Lithiated and passivated lithium ion battery anodes
An electrode material includes a lithium active material composition. The lithium active material composition includes lithium and an active anode material. The lithium active material composition is coated with a lithium ion conducting passivating material, such that the electrode material is lithiated and pre-passivated. An electrode and a battery are also disclosed. Methods of making an electrode material, electrode and battery that are lithiated and pre-passivated are also disclosed.
1. A particulate electrode material for use in forming a battery electrode, comprising a particulate lithium active material composition, the particulate lithium active material composition comprising the reaction product of lithium and an particulate active anode material, the lithium active material comprising at least one selected from the group consisting of LiC 6 , LiC 12 , LiC 18 , LiC 3 N 4 , Li x Si where 0<x<4, LiTi 2 C 3 , Li x Sn, and Li x Sb, the particulate lithium active material composition being completely coated with a lithium ion conducting passivating material having a transference number of from 0.7 to 1.0, the lithium ion conducting passivating material coating being from 1 to 100 nm thick, wherein the particulate electrode material is lithiated and pre-passivated.
2. The particulate electrode material of claim 1 , wherein the active material comprises at least one selected from the group consisting of C, Si, Sn, SnO, Sb, Mo—Sb, Cu—Sb, Cu—Sn, and TiO 2 .
3. The particulate electrode material of claim 1 , wherein the active material comprises at least one selected from the group consisting of graphite and amorphous carbon.
4. The particulate electrode material of claim 1 , wherein the lithium ion conducting passivating material comprises at least one selected from the group consisting of ethylene carbonate, propylene carbonate, fluoroethylene carbonate and vinylene carbonate.
5. The particulate electrode material of claim 1 , wherein the passivating coating comprises at least one selected from the group consisting of lithium carbonate, lithium fluoride, polycarbonates such as polyethylene oxides, poly carbonates, and copolymers thereof; and lithium alkyl carbonate salts such as lithium alkyl carbonates including lithium alkyl dicarbonate, dilithium butylene dicarbonate, and all their fluorinated counter parts sulfones, cyanides, acetonitrile, glymes (di, tri, tetraglyme) dioxolane and NMP.
6. The particulate electrode material of claim 1 , further comprising an outer reflective coating over the passivating coating.
7. The particulate electrode material of claim 6 , wherein the reflecting coating comprises gold.
8. An electrode, comprising:
a particulate electrode material, comprising a particulate lithium active material composition, wherein the lithium active material composition comprises at least one selected from the group consisting of LiC 6 , LiC 12 , LiC 18 , LiC 3 N 4 , Li x Si where 0<x<4, LiTi 2 C 3 , Li x Sn, and Li x Sb, the lithium active material composition being completely coated with a lithium ion conducting passivating material having a transference number of from 0.7 to 1.0, the lithium ion conducting passivating material coating being from 1 to 100 nm thick; and,
a binder for binding the electrode material together to form a lithiated and pre-passivated electrode.
9. The electrode of claim 8 , wherein the binder is UV curable.
10. The electrode of claim 8 , wherein the binder comprises at least one selected from the group consisting of polyvinylidene fluoride (PVDF) and ethylene propylene diene terpolymer (EPDM).
11. The electrode of claim 8 , wherein the active material comprises at least one selected from the group consisting of C, Si, Sn, SnO, and TiO 2 .
12. The electrode of claim 8 , further comprising an outer reflective coating over the passivating coating.
13. A battery, comprising:
a lithiated and pre-passivated anode comprising a particulate electrode material, comprising a particulate lithium active material composition, wherein the lithium active material composition comprises at least one selected from the group consisting of LiC 6 , LiC 12 , LiC 18 , LiC 3 N 4 , Li x Si where 0<x<4, LiTi 2 C 3 , Li x Sn, and Li x Sb, the particulate lithium active material composition being completely coated with a lithium ion conducting passivating material having a transference number of from 0.7 to 1.0, the lithium ion conducting passivating material coating being from 1 to 100 nm thick, the anode further comprising a binder and a current collector;
a cathode;
a separator; and
an electrolyte.