Battery technology company Sionic Energy, together with Group14 Technologies, has announced the results of testing that demonstrates a new level of high-temperature stability for 100% silicon-carbon anodes in lithium-ion cells.

By combining Group14’s SCC55 silicon-carbon anode material with Sionic’s proprietary Rapid Integration Silicon Platform containing 100% silicon-carbon (Si-C) anode and enhanced electrolyte, the companies “have set a new benchmark for silicon battery technology, expanding its path to a broader set of applications in transportation, consumer electronics and aviation markets.”

The companies tested Sionic’s Rapid Integration Silicon Platform with SCC55 in 4 Ah, 10 Ah and 20 Ah pouch cells under electrolyte-lean conditions with NMC 83 cathodes. The cells delivered stable 1C/-1C cycling at 45° C, and retained >70% of room-temperature cycle life. Storage testing at 45° C and 60° C displayed substantial suppressed gas generation and lower impedance growth, supporting the potential of extended calendar life over baseline chemistries.

Sionic says its graphite-free Rapid Integration Silicon Platform delivers specific energy of up to 400 Wh/kg, cycle life of over 1,200 cycles, and strong performance, in cell formats already used by partners.

“Our Rapid Integration Silicon Platform delivers up to a 50% jump in performance while dropping right into industry-standard equipment with no complexity: no pre-lithiation, no external compression, no extensive cell design efforts,” said Ed Williams, President and CEO of Sionic Energy.

“This benchmark is a powerful validation that silicon batteries are market-ready,” said Rick Luebbe, CEO and co-founder of Group14 Technologies. “Customers want true drop-in silicon-carbon anodes that deliver up to 50% higher energy density, dramatically faster charging, and robust lifetime across extreme temperatures. These latest results with 100% SCC55 show that we can meet those expectations at scale, today.”

A technical white paper with full test data is available to qualified OEMs, cell manufacturers and investors.

Source: Sionic Energy