Octahedral-Structured Lithium Manganese-Based Positive Electrode Active Material, and Positive Electrode and Lithium Secondary Battery Which Include the Same

Patent metadata

Field	Value
Publication number	US-2022052331-A1
Application number	US-201917297251-A
Country	US
Kind code	A1
Filing date	Nov 1, 2019
Priority date	Nov 30, 2018
Publication date	Feb 17, 2022
Grant date	—

Abstract

A method of preparing an octahedral-structured lithium manganese-based positive electrode active material includes mixing a manganese raw material, a raw material including doping element M1, wherein the doping element M1 is at least one element selected from the group consisting of Mg, Al, Li, Zn, B, W, Ni, Co, Fe, Cr, V, Ru, Cu, Cd, Ag, Y, Sc, Ga, In, As, Sb, Pt, Au, and Si, and a lithium raw material and sintering the mixture in an oxygen atmosphere to prepare a lithium manganese oxide having an octahedral structure and doped with the doping element M1, wherein the sintering includes performing first sintering at 400° C. to 700° C. for 3 hours to 10 hours and performing second sintering at 700° C. to 900° C. for 10 hours to 20 hours. Also provided is an octahedral-structured lithium manganese-based positive electrode active material prepared by the above preparation method.

First claim

1 . A method of preparing an octahedral-structured lithium manganese-based positive electrode active material, comprising:
mixing a manganese raw material, a raw material including doping element M 1 , wherein the doping element M 1 is at least one element selected from the group consisting of magnesium (Mg), aluminum (Al), lithium (Li), zinc (Zn), boron (B), tungsten (W), nickel (Ni), cobalt (Co), iron (Fe), chromium (Cr), vanadium (V), ruthenium (Ru), copper (Cu), cadmium (Cd), silver (Ag), yttrium (Y), scandium (Sc), gallium (Ga), indium (In), arsenic (As), antimony (Sb), platinum (Pt), gold (Au), and silicon (Si)), and a lithium raw material, and sintering the mixture in an oxygen atmosphere to prepare a lithium manganese oxide having an octahedral structure and doped with the doping element M 1 , wherein the sintering comprises performing first sintering at 400° C. to 700° C. for 3 hours to 10 hours, and performing second sintering at 700° C. to 900° C. for 10 hours to 20 hours.

2 . The method of claim 1 , wherein the lithium manganese oxide is represented by Formula 1:
Li 1+a Mn 2-b M 1 b O 4-c A c    [Formula 1]
wherein, in Formula 1, M 1 is at least one element selected from the group consisting of Mg, Al, Li, Zn, B, W, Ni, Co, Fe, Cr, V, Ru, Cu, Cd, Ag, Y, Sc, Ga, In, As, Sb, Pt, Au, and Si, A 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≤a≤0.2, 0.05≤b≤0.3, and 0≤c≤0.1.

3 . The method of claim 1 , wherein the manganese raw material, the raw material including doping element M 1 , and the lithium raw material are mixed in amounts such that a molar ratio of Mn:M 1 :Li is in a range of 1.7:0.3:1 to 1.99:0.01:1.2.

4 . The method of claim 1 , wherein the raw material including doping element M 1 comprises at least one selected from Mg and or Al.

5 . An octahedral-structured lithium manganese-based positive electrode active material comprising: a lithium manganese oxide represented by Formula 1 and doped with doping element M 1 ,
wherein the lithium manganese oxide has an octahedral structure:
Li 1+a Mn 2-b M 1 b O 4-c A c    [Formula 1]

wherein, in Formula 1, M 1 is at least one element selected from the group consisting of magnesium (Mg), aluminum (Al), lithium (Li), zinc (Zn), boron (B), tungsten (W), nickel (Ni), cobalt (Co), iron (Fe), chromium (Cr), vanadium (V), ruthenium (Ru), copper (Cu), cadmium (Cd), silver (Ag), yttrium (Y), scandium (Sc), gallium (Ga), indium (In), arsenic (As), antimony (Sb), platinum (Pt), gold (Au), and silicon (Si), A 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≤a≤0.2, 0.05≤b≤0.3, and 0≤c≤0.1.

6 . The octahedral-structured lithium manganese-based positive electrode active material of claim 5 , wherein the lithium manganese oxide has a (111) oriented surface.

7 . The octahedral-structured lithium manganese-based positive electrode active material of claim 5 , wherein the doping element M 1 comprises at least one metallic element selected from the group consisting of Al and Mg.

8 . The octahedral-structured lithium manganese-based positive electrode active material of claim 5 , wherein the lithium manganese-based positive electrode active material has an average particle diameter (D 50 ) of 5 μm to 20 μm.

9 . The octahedral-structured lithium manganese-based positive electrode active material of claim 5 , wherein the lithium manganese-based positive electrode active material has a specific surface area of 0.3 m 2 /g to 1.0 m 2 /g.

10 . 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 octahedral-structured lithium manganese-based positive electrode active material of claim 5 .

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

Assignees

• Lg Energy Solution Ltd

Inventors

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

Classifications

• H01M4/505 Primary

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

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0525

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

• H01M4/366

  as layered products · CPC title

• H01M2004/028

  Positive electrodes · CPC title