They claim to be able to control the dendrite growth.
From the SBV writeup:
"PROJECT INNOVATION + ADVANTAGES In addition to utilizing existing manufacturing technology, the battery uses existing materials for the anode, cathode, the separator and the electrolytes. This reduces the risk of new materials adoption and testing. The technology also includes a unique approach using microchip geometry to control dendrite growth."
I guess eventually we will find out what the holdup was.
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