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Method for preparing cathode active material for lithium secondary battery, cathode active material prepared thereby, cathode comprising same for lithium secondary battery, and lithium secondary battery

A positive electrode active material, lithium secondary battery technology, applied in secondary batteries, battery electrodes, lithium batteries, etc., can solve the problems of reduced structural stability, structural stability and low capacity

Active Publication Date: 2019-09-20
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, for lithium nickel cobalt manganese oxide, the structural stability and capacity are low, and there is a limitation that the structural stability is further reduced especially when the amount of nickel is increased to improve capacity characteristics

Method used

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  • Method for preparing cathode active material for lithium secondary battery, cathode active material prepared thereby, cathode comprising same for lithium secondary battery, and lithium secondary battery
  • Method for preparing cathode active material for lithium secondary battery, cathode active material prepared thereby, cathode comprising same for lithium secondary battery, and lithium secondary battery

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preparation example Construction

[0033] The method for preparing positive electrode active material according to the present invention comprises: nickel-cobalt-manganese hydroxide precursor, lithium-containing raw material and by Li 1+x m 2 o 2+y Compounds represented by are mixed, wherein based on the total moles of transition metals, the nickel cobalt manganese hydroxide precursor contains nickel in an amount of 60 mol% or more; and calcining the mixture to prepare Li 1+x m 2 o 2+y Doped cathode active material.

[0034] In order to prepare the positive active material according to the present invention, a nickel cobalt manganese hydroxide precursor, a lithium-containing raw material, and a compound represented by Formula 2 are first mixed.

[0035] Based on the total moles of transition metals, the nickel cobalt manganese hydroxide precursor may contain nickel in an amount of 60 mol% or more, and the nickel cobalt manganese hydroxide precursor may specifically be Ni a1 co b1 mn c1 (OH) 2 (wherein 0...

Embodiment approach

[0085] Hereinafter, the present invention will be described in detail based on specific examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these example embodiments are provided so that this description will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Embodiment 1

[0088] will Ni 0.6 co 0.2 mn 0.2 (OH) 2 , Li 2 CO 3 and Li 2 ZrO 3 mixed at a ratio of 1:1.05:0.004 and calcined at 850 °C for 10 hours to prepare Li 1.05 Ni 0.6 co 0.2 mn 0.2 Zr 0.004 o 2 .

[0089] The prepared Li 2 ZrO 3The doped positive electrode active material, acetylene black conductive agent and polyvinylidene fluoride (PVDF) binder are mixed in N-methylpyrrolidone (NMP) solvent in a weight ratio of 96:2:2 to prepare the positive electrode. combination. A 10 μm-thick aluminum foil was coated with the composition for forming a positive electrode, dried, and then rolled to prepare a positive electrode.

[0090] Natural graphite, carbon black conductive agent, styrene-butadiene rubber and carboxymethyl cellulose (CMC) as the negative electrode active material were mixed in a weight ratio of 96.3:1:1.5:1.2, and then the mixture was added as solvent in distilled water to prepare the composition for forming the negative electrode. A 10 μm-thick copper foil...

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Abstract

The present invention relates to a method for preparing a cathode active material, comprising the steps of: blending a nickel cobalt manganese hydroxide precursor containing nickel in an amount of 60 % by mole or more on the basis of the total mole of the transition metals, a raw lithium material, and a compound represented by the following Chemical Formula 2 as a raw doping material; and calcining the blend to prepare a cathode active material represented by the following chemical formula 1, a cathode active material prepared by the method, a cathode comprising the same for a lithium secondary battery, and a lithium secondary battery: [chemical formula 1] Li1+x[NiaMe1-(a+b)M1 b]1-xO2 wherein 0<=x<=0.1, 0.6<=a<=0.9995, 0.0005<=b<=0.02, 0.6005<=a+b<1, Me is at least two selected from the group consisting of Co, Mn, and Al, and M1 is at least one selected from the group consisting of Li, Zr, Ti, Ta, Si, and Nb; and [chemical formula 2] Li1+x1M2O2+y wherein 0<=x1<=7, 1<=y<6, and M2 is at least one selected from the group consisting of Li, Zr, Ti, Ta, Si, and Nb.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 2017-0136889 filed with the Korean Intellectual Property Office on October 20, 2017, the disclosure of which is incorporated herein by reference in its entirety. technical field [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 prepared thereby, a positive electrode for a lithium secondary battery containing the positive electrode active material, and a lithium secondary battery containing the positive electrode. Background technique [0004] With the development of technology and the increase in demand for mobile devices, the demand for secondary batteries as energy sources has significantly increased. Among these secondary batteries, lithium secondary batteries having high energy density, high voltage, long cyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/525H01M4/505H01M4/485H01M10/052
CPCH01M4/485H01M4/505H01M4/525H01M10/052C01G53/50C01P2002/52Y02E60/10C01G53/44C01P2006/40C01P2002/50H01M4/0471H01M4/623H01M10/0525H01M2004/028
Inventor 朴成淳安东骏赵问圭
Owner LG CHEM LTD