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Positive active material for rechargeable lithium batteries and method of preparing the same

a rechargeable lithium battery and active material technology, applied in the direction of nickel compounds, cell components, sustainable manufacturing/processing, etc., can solve the problems of difficult preparation in the desired structure, low capability of manganese-based materials, and high cost, so as to improve cycle life and power capacity , the effect of good voltage performan

Inactive Publication Date: 2009-07-07
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]It is an object of the present invention to provide a positive active material for a rechargeable lithium battery cell exhibiting better cycle-life characteristics, enhanced power capability, and good voltage performance.

Problems solved by technology

Recently, however, carbon materials such as amorphous carbon or crystalline carbon-based materials, which reversibly intercalate lithium ions, are extensively used instead of the metallic lithium due to problems of high reactivity toward electrolyte and dendrite formation of the metallic lithium.
However, manganese-based materials have a disadvantage of a relatively low capability.
LiNiO2 is inexpensive and has high capacity, but is difficult to prepare in the desired structure.
Although most of the current commercially available rechargeable lithium batteries (approximately 95%) use LiCoO2 as the positive active material, it is rather expensive.
Therefore, there are considerable demands to find a less expensive alternative material.

Method used

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  • Positive active material for rechargeable lithium batteries and method of preparing the same
  • Positive active material for rechargeable lithium batteries and method of preparing the same
  • Positive active material for rechargeable lithium batteries and method of preparing the same

Examples

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example 1

[0070]A 1% ethanol suspension of tetraethylorthosilicate was prepared by diluting 98% tetraethylorthosilicate (available from Aldrich Co.) suspension with ethanol. A 1% Al-isopropoxide ethanol suspension was prepared by dissolving Al-isopropoxide powders in ethanol.

[0071]The tetraethylorthosilicate ethanol suspension was mixed with the Al-isopropoxide ethanol suspension in equal volume ratios to provide a coating liquid having ½% Al and ½% Si.

[0072]100 g of LiCoO2 powder (available from UMKorea) was added to 40 ml of the coating liquid followed by mixing for about 10 minutes in an agitator to coat the LiCoO2 powder with the suspension. The resultant product was allowed to stand for 30 minutes, rendering separation of a solid fraction and a suspension fraction, then a solid phase material was obtained by removing the suspension fraction. The obtained solid phase material was dried at 100° C. for 10 hours, and an Al and Si-included hydroxide layer was formed on the surface of the LiCo...

example 2

[0074]A coin-type cell was fabricated by the same procedure as in Example 1, except that a 10% tetraethylorthosilicate suspension was mixed with a 10% Al-isopropoxide suspension to provide a coating liquid including 5% Al and 5% Si. The drying process was performed at 50° C. for 10 hours.

example 3

[0075]A coin-type cell was fabricated by the same procedure as in Example 1, except that a 2% tetraethylorthosilicate suspension was mixed with a 10% Al-isopropoxide suspension to provide a coating liquid including 5% Al and 1% Si. The drying process was performed at 85° C. for 10 hours.

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Abstract

A positive active material includes a core including a lithiated compound, and at least two surface-treatment layers formed on the core. The surface-treatment layer includes at least one compound selected from the group consisting of a coating-element-included hydroxide, a coating-element-included oxyhydroxide, a coating-element-included oxycarbonate, and a coating-element-included hydroxycarbonate. The coating element is selected from the group consisting of Mg, Al, Co, K, Na, Ca, Si, Ti, Sn, V, Ge, Ga, B, and As.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is based on Korean Patent Application No. 2001-3212 filed in the Korean Industrial Property Office on Jan. 19, 2001, the disclosure of which is incorporated hereinbyherein by reference. The application is a reissue of U.S. Pat. No. 6,797,435, which issued Sep. 28, 2004, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a positive active material for a rechargeable lithium battery and a method of preparing the same, and more particularly, to a positive active material for a rechargeable lithium battery having improved capability, power, and cycle-life characteristics, and a method of preparing the same.[0004]2. Description of the Related Art[0005]Generally, rechargeable lithium batteries use a material from or into which lithium ions are deintercalated or intercalated for positive and negative active materials. For an ...

Claims

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Application Information

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IPC IPC(8): H01M4/50C01G45/00B05D5/12C01G51/00C01G53/00H01M4/02H01M4/04H01M4/36H01M4/505H01M4/525H01M4/62H01M10/05H01M10/38
CPCH01M4/0402H01M4/131H01M4/1391H01M4/366H01M4/505H01M4/5825H01M4/62H01M4/04H01M4/525Y10T29/49115H01M10/0525Y02E60/122Y02E60/10Y02P70/50H01M4/48
Inventor KWEON, HO-JINSUH, JUN-WON
Owner SAMSUNG SDI CO LTD