Abstract: An integrated electrode frame and preparation method and use thereof is provided. The integrated electrode frame includes a positive electrode frame, a negative electrode frame, and a membrane. Each of the positive electrode frame and the negative electrode frame is a flat plate with a central through-hole. The membrane is placed between the positive electrode frame and the negative electrode frame, and the membrane is located at the through-hole and hermetically connected to a peripheral edge of the through-hole. A peripheral edge of the positive electrode frame is hermetically connected to a peripheral edge of the negative electrode frame. A material composition of a connecting part of the positive electrode frame and the negative electrode frame contains at least one material which is the same as that of the positive electrode frame or the negative electrode frame. The structures and materials of the electrode frames and the membrane are optimized.

Abstract: Disclosed is use of a porous membrane and a composite membrane thereof in a redox flow batteries, and in particular the use thereof in a vanadium redox flow battery. The membrane can effectively realize the separation of ions with different valence states, and an ion transfer without any ion exchange group. The pore size and structure of the porous membrane can be controlled by filling an inorganic substance or grafting an ion exchange group in the pore, in order to improve the barrier properties of the porous membrane for vanadium ions and to increase proton conductivity.

Abstract: Disclosed is use of a porous membrane and a composite membrane thereof in a redox flow batteries, and in particular the use thereof in a vanadium redox flow battery. The membrane can effectively realize the separation of ions with different valence states, and an ion transfer without any ion exchange group. The pore size and structure of the porous membrane can be controlled by filling an inorganic substance or grafting an ion exchange group in the pore, in order to improve the barrier properties of the porous membrane for vanadium ions and to increase proton conductivity.