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Cathode active material, method of preparing the cathode material, cathode, and lithium secondary battery including the same

A positive electrode active material and secondary particle technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as low mixing density, stability problems, and low capacity

Active Publication Date: 2015-01-14
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nickel-based lithium transition metal oxide materials have low mixing density and low capacity per monomer volume
Therefore, in lithium secondary batteries, nickel-based lithium transition metal oxides used in positive electrodes have low discharge capacity
In addition, when a lithium secondary battery is manufactured using a nickel-based lithium transition metal oxide material and operated at a high voltage, the stability of the lithium secondary battery may also be problematic

Method used

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  • Cathode active material, method of preparing the cathode material, cathode, and lithium secondary battery including the same
  • Cathode active material, method of preparing the cathode material, cathode, and lithium secondary battery including the same
  • Cathode active material, method of preparing the cathode material, cathode, and lithium secondary battery including the same

Examples

Experimental program
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Effect test

preparation Embodiment 1

[0141] Preparation Example 1: Preparation of Positive Active Material

[0142] NiSO as nickel precursor 4 , CoSO as cobalt precursor 4 and MnSO as manganese precursor 4 Mixed together in water at a molar ratio of 0.5:0.2:0.3 to prepare an aqueous NiCoMn(NCM) hydroxide precursor solution. While stirring the aqueous solution, an aqueous sodium hydroxide solution was slowly added thereto. The reaction mixture was then stirred for 5 hours, and NCM hydroxide (Ni 0.5 co 0.2 mn 0.3 (OH) 2 )precipitation. The resultant was filtered and then washed to obtain a precipitate. The precipitate was dried at a temperature of 80° C. in an air atmosphere to obtain Ni formed of small particles having an average particle diameter of 6 μm 0.5 co 0.2 mn 0.3 (OH) 2 powder.

[0143] will Ni 0.5 co 0.2 mn 0.3 (OH) 2 The powder was heat-treated at a temperature of 600° C. for 1 hour in an air atmosphere to remove moisture. Then, a nickel transition metal oxide formed in a shape that e...

preparation Embodiment 2

[0148] Preparation Example 2: Preparation of Positive Active Material

[0149] The positive active material was prepared in the same manner as in Preparation Example 1, except that the mixture was stirred for 9.5 hours to obtain Ni 0.5 co 0.2 mn 0.3 (OH) 2 , obtaining Ni formed from large particles with an average particle size of 15 μm 0.5 co 0.2 mn 0.3 (OH) 2 Powder instead of Ni formed of small particles with an average particle size of 6 μm 0.5 co 0.2 mn 0.3 (OH) 2 , and the secondary particles of the positive electrode active material are large particles having an average particle diameter of 15 μm instead of small particles having an average particle diameter of 6 μm.

preparation Embodiment 3

[0150] Preparation Example 3: Preparation of Positive Active Material

[0151] The positive electrode active materials of Preparation Examples 1 and 2 were mixed in a weight ratio of 20:80. Then, positive electrode active material Li formed by primary particles having an average particle diameter of 4 μm and secondary particles including small particles having an average particle diameter of 6 μm and large particles having an average particle diameter of 15 μm was obtained. 1.05 [Ni 0.5 co 0.2 mn 0.3 ]O 2 .

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Abstract

A cathode active material including at least two agglomerates of primary particles and a cathode and a lithium secondary battery containing the same are disclosed. In the cathode active material, a secondary particle includes a nickel-based lithium transition metal oxide, an average particle diameter of each primary particle is in a range from about 3 to about 5 µ m, and the at least one secondary particle comprises at least one selected from the group consisting of a first particle having an average particle diameter in the range from about 5 µm to about 8µm and a second particle having an average particle diameter in the range from about 10 µm to about 20 µm, and wherein a full width at half maximum of a (003) peak is in the range from about 0.120° to about 0.125° in an X-ray diffraction (XRD) spectrum analysis.

Description

[0001] related application [0002] This application claims the benefit of Korean Patent Application No. 10-2013-0079896 filed with the Korean Intellectual Property Office on Jul. 8, 2013, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to a positive electrode active material, a method for preparing the positive electrode active material, a positive electrode comprising the same, and a lithium secondary battery. Background technique [0004] With the trend towards compact and high-performance devices, the fabrication of lithium batteries that are small, lightweight and have high energy density has become important. The stability of lithium batteries at high capacity, high temperature and high voltage is an important concern, especially for applications in electric vehicles. [0005] A variety of positive active materials have been considered for making lithium batteries for those application...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCH01M4/505H01M4/523H01M4/525C01D15/02H01M10/0525H01M4/485H01M4/131H01M4/1391H01M4/134H01M4/1395Y02E60/10
Inventor 李泳勋李淳律N-R.朴金荣基崔益圭朴容彻崔鸿奎
Owner SAMSUNG SDI CO LTD
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