Nanoporous Silicon Network Thin Films as Anodes for Lithium Ion Batteries
First Claim
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1. A composition of matter comprising:
- a nanoporous silicon (Si) network thin film.
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Abstract
Various embodiments of the invention describe nanoporous silicon (Si) network thin films with controllable porosity and thickness that are fabricated by a robust and scalable electrochemical process, and then released from Si wafers and transferred to flexible and conductive substrates. These nanoporous Si network thin films serve as high performance Li-ion battery electrodes, with an initial discharge capacity of 2570 mA h g−1, above 1000 mA h g−1 after 200 cycles without any electrolyte additives.
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Citations
28 Claims
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1. A composition of matter comprising:
a nanoporous silicon (Si) network thin film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electrode comprising:
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a current collector; and a nanoporous silicon (Si) network thin film in contact with the current collector.
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13. A battery comprising:
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an anode comprising a current collector and a nanoporous silicon (Si) network thin film in contact with the current collector; and a cathode. - View Dependent Claims (14, 15, 16)
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17. A method of manufacturing a nanoporous silicon (Si) network thin film comprising:
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providing a doped p-type silicon substrate; providing a constant current power source in electrical contact with the doped p-type silicon substrate; etching the doped p-type silicon substrate in a hydrofluoric (HF) acid and ethanol (EtOH) solution for a predetermined etching time period at a predetermined etching electrical current and voltage to produce the nanoporous Si network thin film; and transferring the nanoporous Si network thin film to a receiver substrate. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification