38results about How to "Increase working current density" patented technology

The invention discloses a semi-solid flow cell which is provided with a cell stack formed by parallel connection of one individual cell or multiple individual cells, wherein at least one of a positive pole electrolyte and a negative pole electrolyte comprises solid electrode particles to form an electrode suspension liquid; the surfaces of the solid electrode particles have catalytic activity; and active substances dissolved in the electrolytes can have an electrochemical oxidation or reduction reaction on the surfaces of the particles. Because the solid electrode particles can enlarge electrochemical oxidation area of the active substances in the electrolytes but not participate in the electrochemical oxidation, a current collector of the semi-solid flow cell does not need to have catalytic activity, so that the manufacturing cost is greatly reduced; and meanwhile, the solid electrode particles have good conductivity for collecting current generated in the electrochemical reaction, so as to form a conductive network. According to the invention, the work current density of the cell can be increased, the multiplying power performance of the cell can be improved, the size of a cell module is reduced, and the manufacturing cost of the cell can be lowered.

The invention discloses a bipolar membrane and its preparation method. In the invention, metal phthalocyanine derivatives are attached to at least one monopolar membrane in the bipolar membrane to form a bipolar membrane with an intermediate interface layer composed of metal phthalocyanine derivatives. polar membrane. The bipolar membrane prepared by this method has acid and alkali resistance, high water dissociation efficiency, high hydrogen ion and hydroxide ion permeability, high working current density, low membrane impedance, low working voltage, and the overall preparation process of the bipolar membrane is simple. Etc.

A gradient electrode for a liquid flow battery The gradient electrode is composed of at least two layers of graphite fibers or carbon fiber mats with different bulk densities stacked in order from low to high bulk densities, and is integrated by longitudinal needle punching perpendicular to the electrode surface. This kind of electrode can effectively reduce the resistance of the electrode body, reduce the flow resistance of the electrolyte and provide more reaction places, and finally reduce the ohmic polarization, electrochemical polarization and concentration polarization of the flow battery. The invention improves the energy efficiency and voltage efficiency of the liquid flow battery, thereby increasing its working current density, so that the weight, volume and cost of the battery with the same output power are greatly reduced.

A dual-functional negative electrode for an all-vanadium redox flow battery, the dual-functional negative electrode is based on a carbon material, and its surface is modified with a Bi-containing electrocatalyst, and the Bi-containing electrocatalyst is Bi simple substance, Bi2O3, Bi halide or Bi One or more than two kinds of metal salts; Bi halides are bismuth fluoride, bismuth chloride, bismuth bromide or bismuth iodide; Bi metal salts are bismuth sulfate, bismuth nitrate, bismuth phosphate, bismuth formate or bismuth acetate . This electrode is suitable for the negative electrode of the all-vanadium redox flow battery, which can greatly improve the electrocatalytic activity and electrochemical reversibility of the electrode material for the V2+ / V3+ redox reaction, reduce the charge transfer resistance; it also has a high hydrogen evolution overpotential, It can inhibit the occurrence of hydrogen evolution reaction and prolong the working life of the battery.

A kind of porous carbon fiber paper electrode material for vanadium redox flow battery, the thickness of porous carbon fiber paper electrode is 50-1000 μ m, it is made up of the carbon fiber that diameter is 5-20 μ m, the porosity of porous carbon fiber paper is 60-90%; Porous structure, the specific surface area of ​​carbon fiber is 5‑50m 2 / g, the pore size is 50-2000nm. The prepared porous carbon fiber paper has a significantly increased specific surface area and oxygen-containing functional groups, which can significantly improve the electrocatalytic activity of the carbon fiber material for the redox reaction of vanadium ions. This electrode material is suitable for all-vanadium redox flow batteries, which can reduce the distance between the electrodes of the battery, reduce the internal resistance of the battery, and reduce the charge transfer resistance, improve the voltage efficiency and energy efficiency of the all-vanadium redox flow battery, thereby increasing its working current density, making The weight, volume and cost of batteries with the same output power are greatly reduced.

The invention discloses a shield gate trench power device. A bottom dielectric layer and an inter-polysilicon isolation dielectric layer are formed in a deep trench of a gate structure, a region encircled by the inter-polysilicon isolation dielectric layer forms a source trench, a gate trench is formed in a region, on which self-alignment etching is performed, of the bottom dielectric layer arranged at a top of the deep trench, a gate dielectric layer is formed on a side surface of a top, corresponding to the deep trench, of the gate trench, a polysilicon gate is formed in the gate trench, source polysilicon is formed in the source trench, and the polysilicon gate and polysilicon of the source polysilicon are simultaneously formed. The invention also discloses a fabrication method of the shield gate trench power device. By the fabrication method of the shield gate trench power device, the threshold voltage of the device can be reduced, and meanwhile, the gate-source electric leakage of the device can be reduced; the process flow can be substantially simplified, so that the process cost is reduced; and the frequency characteristic can be improved, and the shield gate trench power device has relatively large working current density.

The invention discloses a preparation method of a bipolar membrane. The preparation method of the bipolar membrane is characterized by comprising the following steps of: (1), preparing a PAMPSLi membrane solution; (2), preparing a PAMPSLi-SA membrane; and (3), preparing a PAMPSLi-SA / mCS bipolar membrane. The preparation method of the bipolar membrane disclosed by the invention is simple and convenient to operate. The bipolar membrane which is obtained by the preparation method disclosed by the invention has the characteristics of being small in membrane impedance, low in working voltage, large in working current density, high in hydrolytic dissociation efficiency, high in ion permeability and the like.