Positive Electrode Active Material Powder, and Positive Electrode and Lithium Secondary Battery Which Include the Same

Patent metadata

Field	Value
Publication number	US-2025149571-A1
Application number	US-202318836917-A
Country	US
Kind code	A1
Filing date	Feb 10, 2023
Priority date	Feb 11, 2022
Publication date	May 8, 2025
Grant date	—

Abstract

The present invention relates to positive electrode active material powder including overlithiated manganese-based oxide particles, which are represented by the disclosed Formula 1 and are in the form of a single particle composed of one nodule or a pseudo-single particle that is a composite of 2 to 30 or less nodules, and a positive electrode and a lithium secondary battery which include the positive electrode active material powder.

First claim

1 . A positive electrode active material powder comprising an overlithiated manganese-based oxide particles represented by Formula 1,
wherein the overlithiated manganese-based oxide particle is in a form of at least one of a single particle composed of one nodule or a pseudo-single particle that is a composite of 2 to 30 or less nodules:
Li a Ni b Co c Mn d M e O 2   Formula 1

wherein, in the Formula 1, 1<a, 0≤b≤0.5, 0≤c≤0.1, 0.5≤d≤1.0, and 0≤e≤0.2, and M is at least one selected from the group consisting of aluminum (Al), boron (B), cobalt (Co), tungsten (W), magnesium (Mg), vanadium (V), titanium (Ti), zinc (Zn), gallium (Ga), indium (In), ruthenium (Ru), niobium (Nb), tin (Sn), strontium (Sr), and zirconium (Zr).

2 . The positive electrode active material powder of claim 1 , wherein the positive electrode active material powder consists of the overlithiated manganese-based oxide particles having the form of at least one of the single particle and the pseudo-single particle.

3 . The positive electrode active material powder of claim 1 , wherein the positive electrode active material powder has an average particle diameter D 50 of 7.0 m or less.

4 . The positive electrode active material powder of claim 1 , wherein, in the Formula 1, 1.1≤a≤1.5, 0.1≤b≤0.4, 0≤c≤0.05, 0.5≤d≤0.80, and 0≤e≤0.1.

5 . The positive electrode active material powder of claim 1 , wherein the overlithiated manganese-based oxide particle has a crystal structure in which a layered phase and a rock salt phase are mixed.

6 . The positive electrode active material powder of claim 1 , wherein the nodule has an average diameter of 0.5 μm to 3.5 μm.

7 . The positive electrode active material powder of claim 1 , wherein the overlithiated manganese-based oxide has a crystalline size of 30 nm to 400 nm.

8 . A positive electrode comprising the positive electrode active material powder of claim 1 and a current collector.

9 . A lithium secondary battery comprising:
the positive electrode of claim 8 ; a negative electrode comprising a negative electrode active material; a separator disposed between the positive electrode and the negative electrode; and an electrolyte.

10 . The lithium secondary battery of claim 9 , wherein the negative electrode active material comprises a silicon-based negative electrode active material.

11 . The lithium secondary battery of claim 9 , wherein the negative electrode active material comprises a mixture of a silicon-based negative electrode active material and a carbon-based negative electrode active material.

12 . The lithium secondary battery of claim 9 , wherein the negative electrode active material is formed of silicon (Si), and
the lithium secondary battery has an N/P ratio of 150% to 300%.

13 . The lithium secondary battery of claim 9 , wherein the negative electrode active material is a mixture of a silicon oxide and a carbon-based negative electrode active material, and
the lithium secondary battery has an N/P ratio of 100% to 150%.

14 . The positive electrode active material powder of claim 1 , wherein the overlithiated manganese-based oxide particle has a two-phase crystal structure represented by the following Formula 2:
X Li 2 MnO 3 ·(1-X)Li[Ni 1-y-z-w Mn y Co z M w ]O 2   Formula 2
wherein, in the Formula 2, M is at least one selected from the group consisting of Al, B, Co, W, Mg, V, Ti, Zn, Ga, In, Ru, Nb, Sn, Sr, and Zr, 0.2≤X≤0.5, 0.4≤y<1, 0≤z≤0.1, and 0≤w≤0.2.

Assignees

• Lg Energy Solution Ltd

Inventors

• Hur Hyuck
• Park Sin Young
• Han Gi Beom
• Kim Dong Hwi
• Kwak Min
• Chae Seul Ki
• Park Kang Joon
• Jung Wang Mo

Classifications

• H01M2010/4292

  Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode · 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

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/483

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title