Positive Electrode for Lithium Secondary Battery and Lithium Secondary Battery Including the Same

Patent metadata

Field	Value
Publication number	US-2025054942-A1
Application number	US-202218723063-A
Country	US
Kind code	A1
Filing date	Dec 22, 2022
Priority date	Dec 22, 2021
Publication date	Feb 13, 2025
Grant date	—

Abstract

A positive electrode for a lithium secondary battery includes a collector; and a positive electrode active material layer disposed on at least one surface of the collector, wherein the ratio of a peak intensity of a (003) plane to a peak intensity of a (101) plane of the positive electrode measured by X-ray diffraction analysis is 8 or more.

First claim

1 . A positive electrode for a lithium secondary battery comprising:
a collector; and a positive electrode active material layer disposed on at least one surface of the collector, wherein a ratio I (003) /I (101) of a peak intensity I (003) of a (003) plane to a peak intensity I (101) of a (101) plane of the positive electrode measured by X-ray diffraction analysis is 8 or more.

2 . The positive electrode of claim 1 , wherein the positive electrode active material layer comprises a first positive electrode active material and a second positive electrode active material, wherein the first positive electrode active material comprises a first lithium composite transition metal oxide in the form of a single particle composed of a single primary particle, or a quasi-single particle which is an aggregate of at most 10 primary particles.

3 . The positive electrode of claim 1 , wherein the ratio of I (003) /I (101) is from 8 to 16.

4 . The positive electrode of claim 2 , wherein the first lithium composite transition metal oxide has a composition represented by Formula 1 below:
Li a1 Ni b1 Co c1 M 1 d1 M 2 e1 O 2   [Formula 1]
wherein, M 1 includes at least one of Mn or Al, M 2 includes at least one of Zr, Y, W, Ti, Mg, Ca, Sr, or Ba, 0.8≤a1≤1.2, 0.75≤b1<1, 0<c1<0.25, 0<d1<0.25, and 0≤e1≤0.1.

5 . The positive electrode of claim 2 , wherein the first positive electrode active material has an average particle diameter (D 50 ) of 2 μm to 8 μm.

6 . The positive electrode of claim 2 , wherein the first positive electrode active material further comprises a coating layer disposed on a surface of the first lithium composite transition metal oxide, and the coating layer comprises at least one coating element of Al, Ti, W, B, F, P, Mg, Ni, Co, Fe, Cr, V, Cu, Ca, Zn, Zr, Nb, Mo, Sr, Sb, Bi, Si, or S.

7 . The positive electrode of claim 2 , wherein the first positive electrode active material further comprises a coating layer disposed on a surface of the first lithium composite transition metal oxide, and the coating layer comprises at least one coating element of B, Co, Fe, or Cr.

8 . The positive electrode of claim 2 , wherein the second positive electrode active material comprises a second lithium composite transition metal oxide in the form of a secondary particle.

9 . The positive electrode of claim 8 , wherein the second lithium composite transition metal oxide has a composition represented by Formula 2 below:
Li a2 Ni b2 Co c2 M 3 d2 M 4 e2 O 2   [Formula 2]
wherein, M 3 includes at least of Mn or Al, M 4 includes at least one of Zr, Y, W, Ti, Mg, Ca, Sr, or Ba, 0.8≤a2≤1.2, 0.75≤b2<1, 0<c2<0.25, 0<d2<0.25, and 0≤e2≤0.1.

10 . The positive electrode of claim 2 , wherein the second positive electrode active material has an average particle diameter (D 50 ) of 8 μm to 20 μm.

11 . The positive electrode of claim 2 , wherein a weight ratio of the first positive electrode active material and the second positive electrode active material is from 1:0.5 to 1:3.

12 . A lithium secondary battery comprising:
the positive electrode of claim 1 ; a negative electrode facing the positive electrode for a lithium secondary battery; a separator interposed between the positive electrode and the negative electrode; and an electrolyte.

Assignees

• Lg Energy Solution Ltd

Inventors

• Lho Eun Sol
• Han Gi Beom
• Kim Jong Woo
• Jung Wang Mo
• Park Sang Min
• Lee Sang Wook
• Kim Seul Ki
• Kim Hyeong Ii

Classifications

• H01M2004/028

  Positive electrodes · 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

• H01M4/628

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · 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