From the article: "Solid particles are suspended in a carrier liquid and pumped through the system. In this design, the battery's active components — the positive and negative electrodes, or cathodes and anodes — are composed of particles suspended in a liquid electrolyte."
The researchers claim this could enable recharging times for electric cars on par with refueling times for conventional ICE vehicles. They envision replacing a vehicle's spent battery liquid with freshly charged liquid using conventional pumping technology. The spent liquid can then be recharged and reused."