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Method for preparing positive electrode active material of rechargeable lithium cell

A technology for positive active materials and rechargeable lithium batteries, which can be used in battery electrodes, non-aqueous electrolyte batteries, positive electrodes, etc., and can solve the problems of low capacity, difficulty in manufacturing, and instability of manganese-based materials

Inactive Publication Date: 2002-04-24
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, manganese-based materials have a lower capacity
LiNiO 2 Inexpensive and high capacity, but difficult to fabricate in desired structures, and relatively unstable in state of charge leading to battery safety issues

Method used

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  • Method for preparing positive electrode active material of rechargeable lithium cell
  • Method for preparing positive electrode active material of rechargeable lithium cell
  • Method for preparing positive electrode active material of rechargeable lithium cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 5 g of aluminum isopropoxide powder was dissolved in 95 g of ethanol to prepare a 5% aluminum isopropoxide solution (solution preparation step).

[0057] The aluminum isopropoxide solution and 50 g LiCoO 2 The powder was placed in a mixer with a jacketed heat exchanger and mixed well for about 10 minutes. Next, nitrogen gas was injected into the mixer while maintaining the temperature of the mixer chamber at 60° C. by circulating hot water through the heat exchanger. Stirring of the mixture was continued for an additional 30 minutes while a continuous stream of dry nitrogen was injected to evaporate the ethanol. The resulting dry powder was uniformly coated with the aluminum intermediate compound (one-step process).

[0058] The fine powder was heat-treated at 600°C under flowing air (heat treatment process). The heat-treated powders were sieved to collect powders of appropriate size as positive electrode active materials.

Embodiment 2

[0060] The same method as in Example 1 was used to prepare the positive electrode active material, except that 3 g of aluminum isopropoxide powder was dissolved in 97 g of ethanol to prepare a 3% aluminum isopropoxide solution.

Embodiment 3

[0062] The same method as in Example 1 was used to prepare a positive electrode active material, except that 1 gram of aluminum isopropoxide powder was dissolved in 99 grams of ethanol to prepare a 1% aluminum isopropoxide solution.

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Abstract

A method of preparing for a positive active material for a rechargeable lithium battery is provided. In this method, a lithiated compound to be coated and an organic solution or aqueous solution including a coating-element source are putted into a mixer, the mixture is continuously stirred to mix the contents thoroughly, and a hot dry gas is introduced into the mixer to evaporate the solvent while the powder is continuously agitated. The resulting dry coated powdery compound is heat-treated at an elevated temperature to obtain an oxide coating on the lithiated compound.

Description

[0001] CROSS REFERENCE TO THIS APPLICATION [0002] This application is based on Korean Patent Applications No. 2000-56247 and No. 2001-35727 filed with the Korean Industrial Property Office on September 25, 2000 and June 26, 2001, the contents of which are cited as References for this application. field of invention [0003] The invention relates to a method for preparing positive electrode active materials for rechargeable lithium batteries, in particular to an economical, feasible and simple process for preparing positive electrode active materials for rechargeable lithium batteries. Background of the invention [0004] Rechargeable lithium batteries use materials that can release or intercalate lithium ions as active materials for the positive and negative electrodes. Use organic solvents or polymers as electrolytes. Rechargeable lithium batteries generate electricity because of changes in the chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M4/02H01M4/04H01M4/131H01M4/36H01M4/505H01M4/525H01M4/58H01M10/05
CPCH01M4/505H01M4/04H01M2004/028H01M4/0402H01M4/525H01M4/0404H01M4/0416H01M4/131H01M4/043H01M4/0471Y02E60/122Y02E60/10
Inventor 权镐真徐晙源丁元一朴晸浚
Owner SAMSUNG SDI CO LTD
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