Nanocomposite of graphene and metal oxide materials and its use in energy storage devices

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Nanocomposite materials consists of a metal oxide bonded to at least one graphene material. The graphene layer has a carbon to oxygen ratio of (20-500):1 and a surface area of 600-2630 m2/g. The metal oxide can be an oxide of Ti, Sn, Ni, Mn, V, Si, or Co, preferably titania in the form of rutile or anatase, or tin oxide. The nanocomposite materials exhibit a specific capacity of at least twice that of the metal oxide material without the graphene at a charge/discharge rate of ⪆10 C. The nanocomposite material is prepd. by providing graphene in a first suspension; dispersing the graphene with a surfactant, esp. sodium dodecyl sulfate; adding a metal oxide precursor to the dispersed graphene to form a second suspension; and pptg. the metal oxide from the second suspension onto at least one surface of the dispersed graphene to form the nanocomposite material. The nanocomposite material can be used in an energy storage device, esp. in a lithium ion battery as electrode material. [on SciFinder(R)]