Manganese oxide nano-rods in the form of a core-shell, a method for producing the same, and an active material for a secondary battery comprising the same

Patent metadata

Field	Value
Publication number	US-10522826-B2
Application number	US-201715818635-A
Country	US
Kind code	B2
Filing date	Nov 20, 2017
Priority date	Dec 16, 2016
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

The present disclosure relates to manganese oxide nano-rods in the form of a core-shell, in which the manganese oxide nano-rods are formed in a core-shell structure, the core and the shell each include MnxOy, when x of MnxOy of the core is 1 and y is 2, x of MnxOy of the shell is 2 and y is 3, and when x of MnxOy of the core is 2 and y is 3, x of MnxOy of the shell is 1 and y is 2. According to the present disclosure, in the secondary battery using the manganese oxide, the elution of manganese is inhibited and the structural stability of an active material is increased, thereby increasing the capacity and the cycle life at a high temperature.

First claim

What is claimed is:

1. Manganese oxide nano-rods in a form of a core-shell,
wherein the manganese oxide nano-rods are formed in a core-shell structure,
the core and the shell each include Mn x O y ,
when x of Mn x O y of the core is 1 and y is 2, x of Mn x O y of the shell is 2 and y is 3, and when x of Mn x O y of the core is 2 and y is 3, x of Mn x O y of the shell is 1 and y is 2,
wherein a mass ratio of Mn x O y included in the core and the shell falls within a range of 10:1 to 10:4.

2. The manganese oxide nano-rods in the form of a core-shell according to claim 1 , wherein the manganese oxide nano-rods in the form of a core-shell have a particle diameter ranging from 20 to 50 tire.

3. The manganese oxide nano-rods in the form of a core-shell according to claim 2 , wherein a thickness of the shell of the manganese oxide nano-rods in the form of a core-shell falls within a range of 1 to 10 nm.

4. An active material for a secondary battery comprising manganese oxide nano-rods in a form of a core-shell,
wherein the manganese oxide nano-rods are formed in a core-shell structure,
the core and the shell each include Mn x O y ,
when x of Mn x O y of the core is 1 and y is 2, x of Mn x O y of the shell is 2 and y is 3, and when x of Mn x O y of the core is 2 and y is 3, x of Mn x O y of the shell is 1 and y is 2,
wherein a mass ratio of Mn x O y included in the core and the shell falls within a range of 10:1 to 10:4.

5. The active material for a secondary battery according to claim 4 , wherein the manganese oxide nano-rods in the form of a core-shell have a particle diameter ranging from 20 to 50 nm.

6. The active material for a secondary battery according to claim 5 , wherein a thickness of the shell of the manganese oxide nano-rods in the form of a core-shell falls within a range of 1 to 10 nm.

Assignees

• Korea Basic Science Inst

Inventors

• Lee Jin Bae
• Kim Hae Jin
• Hong Won Gi
• Lee Sang Moon
• Kim Yeon Ho

Classifications

• H01M2004/021

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

• C01P2004/16

  Nanowires or nanorods, i.e. solid nanofibres with two nearly equal dimensions between 1-100 nanometer · CPC title

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• C01P2004/04

  obtained by TEM, STEM, STM or AFM · CPC title