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

A positive electrode active material and secondary battery technology, applied in secondary batteries, battery electrodes, active material electrodes, etc., can solve the problems of crystal structure instability, surface stability degradation, service life reduction, etc., and achieve excellent structural stability Effect

Active Publication Date: 2020-05-01
LG ENERGY SOLUTION LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium cobalt oxide (LiCoO2) has the advantages of high operating voltage and excellent capacity characteristics, but its disadvantages are that its thermal characteristics deteriorate due to crystal structure instability caused by delithiation, and its structural become unstable at high voltage
In addition, the oxidation number of Co increases to 4+ due to oxidation during charging, and lithium cobalt oxide (LiCoO2) has a deteriorated surface stability and a reduced service life due to side reactions with the electrolyte The problem

Method used

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

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preparation example Construction

[0042]

[0043] Next, by doping Co with the doping element M in an amount of 1,000 ppm or more 3 o 4 Or the CoOOH precursor is mixed with the lithium raw material, and the first heat treatment is performed to prepare the lithium cobalt oxide.

[0044] As the lithium raw material, lithium-containing sulfate, lithium-containing nitrate, lithium-containing acetate, lithium-containing carbonate, lithium-containing oxalate, lithium-containing citrate, lithium-containing halide, lithium-containing hydroxide can be used , lithium-containing oxyhydroxide, etc., and the lithium raw material is not particularly limited as long as it can be dissolved in water. Specifically, the lithium raw material can be Li 2 CO 3 、LiNO 3 、LiNO 2 , LiOH, LiOH·H 2 O, LiH, LiF, LiCl, LiBr, LiI, CH 3 COOLi, Li 2 O. Li 2 SO 4 、CH 3 COOLi, Li 3 C 6 h 5 o 7 etc., and any one of the above materials or a mixture of two or more thereof may be used.

[0045] In addition, the amount of the lithi...

Embodiment 1

[0105] In a 5 L batch reactor set at 60 °C, the CoSO 4 mixed in water, and further compared to CoSO 4 Al mixed in an amount of 0.3% by weight 2 (SO 4 ) 3 , to prepare a precursor-forming solution at a concentration of 2M. Connect the vessel containing the precursor-forming solution to load it into the reactor, and additionally prepare 25% aqueous NaOH and 15% NH 4 OH aqueous solution and connect it to the reactor. Add 1 L of deionized water into the co-precipitation reactor (capacity of 5 L), then purge nitrogen into the reactor at a rate of 2 L / min to remove dissolved oxygen in the water, and set the interior of the reactor to non-oxidizing atmosphere. Thereafter, 10 ml of a 25% aqueous NaOH solution was added, and the mixture was stirred at a temperature of 60° C. at a stirring speed of 1,200 rpm so as to maintain a pH of 12.0. Then, the precursor forming solution was added at 4 ml / min, the NaOH aqueous solution was added at 1 ml / min, and the NH 4 OH aqueous solution...

Embodiment 2

[0109] In addition to using MgSO in precursor doping 4 instead of Al 2 (SO 4 ) 3 Preparation of 4,000 ppm Mg-doped Co as doping raw material 3 o 4 Precursor, using 0.3 parts by weight of MgO instead of Al(OH) in the second heat treatment 3, and performing a second heat treatment at 850° C. for about 5 hours to prepare a positive active material whose surface is additionally doped with Mg, the positive active material was prepared in the same manner as in Example 1.

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Abstract

The present invention provides a cathode active material for a secondary battery, the cathode active material being a lithium cobalt-based oxide comprising doping element M, wherein particles of the lithium cobalt-based oxide contain the doping element M in an amount of 3,000 ppm or higher wherein the doping element M is uniform in concentration across a bulk portion covering the core side corresponding to 90 % of the radius from the core to the surface in the particle and present in a surficial portion at a concentration identical to or higher than in the bulk portion and has a concentrationgradient gradually decreasing from the surface of the particle in the core direction, the surficial portion covering a depth of 100 nm from the surface of the particle in the core direction.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2017-0120659 filed with the Korean Intellectual Property Office on September 19, 2017, 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 for a secondary battery, a preparation method thereof, and a lithium secondary battery comprising the same Background technique [0004] In recent years, with the rapid development of electronic devices using batteries, such as mobile phones, notebook computers, and electric vehicles, the demand for secondary batteries that are small in size, light in weight, and relatively high in capacity is rapidly increasing. In particular, lithium secondary batteries are light in weight and have high energy density, so that they are attracting attention as driving power sources for porta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/485H01M4/36C01G51/00H01M10/052
CPCH01M4/36H01M4/485H01M4/525H01M10/052C01G51/00Y02E60/10C01G51/42C01P2002/52C01P2002/54C01P2006/40H01M4/366H01M4/0459H01M4/131H01M4/364H01M10/0525H01M10/0569H01M2004/021H01M2004/027H01M2004/028H01M2220/20
Inventor 赵治皓柳玟圭朴星彬许赫黃进泰郑王谟
Owner LG ENERGY SOLUTION LTD
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