Positive electrode active material and lithium secondary battery including the same

Patent metadata

Field	Value
Publication number	US-2017084915-A1
Application number	US-201515126490-A
Country	US
Kind code	A1
Filing date	Mar 13, 2015
Priority date	Mar 18, 2014
Publication date	Mar 23, 2017
Grant date	—

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[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, 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

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, 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

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

Assignees

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

Inventors

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

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0525

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

• Y02E60/10

  Energy storage using 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