14results about How to "Increased charge storage capacity" patented technology

The invention relates to the technical field of sodium ion battery research and development, and particularly discloses a strong-oxidizing acidified asphalt-based hard carbon negative electrode material and a preparation method and application thereof, concentrated nitric acid or concentrated sulfuric acid is introduced into asphalt as a cross-linking agent, so that the cross-linking reaction among molecules can be promoted under a low-temperature condition, and the structural stability of the material is greatly improved. Compared with a traditional method, the method has the advantages that the technological process is simplified, only one-step pretreatment is needed before carbonization, and energy consumption and pollution caused by high temperature can be avoided. According to the liquid phase cross-linking strategy, through reconstruction of chemical bonds, the low-softening-point asphalt can form a more compact carbon precursor network structure at low temperature, and formation of a high-performance hard carbon material in the subsequent carbonization process is facilitated.

The invention discloses a lithium ion battery negative electrode with low expansion and low impedance. The lithium ion battery negative electrode comprises a composite current collector and a negative electrode active material coating coated on at least one surface of the composite current collector, the negative electrode active material coating comprises a negative electrode active material, graphene and lithium polyacrylate; the mass ratio of the negative electrode active material to the graphene to the lithium polyacrylate is (90-99): (0.5-5): (0.5-5), the negative electrode active material comprises a silicon carbon material and a coating material layer arranged on the outer surface of the silicon carbon material, and the coating material layer comprises a polypyrrole layer and single-walled carbon nanotubes uniformly distributed in the polypyrrole layer. Compared with the prior art, the lithium ion battery negative electrode provided by the invention has the advantages of low expansion and low impedance, and can effectively inhibit the expansion of silicon particles, reduce the internal resistance of the battery and maintain the structural stability of the electrode.

The invention discloses a magnesium-doped sodium-rich sodium polyvanadate material and a preparation method and application thereof, the microstructure of the magnesium-doped sodium-rich sodium polyvanadate material is of a micron-scale porous structure, and the chemical formula of the magnesium-doped sodium-rich sodium polyvanadate material is MgxNa < 2 + y > V6O16. 4.0 H2O, where 0 lt; xlt; 0.1, 0 lt; yt; Yt; 6. The preparation method comprises the following steps: dissolving sodium metavanadate in deionized water, adding a magnesium source and an acid solution, and fully stirring until the mixture is uniform; and continuously stirring the uniform solution in a water bath kettle until the uniform solution fully reacts, standing, naturally cooling, filtering, washing and drying to obtain the magnesium-doped sodium-rich sodium polyvanadate material. The simple water bath method is adopted, magnesium ions are further doped in the sodium-rich sodium polyvanadate material, a unique interlayer dication (Mg < 2 + > / Na < + >) defect structure is formed, the electronic conductivity of the material is remarkably improved, and then the charge storage capacity of the sodium polyvanadate positive electrode material is enhanced. When the composite material is applied to a battery, the battery shows excellent electrochemical performance and has a good application prospect.

The invention relates to a porous fixed bed electrode of a non-metal electro-adsorption device and a preparation method of the porous fixed bed electrode. The porous fixed bed electrode comprises the following components in percentage by mass: 70-95% of a non-metallic material and 5-30% of a polymer. The preparation method comprises the following steps: uniformly mixing the non-metallic material and the polymer which are weighed according to a design ratio, and carrying out high-temperature pyrolysis under the protection of oxygen deficiency or inert gas. The electrode has a complex microporous structure, high conductivity and high stability, is suitable for an electro-adsorption device, and can be used as an electrode and an electrolyte or concentrated / fresh water channel. The porous fixed bed electrode solves the problems that a traditional electrode is low in efficiency, prone to blockage and the like, the electric conduction and dynamic performance of the fixed bed electrode is improved, and the working efficiency and the electrode utilization rate of an electro-adsorption device can be effectively improved.

The present disclosure relates to a complex-phase ceramic and a preparation method and application thereof, the electrical performance of the ceramic single crystal boundary is improved by introducing yttrium element and complex phase, and then the electrical performance of the entire ceramic system is improved; the prepared yttrium element doped calcium copper titanate and strontium copper titanate complex phase ceramic system has excellent breakdown field strength and giant dielectric performance, and can improve the performance of capacitor energy storage elements, memory functional devices, multilayer ceramic capacitors and other functional devices.

The invention provides a vanadium-doped Co9S8 nanosheet array as well as a preparation method and application thereof. The invention provides a vanadium-doped Co9S8 nanosheet array preparation method, which comprises: dissolving a cobalt salt and 2-methylimidazole in deionized water, adding foamed nickel, and carrying out a reaction at a room temperature to obtain a Co-ZIF nanosheet array precursor; then adding the VCo-ZIF nanosheets into a sodium metavanadate solution, and carrying out hydrothermal reaction to obtain a VCo-ZIF nanosheet array; and finally, adding the VCo-ZIF into a sulfur source solution, and vulcanizing to obtain the vanadium-doped Co9S8 nanosheet array. The formed porous nanosheet structure can provide a larger active specific surface area, the synergistic effect between Co and V ions can improve the charge storage capacity of the material, and sulfur vacancies on the surface of the electrode material can increase the conductivity and the number of active sites. Practice shows that when the material is used as a supercapacitor electrode material, the specific capacity and the rate capability are remarkably improved.

The application discloses a kind of high specific capacity electrode foil and its production process, belong to aluminum electrolytic capacitor technical field, by carbon-coated aluminum powder obtained by glucose pyrolysis coating, using sol-gel-hydrothermal method to synthesize dielectric nanosphere powder, again through sol-precipitation method to generate dielectric nanosphere as the core of composite dielectric core-shell nanosphere powder, again using manganese metal organic framework deposition on the surface of composite dielectric core-shell nanosphere powder and calcination, get sheet manganese oxide coated high dielectric nanosphere, through sheet manganese oxide, core-shell nanosphere and carbon layer on the surface of carbon-coated aluminum powder three synergistic slip, to give electrode foil flexibility, can meet the needs of winding in processing and capacitor assembly;When calcining, manganese ions will enter the lattice of composite dielectric core-shell nanosphere to replace titanium ions, produce negative center, so that dielectric constant increases, improve the charge storage capacity of capacitor, and produce oxygen vacancy, reduce dielectric loss, improve the overall performance of capacitor.

The present invention discloses a floating gate memory device based on hollow structure nanoparticles and a preparation method thereof, which relates to the field of charge storage technology. The floating gate memory device comprises: a substrate; a tunnel oxide layer, which is arranged on the substrate; a storage medium layer, which is arranged on the tunnel oxide layer and contains CoO nanoparticles with a hollow structure; a control oxide layer, which is arranged on the storage medium layer; the preparation method comprises: forming a tunnel oxide layer on the substrate; continuing to form a storage medium layer, comprising: alternately depositing oxide and Co on the tunnel oxide layer by a pulsed laser deposition device, annealing in a protective gas atmosphere, and embedding Co nanoparticles in amorphous oxide; annealing in an oxygen atmosphere to form CoO nanoparticles with a hollow structure; and continuing to form a control oxide layer. The beneficial effect of the present invention is that hollow structured cobalt oxide nanoparticles are formed, which have more surface defects and interface states, can capture more injected charges, and enhance the charge storage capacity of the device.

This invention discloses the preparation and application of a porous bismuth ferrite material. The preparation method includes the following steps: dissolving bismuth and iron salts in an acid solution to obtain a metal solution; adding a complexing agent and a pore-forming agent to the metal solution and mixing to obtain a precursor solution; heating the precursor solution to obtain a wet gel; drying the wet gel to obtain a dry gel; and calcining the dry gel under an inert atmosphere containing 6-10% oxygen to obtain the porous bismuth ferrite material. The porous bismuth ferrite electrode material of this invention not only solves the structural defects of traditional porous bismuth ferrite materials, such as small pore volume and insufficient utilization of active sites, but also fully utilizes its membrane capacitance characteristics and bimetallic synergistic effect, showing excellent application prospects in the field of capacitive deionization and chlorine removal.

A composite material for energy storage electrode, characterized in that: the composite material is composed of α-crystalline Fe2O3 and graphene, wherein Fe2O3 is in a hollow tubular structure, formed by the accumulation of Fe2O3 nanoparticles, and graphene is coated on the surface of Fe2O3, and the mass proportion of graphene is between 4.8% and 31.3%. The Fe2O3 hollow tube / graphene energy storage electrode composite material prepared by the present invention effectively avoids serious aggregation of itself, significantly improves the conductivity of the electrode, and Fe2O3 and graphene have a reasonable content ratio, which effectively improves the electrochemical energy storage performance of the material. The electrode prepared by the Fe2O3 hollow tube / graphene composite material has a specific capacitance of 426.3F / g at a current density of 1A / g. When the current density is increased to 20A / g, its specific capacitance is still as high as 219.1F / g, with excellent rate characteristics, and the specific capacitance retention rate after repeated charge and discharge for 10,000 times is still 87.7%, reflecting the excellent cycle stability and durability of the material.

The invention belongs to the field of supercapacitors, and particularly relates to a composite nano array material with Se vacancy, an electrode, a supercapacitor and a preparation method thereof. According to the invention, CuO nanorods are directly prepared on a foamy copper (CF) substrate; the preparation method comprises the following steps: by taking CuO as a working electrode, Hg / HgO as a reference electrode, a platinum sheet as a counter electrode and a mixed solution of Ni (NO3) 2.6 H2O, Co (NO3) 2.6 H2O and SeO2 as an electrolyte, depositing NiCo-Se on the surface of CuO on an electrochemical workstation through a cyclic voltammetry method, and synthesizing a CuO-coated NiCo-Se nano array; and soaking the CuO (at) NiCo-Se material in a KBH4 solution to generate a Se vacancy, so as to obtain the high-performance VSe-CuO (at) NiCo-Se electrode material. The specific capacity and the stability of the composite material are remarkably improved through coordinated regulation and control of morphology and components, the energy storage performance and the cycle performance are excellent, an excellent composite electrode material is provided for a supercapacitor, and the preparation method is wide in raw material source, low in price, high in preparation efficiency and wide in application prospect.

The application relates to the technical field of electrode materials, in particular to a nickel-cobalt-aluminum hydroxide as well as a preparation method and application thereof. The preparation method provided by the application comprises the following steps: mixing a soluble nickel source, a soluble cobalt source, a soluble aluminum source, oxalic acid and water, and then performing a hydrothermal reaction to obtain a nickel-cobalt-aluminum oxalate compound precursor with a sheet-shaped self-assembled spherical structure; mixing the nickel-cobalt-aluminum oxalate compound precursor with the sheet-shaped self-assembled spherical structure, water and sodium hydroxide to obtain the nickel-cobalt-aluminum hydroxide. The nickel-cobalt-aluminum hydroxide prepared by the preparation method has excellent electrochemical performance.

The invention discloses carbon composite copper vanadate as well as a preparation method and application thereof, and belongs to the technical field of functional materials. The carbon composite copper vanadate is composed of amorphous carbon and monoclinic Cu < 2. 33 > V < 4 > O < 11 >; the amorphous carbon is carbon of irregular particles with a micron size; the monoclinic Cu2. 33V4O11 is a copper vanadate spherical particle with a micron size. The preparation method of the carbon composite copper vanadate comprises the following steps: putting rice husks or chicken manure into a tubular furnace, carrying out calcination reaction in an argon atmosphere, and cooling to obtain black rice husk carbon or chicken manure carbon; rice hull carbon or chicken manure carbon, sodium vanadate, cupric acetate and sodium chloride are fully mixed, then the mixture is put into a crucible, then the crucible is put into a vacuum furnace, heat preservation reaction is conducted in the argon atmosphere, and the carbon composite copper vanadate is obtained. The two-step preparation process is adopted, the preparation process is easy to control, and cyclic utilization of the rice husks and the chicken manure is achieved. The prepared carbon composite copper vanadate is used as an electrode material and has a good application prospect in the field of supercapacitors.

The invention provides an F-ZIF-67 / PDMS composite film, a preparation method and application thereof, a friction nano-generator and application thereof. The friction nanometer generator is composed of a positive friction layer, a negative friction layer and electrodes. Wherein the negative friction layer is particularly made of an F-ZIF-67 / PDMS composite film, and the positive friction layer is made of a PTFE material; by introducing the ZIF-67 nanoparticles, the dielectric constant of the composite film is remarkably improved, and the friction polarity of the dielectric layer is influenced by performing fluorination modification on the composite film, so that the charge density and the output performance of the friction nano-generator are improved. The friction nanometer generator can efficiently convert mechanical energy in the environment into electric energy and is successfully applied to an electrochemical cathode protection system, the system shows an excellent anti-corrosion effect on steel materials such as Q235 carbon steel, 304SS and A3 carbon steel, and a new solution is brought to the field of corrosion protection.