35results about How to "Improve electrochemical reaction kinetics" patented technology

The invention belongs to the technical field of a lithium ion battery, and relates to a silicon carbon negative electrode material and a preparation method therefor, and the lithium ion battery. The preparation method for the silicon carbon negative electrode material comprises the following steps of (a), by taking silicon monoxide as the substrate material, performing heating treatment on siliconmonoxide to enable silicon monoxide to be subjected to a disproportionation reaction to generate c-SiO; (b), putting c-SiO into a chemical vapor deposition furnace, heating in protective atmosphere until a reaction temperature is reached, and pumping a carbon source to be subjected to a vapor deposition reaction to obtain c-SiO / C, wherein the carbon source is a liquid-state or solid-state compound; and (c), performing corrosion of the c-SiO / C by a corrosive liquid to obtain the silicon carbon negative electrode material c-SiO / Si / C. The preparation method is simple in process and easy to operate; and the prepared silicon carbon negative electrode material has the high lithium storage characteristic as the silicon type material and the high cycling stability as the carbon type material, aswell as high specific capacity, high conductivity and high cycling performance.

The invention belongs to the technical field of supercapacitor electrode material preparation, and discloses a photothermally enhanced supercapacitor electrode material and a preparation method. The copper foam is put into hydrochloric acid for ultrasonic treatment, and after taking it out, it is cleaned several times with deionized water, and then placed in acetone. Ultrasonic treatment in medium; ultrasonically treat the copper foam treated with acetone ultrasonic treatment with deionized water and alcohol respectively, take it out and dry it in vacuum to complete the pretreatment; put the pretreated copper foam into thiourea solution, carry out hydrothermal reaction, take out after cooling, wash and dry; soak the obtained product in ferric chloride solution, take it out, wash and dry, and then obtain the photothermally enhanced supercapacitor electrode material. The photothermally enhanced supercapacitor electrode material provided by the present invention has a three-dimensional multi-level nanosheet structure and has a large specific surface area, thereby exposing more chemical reaction active sites, achieving the effect of increasing the specific capacity, and has good flexibility and stability.

The invention belongs to the technical field of lithium secondary batteries, and discloses a preparation method of Se-doped vulcanized polyacrylonitrile material. The method is to mix polyacrylonitrile PAN with S element and Se element to form a mixture in a closed environment. Heat treatment, thereby preparing the Se-doped vulcanized polyacrylonitrile material in one step; wherein, the heat treatment temperature is 250-380° C., and the heat treatment time is 1-24 hours. The present invention improves the environment and atmosphere of the preparation method, reaction raw materials, reaction mechanism, etc., directly uses S, Se and PAN as raw materials, and synthesizes them by one-step heat treatment in a closed environment (such as closed air). Compared with the vulcanized polyacrylonitrile technology, it can effectively solve the problems of complex synthesis process, low sulfur utilization rate and low yield. The preparation method of the present invention is simple, high in yield and friendly to the environment.

The invention provides a copper-copper oxide integrated negative electrode for a lithium ion battery based on a hollow tubular three-dimensional nanoporous structure, which is composed of copper and a copper oxide film with a hollow tubular three-dimensional nanoporous structure, and the copper oxide film is CuO film or Cu 2 O film or CuO and Cu 2 A mixed film of O, and the copper and copper oxide films are integrated; the copper oxide film is a continuous integrated film formed in situ by partial oxidation of the three-dimensional nanoporous copper surface, and constitutes a core-shell structure three-dimensional nanoporous copper- Copper oxide precursor, and then partially selectively corrode the pore wall core of the above-mentioned three-dimensional nanoporous copper-copper oxide with a core-shell structure to form a copper-copper oxide integrated negative electrode of a lithium-ion battery with a hollow tubular three-dimensional nanoporous structure. The invention also provides a preparation method of the negative electrode. The method provided by the invention can simplify the production process of the negative electrode of the lithium ion battery and effectively improve the specific capacity and cycle performance of the negative electrode of the lithium ion battery.

The invention relates to a lithium metal battery with a curved lithium sheet negative electrode. A cavity, a second cavity is provided between the diaphragm and the other end of the battery case, an electrode sheet is provided in the first cavity, and the electrode sheet abuts against one end of the battery case, a battery negative electrode is provided in the second cavity, and the battery The two ends of the negative electrode are respectively in contact with the diaphragm and the other end of the battery case. The negative electrode of the battery is made of a curved lithium sheet. Both the first cavity and the second cavity are filled with electrolyte, and the electrode sheet and the negative electrode of the battery are respectively soaked in the electrolyte. . The curved lithium sheet extends the area of ​​the SEI film of the negative electrode of the battery, effectively reducing the growth of dendrites, and the SEI film is not easy to break. It can always maintain the electrolyte infiltration, enhance the electrochemical reaction kinetics, increase the migration path of lithium ions, help maintain the battery capacity and cycle efficiency of lithium metal batteries, and prolong the service life.

The invention relates to a diaphragm used for a lithium-sulfur battery. The diaphragm comprises a diaphragm basal body and a modification layer covering the diaphragm basal body, and the diaphragm ischaracterized in that the modification layer adopts a graphene and heterojunction nano composite, wherein a heterojunction nano material is of a two-phase composite structure, the interior is a high catalytic phase, an outer layer is a strong adsorbed phase, the high catalytic phase is at least on of cobalt sulfide, nickel sulfide and iron sulfide, and the adsorbed phase is at least one of cobaltoxide, nickel oxide and iron oxide. The invention also provides a preparation method of the diaphragm. The prepared diaphragm can be used for making a lithium-sulfur battery with excellent performance.