Sodium transition metal oxide electroactive compounds

Patent metadata

Field	Value
Publication number	US-9905852-B2
Application number	US-201514839524-A
Country	US
Kind code	B2
Filing date	Aug 28, 2015
Priority date	Aug 29, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

Embodiments related to electroactive compounds, their methods of manufacture, and use are described. In one embodiment, an electroactive compound may include Na(Fe a X 1-a )O 2 . X includes at least one of Ti, V, Cr, Mn, Co, Ni, and a is greater than 0 and less than or equal to 0.4. In another embodiment, an electroactive compound may include Na(Mn w Fe x Co y Ni z )O 2 , where w, x, y, and z are greater than 0. Further, a sum of w, x, y, and z is equal to 1 in some cases.

First claim

What is claimed is:

1. An electroactive compound comprising:
Na(Fe a X 1-a )O 2 , wherein X includes at least Co, wherein a is greater than 0 and less than or equal to 0.25, and wherein the compound exhibits a hexagonal O3 layered intercalated structure.

2. The electroactive compound of claim 1 , wherein a is greater than or equal to 0.2.

3. The electroactive compound of claim 2 , wherein X includes equal portions of Mn, Co, and Ni.

4. The electroactive compound of claim 3 , wherein X includes equal portions of Mn, Co, and Ni.

5. The electroactive compound of claim 1 , wherein an initial discharge capacity of the electroactive compound is greater than or equal to 170 mAh/g and less than or equal to 200 mAh/g.

6. The electroactive compound of claim 1 , wherein a specific energy density of the electroactive compound is greater than or equal to 500 Wh/kg and less than or equal to 650 Wh/kg.

7. An electroactive compound comprising:
Na(Mn w Fe x Co y Ni z )O 2 , wherein w, x, y, and z are each greater than 0, wherein a sum of w, x, y, and z is equal to 1, wherein x is greater than 0 and less than ⅓, and wherein the compound exhibits a hexagonal O 3 layered intercalated structure.

8. The electroactive compound of claim 7 , wherein x is greater than or equal to 0.1 and less than or equal to ⅓.

9. The electroactive compound of claim 8 , wherein x is greater than or equal to 0.2 and less than or equal to ⅓.

10. The electroactive compound of claim 7 , wherein w, y, and z are each between or equal to 0.1 and 0.5.

11. The electroactive compound of claim 7 , wherein an initial discharge capacity of the electroactive compound is greater than or equal to 170 mAh/g and less than or equal to 200 mAh/g.

12. The electroactive compound of claim 7 , wherein a specific energy density of the electroactive compound is greater than or equal to 500 Wh/kg and less than or equal to 650 Wh/kg.

13. The composition of claim 7 , wherein x is less than or equal to 0.25.

14. A composition, comprising Na(Mn 1/4 Fe 1/4 Co 1/4 Ni 1/4 )O 2 , wherein the compound exhibits a hexagonal 03 layered intercalated structure.

15. A composition, formed by mixing stoichiometric amounts of Mn 2 O 3 , Fe 2 O 3 , CO 3 O 4 , NiO, and NaCoO 3 , wherein the composition exhibits a hexagonal 03 layered intercalated structure, wherein the composition comprises Co, and wherein Fe makes up greater than 0 and less than ⅓ of a transition metal content of the composition.

16. The composition of claim 15 , wherein Fe makes up less than or equal to ¼ of the transition metal content of the composition.

Assignees

• Massachusetts Inst Technology

Inventors

• Li Xin
• Ceder Gerbrand

Classifications

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C01G45/1221

  Manganates or manganites with trivalent manganese, tetravalent manganese or mixtures thereof · CPC title

• H01M4/505

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

• C01G53/50

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title