Abstract: A transformer includes a drum core and a coil set wound on the drum core. The coil set includes a conductive member and an insulating layer wrapping around the conductive member. A diameter of the conductive member is between 0.07 mm and 0.2 mm, and a ratio of an outer diameter of the insulating layer to the diameter of the conductive member is between 1.35 and 2.5.

Abstract: A method for the fabrication of an electroless-metal-plated sulfur nanocomposite, an electroless-metal-plated sulfur cathode which is made from the nanocomposite, and a battery that uses the cathode, where the method includes chemically plating a conductive metal nanoshell onto the surface of the insulating sulfur powder to improve the conductivity of the sulfur cathode material, where through enhancing the electrochemical reaction kinetics with metal catalysis capabilities, and performing physical and chemical adsorption of liquid polysulfides with metal activity, the electroless-metal-plated sulfur nanocomposite enables the battery to exhibit high electrochemical utilization and stable cyclability, such that the nanocomposite can achieve a high sulfur content and high metal content, and the cathode demonstrates a high sulfur loading with a low electrolyte-to-sulfur ratio, the lithium-sulfur battery with the cathode exhibiting a high discharge capacity along with high energy density, and maintaining stable a

Abstract: A wireless charging coil with a high Q factor includes a plurality of wire groups. Each of the wire groups includes a plurality of wires, a self-bonding film and a plurality of insulation layers. The wires are spun together in a helical manner to form a self-woven structure of the wire group. The self-bonding film surrounds the plurality of wires, and each of the insulation layers covers a surface of a wire. The plurality of wire groups together are wound into a plurality of turns on a same winding surface, and all of the plurality of wire groups are wound on the same winding surface. Each turn is wound by the plurality of wire groups.

Abstract: The present disclosure relates to a cathode for a Lithium-Sulfur (Li—S) battery including an electrically conductive, porous shell and a sulfur-based core enclosed within the shell. The electrically conductive, porous substantially encloses the sulfur-based core on a macro-scale and substantially blocks passage of polysulfides from the cathode. The present disclosure further includes Li—S batteries containing such cathodes and methods of assembling such cathodes and batteries.

Abstract: A wireless charging coil with a high Q factor includes a plurality of wire groups. Each of the wire groups includes a plurality of wires, a self-bonding film and a plurality of insulation layers. The wires are spun together in a helical manner to form a self-woven structure of the wire group. The self-bonding film surrounds the plurality of wires, and each of the insulation layers covers a surface of a wire. The plurality of wire groups together are wound into a plurality of turns on a same winding surface, and all of the plurality of wire groups are wound on the same winding surface. Each turn is wound by the plurality of wire groups.

Abstract: The present disclosure relates to a cathode for a Li—S battery including a first carbon layer, a second carbon layer, and a S-based cathode active material composition between the first and second carbon layers. At least one of the first and second carbon layers allows passage of lithium ions, while substantially preventing passage of polysulfides. Such a carbon layer may include a nanocarbon paper. The nanocarbon paper may include curved carbon nanotubes attached to a carbon nanofiber skeleton to form a binder-free SP2-hydridized carbon framework.

Abstract: The present disclosure relates to a lithium-sulfur rechargeable battery containing a lithium-containing anode, a sulfur-containing cathode, and a bifunctional separator having a microporous, conductive layer facing the cathode of the battery. The bifunctional separator can inhibit polysulfide diffusion and improve sulfur cathode material reutilization to improve cell cycling stability and discharge capacity.