31results about How to "Low specific capacity" patented technology

The invention discloses a negative electrode of a foamed copper oxide / copper lithium ion battery and a preparation process thereof, comprising the following steps: carrying out pickling treatment on the surface of the foamed copper, washing and drying it with water, and compacting it; The surface is oxidized in an air atmosphere heat treatment furnace to obtain a layer of copper oxide (CuO, Cu2O or a mixture of the two) on the surface; then the slurry obtained by mixing carbon-based conductive agent, binder and solvent Coating on the surface of the foamed copper oxide / copper composite material, drying and pressing. The three-dimensional structure copper oxide / copper material coated with a conductive agent and a binder on the surface can be directly used as a negative electrode of a lithium-ion battery, without the need for mixing active materials with a binder and a conductive agent in the traditional preparation of a negative electrode of a lithium-ion battery The process of making a slurry and coating it on a current collector. The coated conductive agent and binder can increase the electrical contact of the copper oxide active material during charging and discharging, and increase the electronic conductivity and the utilization rate of the active material. The negative electrode of the lithium ion battery of the invention has high specific capacity, good cycle performance, and the preparation method of the electrode is simple and easy to control, and is very suitable for the industrial application of the lithium ion battery.

The invention discloses an asymmetric supercapacitor based on 3DSG / Mn3O4 / 3DMG and a preparation method thereof. The asymmetric supercapacitor based on 3DSG / Mn3O4 / 3DMG comprises an anode, a cathode, electrolyte solution and a diaphragm. The anode is made of a 3DSG / Mn3O4 composite material. The cathode is also made of the 3DSG / Mn3O4 composite material. The electrolyte solution is sodium sulfate solution. The preparation method of the invention comprises the steps of preparing the 3DSG / Mn3O4 composite material of the anode, preparing the 3DSG / Mn3O4 composite material of the cathode, preparing the sodium sulfate solution as the electrolyte solution, and assembling the capacitor. The asymmetric supercapacitor and the preparation method do not require binder or conductive agent. Furthermore the asymmetric supercapacitor and the preparation method have advantages of high metal oxide utilization rate, high conductivity and high storage capability. The asymmetric supercapacitor can be used for preparing an energy storage element.

The invention discloses a hybrid doped polypyrrole paper-based flexible electrode material. The preparation steps include dissolving a certain amount of lignosulfonate and sodium anthraquinone-2-sulfonate in a certain amount of distilled water at the same time, Obtain a hybrid doping solution; disperse a certain amount of cellulose fiber in the hybrid doping solution, and place it in an ice-water bath. After mechanical dispersion, add a certain amount of pyrrole monomer, and after mechanical stirring for a certain period of time, add it dropwise The ferric chloride oxidizing agent solution initiates polymerization; after polymerization for a certain period of time, the product is filtered, washed and dried to obtain a hybrid doped polypyrrole paper-based flexible electrode material. The invention has the advantages of simple process, readily available raw materials, and is suitable for large-scale industrial production, and the prepared hybrid doped polypyrrole paper-based flexible electrode material has the characteristics of low cost and high specific capacity.

The invention provides a method of preparing a TiO2 / SnO2 cathode material of a sodium ion battery by using a plasma electrolytic oxidation technique. An electrolyte is prepared from 1-10 ml / l phosphoric acid (85wt.%), 1-10 g / L sodium silicate, 5-30 g / L sodium stannate and 5-30 ml / L glycerol separately. The method comprises the following steps: by taking foamed titanium as an anode and stainless steel as a cathode, immersing the anode and the cathode into a special electrolyte solution containing phosphoric acid, sodium silicate, sodium stannate, glycerol and deionized water; applying a bipolarpulse voltage between the two electrodes at constant temperature and constant pressure, wherein plasma discharge happens on the surface of the foamed titanium; turning off a power supply after discharge for a period of time to prepare the TiO2 / SnO2 composite membrane on the surface of the foamed titanium. The composite membrane can be used as a cathode material of the sodium ion battery. The TiO2 / SnO2 cathode material makes full use of a high capacity characteristic and high cyclic stability of TiO2. The method is simple in preparation process, low in production cost and suitable for industrial production.