Large-Area Copper Nanofoam with Hierarchical Structure for Use as Electrode
AssigneeCellMo Materials Innovation, Inc.
InventorsGigap Han, Hyeji Park, Kicheol Hong, Heeman Choe
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Abstract
A facile method is based on a pack-cementation process using large-area copper foil instead of copper powder. By controlling a pack-cementation time and an amount of alloying element (e.g., aluminum), a hierarchical microporous or nanoporous copper can be created. When coated with tin active material, the hierarchical microporous or nanoporous copper can be used as an advanced lithium-ion battery anode. A coin-cell test exhibited a four-fold higher areal capacity (e.g., 7.4 milliamp-hours per square centimeter without any performance degradation up to 20 cycles) as compared to a traditional graphite anode.
Claims13
A method comprising:
- manufacture a precursor alloy using a pack cementation process, wherein the precursor alloy is in the form of a foil;
- dealloying the precursor alloy;
- and
- using the dealloyed precursor alloy, forming nanoscale copper struts and pores throughout a specimen;
- and
- obtaining the specimen of hierarchical microporous or nanoporous copper or full nanoporous copper.
Dependencies are inferred from the claim text.