36results about How to "Lower transmission impedance" patented technology

The invention relates to the technical field of preparation of a surface micro-nano functional structure, in particular to a method for preparing a TiO2 multi-scale micro-nano composite structure on atitanium substrate. Firstly, a ultrafast laser is used for etching the surface of a pure Ti sheet in deionized water or absolute ethanol to prepare a first-level micro-structure, and ultrasonic cleaning is performed; then the surface of the laser-etched Ti sheet is subjected to gold film plating by magnetron sputtering; and finally, the Ti sheet after gold film plating is placed in a muffle furnace for heat treatment, a second-level nanostructure is prepared on the surface of the micro-structure to obtain the crystal type TiO2 multi-scale composite micro-nano structure.

The invention relates to the field of positive electrode materials, and provides a high-nickel positive electrode material, a preparation method thereof, and a lithium ion secondary battery. The high-nickel positive electrode material comprises secondary particles, wherein the secondary particles comprise a plurality of primary particles, the primary particles comprise an active substance, the general chemical formula of the active substance is LibNixCoyMzNwO2, 0.95 <=b <=1.05, 0.8 <=x < 1, 0<y+z<=0.2, x+y+z=1, 0.0001<=w<=0.003, M is selected from at least one of Mn and Al, and N is a metal; acoating layer which comprises a first coating layer and a second coating layer, wherein the first coating layer is formed on the surface of the primary particle, the second coating layer is formed onthe surface of the secondary particle, and each of the first coating layer and the second coating layer contains a phosphoric acid compound. According to the high-nickel positive electrode material,the preparation method thereof and the lithium ion secondary battery, the cost is low, large-scale production can be realized, and the rate capability and the cycling stability of the lithium batterycan be effectively improved.

The invention discloses a difunctional cobalt diselenide material as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) jointly performingthe hydrothermal reaction for a mixed aqueous solution of soluble cobalt salt, soluble ammonium salt and a carbon-containing precipitant and a conducting substrate, and obtaining a cobalt element-containing precursor growing on the conducting substrate; (2) jointly performing the hydrothermal selenylation reaction for a mixed solution of selenium powder, alkali, a reduction agent and organic solvent and the cobalt element-containing precursor in step (1), after the reaction is ended, drying, and obtaining the cobalt diselenide material. By combining the oxidation of hydrazine hydrate and the specific application of a hydrogen evolution catalyst, the preparation of the cobalt diselenide material is re-designed; and specifically by designing the overall process of the preparation method andselecting and optimizing parameter conditions adopted in each step and by optimally controlling the specific composition and microscopic morphology of the cobalt diselenide material, the cobalt diselenide bifunctional catalyst with greatly-improved catalytic activity can be correspondingly obtained.

The invention provides a solid-state battery, a battery module, a battery pack and related devices thereof. A sulfide electrolyte layer and at least one polymer electrolyte layer are arranged on the surface of the sulfide electrolyte layer, and the solid electrolyte meets the following conditions: the thickness of the sulfide electrolyte layer is greater than or equal to the thickness of the polymer electrolyte layer on one side and greater than or equal to 84.2-80.2*w. According to the polymer electrolyte layer with the proper thickness, the interface infiltration effect between the current sulfide electrolyte layer and the electrode can be improved; and the overall energy density of the battery cannot be seriously reduced, the application defects of sulfide electrolyte in the solid-statebattery are overcome to a great extent, and the cycle performance and the safety performance of the solid-state battery are improved.

The invention relates to preparation of a surface micro-nano functional structure and in particular relates to a method for preparing TiO2 nano-wires loaded with gold particles at top ends. The methodis characterized by comprising the following steps: firstly, putting Ti sheets into absolute ethyl alcohol and carrying out ultrasonic washing; then uniformly spraying gold on the surfaces of the washed Ti sheets through magnetron sputtering; then putting the Ti sheets sprayed with the gold into a muffle furnace and carrying out heat treatment; producing the crystallization type TiO2 nano-wires loaded with the gold particles at the top ends on the surfaces of the Ti sheets sprayed with the gold. The preparation method provided by the invention has the advantages of simple technology, controllable size, high light absorption rate, stable structure, capability of realizing large-scale production and the like; the prepared TiO2 nano-wires can be applied to fields including photocatalysis, surface-enhanced Raman scattering and surface-enhanced fluorescence, bacterium resistance and pollution prevention and, photoelectric conversion and the like.

The invention provides a major loop electric power cable for a medium-voltage frequency converter. The cable comprises three power conductors, three control conductors and a central gap filler, wherein the cross section of the central gap filler is round, a cabled core is formed by stranding of the three power conductors and the three control conductors around the central gap filler, the control conductors are arranged between any two adjacent power conductors, the cabled core is sequentially coated with a third metal shielding layer, an electrostatic shielding layer, a water-blocking tape covering layer, a tin-plated steel wire winding armor layer and a polyolefin outer sheath, and water-blocking ropes with triangular cross sections are placed in gaps between the power conductors, the control conductors and the third metal shielding layer. According to the major loop electric power cable for the medium-voltage frequency converter, effective capacitance is low, transfer impedance is low, good electromagnetic compatibility is achievable, the tensile strength and water resistance of the cable are improved, and the service life of the cable is prolonged.

The invention provides a preparation method of a metal lithium composite material. The method comprises the following steps: S1) heating and mixing a lithium-philic oxide and pure lithium, cooling, and rolling to obtain a metal lithium modified foil; soaking a three-dimensional conductive material in an organic solution containing metal salt to obtain a treated three-dimensional conductive material; and S2) mechanically compounding the metal lithium modified foil with the treated three-dimensional conductive material, and carrying out heat treatment in a protective atmosphere to obtain the metal lithium composite material. Compared with the prior art, the lithium-philic material capable of improving metal lithium negative electrode circulation is mixed into pure lithium in advance, the prepared metal lithium composite material can be directly used as a lithium battery negative electrode, the use efficiency of metal lithium is improved, structural support is provided, pulverization of metal lithium in a circulation process is prevented, and circulation performance of the battery is improved; and an interface lithium ion transmission impedance can be reduced, and battery polarizationis effectively decreased.

The invention relates to a high-power formable multi-layer composite bus bar for space navigation. The bus bar comprises a confluence positive bus 1, cavity insulation paste 2, a bus positive bus binding post 3, a cavity insulation assembly 4, a bus negative bus binding post 5, a confluence negative bus 6, an outer insulation protection cover 7, a bus negative bus installation groove 8, an insulation installation sleeve 9, a bus bar protection insulation plate 10 and a terminal insulation assembly 11. The confluence positive bus 1 is connected with a high-voltage end, and is on the intermediate position, the confluence negative bus 6 is connected with a low-voltage end (namely a direct-current zero-potential end), is U-shaped and surrounds three sides of the confluence positive bus 1, so that an electric field line generated after the high-voltage end and the low-voltage end are electrified is limited in the U shape, a good electromagnetic compatibility effect is ensured, and comparedwith the condition that a silver-plated copper wire is adopted in the same power cable assembly, about 20% of weight and volume can be saved under the condition of the same transmission horizontal sectional area. The heat dissipation area is large, the heat dissipation capacity is high, the environment temperature rise is low, and the transmission impedance can be reduced.

Provided is a power supply cable for low-voltage frequency conversion. The cable comprises a cable core, a lining layer, a shielding layer, a fireproof isolation layer, a wrapping layer and a sheath layer which are arranged in sequence, and the cable core comprises three first wire cores and three second wire cores. The three first wire cores are distributed in the cable core along the circumference; the three second wire cores are distributed on the periphery of the three first wire cores along the circumference, the diameter of each first wire core is larger than that of each second wire core, the fireproof isolation layer is arranged between the shielding layer and the sheath layer, the wrapping layer is arranged outside the fireproof isolation layer, and the fireproof isolation layer comprises a polygonal PE isolation sleeve and a fireproof mud layer which wrap the shielding layer. The power supply cable can bear pulse voltage during high-speed frequent frequency conversion, and plays a role in protecting a variable-frequency electric appliance; the fireproof mud layer is added on the basis of the fireproof cable, so that the bending radius of the cable is not increased when the cable encounters a fire, the operation and laying of the cable are more convenient, the operation time of the cable is longer when the fire occurs, the destructive power influenced by the fire is smaller, and the operation of the cable is more stable.

The invention discloses a solid-state electrolyte and a solid-state battery containing the same. According to the solid-state electrolyte and the solid-state battery containing the same, a novel polymer material (crown ether organic covalent skeleton structure material (COFs)) is synthesized as a modification layer to modify two sides of an inorganic solid-state electrolyte and/or an organic solid-state electrolyte in situ; and a final solid-state battery structure is a positive plate-polymer-inorganic solid electrolyte sandwich-like structure and/or an organic solid electrolyte-polymer-negative plate sandwich-like structure. The modification method provided by the invention can effectively improve the interface performance between a solid electrolyte and an electrode in situ, so that a prepared polymer solid electrolyte coating can significantly increase the transmission channel of lithium ions on a positive electrode/inorganic ceramic chip/negative electrode interface, and therefore, the transmission impedance of a solid-solid interface is reduced, the inorganic solid electrolyte and/or organic solid electrolyte are/is protected from being reduced by the metal lithium negative electrode, and the electrochemical performance of the solid-state battery is improved.