Cathode active material for lithium rechargeable battery, method of manufacturing the same, and lithium rechargeable battery including the same

Patent metadata

Field	Value
Publication number	US-9954221-B2
Application number	US-201414250790-A
Country	US
Kind code	B2
Filing date	Apr 11, 2014
Priority date	Nov 29, 2013
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

The present invention relates to a cathode active material for a lithium rechargeable battery, a method of manufacturing the same, and a lithium rechargeable battery including the same, and provides the cathode active material for the lithium rechargeable battery, including a core including a compound represented by the following Chemical Formula 1, and a coating layer positioned on the core and including a compound represented by the following Chemical Formula 2.

x Li 2 MnO 3 — (1-x) LiM 1 O 2   [Chemical Formula 1]
In Chemical Formula 1, 0<x<1 and M 1 is a transition metal.

y MnO z — (1-y) LiM 2 O 2   [Chemical Formula 2]
In Chemical Formula 2, 0<y<1, 1≤z≤4, and M 2 is a transition metal.

First claim

What is claimed is:

1. A cathode active material for a lithium rechargeable battery, comprising:
a core including a compound represented by the following Chemical Formula 1; and
a coating layer positioned on the core and including a compound represented by the following Chemical Formula 2:
x Li 2 MnO 3 — (1-x) LiM 1 O 2   [Chemical Formula 1]

wherein, in Chemical Formula 1, 0<x<1 and M 1 is a transition metal;
y MnO z — (1-y) LiM 2 O 2   [Chemical Formula 2]

wherein, in Chemical Formula 2, 0<y<1, 1≤z≤4, and M 2 is a transition metal,
wherein a thickness of the coating layer is 1 to 13 nm.

2. The cathode active material for a lithium rechargeable battery of claim 1 , further comprising
a reduced graphene oxide layer positioned on the coating layer.

3. The cathode active material for a lithium rechargeable battery of claim 2 , wherein
a thickness of the reduced graphene oxide layer is 1 to 5 nm.

4. The cathode active material for a lithium rechargeable battery of claim 1 , wherein
a Li/M molar ratio of the entire cathode active material including the core and the coating layer is 1.05 to 1.6.

5. The cathode active material for a lithium rechargeable battery of claim 1 , wherein
M 1 of Chemical Formula 1 and M 2 of Chemical Formula 2 include Ni, Co, or Mn.

6. A lithium rechargeable battery comprising:
a cathode including the cathode active material for the lithium rechargeable battery according to claim 1 ;
an anode including an anode active material; and
an electrolyte.

Assignees

• Unist Academy Industry Res Corporation
• Ulsan Nat Inst Science & Tech Unist

Inventors

• Cho Jaephil
• Oh Pilgun

Classifications

• H01M4/0471

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

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M4/0419

  involving spraying · CPC title