Positive electrode active material for secondary battery, and secondary battery including the same

Patent metadata

Field	Value
Publication number	US-2019372115-A1
Application number	US-201916541651-A
Country	US
Kind code	A1
Filing date	Aug 15, 2019
Priority date	Nov 30, 2015
Publication date	Dec 5, 2019
Grant date	—

Abstract

wherein, in Formulae 1 to 3, A, M1 to M5, a, x, y, z, w, m, n, p, and q are the same as those defined in the specification.

First claim

What is claimed is:

1 . A method for preparing the positive electrode active material for a secondary battery, the method comprising:
preparing a precursor by reacting a nickel raw material, a cobalt raw material and an M1 raw material, wherein M1 is at least any one element selected from the group consisting of Al and Mn; forming a first surface-treated layer including an oxide of Formula 2 below, on a surface of a core including a lithium composite metal oxide of Formula 1 below, by mixing the precursor with a lithium raw material and an M3 raw material, wherein M3 is any one or at least two elements selected from the group consisting of W, Mo and Cr, and firing the resultant mixture; and forming a second surface-treated layer including a lithium compound of Formula 3 below, on the core with the first surface-treated layer formed thereon,
Li a Ni 1−x−y Co x M1 y M3 z M2 w O 2   [Formula 1]9

wherein, in Formula 1, M1 is at least any one selected from the group consisting of Al and Mn, M2 is any one or at least two elements selected from the group consisting of Zr, Ti, Mg, Ta and Nb, and M3 is any one or at least two elements selected from consisting of W, Mo, and Cr, and 1.0≤a≤1.5, 0<x≤0.5, 0<y≤0.5, 0.002≤z≤0.03, 0≤w≤0.02, 0<x+y≤0.7),
Li m M4O (m+n)/2   [Formula 2]

wherein, in Formula 2, M4 is any one or at least two elements selected from the group consisting of W, Mo, and Cr, and 2≤m≤6, and n is an oxidation number of M4),
Li p M5 q A r   [Formula 3]

wherein, in Formula 3, M5 is any one or at least two elements selected from the group consisting of elements in Group 13 to Group 15, A is any one selected from the group consisting of O, OH, CO 3 , PO 4 , F, and SO 4 , and 1≤p≤10, 1≤q≤10, r=(p+s)/t where s is the absolute value of an oxidation number of M5 and t is the absolute value of an oxidation number of A.

2 . The method of claim 1 , wherein the preparing of the precursor is performed through reaction by adding an ammonium cation-containing complexing agent and a basic compound into a metal-containing solution which is obtained by mixing a nickel raw material, a cobalt raw material, and an M1 raw material.

3 . The method of claim 2 , wherein an additional metal-containing solution including nickel, cobalt, M1, and M3, in concentrations of which are different from those in the metal-containing solution, is further added to the metal-containing solution.

4 . The method of claim 1 , wherein the lithium raw material is used such that a molar ratio (molar ratio of lithium/metal element) of lithium included in the lithium raw material and a metal element included in the precursor is 1.0 or more.

5 . The method of claim 1 , wherein the firing is performed at a temperature of 700° C. to 1,200° C.

6 . The method of claim 1 , wherein the firing is performed in an atmosphere of air or oxygen.

7 . The method of claim 1 , wherein the forming of the second surface-treated layer comprises performing surface-treatment on the core with the first surface-treated layer formed thereon, by using a composition including the lithium compound of Formula 3, and then performing heat treatment.

Assignees

• Lg Chemical Ltd

Inventors

• Shin Ju Kyung
• Jung Wang Mo
• Park Byung Chun
• Ryu Ji Hoon
• Park Sang Min
• Lee Sang Wook

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• C01G39/006

  Compounds containing molybdenum, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01M2004/021

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

• C01P2004/86

  Thin layer coatings, i.e. the coating thickness being less than 0.1 time the particle radius · CPC title