SYSTEM AND METHODS FOR A PRELITHIATED ELECTRODE FOR AN ELECTROCHEMICAL CELL
Aspects of the present disclosure relate to prelithiating an electrode of an electrochemical cell to counteract lithium loss as an electrochemical cell is formed and cycled. One implementation may include a method comprising a) providing an electrode composite with lithium-ion conductivity and diffusivity, the electrode composite comprising a silicon-containing material, a carbon-based conductive additive, a solid electrolyte, and a binder; b) disposing a continuous thin layer of lithium proximate to the electrode composite; and c) pressure laminating the continuous thin layer of lithium to the electrode composite. Through the process, lithium is transferred to the solid-state electrode composite by contacting the lithium metal film with the electrode composite without the use of a liquid medium traditionally used to aid in the movement of lithium ions.
1 . A method for manufacturing a battery electrode, the method comprising:
disposing a continuous layer of lithium adjacent to an electrode composite of an electrode stack; and
pressing the continuous layer of lithium to the electrode composite to prelithiate the electrode composite with at least a portion of the continuous layer of lithium.
2 . The method of claim 1 , further comprising:
disposing a separator layer onto the electrode stack adjacent to the prelithiated electrode composite, the separator layer comprising a solid-state electrolyte.
3 . The method of claim 1 wherein pressing the continuous layer of lithium to the electrode composite comprises:
feeding the electrode stack through a calender press comprising a first roller and a second roller, the first roller oriented above the second roller and separated by a pressing spacing, the pressing spacing based on a thickness of at least one layer of the electrode stack.
4 . The method of claim 1 wherein the electrode composite comprises a silicon-containing material, a carbon-based conductive additive, a solid electrolyte, and a binder.
5 . The method of claim 1 wherein the continuous layer of lithium is pressed to the electrode composite with a pressure of about 1,500 to 100,000 psi.
6 . The method of claim 1 wherein the continuous layer of lithium is pressed to the electrode composite for a duration of between 0.01 and 60 minutes.
7 . The method of claim 1 wherein the continuous layer of lithium has a thickness in the range of 0.1 to 20 microns.
8 . The method of claim 1 wherein the continuous layer of lithium comprises a lithium alloy, the pressing of the continuous layer of lithium to the electrode composite transferring at least a portion of lithium ions of the lithium alloy to the electrode composite.
9 . The method of claim 1 , further comprising:
casting the continuous layer of lithium upon a carrier foil; and
removing the carrier foil from the continuous layer of lithium after the pressing of the continuous layer of lithium to the electrode composite.
10 . The method of claim 9 wherein when the carrier foil comprises a copper foil.
11 . The method of claim 1 wherein the continuous layer of lithium comprises a passivation layer adjacent to the electrode composite, the passivation layer remaining after pressing the continuous layer of lithium to the electrode composite.
12 . The method of claim 1 , further comprising:
monitoring a state of lithiation of the electrode composite during the pressing of the continuous layer of lithium to the electrode composite; and
adjusting, based on the monitoring of the state of lithiation of the electrode composite, a parameter of the pressing of the continuous layer of lithium to the electrode composite.
13 . A solid-state electrochemical cell comprising:
a first electrode;
a solid-state electrolyte adjacent the first electrode; and
a second electrode adjacent the solid-state electrolyte, wherein the second electrode is prelithiated by dry laminating a continuous layer of lithium to a second electrode composite.
14 . The solid-state electrochemical cell of claim 13 wherein the second electrode is dry laminated through a calender press comprising a first roller and a second roller, the first roller oriented above the second roller and separated by a pressing spacing.
15 . The solid-state electrochemical cell of claim 12 wherein at least a portion of the continuous layer of lithium is absorbed into the second electrode composite to prelithiate the second electrode.
16 . The solid-state electrochemical cell of claim 12 wherein the continuous layer of lithium has a thickness in the range of 0.1 to 20 microns before dry laminating.
17 . The solid-state electrochemical cell of claim 13 wherein the continuous layer of lithium includes a lithium alloy.
18 . The solid-state electrochemical cell of claim 13 wherein the continuous layer of lithium is positioned proximate a surface of the second electrode composite opposite a current collector.
19 . A method for manufacturing a battery electrode, the method comprising:
compressing an electrode stack comprising an electrode composite, a current collector, and a continuous layer of lithium adjacent to the electrode composite, wherein at least a portion of the continuous layer of lithium is absorbed by the electrode composite during the compression to prelithiate the electrode composite.
20 . The method for manufacturing the battery electrode of claim 19 wherein the continuous layer of lithium of the electrode stack is disposed between the electrode composite and the current collector.
21 . The method for manufacturing the battery electrode of claim 19 wherein the electrode composite of the electrode stack is disposed between the continuous layer of lithium and the current collector.
22 . The method for manufacturing the battery electrode of claim 19 wherein the electrode composite comprises a range of 1% to 15% prelithiation.
23 . The method for manufacturing the battery electrode of claim 19 wherein the electrode composite comprises a range of 15% to 30% prelithiation.