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Materials in lithium-ion battery cathodes have continuously evolved since the 1990s, but anodes have stubbornly remained graphite. Now, finally, there’s some innovation on that side: silicon anodes, which engineers have struggled to master for a decade, are finally coming into wide commercialization. They enable up to five times the energy density of graphite anodes, charge many times faster, and are poised to revolutionize the battery market. In this episode, I talk with Rick Costantino, co-founder and CTO of Group14, which is selling a silicon-carbon composite material for anodes. They’re already selling to dozens of large battery manufacturers and expect silicon anodes to completely take over the market by 2030.

Chapters:

00:00 – Introduction and the graphite anode problem

01:54 – Why silicon, and why it kept failing

06:26 – From pharma to batteries: Rick's path

09:24 – How SCC55 works: silicon in a carbon scaffold

14:38 – The payoff: energy density and charge speed

18:59 – A drop-in material, and scaling in South Korea

21:11 – Where the batteries go: phones, EVs, drones

24:29 – Cost versus graphite

26:20 – Cycle life, calendar life, and safety

31:26 – Supply chain and the silane bottleneck

36:26 – Pairing with LFP, DOE support, and phones

40:30 – Bringing the cost down, and competitors

43:27 – The five-year outlook