32results about How to "High capacitance retention" patented technology

The invention discloses an isoindole nitrogen oxide free radical modified polyaniline and a preparation method and an application thereof. 2-, 3-, 5- and 6-site side groups in aniline repeating structural units of a polyaniline high molecular material are chemically modified by an isoindole nitrogen oxide free radical derivative to obtain the product. Or 2-, 3-, 5- and 6-site side groups of aniline monomers are chemically modified by the isoindole nitrogen oxide free radical derivative, and then a polymerization reaction is carried out to obtain the product. Compared with polyaniline, the free radical polymer has better electrical conductivity, higher charge storage density, better capacitance retention rate, fast electrode reaction dynamics performance, and oxidation-reduction ability and characteristic three-line electron paramagnetic resonance spectra similar to isoindole free radicals; and the polymer has good rate capability and cycle stability in the processes of charging and discharging, and is expected to become a novel high-capacity and high-power battery material.

The invention discloses an isoindole nitrogen oxide free radical modified polypyrrole and a preparation method and an application thereof. 3- and 4-site side groups in pyrrole repeating structural units of a polypyrrole high molecular material are chemically modified by an isoindole nitrogen oxide free radical derivative to obtain the product. Or 3- and 4-site side groups of pyrrole monomers are chemically modified by the isoindole nitrogen oxide free radical derivative, and then a polymerization reaction is carried out to obtain the product. Compared with polypyrrole, the modified polypyrrole has better electrical conductivity, higher charge storage density, better capacitance retention rate, fast electrode reaction dynamics performance, and oxidation-reduction ability and characteristic three-line electron paramagnetic resonance spectra similar to isoindole free radicals; the polymer has good rate capability and cycle stability in the processes of charging and discharging; and after 500-cycle charging and discharging circulation, the coulomb efficiency can be still kept at 95% or more, and the modified polypyrrole is expected to become a novel high-capacity and high-power battery material.

Disclosed is a separator for electric double layer capacitors which is composed of a porous sheet containing a fibrillated heat-resistant fiber, a polyester fiber having a fineness of not less than 0.01 dtex and less than 0.10 dtex, and a fibrillated cellulose. The separator for electric double layer capacitors is suitable for an electric double layer capacitor which operates at a high voltage of not less than 3 V.

The invention relates to a lithium ion secondary battery anode material and a preparation method. The lithium ion secondary battery anode material adopts the unburned carbon of fuel fly ash as a carbon material. The invention also provides the preparation method for the lithium ion secondary battery anode material. The preparation method comprises the following steps of: grinding the unburned carbon in a ball mill, and performing heat treatment, wherein a temperature range required by the heat treatment is 2,000 to 3,200 DEG C; and preserving heat for a certain time, cooling the unburned carbon to room temperature, performing acid treatment by adopting acidic aqueous solution, and thus obtaining power which is unburned carbon graphite powder as the lithium ion secondary battery anode material. After kinds of analysis are performed on the unburned carbon graphite powder, the graphitizing grade and crystallinity of the unburned carbon graphite powder are increased, and the unburned carbon graphite powder with such a structure and such components has relatively higher capacity retentions, simultaneously meets the requirements of relatively lower cost and environmental friendliness and is proved to be sufficient to serve as the lithium ion secondary battery anode material.

An electric double layer capacitor has a pair of current collectors, a positive polarizable electrode which is provided on one of the pair of current collectors, includes activated carbon of a weight W + and has a capacitance C + , a negative polarizable electrode which is provided on the other of the pair of current collectors, includes activated carbon of a weight W - and has a capacitance C_, a separator interposed between the positive and negative polarizable electrodes, and an organic electrolytic solution which impregnates at least the positive and negative polarizable electrodes and the separator, wherein C - / C + = 0.6 to 1.0 and W - / W + = 1.1 to 2.0. Even when continuously charged at a high applied voltage, the electric double layer capacitor has a high retention of capacitance and a low rise in internal resistance, and thus has an excellent durability.

The invention discloses agarose / polyaniline compound gel, a method for preparing the same and application of the agarose / polyaniline compound gel. The agarose / polyaniline compound gel is of a sandwich polyaniline / agarose electrolyte / polyaniline integrated structure. The method includes steps of (1), adding agarose into electrolyte solution with certain concentration, uniformly mixing the agarose and the electrolyte solution with each other and then pouring the agarose and the electrolyte solution into molds to obtain agarose gel; (2), arranging the agarose gel in aniline solution, attaching aniline to the surfaces of the agarose gel and then immersing the agarose gel in oxidizing agent solution to obtain the agarose / polyaniline compound gel by means of oxidative polymerization. Current collectors can be arranged on the surfaces of the agarose / polyaniline compound gel, so that flexible supercapacitors on the basis of the agarose / polyaniline compound gel can be assembled. The agarose / polyaniline compound gel, the method and the application have the advantages that procedures for preparing the agarose / polyaniline compound gel are simple, electrodes and electrolyte layers are integrated on the agarose / polyaniline compound gel, the agarose / polyaniline compound gel is good in mechanical property and flexible bending property, and the supercapacitors made of the agarose / polyaniline compound gel are excellent in flexibility, capacitive character and cycling stability.

The invention belongs to the technical fields of metal thermal reduction reactions and graphene materials, and particularly discloses a method for reducing carbon dioxide into a porous carbon material, and the porous carbon material and application thereof. The method comprises the following specific steps: carrying out heat treatment on magnesium-containing metal in a CO2-containing atmosphere; after a reaction is finished, stirring an obtained product in an HCl solution; and purifying the obtained mixture, and carrying out drying overnight at room temperature to obtain the porous carbon material. The specific surface area of the porous carbon material prepared from the magnesium-zinc mixture can reach 1800-2000 m<2> / g; the conductivity of the material is as high as 1000 to 1100 S / m; thecapacitance retention rate is high; the tap density of the material is almost the same as the tap density of activated carbon and is 0.60-0.65 g / cm<3>; so the porous carbon material is an ideal material for preparing a high-power electrochemical capacitor electrode. The porous carbon material prepared from the magnesium-copper mixture has the advantages of favorable specific surface area and goodcrystallinity, and is an ideal material for preparing electrodes of microbial fuel cells.

The invention discloses an application of an aqueous alkaline electrolyte in preparation of an electrolyte of a zinc-based hybrid supercapacitor. The aqueous alkaline electrolyte comprises alkali andwater, wherein the alkali is alkali metal hydroxide and / or alkali metal acetate, and the concentration of the alkali is 0.1-13 mol / L. The invention further discloses the aqueous alkaline electrolyte which comprises alkali, zinc salt and water, wherein the alkali is alkali metal hydroxide and / or alkali metal acetate, the concentration of the alkali is 0.1-13 mol / L, and the molar concentration ratioof the alkali to the zinc salt is larger than 100: 1 and smaller than or equal to 13000: 1. The invention further provides a zinc-based hybrid supercapacitor and a preparation method thereof. The zinc-based hybrid supercapacitor prepared by the invention can maintain or obtain a wider electrochemical window on the basis of maintaining the power density, also has higher specific capacity and energy density, and shows a high capacitance retention rate in a long-cycle effect test.

The invention relates to a method for preparing nanometer porous carbon with xanthoceras sorbifolia bunge seed coats, nanometer porous carbon, a super-capacitor electrode slice and a preparation method of the super-capacitor electrode slice. Through regulation and control of the activation temperature and the dosage of an activator; for xanthoceras sorbifolia bunge seed coat porous carbon, the specific surface area is 2148m2 / g, a porous structure is formed by a great amount of micropores which are regularly and closely arranged, and the pore diameter distribution is 2nm or below. For an electrode prepared with the porous carbon, the specific capacitance at the current density of 0.5A / g reaches up to 429F / g, the electrode still has very good specific capacitance (128F / g) when the current density rises to 20A / g, and the capacitance retention still reaches up to 98.7 percent after the electrode is charged or discharged for 1000 times under the condition with the current density being 10A / g. The porous carbon prepared with the xanthoceras sorbifolia bunge seed coats as a raw material has good electrochemical performance, can be used as an electrode material for a super-capacitor and provides a new thought and way of comprehensive development and utilization of xanthoceras sorbifolia bunge resources.

The invention discloses a group matching method for recycling of recovered power batteries. The method comprises the steps of establishing a database, measuring the voltage and the internal resistance of the recovered power batteries, selecting the recovered power batteries with the voltage and the internal resistance within preset ranges, performing charging and discharging detection on the selected recovered power batteries to acquire the capacity of the recovered power batteries and corresponding relations between charging states and the voltage during charging, selecting the recovered power batteries with the capacity within preset ranges, matching the corresponding relations between the charging states and the voltage during the charging of the selected recovered power batteries with corresponding relations between charging states and the voltage during the charging of the power batteries in the database at different cycle periods, and performing group matching on the recovered batteries with the corresponding relations between the charging states and the voltage during the charging within preset ranges. The group matching method for the recycling of the recovered power batteries can perform group matching according to the attenuation degree of the recovered power batteries, thereby improving the accuracy and the reliability of the group matching.

The invention discloses biomass activated carbon, a preparation method and application thereof, and an electrode. The preparation method of the biomass activated carbon comprises the following steps:(1) carrying out primary activation on a mixture of biochar and an alkali at 500-900 DEG C to obtain a precursor A; (2) carrying out secondary activation on the precursor A in an oxidizing gas atmosphere at 500-900 DEG C to obtain a precursor B; (3) washing the precursor B to be neutral, and then drying to obtain a precursor C; and (4) carbonizing the precursor C to obtain the biomass activated carbon. According to the invention, the biomass activated carbon prepared by the preparation method has high specific surface area and high mesopore ratio at the same time; and when an electrode prepared from the biomass activated carbon is used for a supercapacitor, the specific volume is large, and the capacitance retention rate is high.

The invention discloses an electric-conduction composite material, a negative electrode material prepared from the electric-conduction composite material, and a secondary battery. The electric-conduction composite material comprises: a core part, wherein the core part comprises a first material selected from a group comprising a fourth main group element (IVA), a metal, a metal compound or an alloy; an inner coating layer, wherein the surface of the core part is coated with the inner coating layer, and the inner coating layer is prepared from a group comprising the oxides, the nitrides or thecarbides of the first material; and an outer coating layer, wherein the surface of the inner coating layer is coated with the outer coating layer, and the outer coating layer is prepared from a carbonmaterial and at least a second material (doping material) containing a halogen or a fifth main group element (VA).

The invention discloses a preparation method of a high-performance supercapacitor electrode. The method is characterized by comprising the steps of firstly, preparing an h-MoO3 nanometer material by means of a hydrothermal method; secondly, conducting annealing treatment on the h-MoO3 nanometer material, and obtaining an alpha-MoO3 nanometer laminated material; mixing the alpha-MoO3 nanometer laminated material as an active substance with a conductive substance and a binder to prepare the supercapacitor electrode. When the current density is 2Ag-1, the specific capacitance performance of the MoO3 electrode prepared by means of the method is excellent and can reach 1417Fg-1 which is the highest value publicly reported under the same test condition on the basis of the material at present; after the MoO3 electrode prepared by means of the method is charged and dischargd 2,000 times under the condition that the current density is 10Ag-1, and the capacitance retention rate is high and can reach 60%.

The invention discloses a lithium ion battery cathode active substance and a manufacturing method thereof. A cathode active substance layer consists of the following components in percentage by weight: 20-50% of carbon (C), 20% of copper (Cu), 1-5% of phosphorus (P) and the balance being tin (Sn). By taking the tin-carbon-copper-phosphorus alloy as a cathode active substance, the lithium battery has high capacitance maintenance characteristic in high load and low load. According to the manufacturing method of the lithium ion battery cathode active substance, the heating temperature is low, and the energy consumption is low.

The invention discloses a carbon hollow sphere coated metal selenide composite material as well as a preparation method and application thereof, and relates to the technical field of green energy materials. The composite material is of a double-layer structure, the inner layer of the composite material is NiSex nanoparticles, the outer layer of the composite material is carbon hollow spheres, and the NiSex nanoparticles of the inner layer of the composite material are uniformly dispersed in the carbon hollow spheres. The invention further discloses a preparation method and application of the NiSex-coated CBs composite material. According to the invention, Ni-soc-MOF is taken as a template, an in-situ selenylation method is adopted to successfully prepare a composite material in which a nickel-selenium compound is embedded into a carbon hollow sphere, the specific capacitance of NiSe (at) CBs reaches up to 1720F g <-1 > when the current density is 1A g <-1 >, and the NiSe (at) CBs / / AC asymmetric supercapacitor has high energy density of 45.2 W h kg <-1 > under the power density of 800kW kg <-1 >, shows excellent energy storage performance, and can be applied to the field of supercapacitor devices. The capacitance retention rate of the NiSexCBs / / AC asymmetric supercapacitor after 5000 cycles still reaches up to 89%, and the NiSexCBs / / AC asymmetric supercapacitor shows high cycle stability.

The invention belongs to the field of preparation of ZnNCN materials, in particular to a low-cost ZnNCN material preparation method. The method comprises the following step of synthesizing truncated rhombic dodecahedral zeolite imidazole ester skeleton-8 (TRD-ZIF-8) nanoparticles, concretely, adding 10ml of an aqueous solution in which Zn (CH3COO) 2.2 H2O (600mg) is dissolved into 10ml of an aqueous solution in which 2-methylimidazole (0.54 mM) and CTAB (2.58 mM) are dissolved, slowly stirring the solution for several seconds, after 10 minutes, changing the original transparent solution into awhite solution, standing the solution at room temperature for 3 hours, carrying out centrifuging at 9000r.p.m, enriching the solution in a 50mL centrifuge tube, and then washing the obtained TRD-ZIF-8 nanoparticles with deionized water for three times. The ZnNCN material disclosed by the invention is relatively high in yield, and the nanoparticles are relatively small in particle size, relativelylarge in specific surface area and stable in electrochemical performance.

The invention relates to a one-step preparation method of polyaniline-titanium dioxide nanotube array composite electrode. The method comprises the following steps of: adding ammonium fluoride, aniline and concentrated sulfuric acid into a mixed solvent, stirring and dissolving to obtain a mixed solution; Using this mixed solution as electrolyte, metal titanium plate as anode and platinum plate ascathode,anoding at 0-10 DEG C, 20-50V for 1-5 hour. The oxidized anode plate is washed with deionized water and dried to obtain polyaniline. TiO2 nanotube array composite electrode. The invention greatly simplifies the process steps, shortens the process flow and obtains excellent electrode performance.

A carbon nanotube composite material with a hierarchical structure is characterized in that a carbon nanotube with the hierarchical structure is composed of a fine carbon nanotube with a tube diameter of 5-10 nm and a coarse carbon nanotube with a tube diameter of about 200 nm, the coarse carbon nanotube has a branched structure, and the fine nanotube is spirally wound on the surface of the coarse carbon nanotube. According to the carbon nanotube composite material with the hierarchical structure, the electrochemical performance of the material is improved, the power density reaches 73.2 Wh.kg <-1>, when the current density is 1A / g, the specific capacitance is 252.6 F / g which is 1.4 times that of a single large-diameter branched carbon nanotube, the carbon nanotube composite material has excellent cycle stability, and the extremely high capacitance retention rate is still kept after 10000 times of circulation.

The invention discloses a preparation method of a high-performance supercapacitor electrode. The method is characterized by comprising the steps of firstly, preparing an h-MoO3 nanometer material by means of a hydrothermal method; secondly, conducting annealing treatment on the h-MoO3 nanometer material, and obtaining an alpha-MoO3 nanometer laminated material; mixing the alpha-MoO3 nanometer laminated material as an active substance with a conductive substance and a binder to prepare the supercapacitor electrode. When the current density is 2Ag-1, the specific capacitance performance of the MoO3 electrode prepared by means of the method is excellent and can reach 1417Fg-1 which is the highest value publicly reported under the same test condition on the basis of the material at present; after the MoO3 electrode prepared by means of the method is charged and dischargd 2,000 times under the condition that the current density is 10Ag-1, and the capacitance retention rate is high and can reach 60%.

The invention provides a method for preparing a bean dregs-based nitrogen-boron co-doped porous carbon material, which is characterized in that the method is a one-step dipping and carbonization activation method, comprising the following steps: (1) pretreating the bean dregs: boiling, fermenting , Add catalyst to the fermented bean dregs to catalyze, freeze-dry after washing; (2) add deionized water to the pretreated bean dregs, add activator and boron source to stir and mix, transfer to a petri dish, put into a drying box (3) heat-treat the bean dregs processed in step (2), soak them in HCl solution after cooling down, wash them, and finally obtain the processed bean dregs through microwave drying; (4) process the bean dregs after step (3) A binder and a pore-forming agent are added to the bean dregs, and the bean dregs-based porous carbon material is formed after mixing. The invention adopts a one-step dipping and carbonization activation method. Compared with the prior art, the one-step dipping and carbonization activation method has the advantages of simple method, low energy consumption and the like.

The invention discloses a supercapacitor electrode material and a preparation method thereof. The electrode material comprises a reduced graphene oxide / aniline tetramer composite material, and the mass ratio of the aniline tetramer to the reduced graphene oxide is 4-1: 1-4. The preparation method comprises the following steps: (1) adding N. Phenyl-1, 4-Phenylenediamine is dissolved in a mixture ofacetone, water and hydrochloric acid. 2, stir in an ice bath, slowly adding ammonium persulfate solution when that temperature drop to 0 DEG C, stirring, vacuum filtering, washing with hydrochloric acid for many time, and washing with acetone and large amount of deionized water to neutrality; 3) vacuum dry that product to obtain aniline tetramer; 4) adde aniline tetramer into graphene oxide suspension, ultrasonic stirring, heat, natural cooling, vacuum filtration and vacuum drying; 5. Mix that reduced graphene oxide / aniline tetramer composite, the conductive agent and the bind. The electrodematerial of the supercapacitor prepared by the invention has high specific capacitance and high cycle stability.

A carbon nanotube composite material with a hierarchical structure, characterized in that: the carbon nanotubes of the hierarchical structure are composed of thin carbon nanotubes with a diameter of 5-10nm and thick carbon nanotubes with a diameter of about 200nm, The thick carbon nanotubes have a branch structure, and the thin nanotubes are helically wound on the surface of the thick carbon nanotubes. The carbon nanotube composite material with hierarchical structure of the present invention improves the electrochemical performance of the material, and its power density reaches 73.2Wh·kg ‑1 , when the current density is 1A / g, its specific capacitance is 252.6F / g, which is 1.4 times that of branched carbon nanotubes with a single thick tube diameter. It has excellent cycle stability and remains extremely high after 10,000 cycles. capacitance retention rate.

The invention belongs to the technical field of metallothermal reduction reaction and graphene materials, and specifically discloses a method for reducing carbon dioxide into porous carbon materials, porous carbon materials and applications. Described method is specifically: the metal that contains magnesium contains CO 2 After the reaction, the resulting product was stirred in HCl solution; then the resulting mixture was purified and dried overnight at room temperature to obtain a porous carbon material. The specific surface area of ​​the porous carbon material prepared by the magnesium-zinc mixture in the present invention can reach 1800-2000m 2 / g; conductivity as high as 1000-1100S / m; high capacitance retention and tap density are almost the same as activated carbon, which is 0.60-0.65g / cm 3 , is an ideal material for the preparation of high-power electrochemical capacitor electrodes. The porous carbon material prepared by the magnesium-copper mixture in the invention has good specific surface area and good crystallization performance, and is an ideal material for preparing microbial fuel cell electrodes.

The invention relates to a fluorinated modified MXene-based conductive composite material and a preparation method thereof, and belongs to the technical field of composite materials, Ti3AlC2 is subjected to fluorinated etching, a fluorine group is introduced, Ni < 2 + >, Co < 2 + > and La < 3 + > react with S < 2 > generated by disproportionation reaction of sulfur powder under a hydrothermal condition to generate metal sulfide nanocrystals, the metal sulfide nanocrystals are anchored on the surface of fluorinated MXene powder, and the fluorinated modified MXene-based conductive composite material is obtained. Meanwhile, ammonium fluoride supplements fluorine ions to further regulate and control surface groups, melamine is induced to form a titanium vacancy defect in subsequent heat treatment, active sites are enriched, an electron transmission path is optimized, nitrogen doping and heat treatment of dopamine form a nitrogen-doped carbon layer, a three-dimensional conductive network is constructed, the interface bonding force is enhanced, and the conductivity of the electrode is improved. In-situ generation of ZnIn2S4 and interlayer insertion of graphene oxide increase additional active sites and effectively inhibit agglomeration, so that the specific capacitance and cycling stability of the fluorinated modified MXene-based conductive composite material are synergistically improved.

The invention relates to a graphene composite material loaded with cobalt niobate oxide and a preparation method and application thereof. The composite material includes graphene and CoNb supported on the surface of the graphene 2 O 6 material, wherein the CoNb 2 O 6 The material includes at least one stem and a plurality of branches extending outwardly from the stem. The composite material induces the growth of CoNb with a unique backbone-branch structure and high crystallinity through the surface confinement of graphene. 2 O 6 The composite material has high capacity, excellent cycle stability and electrochemical performance, and has a good application prospect as a negative electrode material for lithium ion batteries.

A purpose of the present invention is to provide a sulfide solid electrolyte with which it is possible to obtain a lithium-ion cell having a high capacity retention rate. The present invention pertains to a sulfide solid electrolyte containing lithium, phosphorus, and sulfur. The sulfide solid electrolyte has, in powder X-ray diffraction in which CuK alpha radiation is used, a diffraction peak A at 2 theta = 25.2 + / - 0.5 deg and a diffraction peak B at 29.7 + / - 0.5 deg. The area ratio, in relation to the total area of a glass-derived peak observed by solid 31P-NMR measurement, of a PS4 3-glass-derived peak is 90-100%, and the area ratio of the glass-derived peak in relation to the total area of all peaks in 60-120 ppm observed by solid 31P-NMR measurement is 1-45%.