Reduced-Area Current Collectors for Rechargeable Batteries
AssigneeResearch Foundation of the City University of New York
InventorsYasumasa Ito, Sanjoy Banerjee
Life of this patent
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Abstract
A novel electrode current collector design that can improve performance and extend cycle life for rechargeable batteries based on metal electrodeposition is disclosed. The novel electrode current collector has a reduced effective surface area that can help to balance efficiencies between battery electrodes and to ensure non-uniform electrodeposition of metal onto the anode current collector during charge. One result is mitigation of internal short circuits that can cause a battery to fail prematurely.
Claims19
A rechargeable battery, comprising:
- a cathode, the cathode having a first overall surface area and a first effective surface area;
- an anode current collector, the anode current collector having a second overall surface area and a second effective surface area;
- and
- an electrolyte in ionic communication with both the cathode and the anode current collector;
- wherein the second effective surface area is between about 10 and 90% of the first effective surface area.
A Ni—Zn rechargeable battery, comprising:
- a nickel oxide hydroxide or nickel oxyhydroxide cathode, the cathode having a first overall surface area and a first effective surface area;
- a perforated nickel anode current collector, the perforated nickel anode current collector having a second overall surface area and a second effective surface area;
- and
- a potassium hydroxide electrolyte in ionic communication with both the cathode and the anode current collector;
- wherein the second effective surface area is between about 10 and 90% of the first effective surface area.
A method of making a rechargeable battery, comprising:
- providing a cathode having a first overall surface area and a first effective surface area;
- providing an anode current collector, the anode current collector having a second overall surface area that is approximately the same as the first overall surface area and a second effective surface area that is between about 10 and 90% of the first effective surface area;
- and
- allowing an electrolyte solution to provide ionic communication the cathode and the anode current collector as the battery charges and discharges.
Dependencies are inferred from the claim text.