Abstract: The disclosure belongs to the technical field of sodium ion battery materials, and discloses a preparation method of a hard carbon anode material and use thereof. The preparation method includes the following steps of: performing first sintering on starch, crushing, and introducing air and nitrogen for secondary sintering to obtain porous hard block granules; and performing third sintering on the porous hard block granules, and then continuously warming up to perform fourth sintering to obtain the hard carbon anode material. The hard carbon anode material prepared by the disclosure has a reversible capacity of no less than 330 mAh/g, excellent cycle stability and initial coulomb efficiency.

Abstract: A system for layup of a solar cell string on a substrate includes a robotic arm having a pickbar attached to a free end thereof. The pickbar has an elongated body with a plurality of vacuum grippers spaced along the body each for gripping an individual solar cell of the solar cell string. A vacuum source applies a vacuum through the vacuum grippers to grip the solar cells and a controller connected to the robotic arm positioned the solar cell string gripped by the pickbar on a substrate. A pair of sensor assemblies mounted on the pickbar generates signals representing positions of portions of the solar cell string and features of the substrate. The controller responds to the signals for positioning the gripped solar cell string relative to the substrate.