Positive electrode active material and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-10217997-B2
Application number	US-201515126490-A
Country	US
Kind code	B2
Filing date	Mar 13, 2015
Priority date	Mar 18, 2014
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

Disclosed herein are a positive electrode active material including at least one selected from among compounds represented by Formula 1 below and a lithium secondary battery including the same that is capable of improving lifetime characteristics and rate characteristics while exhibiting excellent safety: Li[LixMyM′(1-x-y)]O2-zAz (1), where M is at least one element selected from a group consisting of Ru, Mo, Nb, Te, Re, Ir, Pt, Cr, S, W, Os, and Po, M′ is at least one element selected from a group consisting of Ni, Ti, Co, Al, Mn, Fe, Mg, B, Cr, Zr, Zn, and second row transition metals, A is a negative monovalent or divalent anion, and 0<x<0.3, 0.2≤y≤0.5, 0≤z<0.5, and 0.2<x+y<0.8.

First claim

The invention claimed is:

1. A positive electrode active material comprising at least one selected from among compounds represented by Formula 1 below:
Li[Li x M y M′ (1-x-y) ]O 2-z A z   (1),

where
M is at least one element selected from a group consisting of Ru, Te, Re, Ir, Pt, S, W, Os, and Po,
M′ is at least one element selected from a group consisting of Ni, Ti, Co, Al, Mn, Fe, Mg, B, Cr, Zr, Zn, and second row transition metals,

A is a negative monovalent or divalent anion, and
0<x<0.3, 0.2≤y≤0.5, 0≤z<0.5, and 0.2<x+y<0.8.

2. The positive electrode active material according to claim 1 , wherein M is at least one element selected from a group consisting of Ru, S, W, Os, and Po.

3. The positive electrode active material according to claim 2 , wherein M is Ru.

4. The positive electrode active material according to claim 1 , wherein M′ is at least two elements selected from a group consisting of Ni, Ti, Co, Al, Fe, Mg, B, Cr, Zr, and Zn.

5. The positive electrode active material according to claim 1 , wherein M′ (1-x-y) is Ni a Mn b (0<a<0.8, 0<b<0.8, and a+b+x+y=1).

6. The positive electrode active material according to claim 5 , wherein 0.1≤a≤0.6, 0<b<0.8, 0.5≤a+b≤0.8, and a+b+x+y=1.

7. The positive electrode active material according to claim 1 , wherein 0<x≤0.25.

8. The positive electrode active material according to claim 1 , wherein 0.2≤y≤0.4.

9. The positive electrode active material according to claim 1 , wherein 0.2<x+y≤0.6.

10. The positive electrode active material according to claim 1 , wherein A is at least one element selected from a group consisting of halogen elements, sulfur, and nitrogen.

11. A positive electrode for secondary batteries formed by applying a positive electrode active material according to claim 1 to a current collector.

12. A lithium secondary battery comprising a positive electrode for secondary batteries according to claim 11 .

13. A battery module comprising a lithium secondary battery according to claim 12 as a unit battery.

14. A battery pack comprising a battery module according to claim 13 .

15. A device using a battery pack according to claim 14 as a power source.

16. The device according to claim 15 , wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage apparatus.

17. The positive electrode material of claim 1 , wherein 0<z<0.5, and A is at least one selected from the group consisting of F, Cl, Br, I, S, and N.

Assignees

• Lg Chemical Ltd
• Res Affairs Of Snu & Snu R&Db Foundation

Inventors

• Hah Hoe Jin
• Kim Kyoung Ho
• Kim Il Hong
• Kim Je Young
• Kang Kisuk
• Hong Jihyun

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/505

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

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M10/052

  Li-accumulators · CPC title

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title