Precursor of positive electrode active material for secondary battery and positive electrode active material prepared using the same

Patent metadata

Field	Value
Publication number	US-10700352-B2
Application number	US-201716070049-A
Country	US
Kind code	B2
Filing date	Mar 3, 2017
Priority date	Mar 4, 2016
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

The present disclosure relates to a precursor of a positive electrode active material for a secondary battery including a single layer-structured secondary particle in which pillar-shaped primary particles radially oriented in a surface direction from the particle center are aggregated, wherein the secondary particle has a shell shape, and the primary particle includes a composite metal hydroxide of Ni—Co—Mn of the following Chemical Formula 1, and a positive electrode active material prepared using the same:

Ni 1−(x+y+z) Co x M y Mn z (OH) 2   [Chemical Formula 1]

In Chemical Formula 1, M, x, y and z have the same definitions as in the specification.

First claim

What is claimed is:

1. A precursor of a positive electrode active material for a secondary battery, comprising:
a secondary particle having a single layer structure, wherein the single layer structure is an aggregate of pillar-shaped primary particles radially oriented in a surface direction from the particle center of the secondary particle,
wherein
the primary particle includes a composite metal hydroxide of Ni—Co—Mn of the following Chemical Formula 1:
Ni 1−(x+y+z) Co x M y Mn z (OH) 2   [Chemical Formula 1]

wherein, in Chemical Formula 1,
M includes any one, or two or more elements selected from the group consisting of Al, Zr, Mg, Zn, Y, Fe and Ti; and
x, y and z are each 0<x<1, 0≤y<1, 0<z<1 and 0<x+y+z<1, wherein the precursor is prepared by a method comprising:
introducing an ammonium cation-containing complex forming agent and a basic compound to a metal-containing solution to form a reaction solution, wherein a metal-containing solution includes a nickel raw material, a cobalt raw material and a manganese raw material; and
co-precipitation reacting the reaction solution under a pH of 10.50 to 12.00 and a temperature of 50° C. to 70° C.,
wherein the ammonium cation-containing complex forming agent is introduced at a rate of 0.5 times to 1.5 times with respect to an introduction rate of the metal-containing solution.

2. The precursor of a positive electrode active material for a secondary battery of claim 1 , wherein 0<x+y+z<0.5 in Chemical Formula 1.

3. The precursor of a positive electrode active material for a secondary battery of claim 1 , wherein the primary particle has a length ratio of 0.3 to 1 with respect to a radius of the secondary particle when considering a length of a major axis passing through the particle center as a length of the primary particle.

4. The precursor of a positive electrode active material for a secondary battery of claim 1 , wherein the primary particle has an average aspect ratio of 5 to 30 when considering a ratio of a length of a major axis, which is perpendicular to a minor axis passing through the particle center, with respect to a length of the minor axis as an aspect ratio.

5. The precursor of a positive electrode active material for a secondary battery of claim 1 , wherein the precursor has an average particle diameter (D 50 ) of 7 μm to 20 μm and a BET specific surface area of 5.0 m 2 /g to 30.0 m 2 /g.

6. The method for preparing the precursor of a positive electrode active material for a secondary battery of claim 1 , wherein the ammonium cation-containing complex forming agent and the basic compound are used in a molar ratio of 1:10 to 1:2.

7. A positive electrode active material for a secondary battery, comprising:
a secondary particle having a single layer structure,
wherein the single layer structure is an aggregate of pillar-shaped primary particles radially oriented in a surface direction from the particle center of the secondary particle,
wherein
the primary particle includes a lithium composite metal oxide of Ni—Co—Mn of the following Chemical Formula 2 and exhibits mono-modal-type particle distribution:
Li α [Ni 1-(x+y+z) CO x M y Mn z ]O 2   [Chemical Formula 2]

wherein, in Chemical Formula 2,
M includes any one, or two or more elements selected from the group consisting of Al, Zr, Mg, Zn, Y, Fe and Ti;
x, y and z are each 0<x<1, 0≤y<1, 0<z<1 and 0<x+y+z<1; and
a is 1.0≤a≤1.5.

8. The positive electrode active material for a secondary battery of claim 7 , wherein the positive electrode active material has an average particle diameter of 7 μm to 15 μm and a BET specific surface area of 0.1 m 2 /g to 1.0 m 2 /g.

9. The positive electrode active material for a secondary battery of claim 7 , which has tap density of 1.7 g/cc to 3.0 g/cc.

10. A positive electrode for a secondary battery comprising the positive electrode active material of claim 7 .

11. A lithium secondary battery comprising the positive electrode of claim 10 .

Assignees

• Lg Chemical Ltd

Inventors

• Jeong Myung Gi
• Woo Sang Won
• Cho Seung Beom
• Choi Sang Soon

Classifications

• C01G53/82 Primary

  Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• C01P2006/11

  Powder tap density · CPC title

• C01P2004/45

  Aggregated particles or particles with an intergrown morphology · CPC title