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US 10,873,075 B2Granted
Composite anode material including particles having buffered silicon-containing core and graphene-containing shell
AssigneeNanograf Corporation
InventorsSeonbaek Ha, Cary M. Hayner, Joshua J. Lau, James McKinney, Francis Wang, Woo Hyun Chae
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Abstract
A composite anode material including an active material including a core of silicon, silicon oxide, or combination thereof encased within a buffer layer including a polymeric material, and a shell encapsulating the active material. The shell may include graphene, graphene oxide, partially reduced graphene oxide, or combinations thereof.
Claims20
A composite anode material, comprising:
- capsules comprising crumpled sheets of graphene, crumpled sheets of graphene oxide, crumpled sheets of at least partially reduced graphene oxide, or combinations thereof;
- and
- active material particles disposed within the capsules, each active material particle comprising:
- a core comprising silicon, silicon oxide, or a combination thereof;
- and
- a buffer layer at least partially surrounding the core and comprising a polymeric material or a pyrolyzed polymeric material,
- wherein each capsule defines an interior void space configured to accommodate volumetric expansion of the active material particles during charging of the composite anode material, and
- wherein the composite anode material provides a buffer matrix in which a combination of the buffer layer and the interior void space within each capsule reduce mechanical degradation of the core during lithium ion intercalation and deintercalation.
5 more elements
An electrode, comprising:
- capsules comprising crumpled sheets of graphene, crumpled sheets of graphene oxide, crumpled sheets of at least partially reduced graphene oxide, or combinations thereof;
- at least one active material particle disposed within each of the capsules, each active material particle comprising:
- a core comprising silicon, silicon oxide or combinations thereof;
- and
- a buffer layer surrounding the core and comprising a polymeric material or a pyrolyzed polymeric material;
- and
- a binder,
- wherein each capsule defines an interior void space configured to accommodate volumetric expansion of the active material particles during charging of the composite anode material, and
- wherein the composite anode material provides a buffer matrix in which a combination of the buffer layer and the interior void space within each capsule reduce mechanical degradation of the core during lithium ion intercalation and deintercalation.
6 more elements
Dependencies are inferred from the claim text.