Method of manufacturing tab-less cylindrical cells
A method of manufacturing a lithium-sulfur battery in a cylindrical cell format is provided. In some aspects, the method includes providing an anode current collector and providing an anode on the anode current collector. The method may include depositing a protective layer on and along the length of the anode, providing a cathode current collector opposite to the anode, and providing a cathode on the cathode current collector. The method may include providing a separator between the anode and the cathode, disposing an adhesive carbon-containing layer along the bottom edge of the anode (e.g., to replace one or more conventional anode tabs), and dispersing an electrolyte throughout the lithium-sulfur battery. The method may include forming the lithium-sulfur battery in the cylindrical cell format by collectively winding into a jelly roll.
1 . A method of manufacturing a lithium-sulfur battery, the method comprising:
providing an anode current collector;
providing an anode on the anode current collector, the anode defined by a length extending along respective top and bottom edges of the anode;
depositing a protective layer on and along the length of the anode;
providing a cathode current collector opposite to the anode;
providing a cathode on the cathode current collector, the cathode positioned adjacent to the anode;
providing a separator between the anode and the cathode;
disposing an adhesive carbon-containing layer along the bottom edge of the anode;
dispersing an electrolyte throughout the lithium-sulfur battery; and
forming the lithium-sulfur battery in a cylindrical cell format by winding the lithium-sulfur battery into a jelly roll.
2 . The method of claim 1 , wherein winding the lithium-sulfur battery comprises winding the jelly roll such that the anode current collector extends lengthwise beyond the separator.
3 . The method of claim 1 , further comprising protecting one or more of the top edge or the bottom edge of the anode from lithium erosion by depositing the protective layer on and along the length of the anode.
4 . The method of claim 1 , further comprising:
protecting the bottom edge of the anode from contacting the electrolyte by disposing the adhesive carbon-containing layer along the bottom edge of the anode.
5 . The method of claim 1 , further comprising:
preventing delamination of lithium from the anode current collector by disposing the adhesive carbon-containing layer along the bottom edge of the anode.
6 . The method of claim 1 , wherein formation of the adhesive carbon-containing layer comprises nucleating a plurality of carbon particles at a certain concentration level, each of the plurality of carbon particles comprising a plurality of aggregates formed of few layer graphene (FLG) joined together to define a porous structure.
7 . The method of claim 1 , further comprising:
functionalizing the adhesive carbon-containing layer with two or more moieties, each moiety associated with a respective plurality of surface groups; and
interacting at least some of the respective pluralities of surface groups with one another.
8 . The method of claim 7 , further comprising cross-linking carbon atoms of graphenated materials within the adhesive carbon-containing layer based on interacting the at least some of the respective pluralities of surface groups with one another.
9 . The method of claim 8 , further comprising generating the adhesive carbon-containing layer as a heat transferring medium based on cross-linking carbon atoms of graphenated materials within the adhesive carbon-containing layer.
10 . The method of claim 1 , further comprising:
inserting the jelly roll into a can; and
sealing the can with a top lid and a bottom lid positioned opposite to the top lid.
11 . The method of claim 10 , further comprising:
welding the adhesive carbon-containing layer to the bottom lid of the can.
12 . The method of claim 10 , further comprising:
dipping the jelly roll into the adhesive carbon-containing layer.
13 . The method of claim 10 , further comprising configuring the adhesive carbon-obtaining layer to serve as an anode tab.
14 . The method of claim 13 , wherein the anode tab is configured to increase electrical discharge of the lithium-sulfur battery.
15 . The method of claim 10 , further comprising:
crimping the jelly roll into a final shape; and
compressing the final shape of the jelly roll into the bottom lid.
16 . The method of claim 1 , further comprising:
welding one or more cathode tabs to the cathode; or
gluing one or more cathode tabs to the cathode.
17 . The method of claim 1 , wherein the adhesive carbon-containing layer is formed of multiple carbon allotropes adjoined to one another.
18 . The method of claim 1 , wherein disposing the adhesive carbon-containing layer along the bottom edge of the anode further comprises:
processing the adhesive carbon-containing layer at a temperature above 18° C.;
activating cross-linking between carbon atoms of carbon allotropes within the adhesive carbon-containing layer; and
curing the adhesive carbon-containing layer into a final shape.
19 . The method of claim 1 , wherein disposing the adhesive carbon-containing layer along the bottom edge of the anode further comprises:
functionalizing one or more exposed surfaces of the adhesive carbon-containing layer with one or more amine groups;
functionalizing one or more exposed surfaces of the adhesive carbon-containing layer with one or more amine groups and thermal cross-linking agents; and
selecting one or more functionalized carbon allotropes within the adhesive carbon-containing layer for inclusion in the adhesive carbon-containing layer based on achieving a desired property for the adhesive carbon-containing layer.
20 . The method of claim 1 , further comprising:
increasing one or more of mechanical or electrical properties of the adhesive carbon-containing layer responsive to tuning a constituent material loading of the adhesive carbon-containing layer.