Energy Storage Devices Including Silicon and Graphite
AssigneeCatalyst Power Technologies
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 nanofiber (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.
Claims24
An energy storage system comprising:
- a first electrode disposed in a first region of electrolyte and including
- a substrate, and
- an ion absorbing material attached to the substrate the ion adsorbing material including silicon and graphite;
- a separator configured to separate the first region and a second region of electrolyte;
- and
- a second electrode disposed in the second region of electrolyte, the first and second electrodes and separator configured to operate as an energy storage device.
The system of claim 7, wherein the ion adsorbing material includes nanoparticles.
An energy storage system comprising:
- a first electrode disposed in a first region of electrolyte and including
- a substrate,
- an ion absorbing material attached to the substrate, the ion adsorbing material including silicon and graphite, and
- an over-layer coating the ion absorbing material;
- a separator configured to separate the first region and a second region of electrolyte;
- and
- a second electrode disposed in the second region of electrolyte, the first and second electrodes and separator configured to operate as an energy storage device.
An energy storage system comprising:
- a first electrode disposed in a first region of electrolyte and including
- an array of support filaments,
- a substrate, and
- an ion absorbing material attached to the substrate by the support filaments, the ion adsorbing material including silicon and graphite;
- a separator configured to separate the first region and a second region of electrolyte;
- and
- a second electrode disposed in the second region of electrolyte, the first and second electrodes and separator configured to operate as an energy storage device.
Dependencies are inferred from the claim text.