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Cathode active material, method preparing same, cathode and lithium battery

A cathode active material and cathode technology, applied in the direction of active material electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of lithium manganese oxide cycle characteristics and stability degradation

Active Publication Date: 2012-07-18
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the cycle characteristics and stability of lithium manganese oxides formed at low temperatures may be reduced during high-temperature charge-discharge

Method used

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  • Cathode active material, method preparing same, cathode and lithium battery
  • Cathode active material, method preparing same, cathode and lithium battery
  • Cathode active material, method preparing same, cathode and lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0079] Example 1: Li 1.05 mn 1.85 Al 0.1 O 4 preparation of

[0080] Lithium carbonate (Li 2 CO 3 ), manganese dioxide (MnO 2 ), alumina (Al 2 o 3 ) and boric acid (H 3 BO 3 ) are used as raw materials.

[0081] In order to prepare 175.81mol of Li 1.05 mn 1.85 al 0.1 o 4 , mix lithium carbonate (Li 2 CO 3 ), manganese dioxide (MnO 2 ) and alumina (Al 2 o 3 ), and then boric acid was added thereto to prepare a mixture. Based on the total weight of the mixture, the content of boric acid in the mixture is 0.5wt%.

[0082] The above-mentioned raw materials were mixed in a mortar, and the mixture was heat-treated in a combustion furnace at a temperature of 800° C. for 20 hours while supplying dry air to the combustion furnace to prepare a cathode active material. The cathode active material is cooled in a combustion furnace. The average primary particle diameter of the cathode active material powder was 6 μm. The average primary particle diame...

Embodiment 2

[0084] Cathode active material primary particles were prepared in the same manner as in Example 1, except that the content of boric acid was 0.3 wt%. The primary particle of the cathode active material has a diameter of 1 μm.

Embodiment 3

[0086] Cathode active material primary particles were prepared in the same manner as in Example 1, except that the content of boric acid was 0.7 wt%. The diameter of the primary particle of the cathode active material is 8 μm.

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Abstract

A cathode active material including: a lithium manganese oxide of which primary particles has a diameter of 1um or more and which has a spinel structure in which an X to ray diffraction (XRD) peak intensity ratio of I (111) virgule I (311) is 1.0 or more; and a boron element disposed at least one position selected from the group consisting of inside the primary particles and on surfaces of the primary particles. The invention also discloses a cathode including the cathode active material, a lithium battery including the cathode, and a method of preparing the cathode active material.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2011-0003151 filed with the Korean Intellectual Property Office on Jan. 12, 2011, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] One or more embodiments relate to a cathode active material, a cathode including the cathode active material, a lithium battery including the cathode, and a method of preparing the cathode active material. Background technique [0004] Lithium transition metal oxides are used as cathode active materials for lithium batteries, and examples of such lithium transition metal oxides are LiNiO 2 、LiCoO 2 , LiMn 2 o 4 、LiFePO 4 、LiNi x co 1-x o 2 (0≤x≤1) and LiNi 1-x-y co x mn y o 2 (0≤x≤0.5, 0≤y≤0.5). [0005] Lithium cobalt oxides, such as LiCoO 2 Relatively expensive and has a limited capacity of about 140mAh / g. When paired with LiCoO 2 When the charging vo...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/131H01M10/0525
CPCH01M4/505H01M4/0471C01G51/12C01G45/1242C01G53/54H01M4/525Y02T10/7011H01M10/0525C01P2006/40C01P2004/03H01M4/485H01M4/1391C01P2006/12Y02E60/122H01M2004/028C01P2002/72H01M4/131H01M2004/021H01M4/364Y02E60/10H01M4/48Y02T10/70
Inventor 金珉周朴容撤许京宰李贤德宋美兰徐真亨柳螺凜
Owner SAMSUNG SDI CO LTD
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