89results about How to "Reduce electrode polarization" patented technology

The invention discloses a preparation method of a nano-network conductive polymer coated lithium iron phosphate anode material. The preparation method is characterized in that: a surfactant is used as a template; and a conductive polymer monomer is subjected to in-situ polymerization on a lithium iron phosphate surface in a low-temperature acid solution medium and a nano-network structure is grown; and thus, the nano-network conductive polymer coated lithium iron phosphate anode material is formed. The special shape of the nano-network conductive polymer is favorable for a current carrier to be conducted among polymer aggregate particles; and the nano-network conductive polymer has high current carrier mobility ratio, and can effectively connect surfaces among lithium iron phosphate particles when coated on the lithium iron phosphate surface to form an effective conductive network, so the lithium iron phosphate conductivity is significantly improved, and the contact resistance and electrode polarization among the particles are reduced to ensure that the electrochemical performance of an electrode material is greatly improved. The preparation method has a simple process and readily-available raw materials, and is suitable for carrying out industrial large-scale production.

The invention provides a high-nickel ternary cathode material coated with a fast ion conductor and a preparation method thereof. The high-nickel ternary cathode material is spherical or spheroidic secondary particles composed of primary particles, the diameter of the high-nickel ternary cathode material is 1-30 [mu]m, and the chemical formula of the high-nickel ternary cathode material is LiNi0.8Co0.1Mn0.1O2. The preparation method comprises the following steps of: weighing raw materials for synthesizing the fast ion conductor in proportion, and uniformly dispersing the raw materials in a solvent to obtain a mixed solution; adding the high-nickel ternary precursor into the mixed solution, and then performing stirring, drying and grinding to obtain high-nickel ternary precursor powder coated with the fast ion conductor; and uniformly mixing the obtained precursor powder with a lithium salt, and performing sintering to obtain the high-nickel ternary cathode material coated with the fastion conductor. The fast ion conductor material is used as a coating substance of the ternary cathode material and can provide a fast transmission channel for lithium ion transmission, so that the purpose of reducing the internal resistance of the battery is achieved; and after coating, the cycling stability of the battery is improved under the condition that the specific discharge capacity of thebattery is not reduced.

The invention discloses a preparation method of a lithium iron phosphate anode material co-coated by conducting polymer/nanometer metal particles. The preparation method comprises the following steps of: (1) sufficiently diffusing a polymer monomer and lithium iron phosphate powder in an acid solution, so as to obtain a mixed solution A, wherein the polymer monomer is one or a combination of more than one of aniline, pyrrole, thiophene and 3,4-ethylenedioxythiophene; (2) adding a metallic compound in the mixed solution, and sufficiently diffusing to obtain a mixed solution B, wherein the metallic compound is one of silver nitrate, nickel nitrate, nickel sulfate, copper nitrate, copper sulfate, chloroauric acid and chloroplatinic acid; and (3) adding an oxidant in the mixed solution B, carrying out ultrasonic water bath on the obtained reaction mixtures at a temperature of 0-30 DEG C for 1-4 hours; standing for 1-2 hours at the room temperature, filtering, washing and drying so as to obtain the lithium iron phosphate anode material co-coated by the conducting polymer/nanometer metal particles by. The material provided by the invention has the advantages of high material capacity and good rate capability.

The invention discloses a bipolar pulse current excited resistance chromographic imaging data collecting system, and its character: in sequence, it has resistance data collecting sensor, resistance measuring module, data collecting module, data communication module and MCU control module, where the MCU control module is connected with the resistance measuring module, data collecting module, data communication module, the electrodes of the resistance data collecting sensor are connected with the input end of the resistance measuring module by high frequency screening wires. The invention implements the integration of resistance measuring circuit with data collecting system, micro-computerization of data collecting system and modularization of communication system.

The invention discloses a power lead storage battery. The power lead storage battery comprises a positive plate and a negative plate, wherein the positive plate comprises a positive grid and positivelead plaster, and the negative plate comprises a negative grid and negative lead plaster. The power lead storage battery disclosed by the invention has the advantages that carbon nanotubes are used toreplace activated carbon and acetylene black adopted in the traditional art, so that the current density and the electrode polarization during discharging are effectively reduced, a smaller internalresistance of the battery is achieved, the lead plaster porosity is increased, and the lead plaster utilization efficiency and the charge acceptance are improved; and titanium nitride, which has a high melting point, high intensity, high hardness, high acid and alkali corrosion resistances, high wear resistance, high pyrochemical stability and excellent electricity-conducting and heat-conducting performances, is added to prevent the forming of a passivation layer between each grid and the corresponding lead plaster, so that early capacity fading of the storage battery can be avoided, and the overall service life of the storage battery can be prolonged.

The invention provides a silicon-based composite material and a preparation method thereof. The silicon-based composite material provided by the invention comprises a silicon-based matrix, a fast ionconductor layer coating the surface of the silicon-based matrix, and a carbon layer coating the surface of the fast ion conductor layer. A fast ion conductor of the fast ion conductor layer is LiAlSixOy, x is greater than or equal to 1, and y is greater than or equal to 1. According to the invention, the specific fast ion conductor layer LiAlSixOy and the carbon coating sequentially coat the surface of the silicon-based matrix, so that problems of relatively high charge transmission impedance and relatively low power output of the silicon-based negative electrode material are effectively improved, and the rate capability is improved; and meanwhile, the specific double coating layers are matched, so that the expansion of the silicon-based material is effectively relieved, and the cycle performance is improved.

The invention discloses a water-based soy protein-based supramolecular sulfur positive electrode binder and a preparation method and application thereof. The binder is prepared from phosphorylated soybean protein, a lithium ion transmission promoter and a physical cross-linking agent through a physical blending method. The binder has a three-dimensional network cross-linked structure and the characteristics of the raw materials so that the binder has excellent mechanical properties, high ionic conductivity, strong lithium polysulfide adsorption capacity and certain biodegradability. When the binder is applied to the lithium-sulfur battery, the cycle life, the rate capability and the specific capacity of the battery can be effectively improved. A physical blending preparation method is used, a phosphorylated soybean protein aqueous solution, a lithium ion accelerant aqueous solution and a physical cross-linking agent aqueous solution are directly mixed to obtain the binder which is cross-linked by intermolecular hydrogen bonds and has a three-dimensional network structure, the process conditions are simple, efficient and convenient, and no pollution is caused to the environment whenwater is used as a solvent.

The invention relates to a battery cathode diachylon formulation high in utilization rate of active substance and a preparation method of the battery cathode diachylon formulation and belongs to the technical field of lead-acid storage batteries. The the battery cathode diachylon formulation comprises dilute sulfuric acid of 1.38g/ml in density, deionized water, lignin Vanisperse AT, polyaniline potassium sulfonate PAN-K, nano hollow barium sulfate, acetylene black, emulsion carbon naotube Sus-CNT and lead powder. On the basis of a conventional cathode diachylon formulation, water-soluble PAN-K is adopted to completely replace conventional polyester staple fiber, nano hollow barium sulfate is adopted to completely replace conventional precipitated barium sulfate, and the emulsion carbon nanotube Sus-CNT is adopted to partly replace deionized water for paste mixing. On the premise that circulating life of a cathode produced by the formulation is not shortened, active substance utilization rate and charging receiving capability of the cathode are remarkably improved, and the battery cathode diachylon formulation is about to have great application and popularization prospect in the field of lowering weight of active substance of the cathode and lowering manufacturing cost of the lead-acid storage batteries.

The invention discloses a zinc oxide/nickel composite micron rod electrode material and a preparation method thereof. The method includes, preparing a precursor by taking a mixed solution of zinc nitrate, nickel nitrate and ethylenediamine as a raw material through a homogeneous precipitation method; and then calcining the precursor in a hydrogen argon mixed reduction atmosphere to prepare the zinc oxide/nickel composite micron rod material. The material has the advantages of high initial coulomb efficiency, high reversible capacity, good cycle stability and the like when the material is usedas a lithium ion battery cathode material.

The invention relates to a method for preparing an anode material of a lithium battery and aims to provide a method for preparing a conductive carbon film-coated calcium or calcium-tin alloy serving as the anode material of the lithium battery. The method comprises the following steps of: melting high-purity calcium metal or calcium metal and tin metal, spraying into polyethylene glycol liquid byusing high purity argon, and cooling fog drops in the polyethylene glycol liquid to obtain spherical powder; carbonizing polyethylene glycol to obtain a carbon coated calcium material; filtering out the carbon coated calcium material; calcining again in vacuum or high purity nitrogen atmosphere at the temperature of below 700 DEG C; further carbonizing to remove residual polyethylene glycol on the carbon coated calcium material; and cooling to obtain the conductive carbon film-coated calcium serving as the anode material for preparing the lithium battery. A conductive carbon film is formed onthe surfaces of the calcium or calcium-tin alloy particles and is favorable for the stability of an electrode structure. A gas spraying method for preparing the carbon coated material is favorable for scale production and cost reduction.

The invention discloses a lead-carbon composite material, and a preparation method and an application thereof. The preparation method comprises the following steps: processing an organic carbon source to prepare a solution, adding lead powder, grinding, uniformly mixing, and drying to obtain mixed powder; and adding concentrated sulfuric acid to the mixed powder under stirring, allowing the obtained solution to stand for carbonization for a period of time, washing, and drying to prepare the lead-carbon composite material, wherein the mass fractions of carbon and lead in the lead-carbon composite material are 0.1-25% and 75-99.9% respectively. The invention also discloses the lead-carbon composite material prepared through the preparation method, and the application of the composite material. The method has the advantages of simplicity, low cost and low energy consumption, and lead carbon batteries made by using the composite material have substantially longer heavy current charge and discharge life and higher mass specific power than present lead acid storage batteries.

The invention relates to the field of lithium batteries, and discloses a method of preparing a silicon-carbon negative electrode material by doping nickel-silver alloy particles, which comprises the following steps of: (1) carrying out ball milling on raw material micron-sized silicon powder to prepare nanoscale silicon powder, (2) mutual mixing of the nanoscale silicon powder and the nickel-silver alloy particles and adopting a solid-phase mixing method, (3) forming an amorphous carbon coating layer on the surfaces of the nano silicon powder and the nickel-silver alloy by adopting liquid-phase coating, (4) carrying out high-temperature sintering on the coating material in an inert gas protection furnace, (5) preparing a silicon-carbon material with proper granularity by adopting a mechanical ball milling method, and (6) mixing the silicon-carbon material and commercial graphite to prepare the silicon-carbon negative electrode material. According to the preparation method, the first coulombic efficiency and the cycle performance of the material are obviously improved, the process is simple, efficient and environmentally friendly, and large-scale production of the silicon-carbon negative electrode material is facilitated.

The invention discloses a preparation method and application of a ZnO/C nano composite microsphere material with a capsule structure. The method comprises the steps of heating a mixed aqueous solutionof zinc chloride, resorcinol, formaldehyde and hydrochloric acid in a water bath to react to generate gel, fully drying the gel, calcining in an air atmosphere, and carbonizing in an argon atmosphereto obtain a product. When the ZnO/C nano composite microsphere material with the capsule structure is used as a negative electrode material of a lithium ion battery, the capsule microsphere structurecan effectively inhibit pulverization failure of a ZnO active material, reduce the generation of a solid electrolyte interface (SEI) film and improve the electrode reaction kinetic performance, thereby improving the cycling stability, Coulombic efficiency and high-rate capacity of the material.

The invention discloses a button cell with a base. The button cell with the base comprises a negative electrode cover, a positive electrode shell, a sealing ring, a positive electrode, a diaphragm, anegative electrode and electrolyte; the sealing ring is in sealed connection with the negative electrode cover and the positive electrode shell; furthermore, the negative electrode cover and the positive electrode shell form a sealing cavity; the positive electrode, the diaphragm, the negative electrode and the electrolyte are arranged in the sealing cavity; the button cell further comprises an energy gathering ring arranged in the positive electrode shell; the energy gathering ring comprises an outer annular wall, an inner annular wall and a top wall used for connecting the outer annular wallto the inner annular wall; the outer annular wall, the inner annular wall and the top wall form an annular cavity; the top wall and the sealing ring are in abutting joint; a first through hole, through which electrolyte and/or gas go/goes in and out, is arranged on the annular cavity; and the positive electrode part is positioned in the inner ring of the energy gathering ring. According to the button cell with the base, because the energy gathering ring with the annular cavity is arranged, the capacity and the discharging power of the cell are improved; the working temperature range is expanded; the global stability, the storage property, the consistency and the leakproof property of the cell are improved; and the service life of the cell is prolonged.