Amprius Technologies has achieved a new battery energy density breakthrough of 500 Wh/kg with its lithium-ion cell, the Silicon Anode Platform. Mobile Power Solutions, an independent testing house offering battery regulatory compliance and performance testing, verified the Silicon Anode Platform's energy density performance.

The results indicate that this cell model provides >504 Wh/kg and >1321 Wh/l at 25°C. Check out the recent announcement from Amprius here and the results of the performance verification test here.