Positive Electrode Active Material for Secondary Battery, Method of Preparing the Same, and Lithium Secondary Battery Including the Positive Electrode Active Material

Patent metadata

Field	Value
Publication number	US-2025046814-A1
Application number	US-202418926592-A
Country	US
Kind code	A1
Filing date	Oct 25, 2024
Priority date	Jan 24, 2018
Publication date	Feb 6, 2025
Grant date	—

Abstract

A positive electrode active material for a secondary battery includes a lithium composite transition metal oxide comprising nickel (Ni), cobalt (Co), and manganese (Mn), and a coating layer formed on surfaces of the lithium composite transition metal oxide, wherein, in the lithium composite transition metal oxide, an amount of the nickel (Ni) in a total amount of transition metals is 60 mol % or more, and an amount of the manganese (Mn) is greater than an amount of the cobalt (Co), and the coating layer comprises a compound represented by Formula 1:
Li a M 1 b O c   [Formula 1]

wherein, M1 includes aluminum (Al) and at least one selected from the group consisting of boron (B), silicon (Si), titanium (Ti), and phosphorus (P), and 1≤a≤4, 1≤b≤8, and 1≤c≤20.

First claim

1 . A positive electrode active material for a secondary battery, the positive electrode active material comprising:
a lithium composite transition metal oxide comprising nickel (Ni), cobalt (Co), and manganese (Mn), and a coating layer formed on surfaces of the lithium composite transition metal oxide, wherein, in the lithium composite transition metal oxide, an amount of the nickel (Ni) in a total amount of transition metals is 60 mol % or more, and an amount of the manganese (Mn) is greater than an amount of the cobalt (Co), and the coating layer comprises a compound represented by Formula 1:
Li a M 1 b O c   [Formula 1]

wherein, in Formula 1, M 1 comprises aluminum (Al) and at least one selected from the group consisting of boron (B), silicon (Si), titanium (Ti), and phosphorus (P), and 1≤a≤4, 1<b≤8, and 1≤c≤20.

2 . The positive electrode active material of claim 1 , wherein an amount of residual lithium by-products in the positive electrode active material is 1.0 wt % or less.

3 . The positive electrode active material for a secondary battery of claim 1 , wherein the coating layer comprises a lithium-boron-aluminum oxide.

4 . The positive electrode active material for a secondary battery of claim 3 , wherein, in the coating layer, boron and aluminum are included at a ratio of 0.3 part by weight:1 part by weight to 0.8 part by weight:1 part by weight.

5 . The positive electrode active material for a secondary battery of claim 1 , wherein the lithium composite transition metal oxide is represented by Formula 2:
Li p Ni 1−(x1+y1+z1) Co x1 Mn y1 M 2 z1 M 3 q1 O 2   [Formula 2]
wherein, in Formula 2, M 2 is at least one element selected from the group consisting of aluminum (Al), zirconium (Zr), boron (B), tungsten (W), magnesium (Mg), cerium (Ce), hafnium (Hf), tantalum (Ta), titanium (Ti), strontium (Sr), barium (Ba), fluorine (F), phosphorus (P), sulfur(S), and lanthanum (La), M 3 is at least one element selected from the group consisting of Al, Zr, Ti, Mg, Ta, niobium (Nb), molybdenum (Mo), W, and chromium (Cr), and 0.9≤p≤1.1, 0<x1≤0.4, 0<y1≤0.4, 0≤z1≤0.1, 0≤q1≤0.1, x1<y1, and 0<x1+y1+z1≤0.4.

6 . The positive electrode active material for a secondary battery of claim 1 , wherein, in the lithium composite transition metal oxide, the amount of the nickel (Ni) in the total amount of the transition metals is 80 mol % or more.

7 . The positive electrode active material for a secondary battery of claim 1 , wherein the coating layer is included in an amount of 0.02 part by weight to 0.2 part by weight based on 100 parts by weight of the lithium composite transition metal oxide.

8 . The positive electrode active material for a secondary battery of claim 1 , wherein the coating layer is formed to a thickness of 20 nm to 100 nm.

9 . The positive electrode active material for a secondary battery of claim 1 , wherein the lithium composite transition metal oxide is in the form of a secondary particle comprising agglomerated primary particles.

10 . A positive electrode for a secondary battery, the positive electrode comprising the positive electrode active material of claim 1 .

11 . A lithium secondary battery comprising the positive electrode of claim 10 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Baek So Ra
• Kang Min Suk
• Lee Sang Wook
• Jung Wang Mo
• Lee Dong Hun
• Jeon Hye Lim
• Lho Eun Sol

Classifications

• C01B35/121

  of alkali metal · CPC title

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2006/80

  Compositional purity · CPC title

• C01G53/50

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