Precursor of electrode active material coated with metal and method of preparing the same

Patent metadata

Field	Value
Publication number	US-10243208-B2
Application number	US-201314440194-A
Country	US
Kind code	B2
Filing date	Nov 26, 2013
Priority date	Nov 26, 2012
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

Disclosed are a precursor of an electrode active material for a lithium secondary battery, in which a metal material ionizable through electrolytic decomposition is uniformly coated on a surface of a primary precursor formed of a transition metal hydrate, and a method of preparing the same.

First claim

The invention claimed is:

1. A method of preparing a precursor of an electrode material for a lithium secondary battery, comprising: preparing a primary precursor in the form of a hydrate; coating the primary precursor with a material through electrolytic decomposition; and drying the coated primary precursor, wherein the material is uniformly coated on a surface of the primary precursor, and the material comprises an electrolytically decomposable transition metal, P, or Al, wherein the electrolytically decomposable transition metal is at least one element selected from the group consisting of Ni, Co, Mn, Fe, Sn, Mo, Nd, Zr, and Zn; and wherein the primary precursor is represented by Formula 1 below:
M(OH 1−z ) 2   (1)

wherein 0.4<z<1; and M is Ni a Mn b Me c , wherein a+b≤1, 0.3≤a≤0.9, 0.1≤b≤0.8, and O≤c≤0.2; and Me is at least one element selected from the group consisting of Co, Al, Mg, Ti, Sr, Zn, B, Ca, Cr, Si, Ga, Sn, P, V, Sb, Nb, Ta, Mo, W, Zr, Y, and Fe.

2. The method according to claim 1 , wherein the coating is performed such that the material is ionized in an aqueous acid solution, forming an intermediate, followed by reduction.

3. The method of claim 2 , wherein the intermediate is a metal salt.

4. The method of claim 1 , wherein the metal salt is a sulfate or a nitrate.

5. The method of claim 1 , wherein the electrolytic decomposition is performed using a catalyst.

6. The method of claim 1 , wherein the catalyst is at least one selected from the group consisting of a ZnCl 2 -based catalyst, a CoCl 2 -based catalyst, a MnCl 2 -based catalyst, a NiCl 2 -based catalyst, and a SnCl 2 -based catalyst.

7. The method of claim 1 , wherein Me comprises Co.

8. The method of claim 1 , wherein the material has a coating thickness of 0.1 μm to 1 μm.

9. The method of claim 1 , wherein an amount of the material is 0.01% to 5% based on a total weight of the precursor.

10. The method of claim 1 , wherein the material is completely or partially coated on a surface of the primary precursor.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Dae Jin
• Jin Joo Hong
• Kong Woo Yeon
• Shin Sun Sik
• Jung Wang Mo

Classifications

• C01G53/006

  Chemistry & Metallurgy · mapped topic

• 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

• H01M10/0525

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

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title