Energy storage devices including silicon and graphite
OwnerRonald A Rojeskiinventor
Life of this patent
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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.
Claims41
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 a over-layer including graphite, wherein the over-layer including graphite covers at least part of silicon, and
- support filaments in contact with the ion absorbing material, the ion absorbing material covering less than 25% of each of the support filaments;
- 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
- a substrate,
- an ion absorbing material attached to the substrate, the ion adsorbing material including silicon and a layer including graphene, and
- support filaments configured to provide a path for electrons between the substrate and the ion absorbing material, wherein the ion adsorbing material is attached to the substrate by a mesh of the support filaments;
- 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
- support filaments,
- a substrate,
- an ion absorbing material attached to the substrate and the support filaments, the ion adsorbing material including silicon and graphite, and
- an over-layer covering at least part of 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.
Dependencies are inferred from the claim text.