Altair Nanotechnologies Inc. is an American company specializing in the development and manufacturing of energy storage systems for efficient power and energy management. Altair Nantechnologies designs advanced lithium-ion energy systems and batteries.

Altairnano's best-known product are their lithium-ion batteries, produced by Altair's Power and Energy division. The batteries have an anode made of a lithium titanate oxide formed into a spinel structure. The titanate replaces the graphite anodes of typical lithium-ion batteries. The batteries are not the only batteries to use nanomaterials, but other batteries, like those from A123 Systems generally replace the cathode rather than the anode.

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