52 results about "Electrochemical kinetics" patented technology

The invention provides a laminated lithium metal battery negative electrode material, a preparation method thereof and a lithium metal secondary battery. The preparation method is characterized in that: a lithium-philic metal layer capable of being alloyed with lithium is prepared on the surface of a metal lithium negative electrode or a lithium-free negative electrode current collector, and an artificial lithium ion diffusion layer is prepared on the surface of the lithium-philic metal layer, wherein the lithium-philic metal layer has the functions of reducing nucleation and diffusion barriers of lithium and accelerating electrochemical kinetics of an electrode interface; and the artificial lithium ion diffusion layer has the functions of stabilizing the metal lithium surface and adjusting lithium ion diffusion. A multi-stage functional modification layer of the laminated lithium metal battery negative electrode can inhibit the generation of lithium dendrites, and the cycling stability of the metal lithium negative electrode is improved.

The invention relates to a preparation method of a lithium ion battery anode material, aiming to provide a method for preparing a conducting film LiFePO4 cladding material containing nitrogen. The method comprises the following steps of: ball milling and mixing FePO4.4H2O, LiOH.H2O and a polyacrylonitrile emulsion, blending into a paste and putting the paste into a quartz reactor; regulating and controlling the microwave output power and controlling the reaction temperature to be at 150 DEG C; raising the microwave output power in an oxygen atmosphere and heating up to 300 DEG C from 150 DEG C; switching to a highly pure nitrogen atmosphere, raising the microwave output power and heating up to 600 DEG C from 300 DEG C; and continuously raising the microwave output power under the highly pure nitrogen atmosphere and annealing at 700-800 DEG C for denitrifying. Nitrogen atoms remain on the conducting carbon film formed by the invention, and lone pair electrons of the nitrogen atoms can effectively improve the conductivity of the carbon film so as to improve electrochemical and dynamic properties of the anode, reduce the electrode polarization and improve the velocity volume of the lithium cell, thus the invention can be applied to power cells of electric vehicles.

The invention discloses a test device and a method for evaluating scouring corrosion of an oil-gas pipeline under a high flow rate. The test device comprises a thin liquid layer scouring channel and a fluid storage tank, wherein a fluid inlet and a fluid outlet of the thin liquid layer scouring channel are communicated with an outlet and an inlet of the fluid storage tank respectively to form fluid circulation; a plurality of sample mounting openings are formed in the thin liquid layer scouring channel; an electrochemical sample mounting opening and a shearing force mounting opening are electrically connected with an electrochemical workstation and a shearing force sensor respectively; signal output ends of the electrochemical workstation and the shearing force sensor interact with a computer. Through the test device and the method for evaluating scouring corrosion of the oil-gas pipeline under the high flow rate, the corrosion test and the characterization technique under scouring under the high flow rate in the thin liquid layer are achieved; through an electrochemical test system, the electrochemical kinetic test and the thermodynamic test under the high-flow-rate scouring state are achieved; through change of the surface state of the sample and the geometrical shape of the surface of the sample, the scouring behavior of the inner surfaces of pipelines in the actual working conditions can be simulated.

The invention relates to a preparation method of a porous nickle current collector of a lithium ion battery and relates to the field of materials of lithium ion batteries. The preparation method comprises the following steps: granulating to obtain mixed powder by adopting nickle oxide and graphite as initial materials; pressing into a green blank body and calcining to obtain a blank body; reducing the blank body to obtain a porous nickle current collector of the lithium ion battery; mixing and grinding a transition-metal-oxide negative material with a nano structure, a bonding agent and a pore forming agent, then uniformly coating the surface of the porous nickle current collector of the lithium ion battery with the mixture I, and sintering to obtain an electrode of the lithium ion battery; uniformly mixing a lithium source, an iron source, phosphate radical solution and an organic complexing agent, coating the surface of the porous nickle current collector of the lithium ion battery with the mixture II; and ageing and calcining to obtain a thin-film electrode made of lithium iron phosphate. The porous nickle current collector of the lithium ion battery has the advantages that due to good communicating characteristics, electrons can be relatively well transferred; due to a relatively high three-phase interface, electrolyte and a negative electrode can be relatively well infiltrated mutually; the thin-film electrode made of the lithium iron phosphate has the communicated three-phase interface, so that the convenience is brought for improving the electro-chemical dynamic characteristics of the material.

The invention belongs to the technical field of capacitors, and in particular relates to a preparation method of a self-healing flexible solid supercapacitor. The preparation method of the self-healing flexible solid-state supercapacitor comprises the following steps: (1) preparation of polydopamine-polyacrylamide-sulfuric acid hydrogel; (2) preparation of polyaniline flexible supercapacitor. This method synthesizes hydrogel capacitors in one step, greatly reducing the large interfacial resistance exhibited by electrode materials and electrolytes due to poor contact, and the contact between electrolytes and conducting polymers by providing excellent electrochemical kinetic properties and significant The structural stability improves the performance of supercapacitors.