Positive Electrode Active Material, Positive Electrode Including the Positive Electrode Active Material, and Secondary Battery Including the Positive Electrode

Patent metadata

Field	Value
Publication number	US-2023343936-A1
Application number	US-202118021458-A
Country	US
Kind code	A1
Filing date	Aug 31, 2021
Priority date	Sep 1, 2020
Publication date	Oct 26, 2023
Grant date	—

Abstract

Provided is a positive electrode active material including a core and a coating layer disposed on the core, wherein the core includes Li 1+x M y O 2+z , wherein M is at least one element selected from the group consisting of nickel (Ni), cobalt (Co), manganese (Mn), iron (Fe), phosphorus (P), aluminum (Al), magnesium (Mg), calcium (Ca), zirconium (Zr), zinc (Zn), titanium (Ti), ruthenium (Ru), niobium (Nb), tungsten (W), boron (B), silicon (Si), sodium (Na), potassium (K), molybdenum (Mo), and vanadium (V), wherein − 0.2≤ x≤ 0.2, 0< y≤ 2, and 0≤ z≤ 2 , wherein the coating layer includes carbon-based particles, wherein the carbon-based particles includes a structure in which a plurality of graphene sheets are connected to each other, and wherein a D/G peak ratio of the positive electrode active material is in a range of 0.9 to 1.3 during Raman spectrum measurement.

First claim

1 . A positive electrode active material comprising a core and a coating layer disposed on the core,
wherein the core comprises Li 1+x M y O 2+z , wherein M is at least one element selected from the group consisting of nickel (Ni), cobalt (Co), manganese (Mn), iron (Fe), phosphorus (P), aluminum (Al), magnesium (Mg), calcium (Ca), zirconium (Zr), zinc (Zn), titanium (Ti), ruthenium (Ru), niobium (Nb), tungsten (W), boron (B), silicon (Si), sodium (Na), potassium (K), molybdenum (Mo), and vanadium (V), wherein −0.2≤x≤0.2, 0<y<2, and 0≤z≤2, wherein the coating layer comprises carbon-based particles, wherein the carbon-based particles comprises a structure in which a plurality of graphene sheets are connected to each other, and wherein a D/G peak ratio of the positive electrode active material is in a range of 0.9 to 1.3 during Raman spectrum measurement.

2 . The positive electrode active material of claim 1 , wherein the Li 1+x M y O 2+z comprises Li 1+x [Ni a Co b M 1 c M 2 d ]O 2 ,
wherein M 1 is at least one element selected from the group consisting of Al and Mn, wherein M 2 is at least one element selected from the group consisting of Fe, P, Mg, Ca, Zr, Zn, Ti, Ru, Nb, W, B, Si, Na, K, Mo, and V, and wherein 0<a<1, 0<b<1, 0<c<1, and 0≤d≤0.2.

3 . The positive electrode active material of claim 1 , wherein the each graphene sheet of the plurality of graphene sheets has a lateral size of 10 nm to 500 nm.

4 . The positive electrode active material of claim 1 , further comprising a connection portion connected to at least a part of the plurality of graphene sheets,
wherein the connection portion has a non-graphene shape.

5 . The positive electrode active material of claim 4 , wherein at least a portion of each graphene sheet of the plurality of graphene sheets is connected to the connection portion.

6 . The positive electrode active material of claim 1 , wherein the plurality of graphene sheets has an average thickness of 0.34 nm to 10 nm.

7 . The positive electrode active material of claim 1 , wherein the coating layer has a thickness of 1 nm to 500 nm.

8 . The positive electrode active material of claim 1 , wherein a powder electrical conductivity of the positive electrode active material is in a range of 1.0×10 −3 s/cm to 1.0×10 s/cm.

9 . The positive electrode active material of claim 1 , wherein a weight ratio of the core to the coating layer is in a range of 99.9:0.1 to 90:10.

10 . The positive electrode active material of claim 1 , wherein a specific surface area of the positive electrode active material is in a range of 2 m 2 /g to 8 m 2 /g.

11 . A positive electrode comprising the positive electrode active material of claim 1 .

12 . A secondary battery comprising the positive electrode of claim 11 .

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Tae Gon
• Kwak Min
• Kim Jeong Gil
• Kim Myeong Soo

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• 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

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/505

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