Abstract: The present disclosure is directed to systems and methods of producing lithium carbonate. The lithium carbonate can be produced by contacting a lithium precursor with a carbon dioxide gas. The lithium carbonate produced from this method can include micron-sized lithium carbonate particles with nano-sized lithium carbonate particles coated on a surface of the micron-sized lithium carbonate particles.

Abstract: A rotor assembly and an electronic water pump are provided, and the rotor assembly includes an impeller cover, an impeller base and a rotor. One end of the impeller base is connected to the impeller cover, an outer wall of the other end of the impeller base is provided with a ring-shaped mounting recess, and the rotor is mounted in the mounting recess. The rotor comprises a rotor iron core, a sleeve and at least two end plates, the rotor iron core is sleeved on an outside of the impeller base and located in the mounting recess, the sleeve is sleeved on an outside of the rotor iron core to seal the rotor iron core in the mounting recess, the at least two end plates are located on both ends of the rotor iron core, respectively. And the at least two end plates are connected to the sleeve.