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

The invention discloses a conductive carbon substrate loaded graphene aerogel composite electrode and a preparation method thereof. One part of graphene aerogel of the composite electrode permeates into pores of a conductive carbon substrate, and the rest part of graphene aerogel is loaded on the surface of the conductive carbon substrate. The preparation method comprises the steps of 1, adding transition metal salt or active substance powder into a graphene oxide dispersion liquid; 2, dropwise adding a mixed solution A prepared in the step 1 onto a conductive carbon substrate, and carrying out freeze drying; and 3, putting the precursor aerogel loaded on the conductive carbon substrate into a heating furnace, and carrying out heat treatment under protective gas. The graphene aerogel composite electrode has the technical effects that grinding of the graphene aerogel is avoided, a conductive agent and a binder are not used, meshes of a graphene aerogel conductive network are not blocked, the electrical performance of the composite electrode is improved, and the composite electrode is compact in structure and does not fall off.

The invention relates to a method for processing silica powder suitable for an electrode material of a lithium ion battery. The method particularly comprises the following steps of: preparing a microemulsion system; sanding a microemulsion liquid phase; filtering and washing materials; atomizing and drying the washed materials for forming; and carrying out high-temperature heat treatment. According to the method, the microemulsion liquid phase is adopted as a grinding medium, and the high-purity silica powder is dispersed in microemulsion liquid drops in the sanding process, so that oxidization and monomer agglomeration can be avoided; spherical solid-phase silica powder particles are obtained by the atomizing and drying process; and finally, a product is further purified through the high-temperature heat treatment in a mixed atmosphere to obtain the superfine silica powder with good dispersity. The superfine silica powder provided by the method is good in dispersity and is 50-500 nm, optimally 50-200 nm, in particle size.

The invention discloses an aluminum secondary battery and an aluminum storage active material thereof. According to the invention, three-dimensional self-assembled nano vanadium tetrasulfide (VS4) is synthesized by adopting an organic solvent assisted solvothermal reaction process and combining specific conditions, and is used as a positive electrode active material of an aluminum secondary battery. The three-dimensional self-assembled nanostructure is very suitable for being used as an aluminum storage material, has the characteristics of chain crystal structure with chain spacing, weak interaction between adjacent chains, high sulfur content and the like, not only can provide more potential sites for intercalation and deintercalation of ions, but also can improve charge transfer, and therefore, the cycle performance of the aluminum secondary battery can be stably improved.

The invention discloses a lithium-sulfur secondary battery as well as a preparation method and application thereof. The lithium-sulfur secondary battery is prepared from a bentonite / sulfur composite positive electrode material with an efficient ion channel and a conductive network structure, a conductive agent and a binder. The bentonite / sulfur composite positive electrode material with the efficient ion channel and the conductive network structure remarkably improves the sulfur loading capacity of the positive electrode of the lithium-sulfur secondary battery, promotes the transmission of ions / electrons in the positive electrode of the battery, and strengthens the electrochemical reaction kinetics in the positive electrode; therefore, the specific discharge capacity, the cycling stabilityand the rate capability of the lithium-sulfur secondary battery are effectively improved, and the lithium-sulfur secondary battery can be widely applied to various energy storage power supply systemsand has extremely high practical value.

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 provides a flame-retardant electrolyte, and the electrolyte comprises a lithium salt and an organic liquid; the organic liquid comprises a first component and a second component; the first component is an ester or ether organic solvent, and the second component is a phosphazene flame retardant, wherein the lithium salt is dissolved in the first component and is not dissolved in the second component. The first component accounts for 5-90% of the mass of the organic liquid, and the second component accounts for 10-95% of the mass of the organic liquid. According to the flame-retardant electrolyte provided by the invention, the solvation structure of lithium ions can be regulated and controlled, a compact and uniform solid electrolyte interface layer is formed on the surface of an electrode, and uniform nucleation and stable deposition of lithium metal are realized. The flame-retardant electrolyte can inhibit the growth of lithium dendrites and the formation of dead lithium, and improves the coulombic efficiency and cycle stability of the lithium metal battery. Meanwhile, the electrolyte has good incombustibility, and the safety performance of the lithium metal negative electrode can be greatly improved. The invention also provides a preparation method of the flame-retardant electrolyte and a lithium metal battery.

The invention discloses a carbon nanotube-in-tube@manganous-manganic oxide nanoparticle composite material, a preparation method thereof and an application of the composite material in preparation of an aqueous zinc ion battery positive electrode. In the composite material, the carbon nanotube-in-tube is of a tube-in-tube structure which takes a carbon nanotube as an inner tube and an amorphous carbon nanotube as an outer tube and is formed by sleeving the inner tube with the outer tube; and manganous-manganic oxide nanoparticles are tightly coupled to the inner surfaces and the outer surfaces of the inner carbon nanotube and the outer carbon nanotube. The preparation method comprises the following steps: firstly synthesizing ZIF-8 nanoparticle strings CNTs, then carrying out tannic acid treatment and carbonization treatment to generate the carbon nanotube-in-tube, then reacting with potassium permanganate to grow MnO2 nanosheets on the inner and outer surfaces of the carbon nanotube-in-tube, and finally calcining to obtain the final product. According to the invention, the conductivity and the structural stability of Mn3O4 can be improved, so that the reversible capacity and the cycle performance of Mn3O4 are improved.

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 provides an electrode material for a room-temperature solid-state lithium-sulfur battery, which is formed by compounding transition metal sulfide and sulfur. The electrode material provided by the present invention can satisfy the use of room temperature solid-state lithium-sulfur batteries, and can improve the electrochemical performance of room-temperature solid-state lithium-sulfur batteries. To solve the problem of poor performance, improve the electrochemical reaction kinetics, so that the solid-state lithium-sulfur battery can work normally at room temperature. On the other hand, transition metal sulfide electrode materials can be combined with elemental sulfur through material design, which can improve the structural stability of active materials and solve the large volume change of elemental sulfur during cycling, thereby effectively improving the cycle stability of solid-state lithium-sulfur batteries. . Therefore, the composite electrode material of transition metal sulfide and elemental sulfur provided by the present invention has higher discharge specific capacity and longer cycle life.

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 invention relates to an electrode material with a porous hollow nanotube structure and a preparation method thereof, a negative electrode and a lithium ion battery. The electrode material is assembled from a plurality of Co3O4 particles, the porosity of the electrode material ranges from 45% to 60%, and the BET specific surface area of the electrode material is 300-400m<2> / g. The electrode material with a porous hollow nanotube structure provided by the invention has a larger specific surface area and rich pore channel structures, so that the contact area of the material and electrolyte isincreased, a large number of electrochemical reaction active sites are provided, transfer of electrons and ions between a solid phase and a liquid phase is facilitated, electrochemical reaction is accelerated, and finally, the rate capability of the material is improved.

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.

The invention belongs to the technical field of electrode material preparation, and particularly relates to a reduced graphene oxide-based hollow Co-MOF composite flexible electrode material and a preparation method thereof. A graphene oxide-based Co-MOF composite material is obtained through freeze drying, then the graphene oxide-based Co-MOF composite material is rapidly reduced with a hot ammonium sulfide solution and etched to be hollow, and freeze-drying is performed again to obtain the reduced graphene oxide based hollow Co-MOF composite flexible material. The characteristics of high specific capacity of the Co-MOF derivative and excellent mechanical performance and high conductivity of the reduced graphene oxide are fully exerted, the prepared composite material can effectively buffer volume expansion in the circulation process, meanwhile, a hollow structure formed by Co-MOF further shortens an ion transmission path, electrochemical reaction kinetics is improved, and the material has obvious advantages.

The invention relates to a method for processing silica powder suitable for an electrode material of a lithium ion battery. The method particularly comprises the following steps of: preparing a microemulsion system; sanding a microemulsion liquid phase; filtering and washing materials; atomizing and drying the washed materials for forming; and carrying out high-temperature heat treatment. According to the method, the microemulsion liquid phase is adopted as a grinding medium, and the high-purity silica powder is dispersed in microemulsion liquid drops in the sanding process, so that oxidization and monomer agglomeration can be avoided; spherical solid-phase silica powder particles are obtained by the atomizing and drying process; and finally, a product is further purified through the high-temperature heat treatment in a mixed atmosphere to obtain the superfine silica powder with good dispersity. The superfine silica powder provided by the method is good in dispersity and is 50-500 nm, optimally 50-200 nm, in particle size.