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Positive active material for lithium secondary battery and method of preparing the same

A technology for positive electrode active materials and lithium secondary batteries, which is applied in secondary battery manufacturing, secondary battery, electrode manufacturing, etc., and can solve the problems of failure to overcome the degradation of cycle life characteristics under high temperature, and failure to overcome capacitance reduction.

Inactive Publication Date: 2003-11-26
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a method of coating using an ion-conducting lithium amorphous compound is also known, the above-mentioned method neither overcomes the problem of reduction in capacitance nor the problem of deterioration of cycle life characteristics at high temperature

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (Preparation of core particles)

[0066] Will Li 2 CO 3 And MnO 2 The spinel lithium manganese composite powder was prepared after mixing with the molar ratio of Li and Mn as 0.538. After the above materials are uniformly mixed, they are heat-treated at 480°C for 10 hours in the air, then the material is cooled to accelerate the reaction, and then heat-treated at 750°C for 20 hours in the air to obtain spinel powder. The air flow rate in the heat treatment process is 0.1 l / Gh. The composition of the lithium manganese compound prepared by the above procedure is Li 1.05 Mn 1.95 O 4 .

[0067] (Preparation of outer layer material)

[0068] LiCH 3 COO is used to provide lithium as the outer layer material, Ni(CH 3 COO) 2 Used to provide Ni, and Co(CH 3 COO) 2 Used to provide Co. The homogeneous composite solution of the lithium-nickel metal composite compound is prepared by stirring the absolute ethanol solution in which...

Embodiment 2

[0083] The preparation and testing of the positive electrode and the test battery were performed in the same method as in Example 1, except that the molar ratio of Ni and Co of the outer layer composition was 4:6.

Embodiment 3

[0085] The preparation and testing of the positive electrode and the test battery were carried out in the same way as in Example 1, except that the outer layer composition was LiNi 0.7 V 0.3 O 2 outer.

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Abstract

Disclosed is a positive active material for a lithium secondary battery and a preparation method of the same, in particular a positive active material and preparation method of the same that can improve cycle-life characteristics at a high temperature and room temperature, and storage characteristics at a high temperature.The present invention has the effect of providing a positive active material and preparation method of the same that can improve cycle-life characteristics at room temperature and at a high temperature, and storage characteristics at a high temperature, by coating the surface of the lithium manganese spinel oxide particles with a lithium metal complex oxide.

Description

Technical field [0001] The present invention relates to a positive electrode active material for lithium secondary batteries and a preparation method thereof, and more specifically to a positive electrode capable of improving the cycle life characteristics at room temperature and high temperature and the storage characteristics at high temperature of lithium or lithium ion batteries Active material and its preparation method. Background technique [0002] This application is based on the application No. 2001-12827 filed to the Korean Industrial Property Office on March 13, 2001, and the content of the application is incorporated into this application for reference. [0003] Lithium secondary batteries need to have good cycle life characteristics, safety characteristics, and storage characteristics at high temperatures. An important factor that affects the cycle life characteristics of the battery is the characteristics of the positive electrode and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/00H01M4/02H01M4/131H01M4/1391H01M4/36H01M4/505H01M4/525H01M10/05
CPCH01M4/1391H01M4/525H01M4/366H01M4/505H01M4/131Y02E60/122Y02E60/10Y02P70/50H01M4/48H01M4/04H01M10/0525
Inventor 朴洪奎朴盛镛权容薰裵峻晟李琪永金陈温
Owner LG ENERGY SOLUTION LTD
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