82results about How to "Improve the electrochemical reaction rate" patented technology

The invention discloses a nano silicon/porous carbon composite anode material of lithium ion batteries as well as a preparation method and an application of the composite anode material. The composite anode material is a core-shell structure material consisting of a porous nano silicon particle core and a porous carbon layer shell. The preparation method of the composite anode material comprises the steps as follows: carbonization treatment is performed after an organic polymer layer is coated on the surface of aluminum-silicon alloy powder, aluminum is removed by performing acid etching on a carbonization product, pore forming is performed on a carbon layer, and thus the nano silicon/porous carbon composite anode material is obtained. The preparation method is simple and low in cost, the mass production requirement is met, and the prepared composite anode material can be used for preparing the lithium ion battery and shows high capacity and excellent cycle and rate performance.

The invention relates to a negative electrode material with a multi-coating structure as well as a preparation method and application of the negative electrode material. The negative electrode material with the multiple coating structures comprises lithium-containing silicon monoxide as well as a lithium salt coating layer, a carbon coating layer and a polymer coating layer which sequentially coatthe surface of the silicon monoxide. The lithium salt coating layer of the negative electrode material effectively inhibits the volume expansion of the material, improves the ionic conductivity of the surface of the material, improves the cycling stability of an electrode, and reduces the alkalinity of the material; the carbon coating layer of the negative electrode material improves the electronic conductivity of the surface of the material and improves the oxidation-reduction reaction rate of the surface of the material; the polymer coating layer of the negative electrode material improvesthe compatibility between the silicon monoxide and the organic electrolyte, limits the volume expansion of the material to a certain extent, avoids the cracking of the material, and more effectively improves the cycling stability of the electrode.

The invention discloses a preparation method of block NiS2 and an application of the block NiS2 to a sodium-ion battery. According to the method, a 2-methylimidazole alcohol solution is added to a nickel salt alcohol solution, the mixture is evenly mixed, left to stand, subjected to centrifugal separation and dried, and nickel precursors are obtained; the nickel precursors and sulfur powder are ground and mixed, the mixture is placed in a vacuum environment for heat treatment, and a block NiS2 material comprising high-purity NiS2 nano spherical small particles is obtained. The material is used as an anode material to be applied to the sodium-ion battery and shows excellent electrochemical properties such as the high specific capacity, the long cycle life and the like; the preparation method of the block NiS2 material is simple, the cost is low, and industrial production requirements are met.

The invention belongs to the technical field of proton exchange membrane fuel cell flow channel design, and relates to a fuel cell bipolar plate with a controllable pressure difference between flow channels. The fuel cell bipolar plate includes a square gas flow field and a plurality of parallel square ribs arranged in parallel in the gas flow field. Holes for fixing the bipolar plate are locatedat the corners of the flow field. The gas inlet of an internal flow channel is disposed on a side of the bipolar plate. The gas outlet of the internal flow channel is disposed on the opposite side ofthe gas inlet of the internal flow channel. The gas inlet of an outer flow channel is disposed on the adjacent side of the gas inlet of the inner flow channel. The gas outlet of the outer flow channeldisposed on the opposite side of the gas inlet of the outer flow channel. The fuel cell bipolar plate promotes the drainage of a proton exchange membrane fuel cell electrode through a dual-channel combination in coopeation with different air pressures to improve a material transfer rate. The squeezing effect of different air pressures promotes the discharge of liquid water under the ribs of the membrane electrode to the flow channels and out of the cell with a gas to reduce water flooding, so that the membrane electrode has good conductivity and porosity.

The invention provides a refrigerator, which comprises an inner container, and a storage compartment is formed inside; a storage container arranged in the storage compartment; a first oxygen removal assembly arranged on the storage container and provided with a first oxygen consumption part which faces the interior of the storage container and is used for consuming oxygen in the storage container through an electrochemical reaction, and a first electrolysis part which faces the exterior of the storage container and is used for electrolyzing water vapor outside the storage container; and a water supplementing device arranged close to the storage container and used for providing the water vapor required by the electrochemical reaction for the first electrolysis part. The water supplementing device is arranged on the rear side of the first oxygen removal assembly, so that the water supplementing device provides the water vapor required by the electrochemical reaction for the first electrolysis part, the electrochemical reaction rate of the first oxygen removal assembly can be increased, and the oxygen removal rate is increased; and the water supplementing device is arranged in the storage compartment, the structure is simple, and operation is easy.

The invention discloses a fuel cell electrode in-situ preparation method based on a microporous layer with a double-layer ordered structure, and relates to the field of fuel cells, and the method comprises the following steps: treatment of an electrode substrate layer, preparation of a hydrophobic layer, preparation of an ordered hydrophilic layer and in-situ growth of a platinum-based catalyst onthe hydrophilic layer. In the fuel cell electrode prepared by the method, the Pt-based catalyst directly grows on the ordered microporous layer in situ, so that the Pt-based catalyst shows differentforms such as nanowires and nano dendrites, the electrochemical active surface area and the catalyst stability are increased, the transmission resistance between the microporous layer and the catalystlayer is reduced, and the performance of the cell can be effectively improved. Under a low-temperature fuel cell operation condition, the electrode shows more excellent cell performance than a traditional electrode.

The invention discloses a CoO/rGO composite and a preparation method and application thereof, the CoO/rGO composite is formed by randomly distributing CoO nanorods in the shape of sugar coated haws ona stick on the surface of graphene, the CoO nanorods are composed of CoO nanoparticles, and a gap is arranged between adjacent CoO nanoparticles. The CoO/rGO composite is a double-effect catalyst fora lithium air battery. The CoO/rGO composite has good catalytic activity for both ORR and OER, and has very high battery capacity. The CoO/rGO composite has simple process, environmental friendliness, low cost and high efficiency and other characteristics.

The invention provides a clustered polyaniline nanofiber composite carbon electrode and preparation method and application thereof. The preparation method comprises the following steps of firstly, dissolving tartaric acid in water to obtain a tartaric acid aqueous solution, adding aniline to the tartaric acid aqueous solution to obtain a mixed liquid A, and performing ice-bath cooling; secondly, dropwise adding an ammonium persulfate aqueous solution into the mixed liquid A to obtain a mixed liquid B, and performing ice-bath heat preservation; thirdly, placing a carbon fabric in the mixed liquid B, and allowing ice-bath standing; and finally, taking out the carbon fabric, washing the carbon fabric with deionized water and an organic solvent to obtain the clustered polyaniline nanofiber composite carbon electrode. In the polyaniline product prepared according to the method, a regular clustered nanometer structure is formed on a surface of the carbon fabric in an in-situ way, and the material has better biological compatibility and larger specific area; the size and the shape of the electrode can be adjusted, and the electrode is applicable to different demands of a laboratory, a factory, a precise instrument and the like; and with a microstructure electrode formed from the electrode, the electrode has higher roughness and more excellent absorption performance, and the electrochemical reaction ratio is greatly improved.

The invention discloses a nano-scale cube CoSnO<3> and graphene composite material. The composite material is characterized in that nano-scale cube CoSnO<3> and gauzy graphene form a coating structure. The nano-scale cube CoSnO<3> and graphene composite material is prepared by a simple and easy method, wherein the nano-scale cube CoSnO<3> is uniformly coated with graphene, and by virtue of graphene coating, the conductivity of the CoSnO<3> material is greatly improved; meanwhile, volume expansion of the CoSnO<3> material is also relieved, and pulverization and falling off of the electrode material are also suppressed effectively; and therefore, when the nano-scale cube CoSnO<3> and graphene composite material prepared in the invention is used as the negative electrode material of a sodiumion battery, excellent discharge specific capacity and stable cycle performance are represented.

The invention discloses a silicon anode of a lithium ion battery. The silicon anode is formed by bonding a conductive agent and an anode material, the anode material comprises anode active matter and a binding material, the anode active matter comprises graphite and silicon dioxide, and the binding material is an organic solvent type binding agent. A conductive agent is of a silicon nanotube ball structure and comprises a plurality of evenly distributed silicon nanotubes, and the anode material is attached to the surfaces of the silicon nanotubes. A carbon material has high electronic conductivity and ionic conductivity, the rate capacity of the silicon material can be improved, and the volume effect of silicone in the circulating process can be inhibited. The silicon anode has high battery capacity and circulating stability.

The invention relates to an integrated preparation process for a long-life hydrogen storage alloy film/nickel foil combined electrode material. The process is characterized by comprising steps that a,rare earth elements and other metal elements are smelted under argon protection conditions to obtain cast ingot, and the cast ingot is then made into alloy powder under the protection of argon; b, the alloy powder is pressed into an alloy target for sputtering; c, a nickel foil substrate for sputtering is cut and cleaned; d, the working pressure, the sputtering power, the sputtering time and thesubstrate temperature for sputtering are set, and the hydrogen storage alloy film is prepared. Through the prepared combined electrode material, the diffusion distance of electrons/ions is effectivelyreduced, the specific surface area of the alloy is increased, the contact resistance between an active material and a current collector is reduced, integrated preparation of the long-life hydrogen storage alloy film/nickel foil composite electrode material is realized, and a new method and idea is provided for reducing the internal resistance of a nickel-hydrogen battery and increasing the electrochemical reaction rate.