Positive Electrode Active Material Precursor for Secondary Battery, Preparation Method Thereof and Method of Preparing Positive Electrode Active Material

Patent metadata

Field	Value
Publication number	US-2025062336-A1
Application number	US-202418936366-A
Country	US
Kind code	A1
Filing date	Nov 4, 2024
Priority date	Sep 26, 2019
Publication date	Feb 20, 2025
Grant date	—

Abstract

A method of preparing a positive electrode active material precursor for a secondary battery includes preparing a positive electrode active material precursor by a co-precipitation reaction while adding a transition metal-containing solution containing transition metal cations, a basic solution, and an ammonium solution to a batch-type reactor, wherein a molar ratio of ammonium ions contained in the ammonium solution to the transition metal cations contained in the transition metal-containing solution added to the batch-type reactor is 0.5 or less, and a pH in the batch-type reactor is maintained at 11.2 or less.

First claim

1 . A positive electrode active material precursor for a secondary battery,
wherein the positive electrode active material precursor is prepared by a co-precipitation reaction while adding a transition metal-containing solution containing transition metal cations, a basic solution, and an ammonium solution to a batch-type reactor, wherein a molar ratio of ammonium ions contained in the ammonium solution to the transition metal cations contained in the transition metal-containing solution added to the batch-type reactor is 0.5 or less, and the pH in the batch-type reactor is maintained at 11.2 or less, wherein the positive electrode active material precursor has an aspect ratio of a primary particle of less than 0.5, the positive electrode active material precursor has an average particle diameter (D 50 ) of a secondary particle ranging from 4 μm to 20 μm, and the positive electrode active material precursor has a specific surface area of 9 m 2 /g or more.

2 . The positive electrode active material precursor of claim 1 , wherein the positive electrode active material precursor is represented by Formula 1:
[Ni x Co y Mn z M 1 w ](OH) 2   [Formula 1]
wherein, in Formula 1, M 1 comprises at least one element selected from the group consisting of zirconium (Zr), boron (B), tungsten (W), molybdenum (Mo), chromium (Cr), niobium (Nb), aluminum (Al), magnesium (Mg), hafnium (Hf), tantalum (Ta), lanthanum (La), titanium (Ti), strontium (Sr), barium (Ba), cerium (Ce), fluorine (F), phosphorus (P), sulfur (S), and yttrium (Y), 0.8≤x<1, 0<y≤0.1, 0<z≤0.1, 0≤w≤0.1, and x+y+z+w=1.

3 . The positive electrode active material precursor of claim 1 , wherein particle nucleation and particle growth are performed without changing the pH in the batch-type reactor during the co-precipitation reaction.

4 . The positive electrode active material precursor of claim 1 , wherein the molar ratio of the ammonium ions to the transition metal cations ranges from 0.1 to 0.5.

5 . The positive electrode active material precursor of claim 1 , wherein the molar ratio of the ammonium ions to the transition metal cations ranges from 0.2 to 0.35.

6 . The positive electrode active material precursor of claim 1 , wherein the pH in the batch-type reactor is maintained at 10.8 to 11.2.

7 . The positive electrode active material precursor of claim 1 , wherein, during the co-precipitation reaction, a stirring speed in a particle nucleation step is in a range of 600 rpm to 800 rpm, and a stirring speed in a particle growth step is in a range of 200 rpm to 400 rpm.

8 . The positive electrode active material precursor of claim 1 , wherein, during the co-precipitation reaction, a stirring speed in a particle nucleation step is in a range of 650 rpm to 750 rpm, and a stirring speed in a particle growth step is in a range of 250 rpm to 350 rpm.

9 . The positive electrode active material precursor of claim 1 , wherein the specific surface area ranges from 9 m 2 /g to 13 m 2 /g.

10 . The positive electrode active material precursor of claim 1 , wherein the aspect ratio ranges from 0.2 to 0.3.

11 . The positive electrode active material precursor of claim 1 , wherein the average particle diameter (D 50 ) ranges from 13 μm to 16 μm.

12 . A positive electrode active material for a secondary battery prepared by:
mixing the positive electrode active material precursor of claim 1 with a lithium source to form a mixture; and sintering the mixture to form a lithium transition metal oxide,
wherein a pellet density of the positive electrode active material is 2.80 g/cc or more.

13 . The positive electrode active material of claim 12 , wherein the pellet density of the positive electrode active material ranges from 2.83 g/cc to 3.4 g/cc.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Min Joon
• Cho Seung Beom
• Ye Seong Ji
• Park Yoon Bin

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/021

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

• C01P2006/40

  Electric properties · CPC title

• C01P2006/12

  Surface area · CPC title