foil, dried, and pressed with a roll press, thereby preparing a negative electrode having an active material density of 1.5 g / cc. Using this negative electrode, a lithium unit cell was prepared in the same manner as in Example 1.

Embodiment 3

[0051] 95 parts by weight of natural graphite used as negative electrode active material are mixed with polyethylene emulsion of 2.5 parts by weight and carboxymethylcellulose (CMC) of 2.5 parts by weight, after that, by dispersing the mixture in 200 parts by weight of pure water , to prepare negative electrode slurry. The slurry was coated on a copper foil, dried, and pressed with a roll press, thereby preparing a negative electrode having an active material density of 1.5 g / cc. Using this negative electrode, a lithium unit cell was prepared in the same manner as in Example 1.

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PUM

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Abstract

The present invention relates to an electrode for a rechargeable lithium battery comprising an emulsion binder, and a lithium secondary battery including the same. The electrode comprises a current collector coated with an active material layer including active material powder, a polyolefinic polymer, and a water-soluble polymer. The polyolefinic polymer binder has better binding properties than a conventional polyvinylidene fluoride, and sufficient adhesion can be realized using a small amount. A decrease in the amount of the binder, which is non-conductive, improves charge-discharge capacity and cycle life characteristics. The polyolefinic polymer has a good crystallization degree and reduces electrode expandability resulting in improved cycle-life characteristics for the electrode.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Application No. 10-2003-0081042 filed with the Korean Patent Office on November 17, 2003, the disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to an electrode for a rechargeable lithium battery, and a lithium secondary battery including the same, and more particularly, the present invention relates to an electrode having good adhesion and capable of improving the capacity and cycle life characteristics of a rechargeable lithium battery. Electrodes for rechargeable lithium batteries, and lithium secondary batteries including it. Background technique [0004] Recently, carbonaceous materials that do not generate Li dendrites have been introduced to replace Li metal as anode active materials for rechargeable Li batteries. The negative electrode is prepared as follows: the negative active material and binder, and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/62H01M4/36H01M10/40H01M4/66H01M4/133H01M4/134H01M4/38H01M4/40H01M4/587H01M4/74H01M4/80H01M6/10H01M10/05
CPCH01M2004/027H01M4/621H01M4/133Y02E60/122H01M4/405H01M4/625H01M4/622H01M4/0404H01M4/626H01M4/661H01M4/0435H01M10/052H01M4/134H01M6/10H01M10/0525H01M4/38H01M4/386H01M4/387Y02E60/10H01M4/62
Inventor 梁好晶黄相文
Owner SAMSUNG SDI CO LTD