Aluminum trihalide-neutral ligand ionic liquids and their use in aluminum deposition
AssigneeUT-Battelle, LLC
InventorsSheng Dai, Xiao-Guang Sun
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Abstract
An ionic liquid composition comprising a complex of a trihalo aluminum (III) species with at least one organic uncharged ligand comprising a ring structure having at least three ring carbon atoms and at least one ring heteroatom selected from nitrogen and sulfur, wherein the complex is a liquid at a temperature of 100° C. or less. Methods of electroplating aluminum onto a metallic substrate using the above-described ionic liquid composition are also described.
Claims30
An ionic liquid composition comprising a complex of an aluminum trihalide species with at least one organic uncharged ligand comprising a ring structure having at least three ring carbon atoms and at least one ring heteroatom selected from nitrogen and sulfur, wherein said complex is a liquid at a temperature of 100° C. or less, and wherein said aluminum trihalide and said organic uncharged ligand are present in a molar ratio of 1.1-1.5:1 of said aluminum trihalide to said organic uncharged ligand.
A method of electroplating aluminum onto a metallic substrate, the method comprising:
- (i) contacting said metallic substrate, in the substantial absence of water, with an ionic liquid composition comprising a complex of an aluminum trihalide species with at least one organic uncharged ligand comprising a ring structure having at least three ring carbon atoms and at least one ring heteroatom selected from nitrogen and sulfur, wherein said complex is a liquid at a temperature of 100° C. or less, and wherein said aluminum trihalide and said organic uncharged ligand are present in a molar ratio of 1.1-1.5:1 of said aluminum trihalide to said organic uncharged ligand, and wherein said ionic liquid composition is in contact with an anode, and
- (ii) applying a voltage potential between the anode and said metallic substrate as cathode to produce a coating of aluminum on said metallic substrate while the metallic substrate is in contact with the ionic liquid composition.
Dependencies are inferred from the claim text.