Self assembled multi-layer nanocomposite of graphene and metal oxide materials
Nanocomposite materials having at least two layers, each layer consisting of one metal oxide bonded to at least one graphene layer were developed. The nanocomposite materials will typically have many alternating layers of metal oxides and graphene layers, bonded in a sandwich type construction and will be incorporated into an electrochemical or energy storage device.
1. An electrode comprising a nanocomposite material having at least two layers, each layer including a metal oxide layer chemically bonded directly to at least one graphene layer wherein the graphene layer has a thickness of about 0.5 nm to 50 nm, the metal oxide layers and graphene layers alternatingly positioned in the at least two layers forming a series of ordered layers in the nanocomposite material.
2. The electrode of claim 1 wherein said metal oxide is M x O y , and where M is Ti, Sn, Ni, Mn, Si, V and/or combinations thereof.
3. The electrode of claim 1 wherein said metal oxide is tin oxide.
4. The electrode of claim 1 wherein said metal oxide has a mesoporous structure.
5. The electrode of claim 1 wherein said nanocomposite material has a specific capacity of greater than about 400 mAh/g.
6. A lithium ion battery having at least two electrodes wherein at least one of said electrodes comprises an ordered nanocomposite material having at least two layers, each layer including a metal oxide layer chemically bonded to at least one graphene layer wherein the graphene layer has a thickness of about 0.5 nm to 50 nm, the metal oxide layers bonded to the graphene layers in the at least two layers to form an ordered nanocomposite material.
7. The lithium ion battery of claim 6 wherein said nanocomposite material has a specific capacity of greater than about 400 mAh/g.
8. The lithium ion battery of claim 6 wherein said layers are provided as an ordered, free standing three dimensional assembly.
9. The lithium ion battery of claim 6 , and wherein said at least one electrode also functions as a current collector.
10. An electrode comprising a nanocomposite material having at least two layers, each layer including a mesoporous metal oxide directly bonded to at least one graphene layer wherein the graphene layer has a thickness of about 0.5 nm to 50 nm, said nanocomposite material electrode characterized as a free standing structure that also functions as a current collector.
11. The electrode of claim 10 wherein said metal oxide is M x O y , and where M is selected from Ti, Sn, Ni, Mn, Si, V and/or combinations thereof.
12. The electrode of claim 6 wherein said metal oxide is tin oxide.
13. The electrode of claim 1 wherein said metal oxide has a mesoporous structure.
14. The electrode of claim 10 wherein said nanocomposite material has a specific capacity of greater than about 400 mAh/g.