As Amprius is a battery manufacturer, I am not sure where they get their nano silcon wires from....but this could be one of the parties that HPQ has the NDA with (potential customer)...even if not, it shows that technology has progressed to the point of moving towards actual application as opposed to just theoretical.  Supply chains will need to line up and providers will be in need when production ramps (drivers seat).

A new silicon battery design just beat Tesla's energy density (interestingengineering.com)