7results about How to "Facilitates electron conduction" patented technology

The invention discloses a preparation method and application of a bimetallic phosphate oxygen evolution electrode. The preparation method of the bimetallic phosphate oxygen evolution electrode comprises the following steps: cleaning a nickel substrate in an alkaline solution to remove oil, and cleaning the nickel substrate with pure water; soaking the cleaned nickel substrate in an acid solution, cleaning the nickel substrate with pure water, and placing the nickel substrate in the pure water for later use; the nickel substrate placed in the pure water serves as a cathode, two pure nickel materials are placed on the two sides of the nickel substrate to serve as two anodes, and electro-deposition is conducted on the nickel substrate in a bimetallic phosphate solution; and washing an electrode obtained after electrodeposition of the nickel substrate, and drying to obtain the bimetallic phosphate electrode. According to the preparation method, the adsorption free energy of a catalytic layer on the surface of the bimetallic phosphate oxygen evolution electrode on a reaction intermediate is optimized through the synergistic electronic effect of two metals, so that the intrinsic activity of oxygen evolution reaction is improved, meanwhile, a relatively stable catalytic layer structure is formed, and the stability of the bimetallic phosphate oxygen evolution electrode in the oxygen evolution process is improved.

This invention discloses a high-rate carbon-coated lithium iron phosphate cathode material and its preparation method, relating to the field of lithium-ion battery cathode material technology. The material constructs a unique bilayer composite carbon-coated structure on the surface of lithium iron phosphate particles, including an inner continuous dense conductive carbon layer and an outer three-dimensional porous carbon network layer. The inner carbon layer ensures rapid electron conduction, while the outer porous carbon layer maintains electron pathways, provides abundant ion diffusion channels, and buffers volume changes. The preparation method utilizes a stepwise liquid-phase coating and segmented heat treatment process. This invention effectively solves the problems of poor electronic conductivity and slow ion diffusion in lithium iron phosphate materials, significantly improving its high-rate charge-discharge performance and cycle stability. Furthermore, the process is controllable and suitable for large-scale production, showing broad application prospects in power batteries and high-power energy storage.

This invention discloses a method for preparing a three-phase composite material of perovskite, carbon, and alloy particles, and its application in water electrolysis. The method allows for the in-situ growth of 10-20 nm alloy particles on the surface of perovskite, and the coating of the perovskite and alloy particles with a carbon-nitrogen shell. The perovskite has a size of 100-200 nm, and the carbon-nitrogen shell has a thickness of approximately 10 nm, which is adjustable. In this invention, perovskite material is distributed in a dopamine salt solution. Under alkaline conditions, the dopamine salt polymerizes on the perovskite surface to form a polydopamine coating. After drying, it is calcined under an inert atmosphere to form a carbon-nitrogen shell structure. The metal sites in the perovskite and the alloy particles act as active sites, catalyzing the oxygen evolution reaction. The sufficiently small size of the surface-deposited alloy particles provides more active sites, promoting improved catalytic activity. The carbon-nitrogen shell increases the conductivity of the material, further enhancing its electrocatalytic activity.

The present application provides a complementary metal oxide semiconductor (CMOS) field effect device, comprising a substrate; a first n-type doped S / D region and a second n-type doped S / D region; a first p-type doped S / D region and a second p-type doped S / D region; a first channel layer disposed above the substrate, the first channel layer comprising a first sub-layer and a second sub-layer; wherein the first and second n-type doped S / D regions are disposed on a first side of the first channel layer, and the first and second p-type doped S / D regions are disposed on a second side of the first channel layer, the second side being opposite to the first side; wherein an energy of a conduction band edge of the first sub-layer is lower than an energy of a conduction band edge of the second sub-layer; and wherein an energy of a valence band edge of the first sub-layer is lower than an energy of a valence band edge of the second sub-layer; and a gate structure adjacent to the first sub-layer and the second sub-layer of the first channel layer.

The application discloses a silicon-carbon composite material and a preparation method and application thereof, and belongs to the field of electrochemical energy storage. The silicon-carbon composite material comprises a silicon-based active substance and a low-crystallization carbon matrix, the low-crystallization carbon matrix coats and / or disperses the silicon-based active substance; and the Raman spectrum ID / IG value of the low-crystallization carbon matrix is greater than 1.2. The low-crystallization carbon matrix has high disorder degree and toughness, can better adapt to the volume expansion and shrinkage of silicon in the charging and discharging process, maintains the integrity of the electrode structure, and thus significantly improves the cycle stability; the low-crystallization carbon surface contains more defects and functional groups, which is helpful to form a stable and dense SEI film, reduces the side reaction in the cycle process and the irreversible consumption of active lithium.

The invention discloses a preparation method of a sodium ion battery biomass-based hard carbon negative electrode material with high initial efficiency, which comprises the following steps: S1, biomass precursor preparation: crushing a biomass raw material to obtain a biomass precursor; s2, preparation of a hydrothermal precursor: soaking in an acid solution, and then washing, centrifuging and drying to obtain the hydrothermal precursor; s3, preparation of a carbonized precursor: soaking in a mixed solution of a reducing agent and a surfactant, transferring the mixed solution into a reaction kettle for heating reaction, cooling to room temperature, and centrifugally drying to obtain a pre-carbonized precursor; s4, pre-carbonization: carrying out pre-carbonization treatment, and then crushing and sieving to obtain a pre-carbonized material; s5, high-temperature coating: carrying out coating treatment to obtain a high-temperature carbonized precursor; and S6, high-temperature carbonization: carrying out high-temperature carbonization treatment to obtain the biomass-based hard carbon negative electrode material of the sodium-ion battery. The invention has the characteristics of high first coulombic efficiency and good cycling stability.

The embodiment of the invention discloses a positive pole piece and a preparation method thereof and a battery, the positive pole piece comprises a positive active material, a carbon nanotube conductive agent and a binding material, the oil absorption value D of the carbon nanotube conductive agent, the specific surface area S of the carbon nanotube conductive agent and the mass percentage w of the carbon nanotube conductive agent in the positive pole piece meet a relational expression R, the three key parameters, namely the oil absorption value, the specific surface area and the content of the carbon nanotube conductive agent, are synergistically regulated and controlled, so that an efficient three-dimensional conductive network is favorably constructed, and the pole piece can have excellent electron conduction and ion conduction at the same time, and has excellent power performance in a low-temperature environment.