Positive active material for rechargeable lithium battery and method of preparing same

Inactive Publication Date: 2005-04-21
KWEON HO JIN +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0006] It is an object of the present invention to provide a manganese-based positive active material f

Problems solved by technology

However, as compared to other lithiated transition metal oxides such as LiCoO2 and LiNiO2, LiMn2O4 has a relatively low discharge capacity.
Furthermore, when high rate of charge and discharge operations are cycled, the discharge capacity is excessively reduced.
In particular, when the

Method used

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

Examples

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Example

EXAMPLE 1

[0018] An aluminum isopropoxide solution having a 5 weight-percent concentration was prepared by refluxing an aluminum isopropoxide powder in ethanol at about 100° C. for about half an hour. The aluminum isopropoxide solution was then mixed with a powder of LixMn2-yAlyO4-zFz where 06 for a solute.

Example

EXAMPLE 2

[0019] The positive electrode preparing procedure was performed in the same way as in Example 1 with the exception that the heat-treating temperature was heightened up to 900° C. A coin-type half cell was fabricated with the resulting positive electrode in combination with other components as described in Example 1.

Example

EXAMPLE 3

[0020] An aluminum isopropoxide solution having a 5 weight-percent concentration was prepared by refluxing an aluminum isopropoxide powder in ethanol at about 100° C. for about half an hour. The aluminum isopropoxide solution was then mixed with a powder of LixMn2O4 where 0

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Abstract

A positive active material for rechargeable lithium batteries includes an active material component processed from a manganese-based compound. The transition metal compound is selected from LixMnO2, LixMnF2, LixMnS2, LixMnO2-zFz, LixMnO2-zSz, LixMn1-yMyO2, LixMn1-yMyF2, LixMn1-yMyS2, LixMn1-yMyO2-zFz, LixMn1-yO2-zSz, LixMn2O4, LixMn2F4, LixMn2S4, LixMn2O4-zFz, LixMn2O4-zSz, LixMn2-yMyO4, LixMn2-yMyF4, LixMn2-yMyS4, LixMn2-yMyO4-zFz, or LixMn2-yMyO4-zSz where 0<x≦1.5, 0.05≦y≦0.3, z≦1.0 and M is selected from Al, Co, Cr, Mg, Fe or La. A metallic oxide is coated on the active material component.

Description

BACKGROUND OF THE INVENTION [0001] (a) Field of the Invention [0002] The present invention relates to a positive active material for rechargeable lithium batteries and a method of preparing the same and, more particularly, to a manganese-based positive active material for rechargeable lithium batteries which has a good cycle life characteristic. [0003] (b) Description of the Related Art [0004] Generally, manganese-based compounds such as LiMn2O4 and LiMnO2 are the positive active material of choice for rechargeable lithium batteries because of their low cost, abundance and environmentally friendly characteristics. Among such manganese-based compounds, LiMn2O4 is particularly stable for the battery use and thus attractive for the electric vehicle application. [0005] However, as compared to other lithiated transition metal oxides such as LiCoO2 and LiNiO2, LiMn2O4 has a relatively low discharge capacity. Furthermore, when high rate of charge and discharge operations are cycled, the di...

Claims

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Application Information

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IPC IPC(8): H01M10/05B82Y99/00H01M4/131H01M4/1315H01M4/50H01M4/505H01M4/58H01M10/0525H01M10/36
CPCH01M4/131H01M4/1315H01M4/505H01M4/581Y10T29/49108Y02E60/122Y02T10/7011Y10T29/49115H01M10/0525Y02E60/10H01M4/04H01M4/36
Inventor KWEON, HO-JINKIM, GEUN-BAEPARK, DONG-GONNOH, HYUNG-GON
Owner KWEON HO JIN
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