METHOD OF MAKING ELECTRODES FOR ALL SOLID STATE BATTERIES
Methods of making a lithiated composite fiber include mixing lithiated perfluorosulfonic acid with a suitable polymer to form a polymer solution and electrospinning the polymer solution to generate a lithiated fiber. The lithiated fiber can be used to make positive electrodes. Methods of making a positive electrode with lithiated fiber include mixing an active material, lithiated fiber, an electrically conductive additive, and a solvent to form a solution and processing the solution. The processed solution can be coated on an aluminum sheet.
1 . A method of making a fiber-containing electrode for a solid-state lithium battery, comprising:
forming an electrode composition, the electrode composition including a lithiated ionomer, a carrier polymer, and a polar solvent;
electrospinning the electrode composition to form a lithiated fiber; and
forming a layer including the lithiated fiber, thereby providing the fiber-containing electrode for the solid-state lithium battery.
2 . The method of claim 1 , wherein the lithiated ionomer includes a lithiated perfluorosulfonic acid.
3 . The method of claim 1 , wherein the electrode composition further includes a cathode active material.
4 . The method of claim 3 , wherein the cathode active material includes one of a metal oxide and a metal phosphate.
5 . The method of claim 1 , wherein the electrode composition further includes an electrically conductive additive.
6 . The method of claim 5 , wherein the electrically conductive additive includes a member selected from a group consisting of carbon, carbon black, carbon microfibers, carbon nanofibers, carbon nanotubes, graphite nanofibers, and graphene.
7 . The method of claim 1 , wherein the electrode composition further includes a cathode active material and an electrically conductive additive.
8 . The method of claim 1 , wherein electrospinning the electrode composition to form the lithiated fiber includes forming a lithiated fiber having a diameter from 10 nanometers to 100 micrometers.
9 . The method of claim 1 , wherein electrospinning the electrode composition to form the lithiated fiber includes forming a lithiated fiber having a diameter from 0.1 micrometers to 10 micrometers.
10 . The method of claim 1 , further comprising processing the lithiated fiber to form lithiated fibers having a predetermined length prior to the layering composition being used in forming the layer.
11 . The method of claim 1 , wherein electrospinning the electrode composition to form the lithiated fiber includes electrospinning the electrode composition onto a current collector.
12 . The method of claim 1 , wherein forming the layer including the lithiated fiber includes forming a layering composition including the lithiated fiber, a cathode active material, and an electrically conductive additive, the layering composition being used in forming the layer.
13 . The method of claim 12 , further comprising processing the layering composition to form lithiated fibers having a predetermined length prior to the layering composition being used in forming the layer.
14 . The method of claim 13 , wherein processing the layering composition to form lithiated fibers having a predetermined length includes subjecting the layering composition to a shearing force.
15 . The method of claim 1 , wherein the layer including the lithiated fiber includes 3-35 wt% lithiated fiber and 60-95 wt% cathode active material.
16 . The method of claim 1 , wherein the layer including the lithiated fiber includes 5-25 wt% lithiated fiber.
17 . A method of making an electrode-electrolyte composite for a solid-state lithium battery, comprising:
making a fiber-containing electrode according to the method of claim 1 ; and
disposing the fiber-containing electrode in direct contact with a solid-state electrolyte.
18 . The method of claim 17 , wherein disposing the fiber-containing electrode in direct contact with the solid-state electrolyte includes one of:
transferring the fiber-containing electrode from a substrate to the solid-state electrolyte; and
forming the solid-state electrolyte directly on the fiber-containing electrode.
19 . A fiber-containing electrode for a solid-state lithium battery, the fiber-containing electrode made according to the method of claim 1 .
20 . A solid-state lithium-ion battery comprising a fiber-containing electrode made according to the method of claim 1 .