Substituted lithium-manganese metal phosphate

Patent metadata

Field	Value
Publication number	US-9577244-B2
Application number	US-201113575665-A
Country	US
Kind code	B2
Filing date	Jan 28, 2011
Priority date	Jan 28, 2010
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

A substituted lithium-manganese metal phosphate of formula

LiFe x Mn 1-x-y M y PO 4

in which M is a bivalent metal from the group Sn, Pb, Zn, Ca, Sr, Ba, Co, Ti and Cd and wherein: x<1, y<0.3 and x+y<1, a process for producing it as well as its use as cathode material in a secondary lithium-ion battery.

First claim

The invention claimed is:

1. A lithium-manganese metal phosphate of formula
LiFe x Mn 1-x-y M y PO 4
wherein M is a bivalent metal selected from the group consisting of Zn, Ca, and Cd, and
wherein: x<1, 0<y<0.15 and x+y<1.

2. The lithium-manganese metal phosphate according to claim 1 , wherein M is Zn or Ca.

3. The lithium-manganese metal phosphate according to claim 1 , further comprising carbon.

4. The lithium-manganese metal phosphate according to claim 3 , wherein the carbon is evenly distributed throughout the lithium-manganese metal phosphate.

5. The lithium-manganese metal phosphate according to claim 3 , wherein the carbon covers the individual particles of the lithium manganese metal phosphate.

6. The lithium-manganese metal phosphate according to claim 3 , wherein the proportion of carbon relative to the lithium manganese metal phosphate is <4 wt %.

7. Cathode for a secondary lithium-ion battery, comprising the lithium-manganese metal phosphate according to claim 1 .

8. The cathode according to claim 7 , further comprising a lithium-metal-oxygen compound.

9. The cathode according to claim 8 , wherein the lithium-metal-oxygen compound is selected from the group consisting of LiCoO 2 , LiMn 2 O 4 , LiNiO 2 , LiCoPO 4 , LiFePO 4 , LiMnPO 4 , LiMnFePO 4 , and mixtures thereof.

10. The cathode according to claim 7 , wherein the cathode is free of added conductive agents.

11. Process for producing the lithium-manganese metal phosphate according to claim 1 , the process comprising the following steps:
a) producing a mixture in aqueous solution containing at least a Li starting compound, a Mn starting compound, an Fe starting compound, a M 2+ starting compound and a PO 4 3− starting compound, until a suspension forms,
b) carrying out a dispersion or grinding treatment of the mixture and/or the suspension,
c) obtaining a lithium-manganese metal phosphate of formula LiFe x Mn 1-x-y M y PO 4 from the suspension by reaction of the suspension under hydrothermal conditions.

12. The process according to claim 11 , further comprising, in step a) or step c), adding a carbon-containing component.

13. The process according to claim 12 , further comprising mixing the lithium-manganese metal phosphate of formula LiFe x Mn 1-x-y M y PO 4 obtained in step c) with a carbon-containing component.

14. The process according to claim 11 , further comprising carrying out a drying step at a temperature of <100° C. and/or a calcining step at a temperature of >200° C.

15. The process according to claim 11 , wherein the process is carried out under hydrothermal conditions at a temperature of 100° C. to 200° C. and at a pressure of 1 bar to 40 bar vapour pressure.

16. Lithium-manganese metal phosphate produced by the process according to claim 11 .

Assignees

• Nuspl Gerhard
• Tran Nicolas
• Dollinger Jasmin
• Vogler Christian
• Johnson Matthey Plc

Inventors

• Nuspl Gerhard
• Tran Nicolas
• Dollinger Jasmin
• Vogler Christian

Classifications

• H01M4/505

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

• H01M4/625

  Carbon or graphite · CPC title

• C01B25/45 Primary

  containing plural metal, or metal and ammonium · CPC title

• H01M4/366

  as layered products · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic