Positive electrode active material for lithium secondary battery, method for preparing same, and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-11670766-B2
Application number	US-201716468874-A
Country	US
Kind code	B2
Filing date	Dec 7, 2017
Priority date	Dec 12, 2016
Publication date	Jun 6, 2023
Grant date	Jun 6, 2023

Abstract

A positive electrode active material for a lithium secondary battery according to an embodiment of the present invention includes a lithium transition metal composite oxide and doping metals doped in the lithium-transition metal composite oxide, wherein the doping metals includes at least two kinds and the average oxidation number of the doping metals is greater than 3.5.

First claim

The invention claimed is:

1. A positive electrode active material for a lithium secondary battery, comprising
a lithium transition metal composite oxide represented by Chemical Formula 1:
Li a (Ni x Co y Mn 1-x-y ) b (M 1 Z M 2 1-z ) c O 2   [Chemical Formula 1]

wherein, 0.95≤a≤1.1, 0<b<1, 0<c<0.02, 0.5≤x<1, 0≤y≤0.2, and 0.65≤z<0.83; doping metals (M 1 and M 2 ) are doped to a lithium cation site in the lithium-transition metal composite oxide, and M 1 is aluminum (Al) and M 2 is molybdenum (Mo); and
an average oxidation number of the doping metals Al and Mo is in a range of 3.5 to 5, wherein the oxidation number of Al is +3 and the oxidation number of Mo is +6.

2. The positive electrode active material for a lithium secondary battery of claim 1 , wherein the x is greater than or equal to 0.8.

3. The positive electrode active material for a lithium secondary battery of claim 1 , wherein the c is greater than or equal to about 0.015.

4. The positive electrode active material for a lithium secondary battery of claim 1 , wherein the positive electrode active material for a secondary battery has an a-axis lattice parameter of 2.865 Å to 2.874 Å.

5. The positive electrode active material for a lithium secondary battery of claim 1 , wherein the positive electrode active material for a secondary battery has a c-axis lattice parameter of 14.180 Å to 14.214 Å.

6. The positive electrode active material for a lithium secondary battery of claim 1 , wherein the positive electrode active material for a secondary battery has c-axis lattice parameter/a-axis lattice parameter of 4.945 to 4.950.

7. A lithium secondary battery comprising
a positive electrode for a lithium secondary battery comprising the positive electrode active material of claim 1 ;
a negative electrode overlapped therewith; and
a separator interposed between the positive electrode and the negative electrode, and an electrolyte.

Assignees

• Posco
• Res Inst Ind Science & Tech
• Posco Holdings Inc

Inventors

• Nam Sang Cheol
• Lee Jae Won
• Park Jong Il
• Lee Jae Myung
• Park Geun Gyung

Classifications

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title

• C01P2002/85

  by XPS, EDX or EDAX data · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title