Cathode active material particles, lithium ion battery prepared by using the cathode active material particles, and method of preparing the cathode active material particles

Patent metadata

Field	Value
Publication number	US-2017069912-A1
Application number	US-201615260540-A
Country	US
Kind code	A1
Filing date	Sep 9, 2016
Priority date	Sep 9, 2015
Publication date	Mar 9, 2017
Grant date	—

Abstract

A lithium ion secondary battery including: a cathode including a plurality cathode active material particles; an electrolyte; and an anode, wherein a cathode active material particle of the plurality of cathode active material particles has a plate-shaped crystal structure having an aspect ratio of 2 to 1000, wherein a major surface in at least one direction of the plate-shaped crystal structure is a 111 face, wherein the cathode active material particle also has a spinel-type crystal structure, and wherein the cathode active material particle has a composition represented by the formula LiCo 2-x Ni x O 4 , wherein 0<x<2.

First claim

What is claimed is:

1 . A lithium ion secondary battery comprising:
a cathode comprising a plurality of cathode active material particles; an electrolyte; and an anode, wherein a cathode active material particle of the plurality of cathode active material particles has a plate-shaped crystal structure having an aspect ratio of 2 to 1000, wherein a major surface in at least one direction of the plate-shaped crystal structure is a 111 face, wherein the cathode active material particle also has a spinel-type crystal structure, and wherein the cathode active material particle has a composition represented by the formula LiCo 2-x Ni x O 4 , wherein 0<x<2.

2 . The lithium ion secondary battery of claim 1 , wherein x is about 0.8 to about 1.2.

3 . The lithium ion secondary battery of claim 2 , wherein x is about 1.

4 . The lithium ion secondary battery of claim 1 , wherein an average particle diameter of the plurality of cathode active material particles is about 1000 nanometers or less.

5 . The lithium ion secondary battery of claim 4 , wherein the average particle diameter of the plurality of cathode active material particles is about 500 nanometers or less.

6 . The lithium ion secondary battery of claim 1 , wherein each of the plurality of cathode active material particles has a single crystal structure.

7 . The lithium ion secondary battery of claim 6 , wherein the plurality of cathode active material particles have the plate-shaped crystal structure having the aspect ratio of 2 to 1000,
wherein the major surface in at last one direction of the plate-shaped crystal structure is the 111 face.

8 . The lithium ion secondary battery of claim 1 , wherein x is about 1.2.

9 . A plurality of cathode active material particles, the plurality of cathode active material particles comprising a plate-shaped crystal structure having an aspect ratio of 2 to 1000,
wherein a major surface in at least one direction of the plate-shaped crystal structure is a 111 face, wherein the plurality of cathode active material particles further comprises a spinel-type crystal structure, and wherein the plurality of cathode active material particles comprises a composition represented by the formula LiCo 2-x Ni x O 4 , wherein 0<x<2.

10 . The plurality of cathode active material particles of claim 9 , wherein x is about 0.8 to about 1.2.

11 . The plurality of cathode active material particles of claim 10 , wherein x is about 1.

12 . The plurality of cathode active material particles of claim 9 , wherein an average particle diameter of the plurality cathode active material particles is about 1000 nanometers or less.

13 . The plurality of cathode active material particles of claim 12 , wherein an average particle diameter of the plurality of cathode active material particles is about 500 nanometers or less.

14 . The plurality of cathode active material particles of claim 9 , wherein the plurality of cathode active material particles have a single crystal structure.

15 . A method of preparing a plurality of cathode active material particles, the method comprising:
contacting a cobalt-containing material, a nickel-containing material, and a lithium-containing material in a supercritical fluid to produce a metal composite oxide comprising cobalt, nickel, and lithium; and heat-treating the metal composite oxide and the lithium-containing material to prepare the plurality of cathode active material particles, wherein a cathode active material particle of the plurality of cathode active material particles has a plate-shaped crystal structure having an aspect ratio of 2 to 1000, wherein a major surface in at least one direction of the plate-shaped crystal structure is a 111 face, wherein the cathode active material particle also has a spinel-type crystal structure, and wherein the cathode active material particle has a composition represented by the formula LiCo 2-x Ni x O 4 , wherein 0<x<2.

16 . The method of claim 15 , wherein x is about 0.8 to about 1.2.

17 . The method of claim 16 , wherein x is about 1.

18 . The method of claim 15 , wherein an average particle diameter of the plurality of cathode active material particles is about 1000 nanometers or less.

19 . The method of claim 18 , wherein an average particle diameter of the plurality of cathode active material particles is about 500 nanometers or less.

20 . The method of claim 15 , wherein the plurality of cathode active material particles have a single crystal structure.

Assignees

• Samsung Electronics Co Ltd
• Tohoku Techno Arch Co Ltd

Inventors

• Honma Itaru
• DEVARAJU Murukanahally Kempaiah
• Aihara Yuichi
• Ito Seitaro

Classifications

• H01M4/131

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

• H01M4/1391

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

• H01M10/0525

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

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · 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