Reactor for preparing precursor of lithium composite transition metal oxide and method for preparing precursor

Inactive Publication Date: 2014-08-21
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0061]As apparent from the afore-going, the reactor of the present invention is effective in reducing retention time and providing uniform precursor particles having a small size.
[0062]Also, the preparation method according to the present invention provides precursor particles having a low impurity content and high crystallinity.
[0063]As a result, the precursor particles prepared by the preparation method according to the present invention is effective in improving

Problems solved by technology

However, cobalt used for LiCoO2 is a metal, so-called “rare metal”, which is low in deposits and are produced in limited areas, thus having an unstable supply.
Also, LiCoO2 is disadvantageously expensive due to unstable supply of cobalt and increased demand of lithium secondary batteries.
The lithium composite transition metal oxide exhibits superior electrochemical properties through combination of high capacity of lithium nickel oxide (LiNiO2), thermal stability and low price of manganese in layered-structure lithium manganese oxide (LiMnO2), and stable electrochemical properties of LiCoO2, but is not easy to synthesize through a simple solid reaction.
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Method used

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  • Reactor for preparing precursor of lithium composite transition metal oxide and method for preparing precursor
  • Reactor for preparing precursor of lithium composite transition metal oxide and method for preparing precursor
  • Reactor for preparing precursor of lithium composite transition metal oxide and method for preparing precursor

Examples

Experimental program
Comparison scheme
Effect test

Example

Example 1

[0086]Nickel sulfate, cobalt sulfate and manganese sulfate were mixed at a ratio (molar ratio) of 0.50:0.20:0.30, a 1.5M aqueous transition metal solution was prepared and a 3M aqueous sodium hydroxide solution was then prepared. As the ammonia solution, an aqueous solution in which ammonium ions are dissolved at 25 wt % was prepared.

[0087]The prepared aqueous transition metal solution was injected into the reactor using the metering pump for a retention time of one hour. The aqueous sodium hydroxide solution was variably injected using a metering pump such that pH is maintained at 11.0. The aqueous ammonia solution was continuously supplied at a concentration of 30 mol %, based on the aqueous transition metal solution.

[0088]The mean retention time was one hour, the reaction was continued for 20 hours after reached in a normal state, and the resulting nickel-cobalt-manganese composite transition metal precursor was washed with distilled water several times, and dried in a 1...

Example

Example 2

[0089]A nickel-cobalt-manganese composite transition metal precursor was prepared in the same manner as in Example 1, except that supply amounts were changed so as to adjust the retention time to 2 hours.

Example

Example 3

[0090]A nickel-cobalt-manganese composite transition metal precursor was prepared in the same manner as in Example 1, except that supply amounts were changed so as to adjust the retention time to 3 hours.

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Abstract

Disclosed is a reactor for preparing a precursor of lithium composite transition metal oxide for lithium secondary batteries, the reactor having a closed structure including a stationary hollow cylinder; a rotary cylinder having the same axis as the stationary hollow cylinder and an outer diameter smaller than an inner diameter of the stationary hollow cylinder, an electric motor to generate power, enabling rotation of the rotary cylinder, a rotation reaction area disposed between the stationary hollow cylinder and the rotary cylinder, wherein ring-shaped vortex pairs that are uniformly arranged in a rotation axis direction and rotate in opposite directions are formed in the rotation reaction area, and an inlet through which a reactant fluid is fed into the rotation reaction area and an outlet through which the reactant fluid is discharged from the rotation reaction area.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of International Application No. PCT / KR2012 / 007058, filed Sep. 4, 2012, which claims the benefit of Korean Patent Application No. 10-2012-0010134, filed Feb. 1, 2012, the disclosures of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to a reactor for preparing a precursor of lithium composite transition metal oxide and a method for preparing the precursor.BACKGROUND ART[0003]Technological development and increased demand for mobile equipment have led to a rapid increase in the demand for secondary batteries as energy sources. Among these secondary batteries, lithium secondary batteries having high energy density and voltage, long lifespan and low self-discharge are commercially available and widely used.[0004]Among components of lithium secondary batteries, a cathode active material has an important role in determining capacity and performance of batteries.[0...

Claims

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Application Information

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IPC IPC(8): B01J19/28C01G53/04
CPCB01J19/28C01G53/04B01J19/18C01G45/1221C01G51/42C01G53/006C01G53/42C01P2006/40H01M4/505H01M4/525H01M10/052Y02E60/122B01J4/001B01J19/1806B01J2204/002B01J2219/00074B01J2219/182B01J2219/1943Y02E60/10Y02P70/50C01D15/00H01M4/48
Inventor PARK, BYUNGCHUNKANG, SEONG HOONSHIN, HOSUKPARK, SANGMINPARK, HONG KYU
Owner LG CHEM LTD
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