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.
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 . 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.
13 . The method according to claim 11 , wherein the electrically conductive additive comprises a carbon additive, a conductive polymer, a silicide, or a conductive oxide.
14 . The method according to claim 11 , wherein the coating coats surfaces of the active material and of the electrically conductive additive.
15 . The method according to claim 14 , wherein the coating on the active material and on the electrically conductive additive is conformal.
16 . 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.