METHODS AND SYSTEMS FOR PRODUCING LITHIUM INTERCALATED ANODES
Embodiments of the present disclosure generally relate to battery technology, and more specifically, methods and systems for preparing lithium anodes. In one or more embodiments, a method for producing a lithium intercalated anode includes introducing a sacrificial substrate containing lithium films and an anode substrate containing graphite into a processing region within a chamber. The method also includes combining the sacrificial and anode substrates overlapping one another around a rewinder roller, rotating the rewinder roller to wind the sacrificial and anode substrates together to produce a rolled anode-sacrificial substrate bundle during a winding process. The method also includes heating the sacrificial substrate, the anode substrate, and/or the rolled anode-sacrificial substrate bundle while rotating the rewinder roller and applying a force to the rolled anode-sacrificial substrate bundle via an idle roller during the winding process.
1 . A method of forming a lithium intercalated anode, comprising:
introducing a sacrificial substrate into a processing region within a chamber, wherein the sacrificial substrate comprises a base foil having an upper surface opposite a lower surface and a lithium coating disposed on the upper and lower surfaces;
introducing an anode substrate comprising graphite into the processing region within the chamber;
combining the sacrificial substrate and the anode substrate overlapping one another around a rewinder roller within the processing region during a rolling process;
rotating the rewinder roller to wind the sacrificial substrate and the anode substrate together to produce a rolled anode-sacrificial substrate bundle while continuing to introduce the sacrificial substrate and the anode substrate into the processing region during the rolling process;
heating the sacrificial substrate, the anode substrate, and/or the rolled anode-sacrificial substrate bundle while rotating the rewinder roller during the rolling process; and
applying a force to the rolled anode-sacrificial substrate bundle via an idle roller during the rolling process.
2 . The method of claim 1 , further comprising:
transferring at least a portion of the lithium metal from the sacrificial substrate to the anode substrate;
absorbing the lithium metal into the anode substrate to produce a lithium intercalated anode substrate; and
maintaining the rolled anode-sacrificial substrate bundle under vacuum for about 2 hours to about 24 hours while producing the lithium intercalated anode substrate.
3 . The method of claim 1 , further comprising:
transferring at least a portion of the lithium metal from the sacrificial substrate to the anode substrate;
absorbing the lithium metal into the anode substrate to produce a lithium intercalated anode substrate; and
unwinding the rolled anode-sacrificial substrate bundle and separating the lithium intercalated anode substrate from the base foil of the sacrificial substrate.
4 . The method of claim 1 , wherein the processing region is maintained at a pressure in a range from about 1×10 −6 mTorr to about 1×10 −3 mTorr while combining the sacrificial substrate and the anode substrate and rotating the rewinder roller.
5 . The method of claim 1 , wherein the sacrificial substrate, the anode substrate, and/or the rolled anode-sacrificial substrate bundle are heated to a temperature of about 50° C. to about 200° C. during the rolling process.
6 . The method of claim 1 , wherein the rolled anode-sacrificial substrate bundle is heated under vacuum for a period from about 2 hours to about 36 hours by one or more infrared lamps positioned within the processing region.
7 . The method of claim 1 , further comprising:
radially moving the idle roller away from the rewinder roller as the rolled anode-sacrificial substrate bundle is produced from the sacrificial substrate and the anode substrate; while
maintaining the force applied to the rolled anode-sacrificial substrate bundle.
8 . The method of claim 1 , wherein the chamber comprises a calendaring system which comprises the idle roller, wherein the calendaring system further comprises two pivot arms, and wherein each of the pivot arms comprises a sliding slot configured to support the idle roller.
9 . The method of claim 8 , wherein the calendaring system further comprises two casters, wherein each caster is coupled on opposite ends of the idle roller, and wherein each caster is configured to travel within a respective sliding slot on each of the pivot arms.
10 . The method of claim 1 , wherein the base foil of the sacrificial substrate comprises a metal selected from copper, a copper alloy, nickel, a nickel alloy, a stainless steel alloy, alloys thereof, or any combination thereof.
11 . The method of claim 1 , wherein the base foil of the sacrificial substrate comprises a polymeric material selected from polyethylene terephthalate (PET), polypropylene (PP), copolymers thereof, elastomers thereof, or any combination thereof.
12 . The method of claim 1 , wherein the anode substrate comprises a graphite foil, a silicon-graphite material, a silicon oxide-graphite material, or any combination thereof.
13 . The method of claim 1 , wherein the rewinder roller and the processing region are both in a rewinder chamber, wherein the rewinder chamber is part of a process system further comprising a process chamber coupled to and between an unwinder chamber and the rewinder chamber.
14 . A method of forming a lithium intercalated anode, comprising:
introducing a sacrificial substrate into a processing region within a chamber, wherein the sacrificial substrate comprises a base foil having an upper surface opposite a lower surface and a lithium coating disposed on the upper and lower surfaces;
introducing an anode substrate into the processing region within the chamber;
rotating a rewinder roller within the processing region to wind the sacrificial substrate and the anode substrate together and overlapping one another around to produce a rolled anode-sacrificial substrate bundle while continuing to introduce the sacrificial substrate and the anode substrate into the processing region during a rolling process, wherein the processing region is maintained at a pressure of less than 760 Torr while producing the rolled anode-sacrificial substrate bundle;
heating the sacrificial substrate, the anode substrate, and/or the rolled anode-sacrificial substrate bundle while rotating the rewinder roller during the rolling process;
applying a force to the rolled anode-sacrificial substrate bundle via an idle roller during the rolling process;
transferring at least a portion of the lithium metal from the sacrificial substrate to the anode substrate; and
absorbing the lithium metal into the anode substrate to produce a lithium intercalated anode substrate.
15 . The method of claim 14 , wherein the processing region is maintained at a pressure in a range from about 1×10 −6 mTorr to about 1×10 −3 mTorr while producing the rolled anode-sacrificial substrate bundle.
16 . The method of claim 14 , wherein the rolled anode-sacrificial substrate bundle is heated under vacuum for a period from about 2 hours to about 36 hours by one or more infrared lamps positioned within the processing region.
17 . The method of claim 14 , further comprising:
radially moving the idle roller away from the rewinder roller as the rolled anode-sacrificial substrate bundle is produced from the sacrificial substrate and the anode substrate; while
maintaining the force applied to the rolled anode-sacrificial substrate bundle.
18 . The method of claim 14 , wherein the chamber comprises a calendaring system which comprises the idle roller, wherein the calendaring system further comprises two pivot arms, and wherein each of the pivot arms comprises a sliding slot configured to support the idle roller.
19 . The method of claim 14 , wherein the rewinder roller and the processing region are both in a rewinder chamber, and wherein the rewinder chamber is part of a process system further comprising a process chamber coupled to and between an unwinder chamber and the rewinder chamber.
20 . A process system for forming a lithium intercalated anode, comprising:
a chamber having a processing region therein and configured to maintained the processing region at a pressure in a range from about 1×10 −6 mTorr to about 1×10 −3 mTorr;
a first source coupled to the chamber and containing a sacrificial substrate comprising a base foil having an upper surface opposite a lower surface and a lithium coating disposed on the upper and lower surfaces;
a second source coupled to the chamber and containing an anode substrate comprising graphite;
a rewinder roller disposed within the processing region and configured to receive and wind together the sacrificial substrate and the anode substrate to produce a rolled anode-sacrificial substrate bundle;
a calendaring system comprising an idle roller configured to apply a force to the rolled anode-sacrificial substrate bundle; and
one or more infrared lamps contained within the processing region and positioned at the sacrificial substrate, the anode substrate, and/or the rolled anode-sacrificial substrate bundle.