Question for small batch startup

Hello everyone, we are a newly established battery cathode company. Our company is looking for a small wet grinding system that we can expand upon later down the road. Is there anyone that knows of an Industrial Agitator Tank manufacturer that can provide custom-made units with a volume of 500L? Additionally, would a horizontal bead mill be overkill for a D50 coating particle size of 5 microns, or would an entry-level wet bead mill suffice? Any help would be greatly appreciated.