Cathode compositions for sodium-ion batteries and methods of making same

Patent metadata

Field	Value
Publication number	US-10038187-B2
Application number	US-201414781738-A
Country	US
Kind code	B2
Filing date	Mar 27, 2014
Priority date	Apr 4, 2013
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A cathode composition for a sodium-ion battery. The cathode composition may have the formula NaCr 1-x M x O 2 , where M is one or more metal elements, and x is greater than 0 and less than or equal to 0.5.

First claim

What is claimed is:

1. A cathode composition for a sodium-ion battery, the composition having the formula:
NaCr 1-x M x O 2 ,
wherein M is one or more metal elements;
wherein x is greater than 0 and less than or equal to 0.5;
wherein the cathode composition comprises an O3 phase having a grain size that is less than 42.5 nanometers, and a secondary phase consisting of a metal oxide or a sodium transition metal oxide.

2. The cathode composition of claim 1 , wherein x is less than or equal to 0.25.

3. The cathode composition of any one of claims 1 - 2 , wherein M comprises aluminum, a transition metal, or combinations thereof.

4. The cathode composition of any one of claims 1 - 3 , wherein M comprises aluminum, titanium, vanadium, chromium, manganese, cobalt, nickel, copper, zirconium, niobium, molybdenum, tungsten or combinations thereof.

5. The cathode composition of any one of claims 1 - 4 , wherein M comprises aluminum, vanadium, manganese, titanium, or combinations thereof.

6. A sodium-ion electrochemical cell comprising:
the cathode composition of claim 1 ;
an anode; and
an electrolyte.

7. An electronic device comprising an electrochemical cell according to claim 6 .

8. A method of making a cathode composition comprising:
combining precursors of a composition having the formula:
NaCr 1-x M x O 2 ; and

heating the precursors to form the composition;
wherein M is one or more metal elements;
wherein x is greater than 0 and less than or equal to 0.5; and
wherein the cathode composition comprises an O3 phase having a grain size that is less than 42.5 nanometers, and a secondary phase consisting of a metal oxide or a sodium transition metal oxide.

9. The method according to claim 8 , wherein the step of combining the precursors comprises mechanically milling the precursors.

Assignees

• 3M Innovative Properties Co

Inventors

• Obrovac Mark N
• Hatchard Timothy D
• Iaboni Douglas S

Classifications

• C01G45/1228

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

• C01G45/006

  Chemistry & Metallurgy · mapped topic

• C01G51/42

  containing alkali metals, e.g. LiCoO2 · CPC title

• C01G37/14

  Chromates; Bichromates · CPC title

• C01G37/006

  Compounds containing chromium, with or without oxygen or hydrogen, and containing two or more other elements · CPC title