Electrode material for a lithium cell

Patent metadata

Field	Value
Publication number	US-9819011-B2
Application number	US-201414570562-A
Country	US
Kind code	B2
Filing date	Dec 15, 2014
Priority date	Dec 16, 2013
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

An electrode material for an electrochemical energy store, in particular for a lithium cell, includes at least one first lithiatable active material, which is based on a transition metal oxide, and at least one second lithiatable active material, which is based on a doped transition metal oxide, the doped transition metal oxide of the second lithiatable active material being doped with at least one redox-active element. Also described is a method for manufacturing an electrode of this type.

First claim

What is claimed is:

1. An electrode material for an electrochemical energy store, comprising:
at least one first lithiatable active material which is based on a transition metal oxide; and
at least one second lithiatable active material, which is based on a doped transition metal oxide;
wherein the doped transition metal oxide of the second lithiatable active material is doped with at least one redox-active element, and
wherein the electrode material is based on the general chemical formula x(Li(Ni, Co, Mn)O 2 ):1-x(Li 2 Mn 1-z M z O 3 ), where x and z are respectively in a range of greater than 0, to smaller than 1, and M is the redox-active element.

2. An electrode material for an electrochemical energy store, comprising:
at least one first lithiatable active material which is based on a transition metal oxide; and
at least one second lithiatable active material, which is based on a doped transition metal oxide,
wherein the doped transition metal oxide of the second lithiatable active material is doped with at least one redox active element,
wherein the first lithiatable active material is based on the general chemical formula Li(Ni x Co y Mn 1-x-y )O 2 , where x is in a range of greater than 0 to less than or equal to 1, and y is in a range of greater than 0 to less than or equal to 1, and
wherein the second lithiatable active material is based on a doped manganese-oxide is based on the general chemical formula Li 2 Mn 1-z M z O 3 , where z is in a range of greater than 0 to less than 1, and M is the redox-active element.

3. The electrode material of claim 1 , wherein the second lithiatable active material is based on a doped manganese-oxide.

4. The electrode material of claim 1 , wherein the redox-active material has at least an ionic radius which is within the range of greater than or equal to 50 pm to less than or equal to 80 pm.

5. The electrode material of claim 1 , wherein the redox-active element exhibits a small change of the ionic radius during at least two subsequent oxidation stages.

6. The electrode material of claim 1 , wherein the redox-active element is also a transition metal.

7. The electrode material of claim 1 , wherein the at least one redox-active element includes niobium, tungsten, or molybdenum.

8. The electrode material for an electrochemical energy store, comprising:
an electrode material which is obtainable via synthesis of at least one first lithiatable active material, which is based on a transition metal oxide, having at least one second lithiatable active material, which is based on a doped transition metal oxide;
wherein the doped transition metal oxide of the second lithiatable active material is doped with at least one redox-active element, and
wherein the electrode material is based on the general chemical formula x(Li(Ni, Co, Mn)O 2 ):1-x(Li 2 Mn 1-z M z O 3 ), where x and z are respectively in a range of greater than 0, to smaller than 1, and M is the redox-active element.

9. An electrode, comprising:
at least one electrode material for an electrochemical energy store, including:
at least one first lithiatable active material which is based on a transition metal oxide; and
at least one second lithiatable active material, which is based on a doped transition metal oxide;
wherein the doped transition metal oxide of the second lithiatable active material is doped with at least one redox-active element, and
wherein the electrode material is based on the general chemical formula x(Li(Ni, Co, Mn)O 2 ):1-x(Li 2 Mn 1-z M z O 3 ), where x and z are respectively in a range of greater than 0, to smaller than 1, and M is the redox-active element.

10. The electrode material of claim 1 , wherein the electrochemical energy store includes a lithium cell.

11. An electrode material for an electrochemical energy store, comprising:
at least one first lithiatable active material which is based on a transition metal oxide; and
at least one second lithiatable active material, which is based on a doped transition metal oxide;
wherein the doped transition metal oxide of the second lithiatable active material is doped with at least one redox-active element, and
wherein the second lithiatable active material is based on a doped manganese-oxide is based on the general chemical formula Li 2 Mn 1-z M z O 3 , where z is in a range of greater than 0 to less than 1, and M is the redox-active element.

12. The electrode material of claim 11 , wherein z is in a range of greater than or equal to 0.01 to less than or equal to 0.3.

13. The electrode material of claim 11 , wherein z is in a range of greater than or equal to 0.01 to less than or equal to 0.2.

14. The electrode material of claim 1 , wherein the redox-active material has at least an ionic radius which is within the range of than or equal to 60 pm to less than or equal to 70 pm.

15. The electrode material of claim 1 , wherein the redox-active material has at least an ionic radius which is within the range of greater than or equal to 65 pm to less than or equal to 69 pm.

16. The electrode material of claim 1 , wherein the redox-active element exhibits a small change of the ionic radius during at least two subsequent oxidation stages, in particular the redox-active material exhibiting in at least two subsequent oxidation stages a small change of the ionic radius which is respectively in a range of greater than or equal to 50 pm to less than or equal to 80 pm.

17. The electrode material of claim 1 , wherein the redox-active element exhibits a small change of the ionic radius during at least two subsequent oxidation stages, in particular the redox-active material exhibiting in at least two subsequent oxidation stages a small change of the ionic radius which is respectively in a range of greater than or equal to 59 pm to less than or equal to 70 pm.

18. An electrode material for an electrochemical energy store, comprising:
at least one first lithiatable active material which is based on a transition metal oxide; and
at least one second lithiatable active material, which is based on a doped transition metal oxide;
wherein the doped transition metal oxide of the second lithiatable active material is doped with at least one redox-active element, and
wherein the at least one redox-active element includes niobium(IV).

19. The electrode material of claim 8 , wherein the electrochemical energy store includes a lithium cell.

20. The electrode of claim 9 , wherein the electrode is a cathode.

21. The electrode of claim 9 , wherein the electrode material further includes a conductive additive.

22. The electrode of claim 9 , wherein the electrode material further includes a binder.

23. The electrode of claim 9 , wherein:
the electrode material further includes at least one of (a) a conductive additive and (b) a binder;
at least one of the first lithiatable active material, the second lithiatable active material, the conductive additive, and the binder is dry pressed or solvent dispersed.

24. The electrode of claim 9 , wherein:
the electrode material further includes at least one of (a) a conductive additive and (b) a binder;
at least one of the first lithiatable active material, the second lithiatable active material, the conductive additive, and the binder is solvent dispersed and spread on an aluminum foil.

25. The electrode of claim 9 , wherein:
the electrode is a cathode;
the electrode material further includes at least one of

Assignees

• Bosch Gmbh Robert

Inventors

• Eckl Thomas
• Marusczyk Anika
• Rolff Malte
• Kerkamm Ingo

Classifications

• H01M4/364

  as mixtures · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M4/0404

  by coating on electrode collectors · 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

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