High energy density olivine-based cathode materials

Patent metadata

Field	Value
Publication number	US-12230797-B2
Application number	US-202217824259-A
Country	US
Kind code	B2
Filing date	May 25, 2022
Priority date	May 25, 2022
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

A cathode active material includes a lithium manganese (Mn) iron (Fe) phosphate, wherein a mol ratio of Mn:Fe is from about 3:7 to about 9:1, the lithium manganese iron phosphate is an olivine structure, and the Mn and Fe in the olivine are present in an partially ordered or partially disordered sublattice.

First claim

What is claimed is:

1. A cathode active material comprising a lithium manganese (Mn) iron (Fe) phosphate and further comprising a lithium metal phosphate that is Li 0-2 CrP 2 O 7 , LiVPO 5 , Li 0-1 VP 2 O 7 , Li 1-2 CoP 2 O 7 , or a combination of any two or more thereof, the lithium metal phosphate exhibiting a voltage that is greater than or equal to that of LiFePO 4 and less than or equal to that of LiMnPO 4 and an oxygen evolution that is less than or equal to LiFePO 4 , wherein the lithium manganese iron phosphate has a mol ratio of Mn:Fe is from about 3:7 to about 9:1, the lithium manganese iron phosphate is an olivine structure, and the Mn and Fe in the olivine structure are present in an partially ordered sublattice or partially disordered sublattice.

2. The cathode active material of claim 1 , wherein the lithium metal phosphate comprises Li 0-2 CrP 2 O 7 , Li 1-2 CoP 2 O 7 , or a combination thereof.

3. The cathode active material of claim 1 , wherein the lithium metal phosphate comprises LiVPO 5 , Li 0-1 VP 2 O 7 , or a combination thereof.

4. The cathode active material of claim 1 further comprising a lithium metal oxide of formula LiM′O 2 , wherein M′ is Ni, Co, Mn, Al, Fe, or Cu.

5. The cathode active material of claim 1 , wherein the partially ordered or partially disordered sublattice comprises a mixture of partial ordering within the lattice.

6. The cathode active material of claim 1 , wherein the partially ordered or partially disordered sublattice comprises a partially disordered solid solution.

7. The cathode active material of claim 1 , wherein the partially ordered or partially disordered sublattice comprises weak phase separation at the atomic scale.

8. The cathode active material of claim 1 , wherein the lithium metal phosphate comprises LiVPO 5 .

9. An electrochemical cell comprising a cathode comprising the cathode active material of claim 1 .

10. The electrochemical cell of claim 9 , wherein the cathode active material comprises Li 0-2 CrP 2 O 7 , Li 1-2 CoP 2 O 7 , or a combination thereof.

11. The electrochemical cell of claim 9 , wherein the cathode active material comprises LiVPO 5 , Li 0-1 VP 2 O 7 , or a combination thereof.

12. The electrochemical cell of claim 9 , wherein the cathode active material comprises LiVPO 5 .

13. A cathode active material comprising a lithium metal phosphate blended with LiFePO 4 , LiMnPO 4 , or a mixture thereof, the lithium metal phosphate comprising Li 0-2 CrP 2 O 7 , LiVPO 5 , Li 1-2 CoP 2 O 7 , or a combination of any two or more thereof, and exhibiting a voltage that is greater than or equal to that of LiFePO 4 and less than or equal to that of LiMnPO 4 and an oxygen evolution that is less than or equal to LiFePO 4 .

14. The cathode active material of claim 13 , wherein the lithium metal phosphate comprises Li 0-2 CrP 2 O 7 , Li 1-2 CoP 2 O 7 , or a combination thereof.

15. The cathode active material of claim 13 , wherein the lithium metal phosphate comprises LiVPO 5 , or a combination thereof.

16. The cathode active material of claim 13 , wherein the lithium metal phosphate comprises LiVPO 5 .

17. An electrochemical cell comprising a cathode comprising the cathode active material of claim 13 .

18. The electrochemical cell of claim 17 , wherein the lithium metal phosphate comprises Li 0-2 CrP 2 O 7 , Li 1-2 CoP 2 O 7 , or a combination thereof.

19. The electrochemical cell of claim 17 , wherein the lithium metal phosphate comprises LiVPO 5 , or a combination thereof.

20. The electrochemical cell of claim 17 , wherein the lithium metal phosphate comprises LiVPO 5 .

Assignees

• Rivian Ip Holdings Llc

Inventors

• Kim Soo
• Jeong Sookyung
• Kim Sun Ung
• Kim Tae Kyoung
• Park Ki Tae

Classifications

• C01B25/45

  containing plural metal, or metal and ammonium · CPC title

• C01P2002/50

  Solid solutions · CPC title

• C01P2006/40

  Electric properties · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C01P2002/77

  by unit-cell parameters, atom positions or structure diagrams · CPC title