GRAPHENE MATERIALS HAVING RANDOMLY DISTRIBUTED TWO-DIMENSIONAL STRUCTURAL DEFECTS
First Claim
1. A graphene-based material comprising a plurality of graphene sheets disposed in a vertical stack, wherein graphene sheets within the vertical stack comprise randomly-distributed defect pores formed by in-plane carbon vacancies.
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Accused Products
Abstract
Graphene-based storage materials for high-power battery applications are provided. The storage materials are composed of vertical stacks of graphene sheets and have reduced resistance for Li ion transport. This reduced resistance is achieved by incorporating a random distribution of structural defects into the stacked graphene sheets, whereby the structural defects facilitate the diffusion of Li ions into the interior of the storage materials.
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Citations
20 Claims
- 1. A graphene-based material comprising a plurality of graphene sheets disposed in a vertical stack, wherein graphene sheets within the vertical stack comprise randomly-distributed defect pores formed by in-plane carbon vacancies.
- 9. A lithium ion battery comprising a cathode, an anode and a non-aqueous electrolyte comprising a lithium salt disposed between the cathode and the anode, wherein the anode comprises a plurality of graphene sheets disposed in a vertical stack, and further wherein graphene sheets within the vertical stack comprise randomly-distributed defect pores formed by in-plane carbon vacancies.
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16. A method for making an electrode material, the method comprising:
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(a) exposing a suspension of exfoliated, oxidized graphene sheets to an acid at an acid concentration high enough, and an exposure time long enough, to generate defect pores formed from carbon vacancies in the oxidized graphene sheets; (b) removing the oxidized graphene sheets from the suspension; (c) reducing the oxidized graphene sheets to form a vertical stack of graphene sheets having a random distribution of defect pores distributed therein. - View Dependent Claims (17, 18, 19, 20)
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Specification