Lithium compound, nickel-based cathode active material, method for preparing lithium oxide, method for preparing nickel-based cathode active material, and secondary battery using same

Patent metadata

Field	Value
Publication number	US-2022013773-A1
Application number	US-201917291774-A
Country	US
Kind code	A1
Filing date	Oct 11, 2019
Priority date	Nov 6, 2018
Publication date	Jan 13, 2022
Grant date	—

Abstract

The present invention relates to a lithium compound, a nickel-based cathode active material, a method for preparing lithium oxide, a method for preparing a nickel-based cathode active material, and a secondary battery using same. The lithium compound includes primary particles of Li2O having an average particle diameter (D50) of less than or equal to 5 μm; and secondary particles composed of the primary particles.

First claim

1 . A lithium compound, comprising
Li 2 O primary particles having an average particle diameter (D50) of less than or equal to 5 μm; and secondary particles composed of the primary particles.

2 . The lithium compound of claim 1 , wherein the secondary particle has a spherical shape.

3 . The lithium compound of claim 1 , wherein the average particle diameter (D50) of the secondary particles is 10 to 100 μm.

4 . The lithium compound of claim 3 , wherein the average particle diameter (D50) of the secondary particles is 10 to 30 μm.

5 . A nickel-based cathode active material derived from a lithium compound including primary Li 2 O particles having an average particle diameter (D50) of less than or equal to 5 μm and secondary particles composed of the primary particles; and a nickel raw material.

6 . The nickel-based cathode active material of claim 5 , wherein the cathode active material is Li 2 NiO 2 , and Dmin is greater than or equal to 5 μm.

7 . The nickel-based cathode active material of claim 6 , wherein the cathode active material comprises a residual lithium compound of less than or equal to 2.5 wt % based on 100 wt % of the total weight.

8 . A method for preparing lithium oxide, comprising
reacting hydrogen peroxide (H 2 O 2 ) and lithium hydroxide (LiOH) to obtain over-lithiated oxide (Li 2 O 2 ); and heat-treating the over-lithiated oxide to obtain lithium oxide (Li 2 O), wherein in the reacting of the hydrogen peroxide (H 2 O 2 ) and lithium hydroxide (LiOH) to obtain a over-lithiated oxide (Li 2 O 2 ), a mole ratio (Li/H 2 O 2 ) of lithium of lithium hydroxide to hydrogen peroxide is 1.9 to 2.4.

9 . The method of claim 8 , wherein
in the reacting of the hydrogen peroxide (H 2 O 2 ) and lithium hydroxide (LiOH) to obtain a over-lithiated oxide (Li 2 O 2 ), the reaction temperature is 40 to 60° C.

10 . The method of claim 8 , wherein
in the reacting of hydrogen peroxide (H 2 O 2 ) and lithium hydroxide (LiOH) to obtain over-lithiated oxide (Li 2 O 2 ), the reaction of hydrogen peroxide (H 2 O 2 ) and lithium hydroxide (LiOH) is accompanied by stirring at 500 rpm or more.

11 . The method of claim 8 , wherein
the heat-treating of the over-lithiated oxide to obtain lithium oxide (Li 2 O) is performed at 400 to 600° C. in an inert atmosphere.

12 . A method for preparing a nickel-based cathode active material, comprising
reacting hydrogen peroxide (H 2 O 2 ) and lithium hydroxide (LiOH) to obtain over-lithiated oxide (Li 2 O 2 ); heat-treating the over-lithiated oxide to obtain lithium oxide (Li 2 O); and firing the lithium oxide and nickel raw material to obtain a nickel-based cathode active material; wherein in the reacting of the hydrogen peroxide (H 2 O 2 ) and lithium hydroxide (LiOH) to obtain a over-lithiated oxide (Li 2 O 2 ), a mole ratio (Li/H 2 O 2 ) of lithium of lithium hydroxide to hydrogen peroxide is 1.9 to 2.4.

13 . (canceled)

Assignees

• Posco
• Res Inst Ind Science & Tech

Inventors

• Lee Jae Myung
• Ahn Jun-Kyu
• Kim Sang Won
• Yang Heok

Classifications

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/021

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

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2004/32

  Spheres · CPC title