[cellular]

Can the liquid be agitated to avoid dendrite growth?

[cyberax]

The schematic images are misleading. In reality, the separation between electrodes is usually on the scale of 1mm at most.

[cellular]

Ultrasonic agitation? Or vibration?

[cyberax]

A battery cell is a long thin ribbon that is rolled into a spiral shape. There's no way you can apply any mechanical agitation to all the layers. It's been tried, but nothing came out of it.