SILICON-GRAPHENE NANOCOMPOSITES FOR ELECTROCHEMICAL APPLICATIONS
First Claim
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1. A nanographitic composite for use as an anode in a lithium ion battery, comprising:
- particles of an electroactive material; and
a coating layer comprising a plurality of graphene nanoplatelets having a thickness of 0.34 nm to 50 nm and a lateral dimension of less than 900 nm, whereinthe electroactive particles have a lateral dimension that is larger than the lateral dimension of the graphene nanoplatelets, andthe graphene nanoplatelets coat at least a portion of the nanoscale particles to form a layer made up of overlapping graphene nanoplatelets.
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Abstract
A nanographitic composite for use as an anode in a lithium ion battery includes nanoscale particles of an electroactive material; and a plurality of graphene nanoplatelets having a thickness of 0.34 nm to 5 nm and lateral dimensions of less than 900 nm, wherein the electroactive particle has an average particle size that is larger than the average lateral dimension of the graphene nanoplatelets, and the graphene nanoplatelets coat at least a portion of the nanoscale particles to form a porous nanographitic layer made up of overlapping graphene nanoplatelets.
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Citations
65 Claims
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1. A nanographitic composite for use as an anode in a lithium ion battery, comprising:
- particles of an electroactive material; and
a coating layer comprising a plurality of graphene nanoplatelets having a thickness of 0.34 nm to 50 nm and a lateral dimension of less than 900 nm, wherein the electroactive particles have a lateral dimension that is larger than the lateral dimension of the graphene nanoplatelets, and the graphene nanoplatelets coat at least a portion of the nanoscale particles to form a layer made up of overlapping graphene nanoplatelets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
- particles of an electroactive material; and
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36. A method of making a nanocomposite suitable for use in a lithium ion battery, comprising:
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introducing an electroactive particle powder into a high energy dry mill, wherein the particles are of a micron-scale dimension; introducing a graphite particle powder into the high energy dry mill, wherein the particles are of a micron-scale dimension; and milling the electroactive particle powder and the graphite particle powder, to exfoliate the graphite and reduce the particle size of the electroactive particle to less than 3 um and reduce the particle size of the graphite particle to less than 900 nm; wherein the exfoliated size-reduced graphite coats the surface of the sized-reduced electroactive particle, and wherein the resultant nanocomposite has a bulk density of greater than 0.50 g/cm3.
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37. An electrode material comprising nanographene platelets and an electroactive material wherein the nanographene platelets are covalently bonded to the electro active material by pi bonds or partial pi bonds.
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38. A nanocomposite prepared by:
the reaction of nanographitic platelets having a thickness of 0.34 nm to 50 nm and lateral dimensions of less than 900 nm, with electroactive particles, wherein the electroactive particle has an lateral dimension that is larger than a lateral dimension of the nanographitic platelets.
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39. A nanographitic composite for use as an anode in a lithium ion battery, comprising:
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a plurality of composite particles comprising; an electroactive particle; a coating layer comprising an inner layer of graphene nanoplatelets that are tightly bound to the electroactive particle and an outer layer of graphene nanoplatelets that interact loosely with the inner layer of graphene nanoplatelets, wherein the nanographitic platelets covers at least a portion of the nanoscale particle to form a nanographitic layer. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
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Specification