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Positive electrode active material particles each comprising core containing lithium cobalt oxide and shell containing lithium cobalt phosphate and method for manufacturing same

A cathode active material, lithium cobalt oxide technology, applied in the field of cathode active material particles and their preparation, can solve the problems of secondary battery performance deterioration, hindering Li ion movement, structural instability, etc., achieving excellent ion conductivity, inhibiting Oxygen release phenomenon, effect of improving battery safety

Active Publication Date: 2019-03-01
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] When a high voltage is applied to lithium cobalt oxide in order to achieve a high capacity, more specifically, when a high voltage of 4.45 V or more is applied thereto, there are the following problems: LiCoO 2 The amount of Li used increases so that the surface becomes unstable, and gas is generated by side reactions with the electrolyte, resulting in reduced stability (such as swelling phenomenon, etc.), increased possibility of structural instability, and rapid decline in life characteristics
However, the coating composed of metal hinders the movement of Li ions during charge / discharge cycles, and thus, there is a problem that the performance of secondary batteries may deteriorate

Method used

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  • Positive electrode active material particles each comprising core containing lithium cobalt oxide and shell containing lithium cobalt phosphate and method for manufacturing same
  • Positive electrode active material particles each comprising core containing lithium cobalt oxide and shell containing lithium cobalt phosphate and method for manufacturing same
  • Positive electrode active material particles each comprising core containing lithium cobalt oxide and shell containing lithium cobalt phosphate and method for manufacturing same

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Embodiment 1

[0080] Prepared LiCoO in the particle state with particle size distribution in the range of 10 microns to 20 microns 2 . 50g of LiCoO in granular state 2 Mix and disperse 0.26g CH in 50ml 3 COOLi·2H 2 O, 0.96g (CH 3 COO) 3 Co 4H 2 O and 0.41g (NH 4 ) 2 HPO 4 Heat treatment was carried out by dissolving in deionized water at a weight ratio of 1 (source):30 (deionized water) and raising the temperature to 220° C. for 10 minutes and maintaining a pressure of 5 bar for 5 minutes , thereby preparing positive electrode active material particles, wherein a core and a shell having a core:shell weight ratio of 100:1 are formed, and lithium cobalt phosphate having a tetrahedral phase is coated on lithium cobalt oxide with a thickness of 10 nm to 100 nm on the surface.

Embodiment 2

[0082] Positive electrode active material particles were prepared in the same manner as in Example 2, except that a core and a shell were formed with a core:shell weight ratio of 100:3.

Embodiment 3

[0084] Positive electrode active material particles were prepared in the same manner as in Example 2, except that a core and a shell were formed with a core:shell weight ratio of 100:5.

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Abstract

The present invention provides positive electrode active material particles each comprising: a core containing a lithium cobalt oxide represented by chemical formula 1 below; and a shell positioned ona surface of the core and containing a lithium cobalt phosphate represented by chemical formula 2 below, wherein the shell has a tetrahedral phase: LiaCo<1-x>MxO<2-y>Ay (1), wherein M is at least oneof Ti, Mg, Zn, Si, Al, Zr, V, Mn, Nb, and Ni, A is oxygen-substituted halogen, 0.95 <= a <= 1.05, 0<= x<= 0.2, 0<= y<= 0.2, and 0<= x+y<= 0.2; and LibCoPO4 (2) wherein, 0<= b<= 1.

Description

technical field [0001] Cross References to Related Applications [0002] This application is based on and claims priority from Korean Patent Application No. 10-2016-0155956 filed on November 22, 2016, the disclosure of which is hereby incorporated by reference in its entirety. [0003] The invention relates to a positive electrode active material particle comprising a core containing lithium cobalt oxide and a shell containing lithium cobalt phosphate and a preparation method thereof. Background technique [0004] In recent years, with rising energy prices due to the depletion of fossil fuels and increasing concerns about environmental pollution, the demand for environmentally friendly alternative energy sources has become an indispensable factor for the future. For this reason, various power generation technologies such as nuclear power, solar power, wind power, tidal power, etc. have been continuously researched, and energy storage devices for more efficiently utilizing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M10/0567H01M10/0525C01G51/00
CPCH01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/366H01M4/525H01M4/5825H01M10/052H01M10/0567H01M2300/0025C01G51/42C01P2004/80C01B25/45C01P2006/40C01P2004/61Y02E60/10H01M10/0525Y02P70/50H01M4/1315H01M4/13915H01M4/364H01M2004/028
Inventor 朴英旭赵治皓李宝蓝朴星彬许赫郑王谟
Owner LG ENERGY SOLUTION LTD
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