31results about How to "Higher area than capacitance" patented technology

The invention discloses a method for increasing binding force between an anodic titanium oxide nanometer tube array film and a titanium substrate. According to the method, the titanium oxide nanometertube array film is prepared by adopting a general constant-current or constant-voltage anodic oxidation method; subsequently small-current or small-voltage short-time constant-current or constant-voltage anodic oxidation treatment is carried out in the same electrolyte; finally annealing treatment is carried out; and thus the binding force between the titanium oxide nanometer tube array film andthe titanium substrate can be remarkably increased and can preferably meet the requirements of practical application. The method disclosed by the invention is simple and convenient to operate; the electrolyte needs not to be replaced; internal stress caused by over-large volume expansion and relatively poor plasticity of the metallic titanium in a growth process of an oxidation film can be effectively released; the binding force between the oxidation film and the titanium substrate is remarkably increased; and the method is also applicable to flexible thin titanium sheets.

The invention relates to a preparation method of a negative electrode material of a high-specific-capacitance flexible super-capacitor. The preparation method comprises the following steps: (1) preparing molybdenum-doped tungsten oxide nanoparticles through a hydrothermal method; dispersing the molybdenum-doped tungsten oxide nanoparticles and carbon nanotubes CNTs into water; carrying out ultrasonic treatment to obtain a uniform dispersed solution; (2) performing suction filtration on the dispersed solution, and washing and drying to obtain the negative electrode material of the high-specific-capacitance flexible super-capacitor. The preparation method provided by the invention is simple, short in time and low in cost; the prepared electrode material has relatively high flexibility and electrochemical activities; under relatively high current density, the area specific capacitance can reach 1.1F.cm<-2>; the electrode material has great application prospect in the field of the super-capacitors.

The invention provides a lignin-based supercapacitor material with high area specific capacitance, a preparation method and an application thereof. The supercapacitor material in the present invention is a composite material in which lignin-based porous graphene is combined on a substrate; and two preparation methods are provided. Method 1: The lignin is removed from the ash and then dissolved, and the obtained impregnating solution is impregnated with the substrate, dried and then subjected to laser direct writing, and the obtained lignin-based porous graphene-substrate composite material removes excess lignin. Method 2: Apply the ball-milled lignin on the substrate, melt and combine it on the substrate; then perform laser direct writing, and remove excess lignin from the obtained lignin-based porous graphene-substrate composite. Both methods can obtain the lignin-based supercapacitor material with high area specific capacitance described in the present invention. The supercapacitor material of the present invention uses flexible carbon cloth as a base material, has excellent flexibility, can be bent at any angle, and has ultrahigh area specific capacitance.

The invention discloses an electrode with a flexible self-supporting structure and a preparation method thereof, belonging to the technical field of electrochemical energy storage. A metal substrate is soaked in a graphene oxide solution and evaporated to form a layer of graphene oxide on the substrate. The thin film is then reduced with ascorbic acid to obtain the lower layer of reduced graphene oxide thin film; the mixed aqueous solution of transition metal salt, copper salt, and surfactant is spin-coated on the titanium sheet substrate, and synthesized in a flame to prepare The middle nano-carbon film is obtained; the upper reduced graphene oxide film is prepared by the same preparation method as the lower reduced graphene oxide film; the substrate is dried, and the prepared film is peeled off from the substrate to obtain a flexible, metal-free Substrate self-supporting structural electrodes. The electrode has a unique structure, simple preparation method and low cost, and has high area specific capacitance and excellent cycle stability when used as an electrode of a supercapacitor, and has broad application prospects.