Hybrid Energy Storage Devices Including Surface Effect Dominant Sites
AssigneeCf Traverse LLC
InventorRonald A. Rojeski
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Abstract
A novel hybrid lithium-ion anode material based on coaxially coated Si shells on vertically aligned carbon nano fiber (CNF) arrays. The unique cup-stacking graphitic microstructure makes the bare vertically aligned CNF array an effective Li intercalation medium. Highly reversible Li+ intercalation and extraction were observed at high power rates. More importantly, the highly conductive and mechanically stable CNF core optionally supports a coaxially coated amorphous Si shell which has much higher theoretical specific capacity by forming fully lithiated alloy. Addition of surface effect dominant sites in close proximity to the intercalation medium results in a hybrid device that includes advantages of both batteries and capacitors.
Claims23
An energy storage system comprising:
- an electrolyte including one or more charge carriers;
- a conductive substrate;
- intercalation material configured to reversibly adsorb members of the charge carriers within a bulk of the intercalation material;
- and
- a binder disposed on the intercalation material and including a plurality of nanoparticles, each of the nanoparticles being configured to provide surface effect dominant sites configured to donate electrons to members of the charge carriers via faradaic interactions on surfaces of the nanoparticles.
An energy storage system comprising:
- a cathode;
- and
- an anode separated from the cathode by an electrolyte including one or more charge carriers, the anode comprising,
- an intercalation material configured to intercalate the charge carriers and to donate electrons to the charge carriers at a first reaction potential,
- a plurality of nanoparticles including surface effect dominant sites configured to donate electrons to the charge carriers at a second reaction potential, a absolute difference between the first reaction potential and the second reaction potential being less than 2.4V.
A system comprising:
- means for establishing a potential gradient at an anode of a charge storage device, the anode including an electrolyte, a plurality of surface effect dominant sites, an intercalation material and a substrate;
- means for receiving a charge carrier of the electrolyte at one of the surface effect dominant sites;
- means for receiving an electron at the charge carrier from one of the surface effect dominant sites;
- and
- means for receiving a charge carrier at the intercalation material.
Dependencies are inferred from the claim text.