Spinel-structured lithium manganese-based positive electrode active material, and positive electrode and lithium secondary battery which include the positive electrode active material

Patent metadata

Field	Value
Publication number	US-11532807-B2
Application number	US-201816611542-A
Country	US
Kind code	B2
Filing date	Nov 6, 2018
Priority date	Nov 6, 2017
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

A spinel-structured lithium manganese-based positive electrode active material includes a lithium manganese oxide represented by Formula 1, and a coating layer which is disposed on a surface of the lithium manganese oxide and includes at least one coating element selected from the group consisting of aluminum, titanium, tungsten, boron, fluorine, phosphorus, magnesium, nickel, cobalt, iron, chromium, vanadium, copper, calcium, zinc, zirconium, niobium, molybdenum, strontium, antimony, bismuth, silicon, and sulfur, and a positive electrode and a lithium secondary battery which include the positive electrode active material,Li1+aMn2−bM1bO4−cAc  [Formula 1]wherein, in Formula 1, M1 is at least one metallic element including lithium (Li), A is at least one element selected from the group consisting of fluorine, chlorine, bromine, iodine, astatine, and sulfur, 0≤a≤0.2, 0<b≤0.5, and 0≤c≤0.1.

First claim

The invention claimed is:

1. A spinel-structured lithium manganese-based positive electrode active material comprising:
a lithium manganese oxide represented by Formula 1; and
a coating layer which is disposed on a surface of the lithium manganese oxide,
wherein the coating layer includes:
Li 1+a Mn 2−b M 1 b O 4−c A c   [Formula 1]

wherein, in Formula 1,
M 1 is lithium (Li) and optionally at least one other metallic element, A is at least one element selected from the group consisting of F, chlorine (Cl), bromine (Br), iodine (I), astatine (At), and S, 0≤a≤0.2, 0<b≤0.5, and 0≤c≤0.1.

2. The spinel-structured lithium manganese-based positive electrode active material of claim 1 , wherein the doping element M 1 further comprises at least one metallic element selected from the group consisting of Al, Mg, Zn, B, W, Ni, Co, Fe, Cr, V, ruthenium (Ru), Cu, cadmium (Cd), silver (Ag), yttrium (Y), scandium (Sc), gallium (Ga), indium (In), arsenic (As), Sb, platinum (Pt), gold (Au), and Si.

3. The spinel-structured lithium manganese-based positive electrode active material of claim 2 , further comprising a lithium boron composite oxide and a lithium tungsten composite oxide.

4. The spinel-structured lithium manganese-based positive electrode active material of claim 1 , wherein the doping element M 1 further comprises at least one metallic element selected from the group consisting of Al and Mg.

5. The spinel-structured lithium manganese-based positive electrode active material of claim 1 , wherein the lithium manganese oxide is represented by Formula 1-1:
Li 1+a Mn 2−b Li b1 M a b2 O 4−c A c   [Formula 1-1]

wherein, in Formula 1, M a is at least one metallic element selected from the group consisting of Al and Mg, 0≤a≤0.2, 0<b=b1+b2≤0.5, 0≤c≤0.1, and 0≤b1/b2≤1.3.

6. The spinel-structured lithium manganese-based positive electrode active material of claim 1 , wherein the coating layer has a thickness of 1 nm to 1,000 nm.

7. The spinel-structured lithium manganese-based positive electrode active material of claim 1 , wherein the lithium manganese-based positive electrode active material has an average particle diameter (D 50 ) of 1 μm to 20 μm.

8. The spinel-structured lithium manganese-based positive electrode active material of claim 1 , wherein the lithium manganese-based positive electrode active material has a specific surface area of 0.1 m 2 /g to 1.5 m 2 /g.

9. The spinel-structured lithium manganese-based positive electrode active material of claim 1 , wherein the lithium manganese-based positive electrode active material is in a form of a primary particle or a secondary particle formed by agglomeration of a plurality of primary particles.

10. The spinel-structured lithium manganese-based positive electrode active material of claim 9 , wherein the secondary particle is formed by agglomeration of 2 to 50 primary particles.

11. A positive electrode comprising a positive electrode collector, and a positive electrode active material layer formed on the positive electrode collector,
wherein the positive electrode active material layer comprises the spinel-structured lithium manganese-based positive electrode active material of claim 1 .

12. The positive electrode of claim 11 , wherein the positive electrode active material layer further comprises a lithium nickel-cobalt-manganese-based positive electrode active material represented by Formula 2:
Li 1+x Ni y Co z Mn w M 2 v O 2−p B p   [Formula 2]

wherein, in Formula 2, M 2 is at least one element selected from the group consisting of tungsten (W), copper (Cu), iron (Fe), vanadium (V), chromium (Cr), titanium (Ti), zirconium (Zr), zinc (Zn), aluminum (Al), indium (In), tantalum (Ta), yttrium (Y), lanthanum (La), strontium (Sr), gallium (Ga), scandium (Sc), gadolinium (Gd), samarium (Sm), calcium (Ca), cerium (Ce), niobium (Nb), magnesium (Mg), boron (B), and molybdenum (Mo), B is at least one element selected from the group consisting of fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and sulfur (S), 0≤x≤0.3, 0.50≤y<1, 0<z<0.35, 0<w<0.35, 0≤v≤0.1, and 0≤p≤0.1.

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

Assignees

• Lg Energy Solution Ltd

Inventors

• Baek So Ra
• Jung Wang Mo
• Kang Min Suk
• Lee Sang Wook
• Lho Eun Sol
• Wang Wen Xiu

Classifications

• H01M4/1315 Primary

  containing halogen atoms, e.g. LiCoOxFy · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/505

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

• C01P2006/40

  Electric properties · CPC title