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Negative active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery comprising the same

a rechargeable lithium battery and negative active material technology, which is applied in the direction of active material electrodes, non-aqueous electrolyte accumulator electrodes, cell components, etc., can solve the problems of deterioration of the cycle characteristics of the rechargeable lithium battery, the negative active material itself has not yet been commercialized as negative active materials, and the deterioration of the cycle life of the battery. achieve the effect of improving the cycle life characteristics

Inactive Publication Date: 2013-07-25
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The carbon-based coating enhances the cycle-life and initial efficiency of lithium batteries by preventing pulverization and maintaining electrical conductivity, thereby improving the overall performance of the battery.

Problems solved by technology

However, elemental materials themselves have not yet been commercialized as negative active materials because the elements such as Si, Sn, Al, and so on form alloys with lithium during charge-discharge and undergo volume expansion and contraction resulting in element pulverization.
As a result, the cycle-life of the batteries may be deteriorated.
Thereby, as the silicon compound has low electro-conductivity, the silicon compound is insufficiently utilized for negative active materials and the cycle characteristics of the rechargeable lithium battery are deteriorated.
Thereby, the linkage of the silane coupling agent is broken to release the silicon compound from the graphite such that the silicon compound is insufficiently utilized as a negative active material.
As a result, the cycle characteristics of the rechargeable lithium battery are deteriorated.
Further, the silane coupling agent may not be uniformly treated upon preparing the negative electrode material so that it is difficult to provide a negative electrode material having consistent quality.
Further, the material in which a metal such as Si is bound with or coated on the graphite-based carbonaceous material has the same problems.
Thereby, the metal is separated and thus is not sufficiently utilized as a negative active material.
As a result, cycle-life characteristics of the lithium rechargeable battery are deteriorated.

Method used

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  • Negative active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery comprising the same
  • Negative active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery comprising the same
  • Negative active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery comprising the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0069]100 ml of water, 500 g of zirconia balls, 20 g of crystalline carbon fiber, and 0.5 g of Orotan™ (Hanjung Chem Co.) were put in a 300 ml, plastic bottle and then ball-milled for 2 hours to prepare a mixed solution in which the carbon fiber was completely dispersed. Then, 1 g of gelatin was dissolved in 200 ml, of water. 100 g of Si powder (average particle diameter of 10 μm) was added to the mixed solution, which was then agitated and the pH controlled at 7. The above carbon fiber dispersion solution was then added, and acetic acid was used to regulate the pH to 3 to 4. The resulting solution was agitated for 10 minutes and then allowed to stand for 1 to 2 minutes. Then, Si particles coated with carbon fiber precipitated to the bottom and were recovered. The Si particles coated with carbon fiber were fired at 500° C. to remove the gelatin, thereby preparing a negative active material.

[0070]The prepared negative active material and a nickel powder were added to a binder solutio...

example 2

[0073]A half cell was fabricated as in Example 1 except that carbon black having an average particle diameter of 10 nm was used instead of the crystalline carbon fiber.

example 3

[0074]A half cell was fabricated as in Example 1 except that carbon nanotubes were used instead of the crystalline carbon fiber.

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Abstract

Negative active materials for rechargeable lithium batteries, methods of manufacturing the negative active materials, and rechargeable lithium batteries including the negative active materials are provided. One negative active material includes an active metal core and a crack inhibiting layer formed on the core. The crack inhibiting layer includes a carbon-based material.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of U.S. patent application Ser. No. 11 / 604,099, filed Nov. 22, 2006, which claims priority to and the benefit of Korean Patent Application No. 10-2005-0116028, filed Nov. 30, 2005, the entire content of both of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to negative active materials for rechargeable lithium batteries, methods of manufacturing the same, and rechargeable lithium batteries including the same.BACKGROUND OF THE INVENTION[0003]The use of portable electronic instruments is increasing as electronic equipment gets smaller and lighter due to developments in high-tech electronic industries. Therefore, studies on high-capacity negative active materials are actively being pursued in accordance with an increased need for batteries having high energy densities for use as power sources in these portable electronic instruments. Even though graphite i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/133H01M4/02H01M4/134H01M4/139H01M4/1393H01M4/1395H01M10/0525H01M10/36
CPCH01M4/133H01M4/134H01M4/139H01M4/1393Y02E60/122H01M10/0525H01M2004/021H01M2004/027H01M4/1395Y02E60/10H01M4/04H01M4/38H01M4/58
Inventor KANG, YONG-MOOKCHOI, NAM-SOONKIM, SUNG-SOO
Owner SAMSUNG SDI CO LTD
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