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 discloses a high-capacity square lithium ion power battery comprising a square shell and a plurality of square battery cells, wherein each square battery cell is formed by winding a positive plate, a diaphragm and a negative plate into a square; and a positive current collector in the positive plate extends out of the square battery cell formed by winding and is cut and welded to form a positive current collector connecting end, a negative current collector in the negative plate extends out of the square battery cell formed by winding and is cut and welded to form a negative current collector connecting end, the positive current collector connecting ends of the plurality of square battery cells are connected with a positive terminal through positive convergence plates, and the negative current collector connecting ends of the plurality of square battery cells are connected with a negative terminal through negative convergence plates, so that the high-rate charging / discharging performance and circle performance of the square lithium ion power battery are improved. The invention also discloses a preparation method of a square lithium ion power battery; by using the preparation method, the production process is simplified, and the industrial and high-efficiency production is easily realized; and the prepared square lithium ion power battery has more excellent performance.

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 discloses a cylindrical power lithium-ion battery which comprises a cylindrical housing and a cylindrical cell, wherein the cylindrical housing is provided with a positive pole and a negative pole; the cylindrical cell is formed by coiling a positive plate, a separating film and a negative plate into a cylinder shape; a current collector of the positive electrode extends from one axial end of the coiled cylindrical cell and is divided and welded to form a current collector connecting end of the positive electrode, and a current collector of the negative electrode extends from the other axial end of the coiled cylindrical cell and is divided and welded to form a current collector connecting end of the negative electrode; the current collector connecting end of the positive electrode is connected with the positive pole, and while the current collector connecting end of the negative electrode is connected with the negative pole; and the high-rate charging and discharging performance and the cycling performance of the cylindrical power lithium-ion battery can be improved by improving the structure of the cylindrical cell. The invention also discloses a preparation method of the cylindrical power lithium-ion battery. With adoption of the preparation method, the production technology is simplified, the technology is easy for efficient industrial production, and the prepared cylindrical power lithium-ion battery has relatively excellent performance.

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.

The present application relates to a water-based adhesive, which is characterized in that it is an emulsion containing latex particles with a core-shell structure, wherein the core of the latex particles with a core-shell structure contains a fluorine-containing polymer A and a fluorine-free lipophilic polar polymer B; The shell of the core-shell latex particle contains a hydrophilic polymer M; the solid content of the core-shell latex particle in the emulsion is 5-50 wt%. The electrode sheet prepared by using the water-based adhesive is used in lithium-ion batteries. The lithium-ion battery has a high capacity, good adhesion between the electrode sheet and the diaphragm interface, and a long battery cycle life; the separator pretreated with the water-based adhesive Membrane, high ionic conductivity, strong adhesion with the pole piece.