Abstract: An organic-inorganic composite electrolyte comprises a plurality of metal cations, a plurality of organic polymer groups, a plurality of negatively charged ion groups and a plurality of salt anions. At least part of the plurality of metal cations is combined with the plurality of organic polymer groups, the plurality of negatively charged ion groups and the plurality of salt anions via covalent bonds.

Abstract: The present application provides a silicon-carbon composite material. The silicon-carbon composite material comprises a plurality particles. Each of the plurality of particles comprises a silicon nanoparticle; a first carbon layer wrapping a surface of the silicon nanoparticle; a second carbon layer wrapping the first carbon layer; and an elastic layer wrapping the second carbon layer. The silicon nanoparticle comprises a silicon matrix and at least one doping element located in the silicon matrix. Methods for preparing the silicon-carbon composite material and for preparing a silicon-carbon composite slurry are further provided.

Abstract: A wireless transmission module for transmitting energy or signals includes a first magnetically conductive element, a first coil assembly and a first adhesive element. The first coil assembly and the first magnetically conductive element are arranged along a main axis. The first adhesive element is configured to be adhered to the first coil assembly and the first magnetic conductive element. The first adhesive element is disposed between the first coil assembly and the first magnetically conductive element.

Abstract: A ratchet wheel screwdriver structure includes a rod, a handle, and a control unit. The rod has a turning part at one end and a ratchet wheel at the other end. The ratchet wheel can be locked in the hinge hole on the handle, and the handles has a receiving hole at each side of the ratchet wheel. The receiving hole has a control unit on the spring part, which provides a recessed space for the ratchet to pass through. At the bottom of the recessed space, there is a 2-tiered block, which can prop the ratchet wheel at the bottom side to limit the ratchet wheel to turn towards it from the recessed space. An operator can press the control part of at each side of the ratchet wheel to drive the ratchet wheel in two directions.