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

Super-capacitor electrode based on vertical oriented graphene and manufacturing method thereof

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.
Owner:ZHEJIANG UNIV

Li-ion supercapacitor

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.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI

All-solid composite polymer electrolyte and preparation method thereof, and lithium ion battery

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.
Owner:SHENZHEN BAK POWER BATTERY CO LTD

Preparation method of high-voltage-resistant solid polymer electrolyte

A preparation method of a high-voltage-resistant solid polymer electrolyte includes the steps of: 1) according to certain ratio, dissolving a polymer substrate, lithium salt, and an inorganic additivein anhydrous acetonitrile and stirring the mixture at room temperature to obtain a uniform solution, wherein the polymer substrate is polyoxyethylene, the lithium salt is lithium bistrifluoromethylsulfonimide or lithium perchlorate; the inorganic additive is nano-wires or nano-particles of zinc borate, aluminum borate, sodium tetraborate, barium metaborate or calcium borate, the mass ratio of thepolyoxyethylene to the lithium salt EO : Li<+> is 10-20:1, and the mass of the inorganic additive is not more than 20% of the total mass of the polymer substrate and lithium salt; 2) pouring the solution into a polytetrafluoroethylene mold to volatilize the solution until completely dried, thus preparing the solid polymer electrolyte. The method improves the high-voltage resistance of the solid polymer electrolyte, so that the product fits a high-voltage ternary cathode material and energy density and safety of an all-solid-state battery are improved.
Owner:ZHEJIANG UNIV OF TECH

High-voltage and high-rate type lithium cobalt oxide cathode material and preparation method thereof

The invention discloses a high-voltage and high-rate type lithium cobalt oxide cathode material and a preparation method thereof. The preparation method comprises steps as follows: cobalt oxide and lithium carbonate are taken as precursors, magnesium carbonate is added, and lithium cobalt oxide can be obtained after primary sintering and breaking; an aluminum alkoxide and titanate mixed alcoholic solution is added, secondary sintering is performed after mixing, and lithium cobalt oxide can be obtained. When discharge voltage is up to 4.5 V and the rate is 0.2C (1C=177.5 mAh / g), specific capacity of lithium cobalt oxide prepared with the method is higher than 190 mAh / g, rate performance of 1C / 0.2C is higher than 98%, and 3.6V voltage platform occupancy is higher than 99%; the material has the characteristics of stable structure and smaller specific discharge capacity attenuation in a high-voltage and high-rate charging and discharging process; according to the method, a voltage window, capacity performance and rate performance of the lithium cobalt oxide cathode material are successfully improved, further, the technology is simple, the implementation is convenient, the cost is low, and the prepared high-voltage and high-rate type lithium cobalt oxide cathode material has excellent electrochemical performance.
Owner:ENERGY RESOURCES INST HEBEI ACADEMY OF SCI

Preparation method of low-temperature solid electrolyte and application of low-temperature solid electrolyte in low-temperature solid supercapacitor

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.
Owner:XI AN JIAOTONG UNIV

Method for preparing high-energy-density supercapacitor by taking oxide as template

The invention provides a method for preparing a high-energy-density supercapacitor by taking oxide as a template. The method belongs to the technical field of supercapacitors, and comprises the steps of: mixing the oxide, polyvinylidene chloride and melamine in an organic solvent, and conducting ball milling on the mixture to obtain a precursor; placing the precursor in an oven for drying, increasing the temperature quickly under the condition of inert gas protection, and calcining the precursor at high temperature to obtain a porous mesoporous carbon material; and pickling the obtained carbon material, and then forming the capacitor by adopting the pickled carbon material and a neutral electrolyte. Tests show that the prepared supercapacitor has a very high voltage window which can be up to 1.8 v while the energy density is up to 21.5 Wh / kg<-1>.
Owner:BEIJING UNIV OF CHEM TECH

Two-dimensional metal titanium carbide loaded MnOx quantum dot electrode material and application thereof

The invention discloses a two-dimensional metal titanium carbide loaded MnOx quantum dot electrode material which is an MXene loaded manganese oxide nano dot composite material prepared by taking MXene with high conductivity as a base material and manganese carbonyl as a precursor through a simple solvothermal reaction. And the ionic liquid is selected as the electrolyte, so that the working voltage window is further widened, and the energy density is improved. The oxide nanodot is a pseudocapacitance material with a quantum size effect, and the composite material prepared by loading the oxide nanodot on the surface of MXene can improve the reaction activity and increase pseudocapacitance; as a barrier material, the nanodots can avoid stacking and collapse of MXene sheet layers; the prepared composite material is further prepared into an electrode for a supercapacitor, and an electrochemical test result in an ionic liquid electrolyte shows that the specific capacity and the rate capability are remarkably improved. And the method has certain universality, can be applied to systems of other electrode materials loaded with ultra-small-size metal oxides, and has a relatively good application prospect.
Owner:NORTHWEST UNIV

Preparation methods of porous carbon fiber/metal oxide composite material and graphene-based conductive ink and application of graphene-based conductive ink in supercapacitor

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.
Owner:HUNAN UNIV

Preparation method of sodium manganese oxide and application of sodium manganese oxide in super capacitor

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.
Owner:NANCHANG UNIV

Super capacitor

The invention relates to a super capacitor which comprises an elastomer, an inner electrode, a first electrolyte layer and an outer electrode, the inner electrode, the first electrolyte layer and the outer electrode sequentially wrap the outer surface of the elastomer, the inner electrode comprises a first carbon nanotube layer and a NiO@MnOX composite structure, and the outer electrode comprises a second carbon nanotube layer and a Fe2O3 particle layer.
Owner:TSINGHUA UNIV +1

Preparation method of Ni(OH)2/graphene composite material and preparation method of supercapacitor

The invention discloses a preparation method of a Ni(OH)2 / graphene composite material, which comprises the following steps of adding porous graphene oxide dispersion liquid into N, N-dimethylformamide, adding nickel acetate, reacting at constant temperature, centrifuging and washing, and dissolving the washed product in water, carrying out hydrothermal reaction, and after the reaction is finished, drying to obtain the Ni(OH)2 / graphene composite material. The invention also provides a method of the supercapacitor. The method comprises the following steps that Ni(OH)2 / HGO ink is prepared from the Ni(OH)2 / graphene composite material; and the silver paste and the Ni(OH)2 / HGO ink are sequentially overlaid and brushed on a PET plate through silk-screen printing to form a pattern, and drying is carried out to complete the preparation of the supercapacitor. According to the Ni(OH)2 / HGO composite nano material prepared by the invention, the voltage window of the supercapacitor can be improved to a great extent, so that the energy density of the supercapacitor is improved to a great extent.
Owner:HUNAN UNIV

Method for preparing transition metal complex heteroatom-doped porous carbon materials by impregnating recrystallized carbonized biomass

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.
Owner:HARBIN ENG UNIV

Hydrated glass-based sodium-ion battery quasi-solid electrolyte and preparation method and application

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.
Owner:ZHEJIANG UNIV

Lithium battery

The invention discloses a lithium battery which comprises a positive electrode, a negative electrode and an electrolyte solution, the active material of the positive electrode is lithium manganate oractive carbon, the active material of the negative electrode is lithium titanate, and the electrolyte comprises a confinement water molecule functional solute, a solvent and an electrolyte, wherein the confinement water molecule functional solute is selected from one or more of monosaccharide or disaccharide and the electrolyte is a soluble salt of alkali metal comprising lithium. The lithium battery has a high voltage window, a wide working temperature interval and high use safety.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

A phosphate-based high-voltage flame-retardant electrolyte

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.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

LLZTO/SPE composite electrolyte based on lithium lanthanum zirconium oxide and preparation method of LLZTO/SPE composite electrolyte

The invention relates to an LLZTO / SPE composite electrolyte based on lithium lanthanum zirconium oxide and a preparation method of the LLZTO / SPE composite electrolyte, and the preparation method comprises the following steps: mixing a porous thin-layer LLZTO solid electrolyte prepared by adopting a tape casting process with glycidyl ether oxypropyl cyclotetrasiloxane, polyethylene glycol diglycidyl ether, an initiator and a lithium salt, and heating and curing to obtain the LLZTO / SPE composite electrolyte. Compared with the prior art, the composite electrolyte has the advantages that the lithium ion transmission performance of an inorganic electrolyte LLZTO ceramic framework is good, the machinability of the composite electrolyte is good, the voltage window is wide and the like, the contact resistance of organic and inorganic electrolytes can be effectively improved, and the development of an all-solid-state battery is facilitated.
Owner:TONGJI UNIV

One based on ag/ppy/mno 2 Stretchable asymmetric supercapacitor and preparation method thereof

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.
Owner:WUHAN UNIV

Low-voltage and large-capacity self-supporting potassium ion battery negative electrode and preparation and application thereof

ActiveCN110544771AFully reflect the characteristics of the low-voltage platformFacilitates insertion and extractionNegative electrodesSecondary cellsHigh energyLow voltage
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.
Owner:JINAN UNIVERSITY

Low voltage, high capacity self-supporting potassium ion battery negative electrode and its preparation and application

ActiveCN110544771BFully reflect the characteristics of the low-voltage platformFacilitates insertion and extractionSecondary cellsNegative electrodesElectrical batteryHigh energy
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.
Owner:JINAN UNIVERSITY

Quasi-solid state electrolyte for sodium ion battery based on hydrated glass and preparation method and application thereof

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.
Owner:ZHEJIANG UNIV
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