Chromium-doped lithium titanate as cathode material

Patent metadata

Field	Value
Publication number	US-2016141617-A1
Application number	US-201514938079-A
Country	US
Kind code	A1
Filing date	Nov 11, 2015
Priority date	Nov 13, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

A cathode material for a lithium cell, in particular a lithium-sulfur cell. To improve the rate properties of the cell, the cathode material includes a chromium-doped lithium titanate, in particular of the general chemical formula: Li 4-x Ti 5-2x Cr 3x O 12-δ , where 0<x<0.6 applies, δ denotes oxygen vacancies, and 0≦δ applies. Also described is a corresponding chromium-doped lithium titanate, a method for the manufacture thereof, and a lithium cell and/or battery equipped therewith.

First claim

What is claimed is:

1 . A cathode material for a lithium cell, comprising:
a chromium-doped lithium titanate.

2 . The cathode material of claim 1 , wherein the chromium-doped lithium titanate has the general chemical formula:
Li 4-x Ti 5-2x Cr 3x O 12-δ , where 0<x≦0.6, and where δ denotes oxygen vacancies and 0≦δ applies.

3 . The cathode material of claim 1 , wherein the cathode material also includes sulfur.

4 . The cathode material of claim 1 , wherein the cathode material also includes carbon.

5 . The cathode material of claim 2 , wherein 0<δ applies.

6 . The cathode material of claim 2 , wherein 0<δ applies, and the cathode material is free of conductive carbon.

7 . The cathode material of claim 2 , wherein δ=0 applies, and the cathode material includes carbon.

8 . The cathode material of claim 2 , wherein 0.1≦x≦0.5 applies.

9 . The cathode material of claim 1 , wherein the chromium-doped lithium titanate includes a spinel structure.

10 . The cathode material of claim 1 , wherein the chromium-doped lithium titanate is made by synthesizing a chromium-doped lithium titanate, by making a chromium-doped lithium titanate with solid-state synthesis, and calcine forming the chromium-doped lithium titanate having a spinel structure, wherein chromium is used in the solid-state synthesis.

11 . A chromium-doped lithium titanate, comprising:
a chromium-doped lithium titanate having the general chemical formula:
Li 4-x Ti 5-2x Cr 3x O 12-δ ,
where 0<x≦0.5, and where δ denotes oxygen vacancies and 0<δ applies.

12 . The chromium-doped lithium titanate of claim 11 , wherein 0.1≦x≦0.5 applies.

13 . The chromium-doped lithium titanate of claim 11 , wherein the chromium-doped lithium titanate is made by synthesizing a chromium-doped lithium titanate, by making a chromium-doped lithium titanate with solid-state synthesis, and calcine forming the chromium-doped lithium titanate having a spinel structure, wherein chromium is used in the solid-state synthesis.

14 . A method for synthesizing a chromium-doped lithium titanate, the method comprising:
making a chromium-doped lithium titanate with solid-state synthesis; and calcine forming the chromium-doped lithium titanate having a spinel structure; wherein chromium is used in the solid-state synthesis.

15 . A lithium cell and/or lithium battery, comprising:
at least one of: a cathode material for the lithium cell, including a chromium-doped lithium titanate; a chromium-doped lithium titanate having the general chemical formula:
Li 4-x Ti 5-2x Cr 3x O 12-δ ,
where 0<x≦0.5, and where δ denotes oxygen vacancies and 0<δ applies; and a chromium-doped lithium titanate made by synthesizing a chromium-doped lithium titanate, by making a chromium-doped lithium titanate with solid-state synthesis, and calcine forming the chromium-doped lithium titanate having a spinel structure, wherein chromium is used in the solid-state synthesis.

16 . The cathode material of claim 1 , wherein the lithium cell includes a lithium-sulfur cell.

17 . The cathode material of claim 2 , wherein 0.1≦x≦0.4 applies.

18 . The chromium-doped lithium titanate of claim 11 , wherein 0.1≦x≦0.4 applies.

19 . The method of claim 14 , wherein chromium is used in the solid-state synthesis at a molar ratio to titanium which is in a range from 1:2 to 1:16.

20 . The method of claim 14 , wherein chromium is used in the solid-state synthesis at a molar ratio to titanium which is in a range from 1:2 to 1:16, in particular a chromium (III) salt being used in the solid-state synthesis and/or the calcining is performed under a reducing atmosphere.

21 . The method of claim 14 , wherein the chromium-doped lithium titanate has a spinel structure.

22 . The lithium cell and/or lithium battery of claim 15 , wherein the lithium cell and/or lithium battery includes a lithium-sulfur cell and/or battery.

23 . The lithium cell and/or lithium battery of claim 15 , wherein the lithium cell and/or lithium battery includes a lithium-sulfur solid-state cell and/or battery.

Assignees

• Bosch Gmbh Robert

Inventors

• Verma Pallavi
• Eckl Thomas

Classifications

• H01M4/485 Primary

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

• H01M10/052

  Li-accumulators · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• C01G37/006

  Compounds containing chromium, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C01P2002/54

  one element only · CPC title