Advanced lithium (LI) ion and lithium sulfur (LI S) batteries
This disclosure provides a lithium (Li) ion battery that includes an anode, a cathode positioned opposite to the anode, a porous separator positioned between the anode and the cathode, and a liquid electrolyte in contact with the anode and the cathode. The anode includes an electrically conductive substrate. A first film is deposited on the electrically conductive substrate. The first film includes a first concentration of carbon particles in contact with each other and defines a first electrical conductivity for the first film. Each of the carbon particles includes a plurality of aggregates formed of few layer graphene sheets. The plurality of aggregates form a porous structure configured to undergo a lithiation, which can include any one or more of an intercalation operation or a plating operation. The anode and the cathode can include an electroactive material. The porous structure can provide conduction between the few layer graphene sheets.
1. A lithium (Li) ion battery comprising:
an anode;
a cathode positioned opposite to the anode;
a porous separator positioned between the anode and the cathode; and
a liquid electrolyte in contact with the anode and the cathode, the anode comprising:
an electrically conductive substrate; and
a carbon-based scaffold formed on the electrically conductive substrate, the carbon-based scaffold including a plurality of carbon aggregates formed of few layer graphene (FLG) joined with one another,
wherein a first group of the carbon aggregates has a relatively low electrical conductivity, a second group of the carbon aggregates has a relatively high low electrical conductivity, and the carbon-based scaffold comprises a porous structure containing intercalated or plated lithium.
2. The Li ion battery of claim 1 , wherein the plurality of pores is configured to confine an electroactive material.
3. The Li ion battery of claim 1 , wherein the porous structure is configured to provide electrical conduction between contact points of at least two or more graphene layers within the FLG.
4. The Li ion battery of claim 1 , wherein the porous structure includes one or more voids containing electrodeposited lithium.
5. The Li ion battery of claim 1 , wherein the porous structure is configured to receive the liquid electrolyte.
6. The Li ion battery of claim 5 , wherein the liquid electrolyte is configured to facilitate transport of a plurality of Li ions within the porous structure.
7. The Li ion battery of claim 1 , further comprising an electroactive material residing in the plurality of pores.
8. The Li ion battery of claim 7 , wherein the electroactive material has a specific surface area (SSA) between approximately 1,635 m 2 /g and 2,675 m 2 /g.
9. The Li ion battery of claim 7 , wherein the electroactive material comprises any one or more of pre-lithiated few layer graphene (FLG), pristine graphene, graphene oxide, reduced graphene oxide, graphene fluoride, graphene chloride, graphene bromide, graphene iodide, hydrogenated graphene, nitrogenated graphene, boron-doped graphene, nitrogen doped graphene, chemically functionalized graphene, physically or chemically activated or etched versions thereof, sulfur-doped graphene, or electrically conductive polymer coated or grafted versions thereof.
10. The Li ion battery of claim 1 , wherein the porous structure comprises an active lithium intercalating structure incorporating silicon, wherein the active lithium intercalating structure has a specific capacity of between approximately 730-3,600 mAh/g.
11. The Li ion battery of claim 1 , wherein the electrically conductive substrate is a current collector.