Coated Cathode

Patent metadata

Field	Value
Publication number	US-2024105959-A1
Application number	US-202218263498-A
Country	US
Kind code	A1
Filing date	Jan 31, 2022
Priority date	Feb 3, 2021
Publication date	Mar 28, 2024
Grant date	—

Abstract

A coated cathode, a device including the coated cathode and methods for preparation thereof is provided. The coated cathode includes: an active material (10) for supplying and storing Li+ ions, an electrically conductive additive (12), and a coating (11), different from the active material (10), that coats surfaces of the active material (10), wherein the coating (11) comprises amorphous halogen-doped titanium oxide, and wherein the coating (11) has a thickness ranging from 1 to 20 nm.

First claim

1 . A coated cathode comprising:
an active material for supplying and storing Li + ions; an electrically conductive additive; and a coating, different from the active material, that coats surfaces of the active material, wherein the coating comprises amorphous chlorine-doped titanium oxide, wherein the coating has a thickness ranging from 1 to 20 nm, wherein the chlorine-to-titanium atomic ratio of the coating ranges from 0.04 to 0.19 when measured by Rutherford Backscatter Spectroscopy.

2 . The coated cathode according to claim 1 , wherein the active material comprises one of the following: a layered transition metal oxide, a spinel phase transition metal oxide, and a polyanionic material.

3 . The coated cathode according to claim 1 , wherein the electrically conductive additive comprises a carbon additive, a conductive polymer, a silicide, or a conductive oxide.

4 . The coated cathode according to claim 1 , wherein the coating coats surfaces of the active material and of the electrically conductive additive.

5 . The coated cathode according to claim 4 , wherein the coating on the active material and on the electrically conductive additive is conformal.

6 . The coated cathode according to claim 1 , further comprising a polymer binder, different from the electrically conductive additive, bonded to the active material and to the electrically conductive additive.

7 . A battery cell comprising:
a coated cathode according to claim 1 , in physical contact with a first electrolyte; and an anode, in physical contact with a second electrolyte, wherein the first electrolyte and the second electrolyte are the same or are different, and the battery cell is configured so that Li + ions, comprised in the first electrolyte and the second electrolyte, can move between the first electrolyte and the second electrolyte.

8 . The battery cell according to claim 7 , wherein at least one of the first electrolyte and the second electrolyte comprises a solid electrolyte.

9 . The battery cell according to claim 8 , wherein the solid electrolyte is a nanocomposite electrolyte.

10 . A method for forming a coated cathode according to claim 1 , comprising:
a) providing an active cathode material for supplying and storing Li + ions; b) depositing a coating by atomic layer deposition at a temperature ranging from 50 to 130° C., different from the active material, on exposed surfaces of the active material, wherein the coating comprises chlorine-doped titanium oxide and has a thickness ranging from 1 to 20 nm; and c) providing a conductive additive, wherein step b) is performed either after step a) and before step c) or after both steps a) and c).

11 . A method for forming the battery cell of claim 7 , comprising:
providing a coated cathode comprising: an active material for supplying and storing Li + ions, an electrically conductive additive, and a coating, different from the active material, that coats surfaces of the active material, wherein the coating comprises amorphous chlorine-doped titanium oxide, wherein the coating has a thickness ranging from 1 to 20 nm, and
wherein the chlorine-to-titanium atomic ratio of the coating ranges from 0.04 to 0.19 when measured by Rutherford Backscatter Spectroscopy;
providing an anode;
contacting the coated cathode with a first electrolyte and the anode with a second electrolyte, wherein the first electrolyte and the second electrolyte are the same or are different; and
configuring the battery cell so that Li + ions, comprised in the first electrolyte and the second electrolyte, can move between the first electrolyte and the second electrolyte.

12 . (canceled)

13 . The method according to claim 11 , wherein the active material comprises one of the following: a layered transition metal oxide, a spinel phase transition metal oxide, and a polyanionic material.

14 . The method according to claim 11 , wherein the electrically conductive additive comprises a carbon additive, a conductive polymer, a silicide, or a conductive oxide.

15 . The method according to claim 11 , wherein the coating coats surfaces of the active material and of the electrically conductive additive.

16 . The method according to claim 15 , wherein the coating on the active material and on the electrically conductive additive is conformal.

17 . The method according to claim 1 , further comprising a polymer binder, different from the electrically conductive additive, bonded to the active material and to the electrically conductive additive.

Assignees

• Imec Vzw
• Univ Leuven Kath

Inventors

• De Taeye Louis
• Vereecken Philippe

Classifications

• H01M4/628 Primary

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title

• H01M4/0426

  Sputtering · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/0402 Primary

  Methods of deposition of the material · CPC title