Method for producing cathodes

Patent metadata

Field	Value
Publication number	US-9865865-B2
Application number	US-201314437553-A
Country	US
Kind code	B2
Filing date	Oct 11, 2013
Priority date	Oct 23, 2012
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

Process for producing cathodes
Process for producing cathodes comprising a cathode material comprising

(A) at least one lithiated transition metal mixed oxide,
(B) carbon in an electrically conductive modification,
(C) at least one binder,

and also

(D) at least one film,

wherein

(a) a mixture comprising lithiated transition metal mixed oxide (A), carbon (B) and binder (C) is applied to film (D),
(b) dried,
(c) compacted to such an extent that the cathode material has a density of at least 1.8 g/cm 3 to obtain a compacted blank and
(d) after compaction as per (c) thermally treated at a temperature in the range from 35° C. below the melting point or the softening point of binder (C) to a maximum of 5° C. below the melting point or the softening point of binder (C).

First claim

The invention claimed is:

1. A process for producing a cathode comprising a cathode material comprising:
(A) a lithiated transition metal mixed oxide;
(B) carbon in an electrically conductive modification;
(C) a binder; and
(D) a film, the process comprising:
(a) applying a mixture comprising a lithiated transition metal mixed oxide (A), a carbon (B) and a binder (C) to a film (D), to form a coated film;
(b) drying the coated film;
(c) compacting the coated film to such an extent that a resulting cathode material on the film has a density of at least 1.8 g/cm 3 to obtain a compacted blank; and
(d) thermally treating the compacted blank either at a temperature in the range from 35° C. below a melting point of binder (C) to a maximum of 5° C. below the melting point of binder (C) or, if the binder (C) does not have a sharp melting point, at a temperature of 35° C. below a softening point of the binder (C) to a maximum of 5° C. below the softening point of binder (C);
wherein the binder (C) is a fluorinated organic (co)polymer.

2. The process according to claim 1 , wherein a density of the cathode material is changed by not more than 10% during the thermally treating (d) of the compacted blank.

3. The process according to claim 1 , wherein the cathode material has a density of at least 2.0 g/cm 3 after the compacting (c).

4. The process according to claim 1 , wherein the cathode material has a density of not more than 3.9 g/cm 3 after compacting (c).

5. The process according to claim 1 , wherein no pressure is applied during the thermally treating (d).

6. The process according to claim 1 , wherein the mixture is applied to one or both sides of the film (D) during the applying (a).

7. The process according to claim 1 , wherein the thermally treating (d) occurs at a temperature which is in a range from 25° C. below to 5° C. below the melting point or the softening point of the binder (C).

8. The process according to claim 1 , wherein the lithiated transition metal mixed oxide (A) is a lithiated Mn-comprising spinel.

9. The process according to claim 1 , wherein the lithiated transition metal mixed oxide (A) comprises a lithiated sheet oxide comprising manganese and at least one further transition metal selected from the group consisting of cobalt and nickel.

10. The process according to claim 1 , wherein the lithiated transition metal mixed oxide (A) is a lithiated sheet oxide comprising at least 35 mol % of manganese, based on a total content of transition metals.

11. The process according to claim 1 , wherein the film (D) is a polymer film and the compacted blank is relaminated after the compacting (c) and before the thermally treating (d).

12. The process according to claim 11 , wherein the compacted blank is relaminated onto a metal foil.

Assignees

• Basf Se

Inventors

• Schroedle Simon
• Schulz-Dobrick Martin

Classifications

• H01M4/0435

  Rolling or calendering · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M4/0402

  Methods of deposition of the material · CPC title

• H01M4/043

  involving compressing or compaction · CPC title

• H01M4/505

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