Method for Preparing Positive Electrode Active Material for Lithium Secondary Battery, Positive Electrode Active Material for Lithium Secondary Battery, and Lithium Secondary Battery Including Same

Inactive Publication Date: 2014-07-31
L & F
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0045]According to an embodiment of the present invention, there can be obtained a positive electrode active material h

Problems solved by technology

However, these materials have a drawback in that the capacity is small.
However, LiCoO2 is not priced competitively since it is expensive and thus accounts for 30% or more of the battery price.
LiNiO2 is difficult to synthesize even though it provides the highest charge capacity in the above-mentioned positive electrode active materials.
Moreover, the self discharge of nickel is severe and reversi

Method used

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  • Method for Preparing Positive Electrode Active Material for Lithium Secondary Battery, Positive Electrode Active Material for Lithium Secondary Battery, and Lithium Secondary Battery Including Same
  • Method for Preparing Positive Electrode Active Material for Lithium Secondary Battery, Positive Electrode Active Material for Lithium Secondary Battery, and Lithium Secondary Battery Including Same
  • Method for Preparing Positive Electrode Active Material for Lithium Secondary Battery, Positive Electrode Active Material for Lithium Secondary Battery, and Lithium Secondary Battery Including Same

Examples

Experimental program
Comparison scheme
Effect test

Example

Synthetic Example 1

Preparation of Lithium Composite Oxide

[0124]Li2CO3 (Product name: SQM) and Ni0.47Co0.20Mn0.33(OH)2(D50: 5 μm) were mixed at a weight ratio of 1:1.03 (Metal:Li) using a mixer. The obtained mixture was fired for a total of 20 hours while the time rise reaction time was 6 hours in air and the time for a maintenance period was 7 hours at 950° C., thereby preparing a fired material.

[0125]The obtained fired material was slowly cooled and then reduced to powder, thereby obtaining a lithium composite oxide powder for mixing and firing according to an embodiment of the present invention.

Example 1

Preparation of Positive Electrode Active Material Through Mixing and Firing

[0126]Li2CO3 (Product name: SQM) and Ni0.55Co0.20Mn0.25(OH)2 were mixed at a weight ratio of 1:1.03 (Metal:Li) using a mixer.

[0127]After the final firing, LiNi0.47Co0.20Mn0.33O2 was further added thereto such that the weight ratio of LiNi0.55Co0.20Mn0.25O2 and Li0.47Co0.20Mn0.33O2 of Synthetic Example 1 was ...

Example

Example 2

Preparation of Positive Electrode Active Material Through Mixing and Firing

[0130]A positive electrode active material was prepared by the same method as in Example 1, except that LiNi0.47CO0.20Mn0.33O2 was added such that the weight ratio of LiNi0.55CO0.20Mn0.25O2 and LiNi0.47CO0.20Mn0.33O2 was 80:20, followed by mixing and firing.

Example

Example 3

Preparation of Positive Electrode Active Material Through Mixing and Firing

[0131]A positive electrode active material was prepared by the same method as in Example 1, except that LiNi0.47CO0.20Mn0.33O2 was added such that the weight ratio of LiNi0.55CO0.20Mn0.25O2 and LiNi0.47CO0.20Mn0.33O2 was 70:30, followed by mixing and firing.

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Abstract

Disclosed are a method for preparing a positive electrode active material for a lithium secondary battery and a positive electrode active material for a lithium secondary battery, the method including: preparing a mixture of a precursor represented by Chemical Formula 1 below, a lithium composite oxide represented by Chemical Formula 2 below and capable of intercalating/deintercalating lithium ions, and a lithium feed material; and firing the prepared mixture:
A(OH)2-a  [Chemical Formula 1]
Li[LizA(1-z-a)Da]EbO2-b  [Chemical Formula 2]

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to and the benefit of Korean Patent Application No. 10-2012-0025695, and PCT / KR2012 / 002286 filed in the Korean Intellectual Property Office on Mar. 13, 2012, and Mar. 28, 2012, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002](a) Field of the Invention[0003]The present invention relates to a method for preparing a positive electrode active material for a lithium secondary battery, a positive electrode active material for a lithium secondary battery, and a lithium secondary battery including the same.[0004](b) Description of the Related Art[0005]Recently, with respect to the trend of miniaturization and lightweight of portable electronic devices, the batteries used as power for the devices need to be have high performance and high capacity.[0006]Batteries generate electric power by using materials capable of having an electrochemical reaction at positive and ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/04H01M4/525C01D15/02H01M4/505
CPCH01M4/5825C01D15/02H01M4/0471H01M4/525H01M4/505C01G53/50C01P2002/52C01P2004/61C01P2004/80C01P2004/84C01P2006/40H01M10/052Y02E60/10Y02E60/50H01M4/1391H01M4/131H01M4/485H01M8/04H01M10/0525H01M2004/028Y02P70/50
Inventor CHOI, SU ANLEE, SEUNG-WONJEON, SANG-HOON
Owner L & F
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