StoreDot in Israel has developed a protype of its fast charging silicon battery technology in the 4680 cylindrical form factor proposed by Tesla. It is also looking at solid state technology.
The 46 x 80 mm 4680 form factor requires chemistry adaptation to offset greater internal pressures, gas release and avoidance of potential leakage for the lithium ion electrolyte. The cells can fully charge in 10 minutes.
The 4680 cell samples are now ramping up the production lines at EVE Energy, StoreDot’s manufacturing partner in China for mass production in 2024 alongside pouch cells. The move to a silicon anode marks a shift away from the original geranium-based fast charging pouch cells and opens up the possibility of electric vehicles that can fully charge in under 15 minutes.
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The silicon technology was developed with the University of Warwick and strategic investor BP, and the prototype is covered with five patents in the area of cell design and uses StoreDot’s continuous tab technology. This continuous tab cell design increases production throughput and addresses safety and performance issues typically associated with the hard case structure of cylindrical cells. Testing at StoreDot facility has shown promising low levels of internal resistance.
Silicon anodes are an increasingly popular technology for increasing the energy density of lithium ion cells (see below).
“Achieving the goal of extreme fast charging a cylindrical cell in only 10 minutes has been on StoreDot’s technology roadmap from day one,” said Dr Doron Myersdorf, CDEO of StoreDot. “After three years of vigorous development and testing, leveraging multiple vectors of our world class researches, I am hugely proud at the effective collaboration across our globe that enabled this important achievement. It’s highly significant that we can offer Electric Vehicle manufacturers the choice of cell formats, utilizing our XFC technology that will overcome the current barriers to EV ownership: range and charging anxiety.
“We are pleased that our silicon-dominant XFC battery cell chemistry is adaptable and can be applied to various packaging formats, to suit changing market needs,” he said. “Both our cylinder and pouch cell form factors are designed to be safe, reliable and stable, and are expected to be produced at scale by 2024. We are in advanced discussions with a number of global automotive manufacturers and we plan to supply them with various XFC cells, enabling a rapid transition to a zero-emissions electrified future.”
StoreDot is in discussions with leading automotive manufacturers on the 4680 cells and is looking at solid state technologies that would enter mass production in 2028. As well as BP, the company’s StoreDot’s strategic investors include car maker Daimler, Samsung Ventures and TDK.
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