Cathode active material for lithium secondary battery, method for producing same, and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-2019181445-A1
Application number	US-201716327244-A
Country	US
Kind code	A1
Filing date	Sep 4, 2017
Priority date	Sep 6, 2016
Publication date	Jun 13, 2019
Grant date	—

Abstract

The present disclosure relates to a cathode active material for a lithium secondary battery, a method for preparing same, and a lithium secondary battery comprising same, the cathode active material comprising a lithium-nickel compound oxide, wherein a c-axis lattice parameter of a unit lattice of the lithium-nickel compound oxide satisfies Formula 1:
14.1720 ÅA≤c≤14.1750 ÅA  [Formula 1]

First claim

1 . A cathode active material for a lithium secondary battery, comprising lithium nickel composite oxide,
wherein a lattice parameter of a unit lattice of the lithium nickel composite oxide satisfies Formula 1.
14.172 ÅA≤c≤14.175 ÅA  [Formula 1]

2 . The cathode active material for a lithium secondary battery of claim 1 , wherein
the lithium nickel composite oxide comprises a lithium compound disposed on the surface of the lithium nickel composite oxide, and an amount of lithium included in the lithium compound is less than or equal to 0.25 parts by weight based on 100 parts by weight of the cathode active material.

3 . The cathode active material for a lithium secondary battery of claim 2 , wherein the amount of the lithium included in the lithium compound is 0.05 parts by weight to 0.15 parts by weight based on 100 parts by weight of the cathode active material.

4 . The cathode active material for a lithium secondary battery of claim 2 , wherein the lithium compound comprises Li 2 CO 3 , LiOH, or a combination thereof.

5 . The cathode active material for a lithium secondary battery of claim 1 , wherein the lithium nickel composite oxide is represented by Chemical Formula 1.
Li p (Ni x Co y Me z )O 2   [Chemical Formula 1]
(In Chemical Formula 1, 0.9≤p≤1.1, 0.8≤x≤0.9, 0<y≤0.3, 0<z≤0.3, x+y+z=1, and Me is at least one of Al, Mn, Mg, Ti, and Zr.)

6 . The cathode active material for a lithium secondary battery of claim 1 , wherein the cathode active material does not have other diffraction peaks other than a diffraction peak of a (101) plane in a range of 2θ=25 degrees (°) to 38 degrees (°) in an X-ray diffraction (XRD) measurement.

7 . A method of preparing a cathode active material for a lithium secondary battery, comprising
mixing a nickel precursor and a lithium precursor to prepare a mixture and primarily firing the mixture; pulverizing the primarily-fired product and washing the same; drying the washed primarily-fired product; and secondarily firing the dried primarily-fired product wherein the washing is performed so that a ratio of the pulverized primarily-fired product and washing water is 0.5:1 to 1:10.

8 . The method of preparing a cathode active material for a lithium secondary battery of claim 7 , wherein the drying is performed at a temperature of less than or equal to 200° C.

9 . The method of preparing a cathode active material for a lithium secondary battery of claim 7 , wherein the secondarily firing is performed at a temperature of greater than or equal to 600° C.

10 . A lithium secondary battery, comprising
a cathode comprising the cathode active material of claim 1 ; an anode comprising an anode active material; and an electrolyte.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Daehoe
• Kim Dongjin
• Kim Minhan
• Kim Ilseok
• Park Dohyung
• Park Junseok
• Lim Okgyu
• Jeon Gyuran
• Choi Jeonjin

Classifications

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title

• H01M4/366

  as layered products · CPC title

• 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

• H01M10/0525

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

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title