Composite positive electrode active material and positive electrode and lithium battery comprising the composite positive electrode active material

Patent metadata

Field	Value
Publication number	US-2016064730-A1
Application number	US-201514688277-A
Country	US
Kind code	A1
Filing date	Apr 16, 2015
Priority date	Aug 28, 2014
Publication date	Mar 3, 2016
Grant date	—

Abstract

A composite positive electrode active material includes a lithium transition metal oxide represented by at least one of LiNi x Co y Mn z O 2 (Formula 1) and aLi 2 MnO 3 .(1−a)LiMO 2 (Formula 2). In Formula 1, and a vanadium-based compound including a polyanion. In Formula 1, 0<x≦0.8, 0<y≦0.5, and 0<z≦0.5. In Formula 2, 0<a<1 and M is at least one element selected from aluminum (Al), magnesium (Mg), manganese (Mn), cobalt (Co), chromium (Cr), vanadium (V), iron (Fe), and nickel (Ni).

First claim

What is claimed is:

1 . A composite positive electrode active material, comprising:
a lithium transition metal oxide represented by at least one of Formulae 1 and 2 below; and a vanadium-based compound including a polyanion,
LiNi x Co y Mn z O 2   <Formula 1>

wherein in Formula 1, 0<x≦0.8, 0<y≦0.5, and 0<z≦0.5
a Li 2 MnO 3 .(1 −a )LiMO 2   <Formula 2>

wherein in Formula 2, 0<a<1 and M is at least one element selected from aluminum (Al), magnesium (Mg), manganese (Mn), cobalt (Co), chromium (Cr), vanadium (V), iron (Fe), and nickel (Ni).

2 . The composite positive electrode active material as claimed in claim 1 , wherein the vanadium-based compound includes a PO 4 3− polyanion.

3 . The composite positive electrode active material as claimed in claim 1 , wherein the vanadium-based compound includes Li 3 V 2 (PO 4 ) 3 .

4 . The composite positive electrode active material as claimed in claim 1 , wherein the vanadium-based compound is included as particles having a bimodal particle diameter distribution.

5 . The composite positive electrode active material as claimed in claim 4 , wherein particles in the bimodal particle distribution include large particles having an average particle diameter (D50) in a range of about 7 μm to about 20 μm.

6 . The composite positive electrode active material as claimed in claim 5 , wherein the particles in the bimodal particle diameter distribution include the large particles and further include small particles having an average particle diameter D50 in a range of about 0.1 μm to about 10 μm.

7 . The composite positive electrode active material as claimed in claim 1 , wherein the vanadium-based compound is included in a range of about 0.1 parts to about 40 parts by weight based on 100 parts by weight of a total weight of the composite positive electrode active material.

8 . The composite positive electrode active material as claimed in claim 1 , wherein the lithium transition metal oxide is included as particles having an average particle diameter D50 in a range of about 10 μm to about 20 μm.

9 . The composite positive electrode active material as claimed in claim 1 , wherein the vanadium-based compound is coated on at least a portion of a surface of the lithium transition metal oxide.

10 . The composite positive electrode active material as claimed in claim 1 , wherein the vanadium-based compound is discontinuously coated on a surface of the lithium transition metal oxide.

11 . The composite positive electrode active material as claimed in claim 10 , wherein the vanadium-based compound is included in a range of about 0.01 parts to about 20 parts by weight based on 100 parts by weight of a total weight of the composite positive electrode active material.

12 . A lithium battery, comprising:
a positive electrode including the composite positive electrode active material as claimed in claim 1 ; a negative electrode facing the positive electrode; and an electrolyte between the positive electrode and the negative electrode.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Park Haneol
• Kwon Seonyoung
• Kim Minhan
• Kim Jihyun
• Moon Joong-Ho
• Kim Kyounghyun
• Park Dohyung
• Choi Jongseo

Classifications

• H01M4/525

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

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• 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

• H01M2004/028

  Positive electrodes · CPC title