Amprius

Its SiCore cells reach up to 450 Wh/kg, and the company says its cells can charge from 0 to 80% in as little as six minutes and last 1,300 full cycles. SiCore uses a four-layer anode structure with an elastic silicon nanostructure inside to handle expansion.

The company is based in Fremont, California, where it runs a MWh-scale manufacturing and R&D facility, and makes larger volumes through contract manufacturing partners in Asia. It has announced a repeat $35 million purchase order from a drone manufacturer.