Method for preparing transition metal composite oxide, transition metal composite oxide prepared thereby, and lithium composite oxide prepared using same

Patent metadata

Field	Value
Publication number	US-10629903-B2
Application number	US-201414909035-A
Country	US
Kind code	B2
Filing date	Jul 31, 2014
Priority date	Jul 31, 2013
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

The present invention relates to a method for preparing a lithium composite oxide and a lithium composite oxide prepared thereby and, more specifically, to: a method for preparing a lithium composite oxide, capable of preparing a lithium-ion secondary battery with high capacity by adjusting the amount of a basic solution added according to the nickel content during the preparation of a lithium composite oxide through a co-precipitation reaction, thereby adjusting the pH of the reactor, and thus improving the particle density and increasing the tap density, and a lithium composite oxide prepared thereby.

First claim

The invention claimed is:

1. A method for preparing a transition-metal composite oxide,
the method comprising:
forming a first aqueous metal-salt solution with nickel, manganese, and cobalt;
forming a second aqueous metal-salt solution with nickel, manganese, and cobalt;
mixing a basic solution and an ammonia solution in a reactor to adjust pH of the mixture comprising the basic solution and the ammonia solution to 11.8 through 12.3; and
supplying a first mixed aqueous metal-salt solution, which is formed of the first aqueous metal-salt solution and the second aqueous metal-salt solution, and the mixture into the reactor,
wherein the pH of the mixture is a first mixture pH or a second mixture pH which is higher than the first mixture pH, and an amount of nickel in the first aqueous metal-salt solution and the second aqueous metal-salt solution is a first nickel amount or a second nickel amount which is higher than the first nickel amount, and
wherein the second mixture pH is selected when the second nickel amount is selected and the first mixture pH is selected when the first nickel amount is selected.

2. The method of claim 1 ,
wherein said first aqueous metal-salt solution satisfies the molar equation x 1 +y 1 +z 1 =1 in which nickel content is x 1 , manganese content is y 1 , and cobalt content is z 1 ,
wherein said second aqueous metal-salt solution satisfies the molar equation x 2 +y 2 +z 2 =1 in which nickel content is x 2 , manganese content is y 2 , and cobalt content is z 2 , and
wherein at least one of x 1 ≠x 2 , y 1 ≠y 2 , and z 1 ≠z 2 .

3. The method of claim 2 , wherein the x 1 is equal to or higher than 0.8 and equal to or lower than 1.0.

4. The method of claim 2 , wherein the x 2 is equal to or lower than 0.8.

5. The method of claim 1 , wherein the supplying of the first mixed aqueous metal-salt solution comprises:
gradually changing the mixing ratio of the first aqueous metal-salt solution and the second aqueous metal-salt solution toward 1 v %: 100 v % from 100 v %: 0 v %.

6. The method of claim 1 , further comprising:
forming a third aqueous metal-salt solution with nickel, manganese, and cobalt; and
supplying a second mixed aqueous metal-salt solution, which is formed of the first mixed aqueous metal-salt solution and the third aqueous metal-salt solution, and the mixture into the reactor.

7. The method of claim 6 ,
wherein said third aqueous metal-salt solution satisfies the molar equation x 4 +y 4 +z 4 =1 in which nickel content is x 4 , manganese content is y 4 , and cobalt content is z 4 in the third aqueous metal-salt solution,
wherein said first mixed aqueous metal-salt solution satisfies the molar equation x 3 +y 3 +z 3 =1 in which nickel content is x 3 , manganese content is y 3 , and cobalt content is z 3 , and
wherein at least one of x 3 ≠x 4 , y 3 ≠y 4 , and z 3 ≠z 4 .

8. The method of claim 6 , wherein the supplying of the second mixed aqueous metal-salt solution comprises:
gradually changing the mixing ratio of the first mixed aqueous metal-salt solution and the third aqueous metal-salt solution toward 1 v %: 100 v % from 100 v %: 0 v %.

Assignees

• Iucf Hyu

Inventors

• Sun Yang-Kook
• Youn Sung-June

Classifications

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2004/53

  bimodal size distribution · CPC title

• H01M4/50

  of manganese · CPC title

• H01M10/052

  Li-accumulators · CPC title