30results about How to "Raise the voltage window" patented technology

The invention discloses a super-capacitor electrode based on vertical oriented graphene and a manufacturing method thereof. The electrode comprises a current collector and a graphene nanosheet, wherein the graphene nanosheet is vertical to the surface of the current collector; each graphene nanosheet comprises 1-10 layers of graphene. In the manufacturing process, the current collector is heated to 600-1000 DEG C; a carbon element contained gas is adopted as a precursor gas to generate a plasma; the current collector is placed in the plasma; a vertical oriented graphene nanosheet directly grows on the surface of the current collector by using a plasma reinforced chemical vapor deposition method, and after the vertical oriented graphene nanosheet grows for 5 minutes to 8 hours, the obtained current collector with the vertical oriented graphene nanosheet grown on the surface is the super-capacitor electrode. The super-capacitor electrode with the vertical oriented graphene as active material can be made in one step so that the use of adhesives and agglomeration of graphene are avoided, the benefit of material infiltration and ionic diffusion is achieved and the potential in effective energy storage area of the graphene and the property of the super-capacitor is improved.

The invention discloses an all-solid composite polymer electrolyte and a preparation method thereof, and a lithium ion battery. The method comprises the following steps of: S1, preparing a polymer matrix membrane by adopting a phase inversion method, wherein the polymer matrix membrane has a plurality of closely arranged vertical through holes; S2, gradually adding inorganic powder, lithium salt,a second polymer and an appropriate amount of auxiliary agent into a solvent for uniform stirring in an argon-filled glove box to obtain a polymer electrolyte, then, performing scrap coating of the polymer electrolyte in an environment controlled in moisture and oxygen to form a film, performing standing at room temperature to perform vacuum drying to obtain a polymer electrolyte film; and S3, putting the polymer electrolyte film prepared in the S2 at the upper portion of the polymer matrix membrane in the S1, performing melting and hot-pressing of the polymer electrolyte in a vacuum oven at atemperature of 100-350 DEG C into the vertical holes of the polymer matrix membrane. The all-solid composite polymer electrolyte is high in room-temperature conductivity and good in interface contact, has a high modulus and a high voltage window and is simple to prepare and low in cost.

The invention relates to a preparation method of a low-temperature solid electrolyte and application of the low-temperature solid electrolyte in a low-temperature solid supercapacitor. The preparation method comprises the steps that acetone is added into polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) and fully dissolved to obtain a transparent viscous solution A; an electrolyte salt is added into a solvent and uniformly mixed to obtain an electrolyte solution B; the solution A and the solution B are uniformly mixed to obtain a precursor solution C; and the precursor solution coats a clean and smooth substrate through blade coating or curtain coating and subjected to natural drying to obtain a low-temperature solid electrolyte membrane with a size of 20-100 microns. The prepared solid electrolyte has high conductivity at a low temperature; the preparation method is simple, easy to implement and wide in applicability; and when the low-temperature solid electrolyte is applied to the preparation of the low-temperature solid supercapacitor, the working temperature of the prepared solid supercapacitor is as low as -60 DEG C, the solid supercapacitor has excellent rate capability, low internal resistance, high energy density and long cycle life at low temperature, and the application range of the low-temperature solid supercapacitor in the fields of military industry or civil use and the like is widened.

The invention provides preparation methods of a porous carbon fiber / metal oxide composite material and a graphene-based conductive ink and an application of the graphene-based conductive ink in a supercapacitor. The preparation method of the composite material comprises the following steps: (1) carrying out high-temperature carbonization treatment on absorbent cotton at 900-1200 DEG C, cooling, and grinding to obtain porous carbon fibers; (2) placing the porous carbon fibers in a metal salt aqueous solution, stirring at a constant temperature, centrifuging, and drying to obtain a porous carbon fiber / metal salt composite material; and (3) roasting the composite material in a protective atmosphere, cooling, and grinding. According to the invention, the porous carbon fiber / metal oxide composite material which is uniform in compounding, high in metal oxide loading capacity, high in binding force and excellent in electrochemical energy storage performance can be prepared; and in order to realize printing of the composite electrode material, a small amount of graphene is added as a conductive channel between carbon fibers, and a water-based flexible supercapacitor based on the graphene-coated three-dimensional porous carbon fiber / metal oxide composite material is prepared by using a silk-screen printing method.

The invention relates to a preparation method of a sodium manganese oxide and an application of the sodium manganese oxide in a super capacitor. The preparation method comprises the steps of firstly, employing a coprecipitation method to mix a divalent manganese salt and a sodium hydroxide solution to form a Mn (OH) 2 suspension, and then carrying out washing-solid-liquid separation for several times to obtain Mn (OH) 2 precipitate powder; and grinding the precipitate and sodium hydroxide, sintering in an argon atmosphere at 300-900 DEG C to obtain a product, cooling to room temperature, taking out the product, washing with water for several times, and drying in a vacuum drying oven to obtain the manganese oxide doped with high sodium content. The prepared sodium manganese oxide is prepared into an electrode to form an asymmetric water system supercapacitor together with an activated carbon electrode, so that the electrochemical performance of the device is favorably improved. The sodium manganese oxide prepared by the method is low in cost, has the advantages of high specific capacitance, wide charge-discharge voltage window, long cycle service life and the like in an aqueous electrolyte, is simple in preparation process, and can realize macro-scale preparation.

The invention discloses an ionic liquid electrolyte and a lithium battery using the ionic liquid electrolyte, belonging to the related technical field of lithium batteries. The ionic liquid electrolyte includes an ionic liquid, and the ionic liquid is a pyrrolidine ionic liquid containing a long polyether chain segment , can effectively improve the conductivity of the ionic liquid electrolyte, and the preferred voltage window of the pyrrolidine-based ionic liquid electrolyte containing carbonate groups is significantly improved, and the battery using the ionic liquid electrolyte still has Higher capacity retention.

The invention discloses a preparation method of a water system high-voltage electrode material. The preparation method comprises the following steps: preparing carbon cloth / carbon nanometer wall withhigh conductivity and high specific surface as a base material; preparing Na0.5MnO2 nanosheet array through electrochemical deposition and electrochemical oxidation method; obtaining the carbon cloth / carbon nanometer wall / Na0.5MnO2 nanosheet positive material; preparing the carbon-clad porous VN nanosheet array through hydrothermal method and subsequent annealing; and obtaining the carbon cloth / carbon nanometer wall / carbon-clad porous VN nanosheet negative material. The above material is applied to preparing the asymmetric water system super capacitor. The working voltage of the asymmetric water system super capacitor prepared through the invention can achieve 2.6V, and the super capacitor has the energy density of 96.7 Whkg-1, excellent cyclic stability, and security, and an effective method is provided for designing and preparing the high-energy density super capacitor.

The invention provides a method for preparing a transition metal composite hetero atom doped porous carbon material through dipping, recrystallizing and carbonizing biomasses. The method comprises the following steps: immersing the biomasses in an aqueous solution of metal salt, and carrying out refrigeration vacuum drying on the immersed biomasses to recrystalize the metal salt in apertures of the biomasses in order to obtain a product A; and 2, placing the product A in a tubular furnace, and carrying out high temperature calcining to carbonize the biomasses at a high temperature and realize a metal salt decomposition reaction in order to obtain the transition metal composite hetero atom doped porous carbon material. The non-noble metal modified biomass carbon material is prepared from the biomasses through using the porous structure of the biomasses. Compared with routine high temperature carbonization, dipping recrystallization carbonization can synchronously realize activation and perforation, so the porous carbon prepared in the invention has a large specific surface area and good conductivity, thereby the porous carbon material still has strong energy storage and release ability under a high current density.

The invention discloses a quasi-solid state electrolyte of a sodium ion battery based on hydrated glass and a preparation method and application thereof. A quasi-solid state electrolyte for sodium ionbatteries based on hydrated glass is prepared by using Na2O-B2O3-SiO2-The hydrated glass of H2O system is used as matrix, sodium salt as admixture, Na2O: B2O3: SiO2: H2O=8-30: 0.5-3:20-70: 2-60, andthat admixture is 0. 5% by weight of the total mass of the admixture 0-10 wt%. 4qqq1) weighing that required matrix raw material, mixing with sodium salt admixture, uniformly stirring, standing, clarify and aging to form a colorless transparent liquid; 2) after 20-350 DEG C, 12-48 h heat treatment, the water content is adjusted and the elastic solid electrolyte is obtained. 3) Performing perfusion-heat seal of viscous liquid electrolyte and the elastic solid electrolyte is assembled by heat-sealing method, and the elastic solid electrolyte is assembled by solidification and hot-pressing method. The central working region with lower Tg and the edge region with higher Tg are formed by secondary heating. The invention has the advantages of good adaptability and stability, low cost, simple operation, easy control and realization of the process, and environment friendliness.

The invention provides a flame retardant organic electrolyte for a rechargeable zinc battery and a rechargeable zinc battery, the flame retardant organic electrolyte for a rechargeable zinc battery includes a soluble zinc salt, a sodium salt electrolyte salt and a flame retardant An organic solvent, the concentration of the soluble zinc salt is 0.1-2 mol / L, and the concentration of the sodium salt electrolyte salt is 0.1-2.5 mol / L. The flame retardant organic electrolyte solution of the present invention has suitable conductivity, viscosity, cation migration rate, high voltage window and excellent flame retardancy, can realize uniform deposition of metal zinc, and improve Zn deposition / precipitation coulombic efficiency and atom utilization rate , showing good electrochemical reversibility and compatibility with cathode and anode materials. The flame retardant organic electrolyte is applied to Zn / / Na 3 V 2 (PO 4 ) 2 o 2 In the F rechargeable zinc battery system, the safety of the battery can be significantly improved, and this zinc battery system has a high discharge voltage platform and good cycle stability, and has broad application prospects.

The invention discloses a garnet-type composite electrolyte material and a preparation method thereof, belonging to the field of new energy materials. The garnet-type composite electrolyte material is a core with a garnet-type oxide as the core and a coordination hydride as the shell shell structure; the preparation method of the garnet-type composite electrolyte material of the present invention, comprising: under the protection of an inert gas, redox reactions occur between the garnet-type oxide and the coordination hydride under the action of ball milling to obtain the garnet-type composite electrolyte material electrolyte material. The garnet-type composite electrolyte material prepared by the present invention has the advantages of high lithium ion conductivity and high voltage window, can be applied to the preparation of all-solid lithium-ion batteries, and has high application value in the industrial production of all-solid-state lithium-ion batteries .

The invention provides a method for preparing a zinc-cobalt double metal oxide sandwich structure flexible film electrode, based on the vacuum filtration method, (1) dispersing cellulose nanofibrils and multi-walled carbon nanotubes in water, ultrasonic, magnetic Stir to obtain a uniform dispersion of cellulose nanofibrils-multi-walled carbon nanotubes; (2) disperse cellulose nanofibrils and zinc-cobalt double metal oxides in water, ultrasonically and magnetically stir to obtain uniform cellulose Nanofibril-zinc-cobalt double metal oxide dispersion; (3) cellulose nanofibril-multiwall carbon nanotube dispersion and cellulose nanofibril-zinc-cobalt double metal oxide dispersion are successively suction filtered Forming a film to obtain a flexible film electrode with a sandwich structure of coating layer-sandwich layer-coating layer-sandwich layer-coating layer. The invention aims to prepare a high-performance flexible and lightweight electrode material, which has broad application prospects in the fields of portable electronics and energy products.

The invention provides a Li-ion supercapacitor. The active material of a positive plate of the Li-ion supercapacitor comprises a porous carbon material and LiNixCoyMnzO2; the porous carbon material is at least one of active carbon, an active carbon fiber, porous graphitized carbon black and graphene; the ratio of the porous carbon material to LiNixCoyMnzO2 is (1:1)-(1:4), wherein x+y+z=1, x:y:z=5:2:3 or x:y:z=5:3:2 or x:y:z=6:2:2 or x:y:z=7:1.5:1.5 or x:y:z=8:1:1; the active material of a negative plate is at least one of synthetic graphite, interphase graphite, mesocarbon microbeads, hard carbon and soft carbon; the mass ratio of the LiNixCoyMnzO2 contained in the positive plate to the active material contained in the negative plate is 0.5-1.6; the electrolyte of the Li-ion supercapacitor consists of an electrolyte salt and an organic solvent; the electrolyte salt is selected from LiPF6 or LiBF4 or LiBOB or LiFSI; and the organic solvent is at lest one of ethylene carbonate, carbonic allyl ester, carbonic methyl ester, methyl carbonate, diethyl carbonate and acetonitrile.

This patent discloses a high-voltage flame-retardant electrolyte formula, which is applied to lithium-ion secondary batteries. The main feature of the invention is that phosphoric acid ester is used as a solvent component, which forms a solvation structure with lithium salt in a certain ratio, and is dispersed in a fluoroether solvent. Phosphate ester coordinates with lithium ions to form a certain solvation structure, which effectively prevents co-intercalation of graphite with lithium ions. By introducing fluoroether, the viscosity of the electrolyte is reduced, the wettability of the electrolyte is increased, and the thermal and electrochemical stability of the electrolyte are not affected, and the fluoroether is also non-flammable and does not affect the electrolyte flame retardant effect. The electrolyte solution provided by the invention can form a dense and stable protective film on the surface of the positive electrode and the negative electrode, and the capacity retention rate of the NCM 811||Li half-cell after 200 cycles reaches more than 90%, and at the same time, it has good compatibility with graphite. Using this electrolyte can significantly improve the high-voltage cycle stability of the electrolyte and battery safety.

The invention discloses an electrolytic solution, which comprises a solvent and an electrolyte; wherein, the solvent is a mixture of an organic solvent and water, wherein the mass ratio of the organic solvent to water is 1 / 10-1 / 1; The electrolyte is a soluble salt of alkali metal and / or zinc. The electrolyte has good high-voltage and low-temperature resistance, has a high-voltage window and a wide operating temperature range, and can be preferably used in supercapacitors or hybrid capacitors. The invention also discloses the application of the electrolyte.

A preparation method of a low-temperature solid-state electrolyte and its application in a low-temperature solid-state supercapacitor, adding acetone to polyvinylidene fluoride-hexafluoropropylene PVDF-HFP, fully dissolving to obtain a transparent viscous solution A, adding electrolyte to the solvent Salt, mix evenly to get electrolyte solution B, mix solutions A and B evenly to get precursor solution C, scrape or cast the precursor solution on a clean and smooth substrate, and get 20-100um low-temperature solid state after natural drying Electrolyte membrane, the solid electrolyte prepared by the present invention has high electrical conductivity at low temperature, and the preparation method is simple and easy, and has wide applicability; the low temperature solid electrolyte is applied to the preparation of low temperature solid supercapacitor, and the prepared solid supercapacitor has a low working temperature To -60°C, it has excellent rate performance, low internal resistance, high energy density and long cycle life at low temperature, which broadens the application of low-temperature solid-state supercapacitors in military or civilian fields.

The invention relates to a preparation method of an extensible asymmetric supercapacitor based on Ag / PPy / MnO2 composite nano-materials. The preparation method is characterized in that the prepared Ag / PPy / MnO2 composite nano-materials have the advantages of excellent capacitive performance, preferable flexibility, high stability, low cost and preferable printability; extensible fabric base materials with super flexibility are selected; and by means of a screen printing mode, silver paste, the synthetic Ag / PPy / MnO2 composite nano-materials, active carbon and PVA-Na2SO4 solid electrolyte are printed into a flexible solid state asymmetric supercapacitor. The energy density of the asymmetric supercapacitor prepared by the preparation method can achieve 30.9 mu Wh cm-2; after 2,5000 times of constant current charge and discharge, the capacitance retention rate of the asymmetric supercapacitor is 90.8%; after 40% of extension, the capacitance retention is 89.2%; and at the same time, the prepared asymmetric supercapacitor can maintain preferable flexibility and mechanical performance under different flexible conditions (extension, warping, curving and bending), and a red 2.8V LED lamp canbe lightened under the above conditions.

The invention discloses a low-voltage and high-load self-supporting potassium ion battery negative electrode material and a preparation and application thereof. The preparation method comprises the following steps: preparing a mixed strong acid according to a volume ratio of a first strong acid to a second strong acid of 0.2-3: 1, adding a carbon material into the mixed strong acid, carrying out areaction for 1-72h at the temperature of 50-90 DEG C, and then carrying out cleaning and drying to obtain a treated carbon material; and finally, annealing the treated carbon material at the temperature of 300-1000 DEG C for 0.5-5 hours. According to the invention, the common commercial carbon material is subjected to simple acidification treatment, and oxygen-containing functional groups are introduced into the surface, thereby reducing the reaction energy barriers, facilitating the embedding and escaping of potassium ions into and from the surface of the carbon material, so that the specific capacity and the rate capability are improved, the low-voltage platform characteristic of the carbon material is fully embodied, the voltage window of a device is improved, and the preparation method has very important significance for designing a potassium ion battery with high energy density.

The invention discloses a low-voltage, high-capacity self-supporting potassium ion battery negative electrode material and its preparation and application. The preparation method comprises the following steps: first strong acid: second strong acid = 0.2-3:1 to prepare a mixed strong acid in terms of volume, adding carbon materials to the mixed strong acid and reacting at 50-90° C. for 1-72 hours, and then Washing and drying to obtain the treated carbon material; finally annealing the treated carbon material at 300-1000° C. for 0.5-5 hours. The present invention performs simple acidification treatment on common commercial carbon materials, and introduces oxygen-containing functional groups on the surface, thereby reducing the reaction energy barrier and facilitating the insertion and extraction of potassium ions on the surface of carbon materials, thus improving the specific capacity and rate characteristics, and making the carbon materials themselves The characteristics of the low-voltage platform are fully reflected, which is conducive to improving the voltage window of the device, which is of great significance for the design of potassium-ion batteries with high energy density.