Method for tuning lithium wettability of an anode current collector using plasma surface modification
AssigneeGM Global Technology Operations LLC
InventorsMing Wang, Mary Gilliam, Shaomao Xu, Diptak Bhattacharya, Xiaowei Yu
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Abstract
A method for manufacturing an anode electrode includes supplying an anode current collector; coating a first portion of the anode current collector with a precursor coating; not coating a second portion of the anode current collector with the precursor coating; treating the anode current collector with plasma to at least one of decrease lithium wettability of the first portion and to increase lithium wettability of the second portion; and coating the anode current collector with lithium metal to form an anode active material layer.
Claims20
A method for manufacturing an anode electrode, comprising:
- supplying an anode current collector;
- coating a first portion of the anode current collector with a lithiophilic coating;
- not coating a second portion of the anode current collector with the lithiophilic coating;
- treating the anode current collector with plasma to at least one of decrease lithium wettability of the first portion by facilitating a chemical reaction of the lithiophilic coating and to increase lithium wettability of the second portion;
- and
- coating the anode current collector with lithium metal to form an anode active material layer,
- wherein coating the anode current collector with the lithium metal comprises supplying lithium metal powder at spaced intervals on the anode current collector using an engraved roller including a plurality of cavities and heating the lithium metal powder to melt the lithium metal powder.
A method for manufacturing an anode electrode, comprising:
- supplying an anode current collector;
- coating a first portion of the anode current collector with a lithiophilic coating wherein the first portion corresponds to an edge of the anode current collector;
- not coating a second portion of the anode current collector with the lithiophilic coating, wherein the second portion corresponds to a location where an anode active material layer of the anode current collector is arranged;
- treating the anode current collector with plasma to at least one of decrease lithium wettability of the first portion by facilitating a chemical reaction of the lithiophilic coating and to increase lithium wettability of the second portion,
- wherein a plasma gas for the plasma includes one or more elements selected from a group consisting of molecular nitrogen (N2), ammonia (NH3), an amine compound, a silazane, and/or combinations thereof;
- and
- coating the anode current collector with lithium metal to form the anode active material layer by passing the anode current collector through a bath including molten lithium metal,
- wherein coating the anode current collector with the lithium metal comprises supplying lithium metal powder at spaced intervals on the anode current collector using an engraved roller including a plurality of cavities and heating the lithium metal powder to melt the lithium metal powder.
A method for manufacturing an anode electrode, comprising:
- supplying an anode current collector;
- coating a first portion of the anode current collector with a lithiophilic coating;
- not coating a second portion of the anode current collector with the lithiophilic coating;
- treating the anode current collector with plasma to at least one of decrease lithium wettability of the first portion by facilitating a chemical reaction of the lithiophilic coating and to increase lithium wettability of the second portion;
- and
- coating the anode current collector with lithium metal to form an anode active material layer,
- wherein the method further includes cooling the first portion of the anode current collector to a temperature in a range from 10° C. to 25° C. prior to treating the anode current collector with plasma.
Dependencies are inferred from the claim text.