Method for recovering positive electrode active material from lithium secondary battery

Patent metadata

Field	Value
Publication number	US-11031632-B2
Application number	US-201815866654-A
Country	US
Kind code	B2
Filing date	Jan 10, 2018
Priority date	Jan 25, 2017
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

The present invention relates to a method for recovering a positive electrode active material from a lithium secondary battery including: 1) separating a positive electrode into a collector and a positive electrode part; 2) removing an organic substance by firing the separated positive electrode part; 3) washing the fired resultant and removing remaining fluorine (F); 4) adding a lithium-containing material into the washed resultant and firing to recover a lithium transition metal oxide.

First claim

What is claimed is:

1. A method for recovering a positive electrode active material from a lithium secondary battery, the method comprising:
1) separating a positive electrode into a collector and a positive electrode part;
2) removing an organic substance by firing the separated positive electrode part;
3) washing the fired resultant and removing residual fluorine (F); and
4) adding a lithium-containing material into the washed resultant and firing to reform a lithium transition metal oxide,
wherein the washing of step 3) is performed by using pure water.

2. The method for recovering a positive electrode active material from a lithium secondary battery of claim 1 , wherein the firing of step 2) is performed at a temperature of 300-1,200° C.

3. The method for recovering a positive electrode active material from a lithium secondary battery of claim 1 , wherein the firing of step 2) is performed for 20-600 minutes.

4. The method for recovering a positive electrode active material from a lithium secondary battery of claim 1 , further comprising pulverizing the separated positive electrode part prior to the firing of step 2).

5. The method for recovering a positive electrode active material from a lithium secondary battery of claim 1 , wherein the organic substance comprises a fluorine(F)-containing material.

6. The method for recovering a positive electrode active material from a lithium secondary battery of claim 1 , wherein the washing of step 3) is performed at a temperature of 0-100° C.

7. The method for recovering a positive electrode active material from a lithium secondary battery of claim 1 , wherein the washing of step 3) is performed for 1-600 minutes.

8. The method for recovering a positive electrode active material from a lithium secondary battery of claim 1 , wherein the washing of step 3) is performed by using 50-100,000 parts by weight of washing solution with respect to 100 parts by weight of the resultant.

9. The method for recovering a positive electrode active material from a lithium secondary battery of claim 1 , wherein in step 4), 1-40 parts by weight of a lithium-containing raw material is added with respect to 100 parts by weight of the resultant.

10. The method for recovering a positive electrode active material from a lithium secondary battery of claim 1 , wherein the firing of step 4) is performed at a temperature of 500-1,200° C.

11. The method for recovering a positive electrode active material from a lithium secondary battery of claim 1 , wherein the lithium transition metal oxide is represented by formula 1 below:
Li a Ni x Mn y Co z M w O 2+δ   [Formula 1]

(In formula 1, M includes one or more selected from the group consisting or Fe, Na, Mg, Ca, Ti, V, Cr, Cu, Zn, Ge, Sr, Ag, Ba, Zr, Nb, Mo, Al, Ga and B, and 0.9<a≤2.0, 0≤x≤0.95, 0≤y≤0.8, 0≤z≤1.0, 0<w≤0.1, −0.02≤δ≤0.02, x+y+z≤1).

12. The method for recovering a positive electrode active material from a lithium secondary battery of claim 1 , wherein the recovered positive electrode active material has a content of fluorine (F) of less than 1 wt %.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Dong Hun
• Lee Dae Jin
• Ryu Ji Hoon
• Han Gi Beom
• Kim Dong Hwi
• Jung Wang Mo
• Lee Sang Wook
• Lho Eun Sol

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/52

  Removing gases inside the secondary cell, e.g. by absorption (vent plugs or other mechanical arrangements for facilitating escape of gases H01M50/30) · CPC title

• H01M50/691

  Arrangements or processes for draining liquids from casings; Cleaning battery or cell casings · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title