Positive Electrode Active Material Comprising Lithium-Rich Lithium Manganese-Based Oxide And Further Comprising Lithium Tungsten Compound, Or Additionally Tungsten Compound On The Lithium-Rich Lithium Manganese-Based Oxide, And Positive Electrode For Lithium Secondary Battery Comprising The Same

Patent metadata

Field	Value
Publication number	US-2019386294-A1
Application number	US-201816489562-A
Country	US
Kind code	A1
Filing date	Sep 7, 2018
Priority date	Sep 29, 2017
Publication date	Dec 19, 2019
Grant date	—

Abstract

A positive electrode active material includes a lithium-rich lithium manganese-based oxide,
wherein the lithium-rich lithium manganese-based oxide is represented by the following chemical formula (1),

Li 1+a Ni x Co y Mn z M v O 2-b A b   (1)
wherein, 0<a≤0.2, 0<x≤0.4, 0<y≤0.4, 0.5≤z≤0.9, 0≤v≤0.2, a+x+y+z+v=1, and 0≤b≤0.5; M is one or more elements selected from the group consisting of Al, Zr, Zn, Ti, Mg, Ga, In, Ru, Nb, and Sn; and A is one or more elements selected from the group consisting of P, N, F, S and Cl; wherein (i) lithium tungsten (W) compound, or the (i) lithium tungsten (W) compound and (ii) tungsten (W) compound

are contained on the lithium-rich lithium manganese-based oxide; in an amount of 0.1% to 7% by weight based on the total weight of the positive electrode active material, wherein the (i) lithium tungsten (W) compound includes a composite of the (ii) tungsten (W) compound and a lithium.

First claim

1 . A positive electrode active material comprising a lithium-rich lithium manganese-based oxide,
wherein the lithium-rich lithium manganese-based oxide is represented by the following chemical formula (1),
Li 1+a Ni x Co y Mn z M v O 2-b A b   (1)

wherein, 0<a≤0.2, 0<x≤0.4, 0<y≤0.4, 0.5≤z≤0.9, 0≤v≤0.2, a+x+y+z+v=1, and 0≤b≤0.5; M is one or more elements selected from the group consisting of Al, Zr, Zn, Ti, Mg, Ga, In, Ru, Nb, and Sn; and A is one or more elements selected from the group consisting of P, N, F, S and Cl; wherein (i) lithium tungsten (W) compound, or the (i) lithium tungsten (W) compound and (ii) tungsten (W) compound are contained on a lithium-rich lithium manganese-based oxide, wherein the (i) lithium tungsten (W) compound including a composite of the (ii) tungsten (W) compound and a lithium, and wherein the (i) lithium tungsten (W) compound, or the (i) lithium tungsten (W) compound and the (ii) tungsten (W) compound are contained in an amount of 0.1% to 7% by weight based on the total weight of the positive electrode active material.

2 . The positive electrode active material according to claim 1 , wherein the tungsten (W) compound is at least one selected from the group consisting of tungsten oxide, tungsten carbide, and tungsten nitride.

3 . The positive electrode active material according to claim 1 , wherein the lithium tungsten compound is Li 2 WO 4 , Li 4 WO 5 or Li 6 W 2 O 9 .

4 . A method for producing the positive electrode active material of claim 1 , comprising:
(i) mixing a lithium-rich manganese-based oxide and a tungsten (W)-containing raw material to form a mixture; (ii) heat treating the mixture; wherein the tungsten (W)-containing raw material is mixed so as to contained in an amount 1 of 0.1% to 5% by weight based on a total weight of the lithium-rich lithium manganese-based oxide and the tungsten-containing raw material.

5 . The method for producing the positive electrode active material according to claim 4 , wherein the tungsten (W)-containing raw material is at least one selected from the group consisting of tungsten oxide, tungsten carbide, and tungsten nitride,

6 . The method for producing the positive electrode active material according to claim 4 , wherein the tungsten (W)-containing raw material reacts with lithium (Li) of a lithium-rich manganese-based oxide.

7 . The method for producing the positive electrode active material according to claim 4 , wherein the mixing is a dry mixing.

8 . The method for producing the positive electrode active material according to claim 4 , wherein the heat treating is performed at 300 to 800 degrees Celsius.

9 . A positive electrode comprising a positive electrode mixture comprising the positive electrode active material according to claim 1 formed on a current collector.

10 . A secondary battery comprising the positive electrode according to claim 9 .

11 . The method of claim 4 , wherein the tungsten (W)-containing raw material has an average diameter (D50) of 0.05 μm to 1 μm.

Assignees

• Lg Chemical Ltd

Inventors

• Han Gi Beom
• Hwang Jintae
• Park Sungbin
• Jung Wang Mo

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/1391

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

• H01M4/366 Primary

  as layered products · CPC title

• H01M10/0525

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