High capacity sodium-ion battery positive electrode material

Patent metadata

Field	Value
Publication number	US-10916772-B2
Application number	US-201815866040-A
Country	US
Kind code	B2
Filing date	Jan 9, 2018
Priority date	Apr 5, 2017
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

A positive electrode active material for a sodium ion battery includes a sodium complex oxide of the formula Na4(M1aM21−a)2O5 having an orthorhombic crystal structure, wherein M1 and M2 are each independently Ti, Cr, Fe, Co, Ni, Mn, V, or a combination there of provided that M1 and M2 are different from each other; and 0≤a≤1.

First claim

What is claimed is:

1. A positive electrode active material for a sodium-ion battery, the positive electrode active material comprising:
a sodium complex oxide of the formula
Na 4 (M 1 a M 2 1−a ) 2 O 5

having an orthorhombic crystal structure;
wherein
M 1 and M 2 are each independently Ti, Cr, Fe, Co, Ni, combination thereof, provided that M 1 and M 2 are different from each other;
0<a<1; and
wherein a molar ratio of M 1 to M 2 is 7:1 to 1:7; and
wherein the electrode material exhibits an average voltage of 2.6 to 3.3 volts versus Na/Na + .

2. The positive electrode active material of claim 1 , wherein M 1 and M 2 comprise Fe, Co, or a combination thereof, provided that M 1 and M 2 are different from each other.

3. The positive electrode active material of claim 2 , wherein M 1 is Fe.

4. The positive electrode active material of claim 3 , wherein M 1 is Fe and M 2 is Co or Ni.

5. The positive electrode active material of claim 4 , wherein the molar ratio of M 1 to M 2 is 3:1 to 1:3.

6. The positive electrode active material of claim 2 , wherein M 1 is Co and M 2 is Cr or Ti.

7. The positive electrode active material of claim 1 , wherein the sodium complex oxide comprises Na 4 Fe 1.5 Co 0.5 O 5 , Na 4 Fe 0.75 Ni 1.25 O 5 , Na 4 Fe 1.25 Ni 0.75 O 5 , Na 4 Cr 0.75 Co 1.25 O 5 , Na 4 CrCoO 5 , Na 4 Fe 0.25 Ni 1.75 O 5 , Na 4 Ti 0.5 Co 1.5 O 5 , or a combination thereof.

8. The positive electrode active material of claim 1 , wherein in the crystal structure of the sodium complex oxide, sodium and M 1 are each independently coordinated by oxygen in a square pyramidal or trigonal pyramidal geometry.

9. The positive electrode active material of claim 1 , wherein the sodium complex oxide has an Fddd space group.

10. The positive electrode active material of claim 1 , wherein the electrode material exhibits a specific capacity of greater than 360 milliampere-hours per gram.

11. The positive electrode active material of claim 1 , having a major peak at a diffraction angle of 19 to 22 degrees 2θ when analyzed by powder X-ray diffraction using Cu Kα radiation.

12. The positive electrode active material of claim 1 , having a major peak at a diffraction angle of 32 to 35 degrees 2θ when analyzed by powder X-ray diffraction using Cu Kα radiation.

13. The positive electrode active material of claim 1 , having a major peak at a diffraction angle of 36 to 39 degrees 2θ when analyzed by powder X-ray diffraction using Cu Kα radiation.

14. The positive electrode active material of claim 1 , having a major peak at a diffraction angle of 40 to 43 degrees 2θ when analyzed by powder X-ray diffraction using Cu Kα radiation.

15. A sodium ion battery comprising the positive electrode active material of claim 1 .

16. A sodium ion battery comprising:
a positive electrode comprising the positive electrode active material of claim 1 ;
a negative electrode; and
an electrolyte between the positive electrode and negative electrode.

17. The sodium ion battery of claim 16 , further comprising a separator disposed between the positive electrode and the negative electrode.

18. A method of manufacturing the positive electrode active material for a sodium-ion battery of claim 1 , the method comprising:
heat treating a sodium source and a material comprising M 1 and M 2 , wherein M 1 and M 2 are each independently Ti, Cr, Fe, Co, Ni, provided that M 1 and M 2 are different from each other, to manufacture the positive electrode active material;
wherein the heat treating comprises a first heat treatment at a first temperature and a second, subsequent heat treatment at a second temperature that is higher than the first temperature.

19. A method of manufacturing a sodium-ion battery, the method comprising:
providing the positive electrode active material of claim 1 ;
providing a negative electrode;

and disposing an electrolyte between the positive electrode and negative electrode to manufacture the sodium-ion battery.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Aryanpour Masoud
• Ryu Young-Gyoon
• Wang Yan

Classifications

• 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

• C01P2002/72

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

• C01G49/0027

  containing one alkali metal · CPC title

• H01M10/054

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

• H01M4/485

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