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US 11,777,079 B2Granted
Silicon-carbon composite anode for lithium-ion batteries
AssigneeElkem ASA
InventorsHanne Flaten Andersen, Jorunn Voje
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Abstract
The present invention describes a silicon-carbon composite anode tor lithium-ion batteries comprising 40-80 weight % of silicon particles, 10-45 weight % of carbon, consisting of carbon black and graphite, and a combination of carboxymethyl cellulose (CMC) and styrene butadiene rubber (SB.R) as a binder. The invention also comprises a method of manufacturing the anode and a Li-ion battery comprising the Si—C composite anode according to the present invention.
Claims12
A silicon-carbon composite anode for lithium-ion batteries consisting of, based on the total mass of dry materials:
- 40-80 weight % of silicon particles with a D50 particle size between 1-10 μm,
- 10-45 weight % of carbon, consisting of carbon black and graphite, wherein the amount of carbon black is 5-17.5 weight % and the amount of graphite is 5-30 weight %, and
- a combination consisting of carboxymethyl cellulose (CMC) and styrene butadiene rubber (SBR) as a binder wherein the amount of CMC and SBR as the binder is 7.5-30 weight % and the mass ratio CMC/SBR is from 0.8:1 to 1:0.8,
- wherein lithium-ion batteries comprising said silicon-carbon composites allows >1200 cycles at cycling capacity of 600 mAh/gtot, or >1000 mAh/gSi.
1 more element
Dependencies are inferred from the claim text.