34results about How to "Improve electrochemical kinetic performance" patented technology

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.

The invention discloses a polypyrrole-coated sulfur-doped cobalt-based carbon nanocage material, a preparation method and an application thereof, belonging to the technical field of lithium-sulfur batteries, and specifically includes the following steps: preparation of a precursor cobalt-based ZIF‑67, sulfur doping Preparation of heterocobalt-based carbon nanocages, polypyrrole-coated sulfur-doped cobalt-based carbon nanocages (PS‑CNCs). By constructing a carbon nanocage to form an internal hollow structure, it can accommodate more active material sulfur, and limit the volume expansion of sulfur, effectively alleviate the volume expansion problem during the battery reaction process, and increase the service life; sulfur-cobalt co-doping can effectively improve PS‑ The interaction between CNCs and polar polysulfides in the reaction can effectively inhibit the shuttle effect of polysulfides and improve the battery cycle performance; the use of polypyrrole-coated carbon nanocages can significantly improve the conductivity of the material, reduce impedance, and inhibit polarity. to improve battery stability. The method of the invention has low cost, simple operation, obvious effect and is suitable for popularization.

The invention discloses a three-dimensional porous nanocarbon composite lithium manganate spherical positive electrode material and a preparation method thereof. The preparation method comprises the following steps of adsorbing Mn<2+> ions onto a carbonyl (-COH-) group in a microgel three-dimensional macromolecular network by adopting poly(acrylamide, acrylic acid) microgel spheres as a template; increasing the pH value of the poly(acrylamide, acrylic acid) microgel spheres so as to in-situ hydrolyze the Mn<2+> ions to generate Mn(OH)2 crystal nucleus, depositing the Mn(OH)2 crystal nucleus into a space formed by the three-dimensional macromolecular network to form nano composite polymer microspheres; placing the obtained nano composite polymer microspheres into a tubular furnace to be calcined at a high temperature in an inert gas atmosphere to prepare the three-dimensional porous nanocarbon composite lithium manganate spherical positive electrode material. The positive electrode material has the advantages of excellent high-temperature cycling performance, large multiplying power charging-discharging performance and the like, and can be widely applied to the production of a lithium battery.

The invention discloses a method for improving the electrochemical and dynamic properties of an La-Mg-Ni-based alloy electrode. The method comprises the steps of: smelting raw materials of La, Mg, Ni and Co into a cast alloy; crushing the cast alloy; and adding graphene and a graphene / nickel compound for mixing and ball-milling to prepare an La-Mg-Ni / graphene and La-Mg-Ni / graphene compound Ni-MH battery material. The method has the advantages that the electrochemical and dynamic properties of the material are obviously improved after the graphene and the graphene / nickel compound are added to La-Mg-Ni alloy powder for mixing and ball-milling; and a solid foundation is laid for later research of the Ni-MH battery material.

The invention relates to the technical field of lithium-sulfur batteries, and aims to provide a method for preparing membrane electrodes of lithium-sulfur batteries. The preparation method of the membrane electrode of the lithium-sulfur battery comprises the steps of: preparing a carbon material with nanometer ferrous sulfide dispersed on the surface of the carbon carrier, and then using the carbon material to prepare a positive electrode material; then preparing the positive electrode and the negative electrode, and the lithium ion exchange membrane respectively, Finally, the positive electrode, negative electrode and lithium ion exchange membrane are pressed into a lithium-sulfur battery membrane electrode. The lithium-sulfur battery membrane electrode prepared by the invention has: good electrical conductivity, very low internal resistance; good electrode reaction reversibility; good chemical stability and thermal stability; cheap and easy to prepare; pollution-free; battery manufacturing The process is simple, conducive to large-scale production, and can effectively reduce production costs.

The invention discloses a sodium ion battery positive electrode material. The sodium ion battery positive electrode material consists of a vanadium bronze wire ball; the vanadium bronze wire ball adopts a hierarchical porous spheroid structure, has the diameter of 1 to 5 um and is formed by interweaving nanotubes; due to the unique hierarchical porous structure, the sodium ion diffusion coefficient of the vanadium bronze material is increased and the rate performance of the vanadium bronze material is greatly improved; furthermore, expansion and shrinkage of the material volume can be retardedand the integrity of the electrode is maintained; and the stability of the battery capacity is guaranteed, so that the cycle performance is improved. Meanwhile, the preparation method provided by theinvention is simple and efficient; a vanadium oxide precursor is prepared by an organic template method, and the spheroid vanadium bronze wire ball with the hierarchical porous structure can be obtained through hydrothermal reaction and calcination reaction; and the integral preparation method is high in repeatability and has actual application value.

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 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 relates to the field of a lithium sulfur battery, and aims at providing a lithium sulfur battery adopting stannous sulfide as an anchoring center and a preparation method of a positive electrode of the lithium sulfur battery. The preparation method of the lithium sulfur battery adopting the stannous sulfide as the anchoring center specifically comprises the following steps: preparing a macroporous carbon material with nano stannous sulfide being dispersed on the inner wall and a macroporous carbon material with supported sulfur, preparing an anode material of the lithium sulfur battery by utilizing the macroporous carbon material with supported sulfur, preparing the positive electrode by utilizing the positive electrode material, and assembling the positive electrode, a diaphragm, a negative electrode and electrolyte to form the lithium sulfur battery. The prepared high-capacity lithium ion battery positive electrode material is good in conductivity, low in internal resistance, good in electrode reaction reversibility, good in chemical stability and thermal stability, low in price, easy to prepare and pollution-free, so that the electrochemical dynamics performance of the lithium sulfur battery positive electrode can be improved, the electrode polarization can be alleviated, and the speed capacity of the lithium battery can be improved.

The invention relates to the technology of batteries, and aims at providing a preparation method of indole-modified carbon sulfur-coated and compound lithium sulfur battery anode material. The method comprises the following steps: reacting carbon source material, deionized water and spherical aluminum powder at the temperature of 250 DEG C, and performing centrifugal separation to obtain a brown or black solid powder sample; washing, performing centrifugal separation, drying, and then carbonizing at a constant temperature in nitrogen; performing acid treatment or alkaline treatment after cooling; washing and performing vacuum drying after filtering so as to obtain hollow carbon spheres; reacting the hollow carbon spheres, indole and transition metals at the temperature of 100-300 DEG C, performing vacuum drying after filtering and washing so as to obtain hollow carbon spheres modified by indole and transition metals; grinding and mixing with elemental sulfur, placing in a reactor, vacuumizing and heating to complete sulfur storage process through reactions, and cooling to room temperature. Organic electrolytes are safe in the application of battery; the anode material has good electrode reaction reversibility and good chemical stability and heat stability, and is low in cost, easy to prepare and free from pollution.

The invention relates to preparation and application of an anode material of a lithium battery and aims to provide preparation and the application of a conductive carbon film-coated calcium nitride compound serving as the anode material of the lithium battery. The preparation method comprises the following steps of: after calcium metal is molten, spraying into polyethylene glycol liquid by using high purity nitrogen, and performing a reaction of the calcium fog drops and nitrogen in an nitriding atmosphere to obtain Ca3N2 microspheres so as to obtain a carbon-coated calcium nitride material primary product; and after filtering out a carbon-coated calcium nitride material, calcining for 2 to 3 hours again in the high purity nitrogen atmosphere and carrying out refining to obtain carbon-coated Ca3N2, or calcining for 2 to 3 hours again in vacuum to obtain a carbon-coated Ca3N2-Ca2N mixture. In the invention, a conductive carbon film is formed on the surface of Ca3N2 or Ca3N2-Ca2N, is favorable for stability of an electrode structure, has high heat stability and low cost, is easy to prepare and has no pollution. The conductive carbon film prepared by a spraying method has the advantages of uniform thickness and high conductivity. The electrode polarization is reduced. The speed and the capacity of the lithium battery are improved.

The invention discloses a vanadium-based hydrogen storage alloy, which belongs to the technical field of nickel-hydrogen battery development. The chemical formula of this alloy is V 2 TiNi 0.5 Cr 0.5 m x , wherein 0<x≤0.2, M is at least one of La, Ce, Y, Sc, Nd, Gd, Er and Yb. The present invention considers the advantages and disadvantages of rare-earth hydrogen storage alloys and vanadium-based hydrogen storage alloys, adopts V, Ti, Cr, and Ni as matrix alloys, and La, Ce, Y, Sc, Nd, Gd, Er, and Yb in rare earths are After introducing rare earth elements into modified metals and vanadium-based hydrogen storage alloys, on the one hand, the discharge capacity of the hydrogen storage alloy as the negative electrode material of the nickel-hydrogen battery can be improved, and on the other hand, the electrochemical kinetic performance of the alloy electrode can be improved. The technical problems of low actual discharge capacity and insufficient kinetic performance of the existing nickel-hydrogen battery are solved.

The invention relates to a battery preparation technology, and aims to provide a method for manufacturing a lithium-sulfur battery. The method comprises the following steps of: grinding a carbon-coated aluminum composite material, acetylene black and polyvinylidene fluoride (PVDF), adding N-methyl pyrrolidone, and regulating to be sticky; mechanically mixing into paste, coating the paste on a penetration hole copper film, and drying in the shade; performing compression molding to obtain a negative electrode of the lithium-sulfur battery; grinding a carbon-coated sulfur composite material, the acetylene black and the PVDF, adding the N-methyl pyrrolidone to form the paste, coating the paste on an aluminum film, and drying in the shade; performing compression molding to obtain a positive electrode of the lithium-sulfur battery; forming a sandwich structure through electrode materials facing the side of the positive electrode and the negative electrode and a partition film which adopts a micro-pore polypropylene film, wherein a lithium film is arranged on one side, abutting against the partition film, of a copper film of the negative electrode,; and dissolving an electrolyte LiClO4 into a mixed solvent of dioxolame and ethylene glycol monomethyl ether. According to the method, a steady charge-discharge voltage platform is adopted; the lithium-sulfur battery is high in electrode reaction reversibility, high in chemical stability and thermal stability, low in cost, easy to prepare, pollution-free, and anti-oxidant; and the safety is improved.