40 results about "Electrochemistry" patented technology

A method of quantifying glucose in a solution characterized in that electric potential measurement is conducted by potentiometry using a glucose dehydrogenase that requires a flavin compound as a coenzyme. It is preferable to carry out the quantification using a glucose dehydrogenase derived from a filamentous fungus, in particular derived from Aspergillus oryzae or Aspergillus terreus.

The invention relates to a particular multi-layer microporous membrane having a good balance of important properties, including excellent electrochemical stability and low heat shrinkage, while maintaining high permeability and heat resistance, with good mechanical strength, compression resistance and electrolytic solution absorption. Of particular importance when used as a battery separator, the present multi-layer microporous membrane exhibits excellent heat shrinkage, melt down temperature and thermal mechanical properties, i.e. low maximum shrinkage in the molten state. The multi-layer microporous membrane of the present invention is manufactured by layering, such as for example by coextrusion, one or more microporous membrane first layers and one or more microporous membrane second layers, such as on one or both sides of a first layer. The invention further relates to battery separators comprising the multi-layer microporous membrane and batteries utilizing the battery separators.

In an improved electrochemical fuel cell assembly, a reactant flow path extends substantially linearly across the electrochemically active area of an electrode. The electrode has an in-plane nonuniform structure in its electrochemically active area as the active area is traversed in the direction of the substantially linear reactant flow path. Embodiments in which the structure of the fuel cell electrode varies substantially symmetrically along the reactant flow path are particularly preferred in fuel cells in which the flow direction of a reactant is periodically reversed.

In an exemplified lithium ion capacitor, a negative electrode 20 has a first layer 21 and a second layer 22, the first layer 21 and second layer 22 are laminated to each other, and a lithium metal sheet 60 is placed between the first layer 21 and second layer 22, and accordingly one side of the lithium metal sheet 60 in the thickness direction contacts the first layer 21, while the other side in the thickness direction contacts the second layer 22. Since lithium in the lithium metal sheet 60 is easily doped by an active material near a contact part, the fact that both sides of the lithium metal sheet 60 in the thickness direction contact an active material allows for efficient pre-doping and consequent improvement of productivity.

The invention discloses a treatment method of carbon felt for vanadium batteries, which comprises the following steps: oxidizing and activating carbon felt in 60-100 DEG C sulfuric acid for 0.5-4 hours or oxidizing and activating carbon felt in 20-30 DEG C sulfuric acid for 12-48 hours, and washing with water to obtain the activated carbon felt. Compared with other sulfuric acid or nitric acid oxidization methods, the invention firstly uses an alkaline solution to soak and wash the hydrophobic oil adhesive substances influencing the oxidizing process on the carbon felt surface, and then carries out the sulfuric acid oxidizing treatment, thereby increasing the oxo groups and other hydrophilic groups on the carbon felt molecules and enhancing the hydrophilicity and electrochemically active ion adsorption capacity of the carbon felt. The invention has the advantages of short treatment time and favorable carbon felt activation effect, and enhances the electrochemical activity of the carbon felt and the generation current value of the carbon felt as the vanadium battery electrode.

The invention discloses a composite phosphate type anode material for a lithium ion battery, and a preparation method thereof. The composite phosphate type anode material can cause the raw material containing metals, lithium and phosphorus source and/or superfine LiMPO4 and/or superfine Li5-yM'2(PO4)3 to react under inert or reducing atmosphere and high temperature to synthesize LiMPO4 and Li5-yM'2(PO4)3 composite phosphate with combined chemical bonds, and by adding a conductive agent ball grinder, the composite anode material with excellent electrochemical performance can be obtained. The composite anode material prepared by the method has the advantages of low cost, unique process method and good electrochemical performance; the industrialization is easy to achieve.

The invention discloses a surface alkali reduction cladding preparation method of a high nickel material. The method comprises the following steps: washing a high nickel material in a suspension capable of directly forming a precipitate in alkaline environment, carrying out solid-liquid separation, and drying the obtained solid to obtain a final product. The method allows a cladding layer to be formed on the surface of the high nickel material in the washing process, so the amount of residual alkalis on the surface is rapidly reduced, and the cladding layer solves the problem of particle gap increase occurring in the washing process, thereby the processing performances of the material are improved, and the electrochemical performances of the material are further improved.

The invention belongs to the field of anticorrosive paint, and particularly relates to a preparation method of an attapulgite-carbon nitride-polyaniline composite material and anticorrosive paint containing the composite material.The anticorrosive paint is prepared through the steps that one-dimensional attapulgite and two-dimensional graphite-phase carbon nitride are taken as a composite nuclear body material, aniline is polymerized on the surface of the composite nuclear body material to prepare attapulgite-carbon nitride-polyaniline composite anticorrosive packing, and then the attapulgite-carbon nitride-polyaniline composite anticorrosive packing is mixed with polyurethane, a coloring pigment, packing, a dispersing agent, a flatting agent, a defoaming agent and water to prepare the anticorrosive paint.The attapulgite-carbon nitride-polyaniline composite material is applied to the anticorrosive paint and has the multiple effects of preventing electrochemical corrosion and physical corrosion, enhancing the mechanical performance of a coating and the like.

The invention discloses a preparation method of special alumina for high-purity lithium battery separation membranes. The preparation method comprises: preparing boehmite by using aluminum hydroxide as a raw material, using ultrafine aluminum hydroxide as a seed crystal, using ammonia water as an additive and using soft water as a reaction medium through a hydrothermal reaction; carrying out hightemperature calcination on the boehmite to obtain alpha-Al2O3 raw powder; and grinding the alpha-Al2O3 raw powder by a horizontal sander, and carrying out spray drying, or grinding by a jet mill to obtain the alumina for lithium battery separation membranes. According to the present invention, sodium oxide impurities can be removed through the hydrothermal reaction; and the obtained alumina has characteristics of high chemical purity, controllable crystal micro-morphology and relatively narrow particle size distribution, has the Al2O3 content of more than or equal to 99.95%, has the Na2O content of less than or equal to 0.02%, has the contents of impurities such as Fe2O3 and the like of less than or equal to 70 ppm, mainly has spherical and cubic structure, has a specific surface area of 3.5-6.0 m<2>/g, and can meet the requirements of electrochemical performance and safety performance of lithium battery separation membrane materials.

The invention discloses a method for preparing active carbon from biomass, and active carbon prepared by using the method. According to the method, the active carbon with an ultra-high specific surface area is prepared through baking, breaking, rapid stirring and chelating of an appropriate proportion of an activating agent, high-temperature pyrolysis and activation, acid washing and other steps. Compared to active carbon in the prior art, the active carbon of the invention has the advantages of usage of widely available and cheap raw materials, reutilization of the waste, rich pores and ultra large specific surface area, and has important application value in the fields of electrochemistry and pollutant adsorption. The method is simple in steps and suitable for industrial mass production.

This invention relates to a safety Li ionic battery chip, the positive or negative pole plate of said chip is coated with a PVDF microporous layer with low thermal shrinkage rate having good solution absorption ability and an anti-thermal shrinkage function, which can increase the electrochemical and safety property of the chip.

The invention belongs to the technical field of electrochemical materials, and particularly relates to a preparation method of an electromagnetic shielding heat dissipation film. The method comprisesthe following steps of obtaining carbon nanotube films and graphene films; after at least one layer of the carbon nanotube films and at least one layer of the graphene films are alternately laminated,performing hot pressing treatment in a protective gas atmosphere of 2,800-3,000 DEG C for 8-10 hours to obtain a laminated function layer of carbon nanotubes and graphene; obtaining a base layer, andattaching the laminated function layer to one side surface of the base layer by using an adhesive; and obtaining a heat conduction adhesive, and applying the heat conduction adhesive to the other side surface, away from the base layer, of the laminated function layer to form a heat conduction adhesive layer, and obtaining the electromagnetic shielding heat dissipation film. The preparation methodof the electromagnetic shielding heat dissipation film is simple in process, easy to operate and convenient for industrial production and application.

The invention discloses an electrochemical ozonizer comprising at least one cell, each consisting of an anode, a cathode and an interposed full-area, cation-conducting membrane which is chemically stable to ozone as a solid electrolyte, is characterized in that the membrane conductively connects the anode and the cathode while forming flow channels for water that are separated from one another as anode and cathode chambers.

The invention relates to the drug-eluting device field, in particular to a method for preparing holes with different sizes on the surface of a drug-eluting device. The method adopts the technical proposal that the method comprises the following steps that: the drug-eluting device which is made of metallic materials and washed clean is immerged in an etchant solution without oxidbillity for prefabricated hole treatment; a conductive material is taken as a cathode, and the treated drug-eluting device undergoes anodization, so as to prepare holes with a certain size; and another conductive material is taken as a cathode, and the treated drug-eluting device undergoes anodization, so as to obtain holes with another size. The method has the advantages that: the holes are directly prepared on the surface of a body of the drug-eluting device by means of combination of chemistry and electrochemistry; and the method is simple and easy to control.

The invention discloses a preparation method of a dye sensitizer based on phenothiazine. The method comprises the following steps: adding a molar equivalent amount of phenothiazine to a one-mouth flask, dissolving phenothiazine in DMSO, adding 2 molar equivalent amounts of a NaOH solid, carrying out room temperature stirring for 30min, adding 1.6 molar equivalent amounts of 1-bromohexadecane in a dropwise manner under the protection of nitrogen by using a dropping funnel, reacting at room temperature for 24h, carrying out reduced pressure distillation to remove the DMSO, extracting the above reactant with dichloromethane three times, and drying the above obtained organic layer with anhydrous MgSO4 for 8h. The dye sensitizer R adopting a phenothiazine derivative as an electron donor and cyanoacrylic acid as an electron acceptor is synthesized through adopting a phenothiazine molecule as a template and phenothiazine and cyanoacrylic acid as connecting groups, and the dye sensitizer R is soluble in organic solvents, such as chloroform, toluene and tetrahydrofuran. Results of nuclear magnetic resonance verification of the structure of an intermediate for synthesizing the dye sensitizer R, ultraviolet-visible absorption spectrum, fluorescence spectrum and electrochemical performance analysis of the intermediate show that the optical band gap of the intermediate is basically consistent with the electrochemical band gap, so the dye sensitizer can be used as a good luminescent material.

The invention discloses an electrochemical mineral leaching process. The electrochemical mineral leaching process comprises the following steps: (1) crushing an acid-soluble mineral to 100 to 300 meshes; (2) adding water of which the volume is 2 to 10 times the volume of the mineral to the mineral obtained in the step (1) to form slurry; (3) adding an electrolyte to the mineral slurry obtained inthe step (2); (4) inserting an anode plate and a cathode plate into the mineral slurry obtained in the step (3), and afterwards performing direct-current electrolysis for 2 to 12 hours at the voltageof 1 V to 15 V and at a current density of 1 A/m<2> to 300 A/m<2>; and (5) after electrolysis is ended, collecting elements which can be electrodeposited under an acidic condition by using the cathodeplate, and performing solid and liquid separation on the mineral slurry to obtain a material solution. According to the electrochemical mineral leaching process, salt electrolysis is used for replacing acid reaction to perform mineral leaching; the reaction is mild and controllable; the salt electrolysis effect is better than a direct acid solution effect; moreover the amount of salt-containing waste water can be greatly reduced; cyclic utilization is realized; and the electrochemical mineral leaching process disclosed by the invention is applicable to processing of various metal minerals, realizes comprehensive utilization of the minerals and is especially applicable to low-grade minerals.

The invention discloses an electrochemical device and a diaphragm thereof. The diaphragm of the electrochemical device includes a base film and coatings formed on both side surfaces of the base film,wherein the coatings comprise a ceramic coating and a thermal bonding coating, the ceramic coating and the thermal bonding coating which are formed on same sides of the base film do not coincide, andthe thermal bonding coating formed on one side of the base film does not coincide with projection of the thermal bonding coating formed on the other side of the base film on the base film. The diaphragm is advantaged in that after the diaphragm and an electrode plate are subjected to hot pressing, the electrode can be effectively fixed, so production efficiency of a laminated battery core preparation process is improved, moreover, the diaphragm further has advantages of low air permeability value, high conductivity, simple production process and the like.

The invention provides a biogas carbon reduction coupling biogas slurry pollution reduction device and method based on biogas circulation type fermentation, and belongs to the technical field of environment and energy. The device comprises an electric fermentation unit, a solid-liquid separation unit, a hydrothermal carbonization unit and a product collection unit, wherein the electric fermentation unit comprises an electric fermentation tank, a cathode chamber, an anode chamber, a cation exchange membrane and a direct-current constant-voltage power supply; according to the device, biotransformation of hydrogen-philic methanogens and electrochemical cathode reduction are coupled, biogas is circulated to an anaerobic digestion chamber, in-situ biogas biological purification is carried out, ammonia nitrogen and COD in biogas slurry are removed in an anode chamber while CO2 is reduced at a cathode to generate methane, and electron transfer and conservation rules are reasonably utilized; the biogas slurry can be used for irrigation after pollution reduction, and residual pollutants in the biogas slurry can also be adsorbed by biogas residue biochar to be further purified; the biogas residues can be prepared into hydrothermal carbon to be reused for anaerobic digestion or used as an adsorbent, so that the aims of comprehensive utilization of biogas slurry, biogas residues and biogas and CO2 emission reduction are fulfilled.

The invention discloses a system for monitoring heavy metals and a microbial electrochemical sensor. The system comprises the microbial electrochemical sensor, a first liquid storage tank for accommodating anode matrix liquid, a second liquid storage tank for accommodating cathode matrix liquid, a peristaltic pump, an electrochemical workstation, a computer, a variable resistance box and an external circuit. The microbial electrochemical sensor provided by the invention is an improved MFC, and can automatically output an electric signal without an external power supply.