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AssigneeNanotek Instruments, Inc.
InventorsGuorong Chen, Aruna Zhamu, Bor Z. Jang, Zhenning Yu
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A nano graphene-enabled vanadium oxide composite composition for use as a lithium battery cathode active material, wherein the composite composition is formed of one or a plurality of graphene, graphene oxide, or graphene fluoride sheets or platelets and a plurality of nano-particles, nano-rods, nano-wires, nano-sheets, and/or nano-belts of a vanadium oxide with a size smaller than 100 nm (preferably smaller than 20 nm, further preferably smaller than 10 nm, and most preferably smaller than 5 nm), and wherein the graphene, graphene oxide, or graphene fluoride (having a thickness <20 nm, preferably <10 nm, further preferably <5 nm, and being most preferably of single-layer or less than 5 layers) is in an amount of from 0.01% to 50% (preferably <10%) by weight based on the total weight of graphene, graphene oxide or graphene fluoride and the vanadium oxide combined. This electrode material exhibits an unprecedented combination of outstanding specific capacity, capacity retention, and rate capability characteristics.
A nano graphene-enabled vanadium oxide composite composition for use as a lithium battery cathode active material, wherein said composite composition is formed of one or a plurality of graphene fluoride or graphene oxide sheets or platelets and a plurality of nano-particles, nano-rods, nano-wires, nano-tubes, nano-sheets, and/or nano-belts of a vanadium oxide with a size smaller than 100 nm, wherein said graphene fluoride or graphene oxide sheets or platelets have a thickness in the range of 0.34 nm-20 nm and are in an amount of from 0.01% to 50% by weight based on the total weight of graphene fluoride or graphene oxide and the vanadium oxide combined, and wherein said vanadium oxide is selected from the group consisting of VO2, LixVO2, V2O5, LixV2O5, V3O8, LixV3O8, LixV3O7, V4O9, LixV4O9, V6O13, LixV6O13, their doped versions, their derivatives, and combinations thereof, wherein 0.1<x<5.
A lithium battery cathode comprising multiple particles of nano graphene-enabled vanadium oxide composite composition as a cathode active material, wherein said composite composition is formed of one or a plurality of graphene, graphene fluoride, or graphene oxide sheets or platelets and a plurality of nano-particles, nano-rods, nano-wires, nano-tubes, nano-sheets, and/or nano-belts of a vanadium oxide with a size smaller than 100 nm, wherein said graphene, graphene fluoride, or graphene oxide sheets or platelets have a thickness in the range of 0.34 nm-20 nm and are in an amount of from 0.01% to 50% by weight based on the total weight of graphene, graphene fluoride, or graphene oxide and the vanadium oxide combined, and wherein said composite composition is prepared by precipitating vanadium oxide from a water or solvent solution containing a vanadium oxide or a vanadium oxide precursor and agraphene, graphene fluoride, or graphene oxide sheet dissolved or dispersed therein, and wherein said vanadium oxide and graphene, graphene oxide, or graphene fluoride sheets are mutually bonded or agglomerated into a composite particulate containing both embracing and internal sheets of graphene, graphene fluoride, or graphene oxide with at least a graphene, graphene fluoride, or graphene oxide sheet embracing said particulate, and wherein said particulate has an electrical conductivity no less than 10−4 S/cm and wherein said multiple composite particulates are packed together with graphene sheets forming a three-dimensional electron-conducting pathway.
Dependencies are inferred from the claim text.