Method of manufacturing cathode active material and cathode active material manufactured by the same

Patent metadata

Field	Value
Publication number	US-10230107-B2
Application number	US-201615513795-A
Country	US
Kind code	B2
Filing date	Dec 16, 2016
Priority date	Dec 31, 2015
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

Disclosed are a method of manufacturing a cathode active material and a cathode active material manufactured by the same, and more particularly, a cathode active material which is rinsed by a compound including thiol group, includes residual sulfur on a surface, and has decreased residual lithium and a method of manufacturing the same.

First claim

What is claimed is:

1. A method of manufacturing a cathode active material comprising:
preparing one selected from the group consisting of cathode active materials represented by Chemical Formula 1 and Chemical Formula 2:
Li x 1Ni1- y 1M1 y 1O2-αXα  [Chemical Formula 1]

Li x 1Ni1- y 2- z 2Co y 2M2 z 2O2-αXα  [Chemical Formula 2]

(wherein in Chemical Formula 1 and Chemical Formula 2, 0.9≤x1≤1.3, 0≤y1≤0.4, 0≤y2≤0.4, 0≤z2≤0.4, 0≤y2+z2≤0.4, and 0≤α≤2,
M1 and M2 are at least one selected from the group consisting of Al, Ni, Mn, Cr, Fe, Mg, Sr, V, Zn, W, Zr, B, Ba, Sc, Cu, Ti, Co, rare-earth elements, and a combination thereof,
X is at least one selected from the group consisting of O, F, S, and P
rinsing the cathode active material using a solution including a compound including thiol group; and
drying the rinsed cathode active material.

2. The method according to claim 1 , wherein rinsing the cathode active material using the solution including compound including thiol group comprises:
putting distilled water and the compound including thiol group into a reactor to prepare the solution including thiol group;
maintaining an inner temperature of the reactor at 5 to 50° C.; and
putting the cathode active material into the reactor and stirring.

3. The method according to claim 1 , wherein the compound including thiol group includes one selected from the group consisting of 2-thiazoline-2-thiol, 5-amino-1,3,4-thiadiazole-2-thiol, 1,3,4-thiadiazole-2,5-dithiol, 2,5-dimethylfuran-3-thiol, (1,2,4)thiadiazole-3,5-dithiol, 1-phenyl-1h-tetrazole-5-thiol, 4-methyl-4h-1,2,4-triazole-3-thiol, 5-methyl-1,3,4-thiadizole-2-thiol dithioglycol, s-triazine-2,4,6-trithiol, 7-methyl-2,6,8-trimercaptopurine, and 4,5-diamino-2,6-dimercaptopyrimidine.

4. The method according to claim 2 , wherein putting distilled water and the compound including thiol group into the reactor to prepare the solution including thiol group includes mixing 0.01 to 10 parts by weight of the compound including thiol group per 100 parts by weight of DIW.

5. The method according to claim 1 , wherein rinsing the cathode active material using the solution including compound including thiol group comprises:
depositing the cathode active material on a filter member; and
filtering the solution including thiol group through the filter member including the cathode active material to rinse the cathode active material.

6. The method according to claim 1 , wherein rinsing the cathode active material using the solution including compound including thiol group comprises:
putting distilled water and the compound including thiol group into a reactor to prepare the solution including thiol group;
maintaining an inner temperature of the reactor at 5 to 50° C.;
putting the cathode active material into the reactor and stirring;
depositing the rinsed cathode active material on a filter member; and
filtering the solution including thiol group through the filter member including the cathode active material to rinse the cathode active material.

7. The method according to claim 1 , wherein rinsing the cathode active material using the solution including compound including thiol group comprises:
depositing the rinsed cathode active material on a filter member;
filtering the solution including thiol group through the filter member including the cathode active material to rinse the cathode active material;
putting distilled water and the compound including thiol group into a reactor to prepare a solution including thiol group;
maintaining an inner temperature of the reactor at 5 to 50° C.; and
putting the cathode active material into the reactor and stirring.

8. The method according to claim 1 , wherein drying the rinsed cathode active material is performed at 50 to 400° C. for 1 to 20 hours.

9. The method according to claim 1 , wherein in at least some particles of the cathode active material, at least one selected from the group consisting of Ni, Co, M1 and M2 has concentration gradient.

10. The method according to claim 9 , wherein the area having concentration gradient occupies 80% or more of the entire particles area.

11. The method according to claim 9 , wherein the area having concentration gradient occupies 10 to 50% of the entire particles area.

Assignees

• Ecopro Bm Co Ltd

Inventors

• Noh Hyung Joo
• Jeon Suk Yong
• Choi Moon Ho
• Yun Jin Kyeong
• Kim Dong Hee

Classifications

• H01M10/0404

  Machines for assembling batteries · CPC title

• H01M10/052

  Li-accumulators · CPC title

• 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

• C08G73/0233

  Polyamines derived from (poly)oxazolines, (poly)oxazines or having pendant acyl groups · CPC title

• H01M4/04

  Processes of manufacture in general · CPC title