Silicon battery tops 1000Wh/l
A lithium ion battery cell with a silicon anode developed by Sionic Energy is set to top an energy density of 1000Wh/l.
Sionic, a spin out of Cornell University in the US in 2011, is using the SCC55 engineered silicon material from Group14 for the anode of cells with a capacity of 4Ah to 10Ah and of at least 330 Wh/kg and energy densities of at least 842 Wh/L, a 42% energy density increase on today’s cells.
The cell lifetime is over 1200 cycles for leading edge smartphones and other consumer applications. It can be used in existing battery lines and the Sionic Silicon Battery Platform accommodates cylindrical, pouch, and prismatic cell formats.
Verification is underway with Sionic’s platform in a 20Ah cell format designed to deliver energy density of 370 Wh/kg and 1000 W/L, which is expected to ship in 2025. This is key for boosting the range of electric vehicles and electric aircraft, including eVTOL air taxis.
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Using silicon provides a higher energy density in lithium ion battery cells, but the material can swell significantly, causing a cell to rupture and resulting in short circuits and thermal runaway. The SCC55 material is a silicon-carbon composite developed by Group14 uses silane produced in Germany, and the company is building the world’s largest factory for advanced silicon battery materials in Moses Lake, Washington state.
“Having worked extensively with several leading silicon materials in our product designs over the past several years, we’ve chosen Group14 as the best-in-class performer to launch our Silicon Battery Platform,” said President and CEO of Sionic Energy, Ed Williams.
“Group14’s customers continue to raise the bar for battery performance, and we are pleased to support Sionic’s silicon batteries with an anode powered entirely by Group14’s SCC55,” added Dr. Rick Costantino, co-founder and CTO of Group14 Technologies, the world’s largest global manufacturer and supplier of advanced silicon battery materials.
www.group14.technology; www.sionicsenergy.com
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