Silicon nanowires promise way better lithium-ion EV batteries
Adding silicon to the graphite-based anode can make a huge difference
Why silicon could be a game changer
According to research bythe PNNL Laboratory, silicon has a theoretical energy capacity 10 times higher than that of graphite, and can absorb lithium-ions much faster during charging — reducing the duration of the process.
For that reason, various companies and automakersare exploring the use of siliconin the anode, while Tesla and Porsche are already mixing small amounts of the material with graphite on batteries in theModel YandTaycan, respectively.
But adding silicon to the anode comes withcertain challenges.
The material’s tendency to expand approximately 400% of its original size during the charging cycle can cause the silicon particles to crack, and can damage the layer of the solid electrolyte interface, which hinders lithium ion conductivity and electrical flow.
This leads to energy loss and battery degradation.
As per Vincent Pluvinage, CEO of the startup, existing methods to solve this problem (likesilicon nanoparticles) have proven limited due to high manufacturing costs and lack of compatibility with the wider EV supply chain.
OneD Battery Sciences’s solution?
The company has developed a special platform, called Sinanode, which attaches the silicon nanowires onto the anode with the help of silane, nitrogen, and electricity.
This process promises three main benefits:
You can further discover how the process works in the video below:
The feature that really makes Sinanode stand out is its potential to scale-up the technology using existing supply chain processes.
The Sinanode is agnostic as to which graphite is used, or to the size of the graphite particle.
“This ensures that existing EV factories can benefit from silicon-enhanced graphite from their already qualified leading suppliers, and can use the same slurry preparation and anode electrode coating techniques that have already been perfected,” Pluvinage explained.
Currently the Sinanode technology is available to OEMS through a dedicated pilot production program, while fully commercial production is expected in 2025.
Overall, the arguments in favor of silicon over graphite are too strong to ignore, and if silicon nanowires prove to be successful on a commercial scale, perhaps the tech can unlock the possibility of replacing graphite inEV batteriesaltogether.
Story byIoanna Lykiardopoulou
Ioanna is a writer at TNW. She covers the full spectrum of the European tech ecosystem, with a particular interest in startups, sustainabili(show all)Ioanna is a writer at TNW. She covers the full spectrum of the European tech ecosystem, with a particular interest in startups, sustainability, green tech, AI, and EU policy. With a background in the humanities, she has a soft spot for social impact-enabling technologies.
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