Cathode active material, and cathode and magnesium secondary battery including the cathode active material

Patent metadata

Field	Value
Publication number	US-9325004-B2
Application number	US-201414149986-A
Country	US
Kind code	B2
Filing date	Jan 8, 2014
Priority date	Sep 23, 2013
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

A cathode active material for a magnesium secondary battery, the cathode active material including a composite transition metal oxide which is expressed by Chemical Formula 1 and intercalates and deintercalates magnesium:

Mg x Ma 1−y Mb y O 2+d   Chemical Formula 1

wherein 0≦x≦1, 0.05≦y<0.5, and −0.3≦d<1, and Ma and Mb are each independently a metal selected from the group consisting of Groups 5 to 12 of the Periodic Table.

First claim

What is claimed is:

1. A magnesium secondary battery comprising,
a cathode comprising a cathode active material;
an anode; and
an electrolyte comprising magnesium,
wherein the cathode active material comprises a composite transition metal oxide which is expressed by Chemical Formula 1 and intercalates and deintercalates magnesium:
Mg x Ma 1−y Mb y O 2+d   Chemical Formula 1

 wherein 0≦x≦1, 0.05≦y<0.5, and −0.3≦d<1, and
Ma and Mb are each independently a metal selected from the group consisting of Groups 5 to 12 of the Periodic Table.

2. The magnesium secondary battery of claim 1 , wherein an ionic radius of an Ma +4 ion is smaller than an ionic radius of an Mb +3 ion.

3. The magnesium secondary battery of claim 1 , wherein an ionic radius of an Ma +4 ion is in a range of about 0.050 nanometers to about 0.060 nanometers.

4. The magnesium secondary battery of claim 1 , wherein the Ma and the Mb are each independently oxidized or reduced during charge and discharge.

5. The magnesium secondary battery of claim 1 , wherein at least a portion of the composite transition metal oxide has a pyrolusite-type crystal structure.

6. The magnesium secondary battery of claim 1 , wherein the composite transition metal oxide has a degree of crystallinity which is less than a degree of crystallinity of a transition metal oxide which is not substituted with Mb.

7. The magnesium secondary battery of claim 1 , wherein the composite transition metal oxide is expressed by Chemical Formula 2:
Mg x Mn 1−y Mb y O 2+d   Chemical Formula 2

wherein 0≦x≦1, 0.05≦y<0.5, and −0.3≦d<1, and
Mb is a metal of Groups 5 to 12 of the Periodic Table other than manganese (Mn).

8. The magnesium secondary battery of claim 7 , wherein 0.1≦y<0.5 and −0.3≦d<0.5.

9. The magnesium secondary battery of claim 1 , wherein the composite transition metal oxide is expressed by Chemical Formula 3:
Mg x Mn 1−y Mc y O 2+d   Chemical Formula 3

wherein 0≦x≦1, 0.05≦y<0.5, and 0.3≦d<1, and
Mc is iron (Fe), cobalt (Co), nickel (Ni), zinc (Zn), or vanadium (V).

10. The magnesium secondary battery of claim 9 , wherein 0.1≦y<0.5 and −0.3≦d<0.5.

11. The magnesium secondary battery of claim 1 , wherein the composite transition metal oxide is expressed by Chemical Formula 4:
Mn 1−y Mc y O 2+d   Chemical Formula 4

wherein 0.05≦y<0.5 and −0.3≦d<1, and
Mc is Fe, Co, Ni, Zn, or V.

12. The magnesium secondary battery of claim 11 , wherein 0.1≦y<0.5 and −0.3≦d<0.5.

13. The magnesium secondary battery of claim 1 , wherein a particle diameter of the composite transition metal oxide is about 1 μm or less.

14. The magnesium secondary battery of claim 1 , wherein a particle diameter of the composite transition metal oxide is in a range of about 10 nanometers to about 990 nanometers.

15. The magnesium secondary battery of claim 1 , wherein the composite transition metal oxide has a needle shape or a spherical shape.

16. The magnesium secondary battery of claim 1 , wherein the composite transition metal oxide is porous.

17. The magnesium secondary battery of claim 1 , wherein the anode comprises magnesium metal, a magnesium metal alloy, a magnesium intercalation compound, or a carbonaceous material.

18. The magnesium secondary battery of claim 1 further comprising a separator disposed between the cathode and the anode.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Chang Won-Seok
• Lee Seok-Soo
• Kim Ju-Sik
• Lee Jae-Myung
• Han Dong-Wook

Classifications

• 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

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/505

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

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title