Sodium secondary battery

Patent metadata

Field	Value
Publication number	US-9553337-B2
Application number	US-201414555852-A
Country	US
Kind code	B2
Filing date	Nov 28, 2014
Priority date	Nov 28, 2013
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

Provided is a sodium secondary battery capable of operating at a low temperature. More particularly, the sodium secondary battery according to the present invention includes: an anode containing sodium; a cathode containing a transition metal and an alkali metal halide; and a sodium ion conductive solid electrolyte provided between the anode and the cathode, wherein the cathode is impregnated in a molten salt electrolyte containing a sodium.metal halogen salt including at least two kinds of halogens.

First claim

What is claimed is:

1. A sodium secondary battery comprising:
an anode containing sodium;
a cathode containing a transition metal and an alkali metal halide; and
a sodium ion conductive solid electrolyte provided between the anode and the cathode,
wherein the cathode is impregnated in a molten salt electrolyte represented by the following Chemical Formula 1.
NaM(X 1 ) n (X 2 ) 4−n   Chemical Formula 1

In Chemical Formula 1,
M is an element selected from metal and metalloid groups having an oxidation number of 3;
X 1 and X 2 are each independently selected from halogen elements; and
n is more than 0 but less than 4 (0<n<4).

2. The sodium secondary battery of claim 1 , wherein n is 0.2 or more but 3.8 or less (0.2≦n≦3.8).

3. The sodium secondary battery of claim 1 , wherein X 1 is chlorine (Cl), and X 2 is iodine (I), and
n is 2.0 or more but 3.8 or less (2.0≦n≦3.8).

4. The sodium secondary battery of claim 1 , wherein X 1 is chlorine (Cl), and X 2 is bromine (Br), and
n is 0.2 or more but 3.8 or less (0.2≦n≦3.8).

5. The sodium secondary battery of claim 1 , wherein M is boron, aluminum, gallium, or indium.

6. The sodium secondary battery of claim 1 , wherein the molten salt electrolyte has a melting point of 150° C. or less.

7. The sodium secondary battery of claim 1 , wherein the molten salt electrolyte further contains an electrode active material made of a sodium halide salt.

8. The sodium secondary battery of claim 1 , wherein the anode contains a sodium metal or a sodium alloy.

9. The sodium secondary battery of claim 1 , wherein it has an operation temperature of 100 to 200° C.

Assignees

• Sk Innovation Co Ltd
• Ceram Inc

Inventors

• Chae Je Hyun
• Koh Won Sang
• Lee Seung Ok
• Park Dai In
• Kim Jeong Soo
• Bhavaraju Sai
• Robins Mathew Richard
• Eccleston Alexis L
• Joshi Ashok V

Classifications

• H01M2300/0054

  Halogenides · CPC title

• H01M4/381 Primary

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

• H01M10/399 Primary

  Cells with molten salts · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M10/054

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