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

A positive electrode active material and secondary battery technology, applied in the direction of secondary batteries, battery electrodes, active material electrodes, etc., can solve the problems of particle growth inhibition and achieve the effect of particle growth inhibition

Pending Publication Date: 2019-09-10
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] One aspect of the present invention provides an average particle diameter of 15 μm or more by doping with an excessive doping element to have structural stability even at high voltage while solving the problem of particle growth inhibition by the doping element. (D 50 ) positive electrode active material of lithium cobalt oxide with large particle size

Method used

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

Examples

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preparation example Construction

[0034] In the preparation of the precursor, first, a precursor-forming solution containing a cobalt-containing starting material and a dopant element source is prepared.

[0035] As the cobalt-containing starting material, cobalt-containing sulfates, halides, acetates, sulfides, hydroxides, oxides, or oxyhydroxides can be used, and these materials are not particularly limited as long as they can be dissolved in water That's it. For example, cobalt-containing starting materials can include Co(SO 4 ) 2 ·7H 2 O, CoCl 2 、Co(OH) 2 、Co(OCOCH 3 ) 2 4H 2 O or Co(NO 3 ) 2 ·6H 2 O, and any one of the above materials or a mixture of two or more thereof may be used.

[0036] The doping element source may include doping element-containing sulfate, nitrate, acetate, halide, hydroxide, or oxyhydroxide, and any one of the above materials or a mixture of two or more thereof may be used. The doping element may be at least one selected from the group consisting of Al, Ti, Mn, Zr, Mg,...

Embodiment 1

[0095] The preparation of embodiment 1-positive electrode active material precursor

[0096] In a 5L batch reactor set at 60 °C, CoSO 4 mixed in water and based on CoSO 4 , further mixed with Al(OH) in an amount of 0.5% by weight 3 , to prepare a precursor-forming solution at a concentration of 2 M. Connect the vessel containing the precursor-forming solution to the reactor, and additionally, prepare 25 wt% aqueous NaOH and 15 wt% NH 4 OH aqueous solution and connect them to the reactor. 1 L of deionized water was put into a co-precipitation reactor (capacity of 5 L), and then the reactor was purged with nitrogen gas at a rate of 2 L / min to remove dissolved oxygen in the water and form a non-oxidizing atmosphere in the reactor. Thereafter, 10 ml of a 25% by weight NaOH aqueous solution was added, followed by stirring at a speed of 1200 rpm at a temperature of 60° C. to keep the pH at 12.0. Subsequently, the precursor forming solution, NaOH aqueous solution and NH 4 OH ...

Embodiment 2

[0097] Embodiment 2-Preparation of positive electrode active material precursor

[0098] Except during the doping of precursors based on CoSO 4 Al(OH) was mixed in an amount of 0.3% by weight 3 And a co-precipitation reaction was performed for 12 h to prepare Co doped with 3,000 ppm Al 3 o 4 A cathode active material precursor was prepared in the same manner as in Example 1 except for the precursor (about 15 μm).

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Abstract

The present invention provides: a cathode active material precursor for a secondary battery, comprising a primary particle of Co3O4 or CoOOH, wherein the primary particle contains 3000 ppm or more ofa doping element, and the average particle diameter (D50) of the primary particle is 15 [mu]m or more; and a cathode active material for a secondary battery, comprising a primary particle of a lithiumcobalt-based oxide, wherein the primary particle contains 2500 ppm or more of a doping element, and the average particle diameter (D50) of the primary particle is 15 [mu]m or more.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Applications No. 10-2017-0120645 filed on September 19, 2017 and No. 10-2018-0111642 filed on September 18, 2018 at the Korean Intellectual Property Office, the disclosures of which are incorporated by reference incorporated herein in its entirety. technical field [0003] The present invention relates to a positive electrode active material precursor for a secondary battery, a positive electrode active material and a lithium secondary battery containing the same. 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 having a relatively high capacity and being small in size and light in weight has rapidly increased. In particular, lithium secondary batteries have attracted attention as driving power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04C01G51/00H01M4/525H01M4/485H01M10/052
CPCC01G51/00C01G51/04H01M4/485H01M4/525H01M10/052C01G51/42C01P2002/54C01P2006/40C01P2004/61Y02E60/10C01P2002/52C01P2004/84C01P2004/03H01M4/366H01M10/0525H01M2004/021H01M2004/028
Inventor 柳玟圭赵治皓朴星彬许赫黃进泰郑王谟
Owner LG ENERGY SOLUTION LTD