62results about How to "Reduce Ohmic Polarization" patented technology

The invention discloses a bi-functional catalyst for an alkaline water system metal / air battery and a preparation method thereof. The catalyst is a core-shell structure material formed by coating transition metal simple substance particles by nitrogen doped carbon; the preparation process is: taking transition metal salt and urea as raw materials, obtaining precursors of transition metal simple substance particles through a hydrothermal method, coating nitrogen contained polymers on the surfaces of the precursors through in situ polymerization, and carrying out high-heat treatment to obtain the catalyst. The catalyst is good in stability, has bi-functional catalytic activity (ORR and OER) and has high catalytic activity in alkaline environment; the preparation technology is strong in controllability and easy in repetition and satisfies the industrial production demand.

The invention relates to a flow energy storage battery structure, characterized in that an infill panel is arranged between a bipolar plate and a porous electrode in an electrode frame, the infill panel is made from carbon materials with good electrical conductivity and low porosity or metal materials which are stable in acidic mediums, reduces the body resistances of the electrodes and electrolyte and contact resistance between the electrode bipolar plates to finally reduce the ohmic resistance of the flow energy storage battery. According to the invention, the energy efficiency and voltage efficiency of the flow energy storage battery are raised, so that the working current density is raised, and the weight, volume and cost of the battery with same output power are greatly reduced.

The invention discloses a zinc cathode active substance of a zinc-nickel secondary battery and a preparation method and application method thereof. The preparation method of the active substance comprises the following steps: (1) dissolving In2O3 in concentrated hydrochloric acid; (2) dissolving ZnCl2 in deionized water and adding dispersant; (3) mixing the two solutions and diluting with deionized water; (4) adding ammonia water dropwise into the mixed dilute solution to regulate pH while strongly stirring mechanically, then stirring and aging; (5) performing ultrasonic dispersion on the aged liquid, transferring to a hydro-thermal reaction kettle and putting the reaction kettle in an oven for heat preservation; and (6) filtering, washing and drying the precipitate, and calcining at certain temperature to obtain indium-doped zinc oxide. The active substance can reduce the deformation of the zinc cathode, suppress the dissolution of the active substance of the zinc cathode and prolong the cyclic service life of the zinc-nickel secondary battery.

The invention belongs to the technical field of energy storage batteries and particularly relates to a liquid energy storage battery monomer structure with floating body electrolytes. The battery monomer structure comprises a seal housing, a crucible base, a sleeve pipe, a positive and negative current collector, a negative metal electrode, a positive electrode, liquid electrolytes and solid electrolytes, and three layers of liquid are automatically layered due to density difference and immiscibility. All the electrodes in the battery monomer structure are in a liquid form except for solid electrolyte sheets, and the mounting operation is convenient; a battery monomer is not limited by capacity, required materials are all conventional materials, and the preparation cost of a battery is low; and the prepared battery has a special battery structure and electrode characteristics and is long in working life. Therefore, the battery monomer structure is very suitable for the field of energy storage.

The invention belongs to the technical field of lithium ion batteries and particularly relates to a preparation method of a winding lithium ion battery. The preparation method comprises the following steps of: coating anode paste on an anode current collector, drying and then cold pressing the anode paste, and then bending an anode plate to be V-shaped; processing an cathode plate with the same steps, placing the bent anode plate and the bent cathode plate in a crossing way, placing a diaphragm between the anode plate and the cathode plate, welding and connecting the anode plate by virtue of an anode pole ear, and welding and connecting the cathode plate by virtue of a cathode pole ear, thus obtaining a pole plate group; winding the pole plate group to form a battery cell, placing the battery cell in a packaging bag, and performing injection and formation to obtain the lithium ion battery. Compared with the prior art, the preparation method decreases the resistance of the pole plates through bending the pole plates, thus reducing ohmic polarization in a charge-discharge process, improving the consistency of the battery, and obviously reducing the gas production speed of joule heat and side reaction in the charge-discharge process so as to improve the power multiplying performance and prolong the cycle life of the lithium battery and a lithium ion battery pack.

A method for producing a manganese dioxide electrode of a supercapacitor is characterized in that the production process of the electrode comprises the following steps of: firstly, co-depositing a manganese alloy coating on the surface of an electrode current collector by electrochemistry; and secondly, carrying out anodic oxidation treatment on the electrode with the manganese alloy coating to obtain the manganese dioxide electrode. According to the method disclosed by the invention, the uniform distribution of alloy elements inside the electrode is realized by electrochemistry co-deposition so as to increase the electronic conductivity of the alloy elements in the anodic oxidation and charging and discharging process. Due to the utilization of anodic oxidation, on one hand, manganese in the alloy layer is converted into a manganese dioxide material with the electrochemical activity; and meanwhile, pore path structures can be constructed on the surface and the inside of the produced electrode, and so that the solid phase mass transfer characteristic and the electrochemical reaction activity of materials are improved and the electrode with high specific capacitance is obtained.

The invention provides prodn. method of core component of proton interchange film full cell. The characteristic is to chemical reduct presoma salt of catalytic agent in aqueous solution of sulphonic acid type negative ion polymer with proton conducting ability to obtani ion modified nanometre catalytic agent particles, then to transfer ion modified nano catalytic agent particles to proton interchange film by method of brushing, ink-jet printing or transfering, or to fully mix ion modified nano catalytic agent and ethanediol, then to transfer it to proton interchange film or to static delectricity self assembly positive ino polymer on proton interchange film at first, then to soak the proton interchange film processed by positive ion polymer to aqueous dispersing liquid of ion modified nano catalytic agent to obtain core component used for proton interchange film fuel cell.

The invention discloses a novel fuel cell manufacturing method based on a graphene thermoelectric management layer. The method comprises the following steps: forming a micron-grade concave-convex structure on a proton exchange membrane; preparing a catalytic layer on the surface of the proton exchange membrane with the concave-convex structure; preparing the thermoelectric management layer on the surface of the catalytic layer; preparing a diffusion layer on the surface of the thermoelectric management layer; and manufacturing a single cell in a flow field fixture. The thermoelectric management layer based on graphene has ultrahigh electronic conductivity and ultrahigh heat conductivity, so that electrons generated in an electrochemical reaction process of the fuel cell catalytic layer and required electrons can be exported and imported rapidly; electrochemical polarization and ohmic polarization are reduced; and the output performance is enhanced. Moreover, a large amount of waste heat generated by a catalyst can be discharged rapidly, and a stable electrochemical reaction is maintained. Meanwhile, the temperature and an electric field in the catalytic layer can be balanced, and the service life is prolonged. Moreover, a manufacturing process is simple and controllable, and suitable for industrial production.

The invention provides a pole piece and an application thereof, and a low temperature rise safety lithium ion battery containing the pole piece, the pole piece comprises a current collector, and at least two active coatings and at least one efficient conductive PTC film are fixedly arranged on each of two opposite surfaces of the current collector; the active coating and the efficient conductive PTC film are arranged at intervals from inside to outside from the surface of the current collector, and the outermost side is the active coating; the conductivity of the active coating on the outermost layer is smaller than that of the other active coatings, and / or the active substance of the active coating on the outermost layer adopts an active substance with high thermal stability. According tothe pole piece disclosed by the invention, the internal temperature distribution is more uniform, the temperature rise of conventional use or internal short circuit of the battery is reduced, and thermal runaway can be slowed down, so that the safety of the lithium ion battery is improved.

The invention relates to a negative electrode active material for a secondary battery, a preparation method and the secondary battery thereof, belonging to the technical field of batteries. The active material comprises graphite nano-thin sheets and SnO2 nanorods which are uniformly arranged between sheet layers of the graphite nano-thin sheets, wherein the mass fraction of the graphite nano-thin sheets is 5-90%, and the length of the nanorods is 30-500nm. The preparation method comprises the following steps of: adding the graphite thin sheets into a mixed water solution containing urea, SnCl4.5H2O and thioglycolic acid; performing ultrasonic processing on the obtained mixed water solution; transferring the mixed water solution after ultrasonic processing into a high-temperature and high-pressure container and reacting at certain temperature; and performing centrifugation or filtering separation on the solution after reaction, and drying to obtain an SnO2 nanorod array / graphite nano-thin sheet composite. The negative electrode active material for the secondary battery, which is prepared through the preparation method disclosed by the invention, has stable performance and can be used as the negative electrode material for a lithium ion battery, and the reversible specific capacity is high.

The invention discloses a preparation method of a self-humidifying ordered polymer membrane electrode, belonging to the technical field of membrane electrode preparation. An ordered ion exchange polymer nanotube array prepared through the method is fused together with a polymer membrane and is provided with highly ordered ion, electron and gas mass transfer channels, and electrochemical three-phase reaction interfaces are distributed in the outer surfaces of polymer nanotubes with water storage functions, so that a high-efficiency energy conversion process can be carried out in a self-humidifying manner. A catalyst in a nanoparticle or microparticle state is bonded on the surface of the ion exchange polymer nanotube array to form a catalysis layer and is relatively high in specific surface area and catalytic activity, so that the three-phase reaction interfaces of the membrane electrode are greatly added, the electrochemical polarization, the ohmic polarization and the concentration polarization of the electrode are reduced, the energy conversion efficiency is improved, and the reaction speed is increased. According to the preparation method, a membrane electrochemical reactor system is expected to be remarkably simplified, the energy conversion efficiency and the stability are improved, and the operation life is prolonged.

The invention relates to the field of electrochemistry and negative electrode material of lithium ion battery, and discloses a silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The silicon-carbon composite material comprises a matrix material, nano-silicon loaded on the surface of the matrix material and a coating carbon layer coated on an outer layer, wherein the coating carbon layer comprises an amorphous carbon layer and a conductive agent dispersed in the amorphous carbon layer. The silicon-carbon composite material of the invention is used as the negative electrode active material of the lithium ion battery, and the prepared lithium electron battery has good first-time efficiency and cycle stability, and obviously good comprehensive performance.

The invention relates to preparation and application of a hydrogen evolution electrode with low noble metal loading capacity. The preparation method comprises the following steps: taking foamed nickelas a substrate, cleaning the foamed nickel, etching the foamed nickel in an acidic solution containing chloride ions to form layered nano flaky nickel hydroxide perpendicular to the surface of the foamed nickel on the surface of the foamed nickel, and chemically depositing trace platinum or iridium nano particles between the layered nickel hydroxide to prepare the efficient hydrogen evolution electrode. The hydrogen evolution electrode prepared by the method has excellent alkaline and neutral hydrogen evolution activity and stability, and is applied to metal / seawater batteries and water electrolysis hydrogen production.

The invention discloses a novel fuel cell based on graphene thermoelectric management layers. The novel fuel cell comprises a flow field plate, a diffusion layer, an anode catalytic layer, a proton exchange membrane, a cathode catalytic layer, a diffusion layer and a flow field plate, wherein the anode catalytic layer and the cathode catalytic layer both belong to catalytic layers, the novel fuel cell is characterized in that the graphene thermoelectric management layers are arranged between the anode catalytic layer and the diffusion layer and between the cathode catalytic layer and the diffusion layer and are prepared by mixing graphene, an alcohol solvent and a dispersing agent, and micro-sized concave-convex structures are arranged on the front surface and the back surface of the proton exchange membrane. The graphene-based thermoelectric management layers have ultrahigh electron conduction rate and ultrahigh thermal conduction rate, electrons generated during the electrochemical reaction process of the catalytic layers of the fuel cell and required electrons can be rapidly exported and imported, electrochemical polarization and ohmic polarization are reduced, and output performance is improved; moreover, a large amount of waste heat generated by a catalyst can be rapidly discharged, and stable electrochemical reaction is maintained; and meanwhile, temperature and electric field in the catalytic layers also can be balanced, and the service life of the fuel cell is prolonged.

The invention relates to an anode applied to a direct hydroboron fuel battery and a preparation method of the anode. The anode consists of a catalyst layer and a diffusion layer which are mutually overlapped, wherein the diffusion layer is characterized in that a carbon material or foamed nickel is used as a substrate, and a leveling layer of which the surface is of a micro columnar structure is formed on the substrate; the catalyst layer is that an electrocatalyst for catalyzing a hydroboron to oxidize, and a mixture of a hydrogen evolution inhibitor and an adhesive are used as the raw materials for preparing the catalyst layer on the surface of the leveling layer. The anode prepared by adopting the method has the advantages that the electrochemical reaction area is expanded, the area of an interface between a gas diffusion layer and a catalytic active layer is increased, the active resistance and the ohmic resistance are reduced, the fuel utilization rate is increased, and the performance and the stability of the direct hydroboron fuel battery are improved.

The LiCoO2 type negative elective electrode possessing the compound structure is prepared from the substrate powder of the negative electrode, the organic matter and the inorganic pore creating materially bu using the strip casting method. The structure formula of the power of the negative electrode is expressed as follows: LiCo1-xMxO2, here M is one or more among earthy elements Be, Mg, Ca or Sr; x is equal to 0.05-0.10. The proportioning by weight between the powder of the negative electrode and the organic matttter as well the inorganic pore creating material is 6:1-3. The invented negative electrodes decrease the solubility of the negative electrode in the molten carbonate greatly and increase stability as well as prolong the service life of the batties. Moreover, the electric conductance of the negative electrodes is increased.

The invention provides a method for preparing solid electrolyte membrane with a high lithium-ion migration number and relates to a method for preparing a solid electrolyte of a lithium-ion battery. The problems of low safety and low lithium-ion migration number of a lithium-ion battery prepared by an existing method are solved. The method comprises the steps of (1) the pretreatment of raw materials, (2) the preparation of raw material slurries, (3) the mixing of the slurries to remove bubbles, and (4) the preparation of the solid electrolyte membrane. The solid electrolyte membrane prepared bythe invention has a lithium-ion migration number of 0.77 and an electrochemical stability window of 4.04V, good reversibility and good compatibility with an electrode are exhibited in a cyclic voltammetry test, the safety performance and lithium-ion migration performance are good, the preparation is simple, the cost is low, and the method is applied to the field of lithium-ion batteries.

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.

The invention relates to a preparation method of an alkaline anion exchange membrane, which comprises the following steps of: respectively dissolving an anion exchange resin precursor and a functionalization reagent in an oil phase and a water phase, carrying out functionalization reaction at a two-phase interface by using the resin precursor and the functionalization reagent, and carrying out in-situ self-assembly to form the membrane. According to the method, the problem of gel generated in a traditional homogeneous solution functionalization reaction is solved, and the prepared alkaline anion exchange membrane is high in ordering degree, has hierarchical pore distribution and is controllable in thickness; and the membrane has high ionic conductivity and good water transport characteristics, and has good performances when used in alkaline anion exchange membrane fuel cells.

The invention discloses a PEM water electrolysis proton membrane and CCM integrated preparation process and equipment, the equipment adopts a combination of multiple nozzles and a slit type coating head, the multiple nozzles can independently spray different components of a catalyst layer multi-component composite slurry within an ultra-short time, the spraying rate and atomization degree of the different components are accurately controlled, and the production efficiency is improved. The problem of poor dispersibility of different catalysts and binders in the catalyst slurry in the same solution is solved; the preparation process comprises the following steps of: sequentially compounding the base membrane pretreatment layer, the catalyst layer 1, the functional layer 1, the composite reinforced membrane, the functional layer 2, the catalyst layer 2 and the like on the substrate to realize the integrated preparation of the PEM water electrolysis composite reinforced membrane and the CCM catalyst layer; and finally, the PEM membrane electrode has relatively low surface resistance, relatively high conductivity, mass transfer rate and chemical durability, so that the cost of PEM electrolyzed water is reduced, and the service life is prolonged.

The invention provides a modification preparation method of a hard carbon negative electrode material with high first efficiency and long cycle life. The modification preparation method comprises the following steps: S1, premixing 10 parts of NMP and 10 parts of medium-temperature coal tar pitch; S2, placing 40 parts of biomass hard carbon in 30-60 parts of an organic solution, performing stirring to prepare a suspension, adding 2.4-4.8 parts of the carbon tube slurry into the suspension, and performing uniform stirring; S3, adding the premixed asphalt solution in the step S1 into the mixture obtained in the step S2, and performing uniform stirring; S4, heating and evaporating the mixture obtained in S3 to dryness, performing roasting and cooling in a CAD furnace under the protection of inert gas, and performing screening to obtain the modified hard carbon negative electrode material for the sodium-ion battery. The prepared modified hard carbon negative electrode material has the advantages of being high in first efficiency and long in cycle life, and in addition, the preparation process is convenient to operate, low in cost and suitable for industrial production.

The invention relates to a preparation method of a high-conductivity flexible graphite bipolar plate for a flow battery, which comprises the following steps of: uniformly mixing expanded graphite powder and PVDF powder in a mixer according to a high loading coefficient, carrying out cold pressing to obtain a low-density blank, and carrying out vacuum hot pressing or rolling to obtain the high-density bipolar plate finished product. According to the bipolar plate prepared by the invention, the toughness and the high conductivity of the flexible graphite plate are maintained, the ohmic polarization of the flow battery can be remarkably reduced, and the power density of the flow battery is improved; by adding the polymer, the liquid resistance is improved, the preparation method is simple, and batch preparation is easy.

The invention discloses a cobalt disulfide nanocrystal / graphene composite electrode material and a preparation method thereof. The composite electrode material comprises a load skeleton of single-layer graphene, and a cobalt sulfide nanocrystal layer and a single-layer graphene layer which are stacked on the upper surface and the lower surface of the load skeleton layer by layer. According to the cobalt disulfide nanocrystal / graphene composite electrode material and the preparation method thereof, combine the two substances to obtain the novel composite electrode material with good structure optimization performance. The electrode material is low in cost; efficient in manufacturing; uniform in grain distribution and high in electrochemical capacity. The electrode material has excellentconductivity, high specific surface area and good stability.

According to a method for improving the electrocatalytic activity of the negative electrode of an all-vanadium redox flow battery, a certain amount of silver ions are added into the negative electrode electrolyte of the all-vanadium redox flow battery, so that the electrochemical activity of a V <2+> / V<3+> reaction is improved, the electrochemical polarization of a redox flow energy storage battery is reduced, meanwhile, the electrode internal resistance can be reduced, and the voltage efficiency, the energy efficiency and the working current density of the battery are improved.

The invention discloses a cathode catalyst of proton film fuel battery in the electrochemical technique domain, which is characterized by the following: each composition and weight percentage is 1-50 percent Pt, 20-80 percent Zr1-xMxO2 and 10-50 C, wherein the x is mole rate between 0.1 and 0.5; the catalyst making method comprises the following steps: adapts soft chemical method to synthesize nanometer-level Zr1-xMxO2; mixing the nanometer-level Zr1-xMxO2 with nanometer-level Pt / C at mole rate of Pt:M=1:1-5. The invention reduces the electrochemical polarization, Ohm polarization and mass tr ansfer polarization effectively, which increases the catalytic efficiency to improve the battery property.

The invention belongs to the field of copper slag resource utilization, and discloses a method for preparing iron silicon from molten salt electric deoxidised copper slag. The method comprises the following steps of firstly, carrying out mechanical ball milling treatment on the copper slag to obtain copper slag powder; carrying out magnetic separation treatment on the copper slag powder to obtain magnetic separation tailings, pressing the magnetic separation tailings into sheets to prepare cathode sheets, and sintering the cathode sheets under the protection of inert gas; under the protection of the inert gas, enabling electrolyte to be pretreated to obtain molten salt electrolyte, and placing the cathode sheets in the molten salt electrolyte for electrolysis; and under the protection of the inert gas, taking out a cathode product after electrolysis, cooling to room temperature, washing, and carrying out vacuum drying to obtain an iron-silicon-based alloy. According to the method, comprehensive recycling of metal iron and silicon resources in the copper slag can be achieved, the operation process is simple, compared with the prior art, the recycling cost is reduced, no harmful gas is discharged, and the product purity is high.

The invention relates to the technical field of cosmetics, and discloses a skin care mask capable of reducing heavy metal pollution. The skin care mask is prepared from the following raw materials inparts by weight: 4-6 parts of purified konjac powder, 1-4 parts of carrageenan powder, 0.25-0.75 part of polyethylene glycol, 0.01-0.03 part of hyaluronic acid, 0.007-0.013 part of sorbitol, 0.01-0.03part of lactic acid, 0.5-1.5 parts of zero-valent iron powder, 0.3-0.7 part of biomass carbon powder, 0.08-0.12 part of graphene oxide and 4-8 parts of deionized water. According to the skin care mask capable of reducing the heavy metal pollution, heavy metal ions can be adsorbed, oxidized and removed by forming an iron-carbon microbattery, so that the problem that heavy metal elements are accumulated in the face can be fundamentally solved, meanwhile, reaction heat has a heat preservation effect on the mask, the skin care effect of the mask can be conveniently and efficiently exerted, and aguarantee is provided for human health.

The invention belongs to the field of a thermal battery, and particularly relates to a composite electronic conductive agent for a thermal battery positive electrode material. The constituents of thecomposite electronic conductive agent are as follows: 10-45% of iron powder, 10-45% of cobalt powder and 10-45% of nickel powder. Through performance test of the thermal battery, 1-4% of composite electronic conductive agent is added into a thermal battery sulfide positive electrode material containing Fe, Co and Ni, and the large current-resistant density bearing capability and the output capacity of the battery can be improved by 6% or above. For example, 1.5% of composite electronic conductive agent is added into the thermal battery composite Fe<0.5>Co<0.5>S2 positive electrode material, the large current-resistant density bearing capability and the output capacity of the battery can be respectively improved by 10% and 6%.

The invention belongs to the technical field of energy storage batteries and particularly relates to a liquid energy storage battery monomer structure with floating body electrolytes. The battery monomer structure comprises a seal housing, a crucible base, a sleeve pipe, a positive and negative current collector, a negative metal electrode, a positive electrode, liquid electrolytes and solid electrolytes, and three layers of liquid are automatically layered due to density difference and immiscibility. All the electrodes in the battery monomer structure are in a liquid form except for solid electrolyte sheets, and the mounting operation is convenient; a battery monomer is not limited by capacity, required materials are all conventional materials, and the preparation cost of a battery is low; and the prepared battery has a special battery structure and electrode characteristics and is long in working life. Therefore, the battery monomer structure is very suitable for the field of energy storage.

The invention relates to the field of chemical power supply and electrochemical catalysis, in particular to a construction method of a functional graphite felt and an application thereof in a vanadiumbattery. Firstly, graphitizing the raw felt at high temperature to obtain a graphite felt substrate with excellent electrical conductivity; Functional nanofibers were deposited on the carbon fiber surface of graphite mat substrate by pyrolysis treatment in carbon source atmosphere to form graphite mat / nanofiber composite electrode with high conductivity, specific surface area and electrocatalyticactivity. The invention mainly performs functional design on the conductive layer and the activated layer according to their roles in the electrode reaction process, further finishes the preparationof the high-performance graphite felt through graphitization and pyrolysis treatment, and successfully solves the contradiction between the conductivity and the electrochemical activity of the carbonfiber felt at the present stage. The ohmic polarization and electrochemical polarization in the reaction process of vanadium battery can be greatly reduced by using the functional graphite felt as thepositive and negative electrode materials of vanadium battery, and the charging and discharging performance of vanadium battery can be further improved.