Electrode active material for magnesium battery

Patent metadata

Field	Value
Publication number	US-10658662-B2
Application number	US-201415032836-A
Country	US
Kind code	B2
Filing date	Apr 29, 2014
Priority date	Oct 29, 2013
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

Provided are an electrode active material for a magnesium battery, including a complex transition metal oxide which is represented by a Formula 1 below and which includes λ-MnO2 phase having a cubic structure at a percentage of 60% or higher, an electrode and a magnesium battery including the same, and a method of preparing the electrode active material for a magnesium battery: <Formula 1> MxMnyOz In the Formula 1, 0<x≤1, 0.25≤y≤1, and 1≤z<3; and M is at least one metal selected from Mg2+, Ca2+, Na+, K+, and Zn2+.

First claim

The invention claimed is:

1. An electrode active material for a magnesium battery, the electrode active material comprising a complex transition metal oxide which is represented by a Formula 1 below and which includes λ-MnO 2 phase having a cubic structure at a percentage of 60% or higher:
(Mg) v MnO w   <Formula 1>

In the Formula 1,
0<v≤0.2 and 1<w<2.5.

2. The electrode active material for a magnesium battery of claim 1 , wherein the average oxidation number of the Mn positive ion of the complex transition metal oxide is +3.6 or higher.

3. The electrode active material for a magnesium battery of claim 1 , wherein the percentage of Mn 4+ with respect to the oxidation number of the total Mn positive ions is 60% or higher in an XPS analysis of the complex transition metal oxide.

4. The electrode active material for a magnesium battery of claim 1 , wherein the content of Mg included in the complex transition metal oxide is more than 0 wt % and less than 10 wt % with respect to the total weight of the complex transition metal oxide.

5. The electrode active material for a magnesium battery of claim 1 , wherein the average particle diameter of the complex transition metal oxide is from about 1 nm to about 200 nm.

6. The electrode active material for a magnesium battery of claim 1 , wherein the shape of the complex transition metal oxide includes a needle-like shape and a spherical shape.

7. The electrode active material for a magnesium battery of claim 1 , wherein the complex transition metal oxide further includes a phase having a Birnessite structure.

8. The electrode active material for a magnesium battery of claim 1 , wherein the electrode active material is a positive electrode active material.

9. An electrode for a magnesium battery, comprising the electrode active material according to claim 1 .

10. A magnesium battery comprising:
a positive electrode including the electrode active material according to claim 8 ;
a negative electrode; and
an electrolyte.

11. The magnesium battery of claim 10 , wherein the operation potential of the positive electrode active material is from about 1 V to about 4 V (vs. Mg/Mg 2+ ).

12. The magnesium battery of claim 10 , wherein the negative electrode comprises a magnesium metal, a magnesium metal-based alloy, a magnesium intercalating compound, or a carbonaceous material.

13. The magnesium battery of claim 10 , further comprising a separator interposed between the positive electrode and the negative electrode.

14. A method of preparing an electrode active material for a magnesium battery, the method comprising
obtaining a complex transition metal oxide having a spinel structure by a solid phase method or a liquid phase method; and
preparing a complex transition metal oxide which is represented by a Formula 1 below and which includes λ-MnO 2 phase having a cubic structure at a percentage of 60% or higher by treating with an acid the complex transition metal oxide having the spinel structure:
(Mg) v MnO w   <Formula 1>

In the Formula 1,
0<v≤0.2 and 1<w<2.5.

15. The method of preparing an electrode active material for a magnesium battery of claim 14 , wherein the complex transition metal oxide having the spinel structure comprises a complex transition metal oxide having a spinel structure prepared by a Pechini method.

16. The method of preparing an electrode active material for a magnesium battery of claim 14 , wherein the average particle diameter of the complex transition metal oxide represented by the Formula 1 is from about 1 nm to about 200 nm.

17. The method of preparing an electrode active material for a magnesium battery of claim 14 , wherein, in the Formula 1, 0<x≤0.5, 0.25≤y≤1, and 1≤z<2.5.

18. The method of preparing an electrode active material for a magnesium battery of claim 14 , wherein the acid concentration during the acid treatment is from about 0.1 M to about 3 M.

19. The method of preparing an electrode active material for a magnesium battery of claim 14 , wherein the acid used for the acid treatment is nitric acid, sulfuric acid, hydrochloric acid, acetic acid, or a salt thereof.

20. The method of preparing an electrode active material for a magnesium battery of claim 14 , wherein the content of Mg included in the complex transition metal oxide represented by the Formula 1 is more than 0 wt % and less than 10 wt % with respect to the total weight of the complex transition metal oxide.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Jusik
• Lee Seoksoo
• Kim Ryounghee
• Chang Wonseok

Classifications

• H01M4/623

  fluorinated polymers · CPC title

• C01G45/1228

  of the type (MnO2)-, e.g. LiMnO2 or Li(MxMn1-x)O2 · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/381

  Alkaline or alkaline earth metals elements (H01M4/40 takes precedence) · CPC title