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Cathode active material precursor for secondary battery, cathode active material, preparation method therefor, and lithium secondary battery comprising same

A cathode active material, secondary battery technology, used in secondary batteries, battery electrodes, lithium batteries, etc., can solve the problems of low electrochemical performance and density, low ionic conductivity, and reduced strength, and achieve high capacity, high Effects of density, high rate capability

Active Publication Date: 2021-10-01
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

About the hydroxide precursor Ni 1-α1-β1 co α1 mn β1 (OH) 2 (0<α1<1.0, 0<β1<1.0), because the primary particle has a relatively large diameter of about 1 μm to about 3 μm and is not dense, so it is disadvantageous in that the ion conductivity is low and the electrochemical performance and density are low
For the carbonate precursor Ni 1-α2-β2 co α2 mn β2 CO 3 (0

Method used

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  • Cathode active material precursor for secondary battery, cathode active material, preparation method therefor, and lithium secondary battery comprising same
  • Cathode active material precursor for secondary battery, cathode active material, preparation method therefor, and lithium secondary battery comprising same
  • Cathode active material precursor for secondary battery, cathode active material, preparation method therefor, and lithium secondary battery comprising same

Examples

Experimental program
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Effect test

Embodiment 1

[0094] After putting 4 L of distilled water into a co-precipitation reactor (capacity 20 L), and then adding 100 ml of 28% by weight ammonia solution to the reactor while maintaining the temperature at 50° C., at 300 ml / hr and 42 ml / hr, respectively, Concentration is the solution containing transition metal cation of 3.2mol / L and the aqueous ammonia solution of 28% by weight to the reactor continuously at the rate of adding, in the solution containing transition metal cation so that nickel: cobalt: the mol ratio of manganese is 2:2:6 mixed with NiSO 4 、CoSO 4 and MnSO 4 . Stirring was performed at an impeller speed of 400 rpm, and in order to maintain the pH, 40% by weight sodium hydroxide solution was added to maintain the pH at 9.5.

[0095] In this case, oxygen (O 2 ) while co-precipitating for 24 hours to form 0.4(Ni 0.5 co 0.5 (OH) 2 )·0.6(MnO 2 ) precursor particles. The precursor particles were separated, washed, and then dried in an oven at 130° C. to prepare ...

experiment example 1

[0100] [Experimental Example 1: Precursor Particle Confirmation]

[0101] The cathode active material precursors prepared in Example 1 and Comparative Examples 1 and 2 were confirmed by using X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). show the result in Figure 1 to Figure 4 middle. Specifically, in XPS analysis, by using ESCALAB 250 (Thermo Fisher Scientific) equipment obtained measurement scanning spectrum and narrow scanning spectrum, carried out XPS test, and in XRD analysis, using Cu target under the acceleration voltage of 40kV and the acceleration current of 40mA in the range of 10 ° ~ 90 ° per minute XRD measurements were performed at a rate of 3° using D4 ENDEAVOR (Bruker AXS GmbH) equipment.

[0102] refer to figure 1 and figure 2 (XPS of embodiment 1( figure 1 ) and reference data ( figure 2 )), the oxidation number of Mn can be known from the energy difference of the two peaks separated in the XPS spectrum of Mn 3s, where, from ...

experiment example 2

[0105] [Experimental Example 2: Measurement of Tap Density]

[0106] By putting 50 g of various cathode active material precursors prepared in Example 1 and Comparative Examples 1 and 2 into a 50 ml graduated cylinder, and performing 1250 vibrations using a STAV-2 tap density meter (J. Engelsmann AG), the measured Tapped density. The results are shown in Table 1 below.

[0107] [Table 1]

[0108] Example 1 Comparative example 1 Comparative example 2 Tap density(g / cc) 1.55 1.24 1.37

[0109] Referring to Table 1, it can be confirmed that the tap density of the positive active material precursor of Example 1 is significantly higher than that of the positive active material precursors of Comparative Examples 1 and 2 in the form of hydroxide / carbonate, respectively.

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Abstract

The present invention provides a method for preparing a cathode active material precursor for a secondary battery, comprising the steps of: continuously injecting, into a reactor, a solution containing transition metal cations of nickel (Ni), cobalt (Co) and manganese (Mn), an alkali solution, and a solution containing ammonium ions; and performing coprecipitation while injecting no gases or continuously injecting an oxygen-containing gas into the reactor, thereby forming a cathode active material precursor in which nickel (Ni) and cobalt (Co) are in an unoxidized hydroxide form and manganese (Mn) is in an oxidized form. In addition, the present invention provides a cathode active material precursor for a secondary battery, comprising nickel (Ni), cobalt (Co) and manganese (Mn), wherein nickel (Ni) and cobalt (Co) are in an unoxidized hydroxide form and manganese (Mn) is in an oxidized form.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2019-0024312 filed on February 28, 2019, the disclosure of which is incorporated herein by reference. technical field [0003] The invention relates to a positive electrode active material precursor for a secondary battery, a positive electrode active material, a method for preparing the positive electrode active material precursor and the positive electrode active material, and a lithium secondary battery containing the positive electrode active material. Background technique [0004] Recently, with the rapid spread of electronic devices using batteries, such as mobile phones, notebook computers, and electric vehicles, the demand for secondary batteries that are relatively high in capacity and small in size and light in weight has increased dramatically. In particular, since lithium secondary batteries are light in weight and hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/525H01M10/052
CPCH01M4/525Y02E60/10C01P2002/85C01P2002/72C01P2004/03C01G53/006C01P2004/50C01P2004/62C01P2004/64C01P2006/11C01G53/44H01M4/505H01M10/052C01P2004/45C01P2006/40H01M10/0525
Inventor 李旼俊李峻远田仁局
Owner LG CHEM LTD
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