CARBON ADDITIVES FOR DIRECT COATING OF SILICON-DOMINANT ANODES
Systems and methods are provided for carbon additives for direct coating of silicon-dominant anodes. An example composition for use in directly coated anodes may include a silicon-dominated anode active material, a carbon-based binder, and a carbon-based additive, with the composition being configured for low-temperature pyrolysis. The low-temperature pyrolysis may be conducted at <850° C. An anode may be formed using a direct coating process of the composition on a current collector. The anode active material may yield silicon constituting between 90% and 95% of weight of the formed anode after pyrolysis. The carbon-based additive may yield carbon constituting between 2% and 6% of weight of the formed anode after pyrolysis. The carbon-based additive may include carbon particles with surface area >65 m 2 /g.
1 . A composition for use in directly coated anodes, the composition comprising:
a silicon-dominated anode active material;
a carbon-based binder; and
a carbon-based additive;
wherein:
the anode active material yields silicon constituting at least 85% but less than 95% of a weight of a formed anode after pyrolysis;
the carbon-based binder yields carbon constituting between 4% and 10% of a weight of a formed anode after pyrolysis; and
the carbon-based additive yields carbon constituting between 2% and 6% of a weight of a formed anode after pyrolysis.
2 . The composition according to claim 1 , wherein the composition is configured for low-temperature pyrolysis, the low-temperature pyrolysis is conducted at <850° C.
3 . (canceled)
4 . (canceled)
5 . (canceled)
6 . (canceled)
7 . The composition according to claim 1 , wherein the carbon-based additive comprises at least one of ECP, ECP600, Super-P, and SLP.
8 . The composition according to claim 1 , wherein the carbon-based additive comprises carbon particles with surface area >65 m 2 /g.
9 . The composition according to claim 1 , wherein the anode active material comprises at least one of polyamide-imide (PAI) and polyacrylic acid (PAA).
10 . A method comprising:
mixing a composition for use in directly coated anodes, the composition comprising: a silicon-dominated anode active material; a carbon-based binder; and a carbon-based additive,
wherein:
the anode active material yields silicon constituting at least 85% but less than 95% of a weight of a formed anode after pyrolysis;
the carbon-based binder yields carbon constituting between 4% and 10% of weight of the formed anode after pyrolysis; and
the carbon-based additive yields carbon constituting between 2% and 6% of weight of the formed anode after pyrolysis.
11 . The method according to claim 10 , wherein the composition is configured for low-temperature pyrolysis, the low-temperature pyrolysis is conducted at <850° C.
12 . The method according to claim 10 , comprising forming an anode using a direct coating process of the composition on a current collector.
13 . (canceled)
14 . (canceled)
15 . (canceled)
16 . (canceled)
17 . The method according to claim 10 , wherein the carbon-based additive comprises at least one of ECP, ECP600, Super-P, and SLP.
18 . The method according to claim 10 , wherein the carbon-based additive comprises carbon particles with surface area >65 m 2 /g.
19 . The method according to claim 10 , wherein the anode active material comprises at least one of polyamide-imide (PAI) and polyacrylic acid (PAA).