180results about How to "Excellent electrochemical properties" patented technology

The invention has a grain structure with an outer shell and several inner cores. The grain size is from 100 nanometers to 100 microns. The inner cores are compound grain that includes active substance and conducting additive. The outer shell is a carbon layer. The active substance takes 20-95wt% of total cathode active material, and is mixture of one or several transition metallic compound selected from silicon and lithium storage whose thermodynamic equilibrium potential is less than 1.5v. The cathode material can be made by using mechanical process or thermal method, and can be directly used as cathode material or used with other existing cathode material.

The invention relates to a graphene-coated mesoporous metallic oxide, and a preparation method and use thereof. The preparation method for the graphene-coated mesoporous metallic oxide comprises the following steps of: 1) synthesizing mesoporous metallic oxides with different pore passage structures by taking mesoporous silicon dioxides with the different pore passage structures as templates; 2) preparing a graphene oxide by using an oxidation method; 3) absorbing mesoporous metallic oxide particles on the surface of the graphene oxide by using a heterocoagulation method; 4) reducing the graphene oxide into graphene by adding a reducing agent; and 5) performing centrifugal separation, washing and drying. The graphene-coated mesoporous metallic oxide provided by the invention has high electrochemical properties, and can be used as an electrode material of a lithium battery.

The invention relates to a lithium titanate-carbon co-cladded lithium manganese iron phosphate positive electrode material. According to the invention, the characteristic of zero stress of a lithium titanate material is utilized for inhibition of deformation of a positive electrode during charging and discharging so as to improve cycle performance and resistance to over-charge and over-discharge of the positive electrode material, and conductivity and electrochemical properties of the positive electrode material are improved through co-cladding of the lithium titanate material and carbon; meanwhile, tap density of lithium titanate is as high as 1.68 g/cm<3>, which enables influence of carbon cladding on the tap density of the positive electrode material to be reduced. A preparation method for the positive electrode material provided by the invention is simple, is easy to operate and can easily realize industrial application.

The invention provides a preparation method and applications of graphene aerogel. The graphene aerogel is prepared by the following steps: oxidizing a graphene water solution, and then preparing the graphene aerogel through a hydrothermal method. The graphene aerogel can be used as an ion-selective electrode, and can be especially used as an ion-selective electrode to detect the nitrate ions. The graphene aerogel is innovatively used as an ion-selective electrode applied in electrochemical detection, the detection results are excellent, and the application range of graphene aerogel based materials is enlarged.

The invention discloses a lithium-sulfur battery positive-pole composite material with an imitated cellular structure and a preparation method thereof. In the positive-pole composite material, a conductive polymer film layer and nanometer oxide inlaid inside the conductive polymer film layer form a cell membrane, an elemental sulfur particle serves as a cell nucleus, and the three portions jointly form the imitated cellular structure. The composite material is prepared by conducting ultrasonic dispersion on the elemental sulfur particle and the nanometer oxide in water in the presence of a surface active agent, adding a conductive polymer monomer and an acid solution, performing even stirring and then adding an oxidizing agent to perform stirring reaction. The preparation method is simple in process, low in cost, low in energy consumption, controllable in sulfur content and good in repeatability and enables large-scale production to be easily achieved. The composite material is made into a lithium-sulfur battery positive pole, loss of active substances in the charging-discharging process can be effectively inhibited, improvement of the specific discharge capacity of a battery material and the utilization ratio of the active substances is facilitated, and accordingly the battery cycle performance is greatly improved.

The invention relates to a thermal stable and super-hydrophobic ceramic-carbon nanotube composite membrane and application of membrane distillation water treatment thereof, and belongs to the technical field of inorganic membranes. The composite membrane is prepared by the following steps of adopting a chemical vapor deposition method, using a ceramic hollow fiber membrane as a carrier, changing the different preparation conditions, such as a loading amount of a catalyst, reaction temperature and reaction time, and controlling the structure, loading amount and load state of the carbon nanotube, so as to obtain the ceramic-carbon nanotube hollow fiber composite membrane with different structures and properties. The composite membrane has the advantages that by regulating and optimizing the preparation conditions, the thermal stable and super-hydrophobic composite membrane with a carbon nanotube complete covering structure is obtained; the seawater freshening, high-salt wastewater zero drainage, and other wastewater high-efficiency treatment, such as electroplating heavy metal wastewater, dyeing and printing wastewater and antibiotic wastewater, can be realized via the composite membrane; and the good membrane distillation property is realized.

The invention discloses a preparation method for carbon/tin/graphene composite nanofibers for a lithium ion battery, and belongs to the technical fields of nanomaterials and a chemical power supply. The preparation method comprises the steps of dissolving polyacrylonitrile, stannous chloride and graphene into N, N-dimethylformamide, and stirring uniformly to form a spinning solution; then preparing a polyacrylonitrile/stannous chloride/graphene composite nanofiber membrane through an electrospinning technique; and carrying out carbonization to obtain the carbon/tin/graphene composite nanofiber negative electrode material. The preparation process provided by the invention is simple, and the production cost is low; the composite nanofiber material prepared by the invention is used for the negative electrode material of the lithium ion battery, and the material has an excellent electrochemical property, a good cycling performance and high rate capability; the shortcoming of a poor cycling performance of a tin-based negative electrode material is overcome; and therefore, the carbon/tin/graphene composite nanofibers, which can used as the new generation of the negative electrode material of the lithium ion battery, can be widely applied in portable equipment.

The invention discloses a method for preparing a high-performance carbon material from molasses. The method comprises the following concrete steps: firstly, subjecting beet molasses with sugar-containing concentration of 8.8% to 52.5% to dehydration and carbonization for 2 to 10 h under the condition of 120 to 180 DEG C, carrying out washing and then carrying out drying for 12 h under the condition of 120 DEG C so as to obtain a colloidal carbon sphere with a size of 1 [mu]m to 10 [mu]m, then pretreating the obtained colloidal carbon sphere for 1 h under the condition of 500 DEG C, then carrying out activating treatment with concentrated phosphoric acid or KOH, subjecting an obtained product to washing until the pH is equal to 6 to 7, then carrying out drying for 12 h under the condition of 120 DEG C, and carrying out heating treatment for 1 h under the condition of 800 DEG C by filling of nitrogen so as to obtain a porous carbon material. The invention has the following beneficial effects: the colloidal carbon prepared from the molasses by hydrothermal treatment, after regulation of the KOH, has more developed porosity, can maintain morphology of the carbon sphere, and has a particle size of 1 [mu]m to 10 [mu]m; whether the colloidal carbon is regulated by the phosphoric acid or etched by potassium hydroxide, the obtained porous carbon material has high yield and small loss; and specifically, the porous carbon prepared from phosphoric acid has a yield up to 79.2%.

The present invention discloses a preparation method of a surface-modified manganese dioxide (MnO2) product loaded by an N-doped hollow carbon sphere (N-HCS). The method comprises the following stepsof: (1) preparing a hollow carbon sphere (HCS); (2) preparing a polydopamine-modified hollow carbon sphere (PDA-HCS); (3) preparing a graphene-modified N-doped hollow carbon sphere (N-HCS@Gr); (4) preparing a polyaniline-modified N-HCS@Gr (N-HCS@Gr@PANI); and (5) preparing a surface-modified MnO2 product loaded by an N-doped hollow carbon sphere (N-HCS@Gr@PANI@MnO2). The N-HCS@Gr@PANI@MnO2 productfully combines excellent performances of the N-doped hollow carbon sphere, a large superficial area and an excellent conductivity of graphene, reductibility and conductivity of the PANI and excellentcapacitance characteristics of the MnO2 itself, and therefore, the N-HCS@Gr@PANI@MnO2 product expresses very high specific capacitance and is electrode material of a super electrochemical capacitor with a wide application prospect.

The invention discloses a preparation method of a high-molecular-weight polylactic acid stereoscopic compound. The high-molecular-weight polylactic acid stereoscopic compound comprises the following raw materials in parts by weight: 2-30 parts of levorotatory polylactic acid, 2-30 parts of dextrorotary polylactic acid and 50-95 parts of ionic liquid. The stereoscopic compound is characterized by being obtained in a way that the levorotatory polylactic acid and the dextrorotary polylactic acid are formed into gel in the ionic liquid. The method disclosed by the invention is simple, practical and easy to operate, and thus can realize industrial large-scale continuous production. Meanwhile, according to the difference of the required materials in performance, inorganic filler can be additionally added. Compared with conventional solvent, the ionic liquid has non-volatility, high ionic conductivity and heat stability. Thus, the polylactic acid ionic gel can also be used as a solid electrolyte, and is hopefully used in the aspects of battery diaphragms, artificial intelligent drivers and the like.

The invention belongs to the technical field of a preparation and application of a primordial water hyacinth biomass carbon material with a porous structure, and specifically discloses a preparation method of a novel electrode material and an application of the electrode material as a cathode in an electro-Fenton system to degrade endocrine disruptors. The electrode material takes water hyacinth biomass powder as a precursor, zinc chloride powder is added in different proportions to perform activating, the novel biomass carbon material is prepared by high temperature calcination under the protection of an inert gas, and finally a porous electrode is obtained as the cathode material for E-Fenton to degrade endocrine disruptors. The material has relatively good electrical conductivity and relatively large specific surface area. The material can be used as a novel electrode material, and a good degradation effect is especially shown in the electro-Fenton experiment.

The invention provides a dual-metal hydroxide@ nickel molybdate@ graphene nanocomposite and a preparation method and an application thereof. Compared with the prior art, the preparation method disclosed in the invention achieves high product purity, high dispersity, high crystalline form and controllability, low production cost and high reproducibility; the prepared dual-metal hydroxide@ nickel molybdate@ graphene nanocomposite is grown on carbon cloth and can be directly used as a flexible electrode material of a supercapacitor, so that high stability, high specific capacitance, high energy density and power density are realized; and in addition, the carbon cloth has the flexible electrode and foldable and wearable properties, so that the nanocomposite has infinite development in the future wearable electrochemical energy storage equipment.

The invention relates to a copper oxide@nickel molybdate/ foamed copper composite electrode material and a preparation method thereof, and belongs to the field of an inorganic non-metal material. A nickel-molybdate precursor is coated on a copper hydroxide nanowire on a surface of foamed copper in an in-situ way and is calcined under an atmosphere of inert gas to obtain the copper oxide@nickel molybdate/ foamed copper composite electrode material with a core-shell structure. The core-shell nanowire array structure is directly grown on the foamed copper and is used as a positive electrode of asupercapacitor. Copper oxide is used as a core, nickel molybdate is used as a shell coated on the surface of the copper oxide, the active sites participating the electrochemical process are increased,and the capacitance value of the electrode material is improved. The material is simple in preparation process, has excellent and stable electrochemical performance, is suitably used as the electrodematerial of the supercapacitor and has wide application space in the field of the electrode material of the supercapacitor.

The invention relates to a preparation method of a bi-metal selenide sodium-ion battery cathode material. According to the preparation method, an MoSe2@CoSe2@C heterostructure is synthesized through asimple process so as to realize the aim of enhance the electrochemical performance of the sodium-ion batteries. According to the method, an MoO3 nanorod is firstly synthesized, a layer of Co-MOF nanosheet is grown on the surface of the MoO3 nanorod, and high-temperature selenylation calcination is carried out to obtain a core-shell structure with a uniform heterogenous interface, so that the iondiffusion kinetics can be improved and the electron conductivity can be improved, thereby improving the electrochemical performance of the batteries. Compared with the pure MoSe2, an SIB taking the MoSe2@CoSe2@C heterostructure as a cathode shows a remarkably improved specific capacity and excellent cycling stability and rate performance.

The invention relates to synthesis and property determination of a novel Schiff base ligand and complex and belongs to the field of coordination chemistry of inorganic chemistry, and the Schiff base complex can effectively realize green light emission. A molecular formula of a monomer is C19H20BrClF3NO2PtS, with the molecular weight of 693.87; PtL.DMSO is a 2,4,5-trifluoroaniline5-tert-butyl-3-bromosalicylaldehyde platinum complex and belongs to a monoclinic system, and a space group is P(2)1/n; lattice parameters are shown as follows: a=10.594(3)angstrom, b=8.767(3) angstrom, c=24.400(7) angstrom, alpha=gamma=90.00 degrees, and beta=95.451(4) degrees. According to the designed novel Schiff base platinum complex luminescent material, the maximum ultraviolet absorption wavelength is 442 nm, the maximum phosphorescent emission wavelength is 606 nm, and the decomposition temperature is 248 DEG C. The novel complex is convenient to synthesize, can be prepared by a simple instrument, has good heat stability and is not prone to decomposition at the high temperature.

The invention, which belongs to the technical field of energy material preparation, relates to a preparation method for growing a NiCo2S4 nanowire by using silk as a substrate to form a capacitor material. The specific preparation process comprises: growing a nickel-cobalt precursor on silk; carrying out hydrothermal vulcanization treatment on the obtained nickel-cobalt precursor to remove the silk and thus forming a hollow structure; and then carrying out oxidative calcination treatment to obtain a capacitor material having a 3D hollow structure. According to the invention, the spinous structure of the NiCo2S4 nanowire is kept well; a large specific surface area and more active sites are provided; the electron/ion in the electrolyte solution can be absorbed conveniently, so that the electrochemical performance of the material becomes excellent and stable. In addition, the hollow structure has the diameter of 8 to 9 nm and thus a convenient passage is provided for electron/ion transport, so that the reaction is carried out continuously and effectively. The prepared capacitor material having the excellent electrochemical performance and the outstanding cycle stability is a potentialmaterial and has broad application prospects.

The invention discloses a preparation method and application of three-dimensional multi-dimension porous crystal titanium carbide, relates to a preparation method and application of crystal titanium carbide, and aims to solve the problem that existing two-dimensional crystal titanium carbide is liable to stack, and especially has low mass specific capacitance when the mass is relatively large. Themethod comprises the following steps: I, preparing a two-dimensional layered titanium carbide nanosheet; II, calcining to obtain the three-dimensional multi-dimension porous crystal titanium carbide.The mass specific capacitance of the three-dimensional multi-dimension porous crystal titanium carbide prepared by the method is about 129F/g when the mass is 10mg. By adopting the preparation method, the three-dimensional multi-dimension porous crystal titanium carbide can be obtained.

The invention discloses a nickel doped cobaltosic oxide nanometer flower-shaped composite material, a preparation method and an application thereof. The method comprises the following steps: dissolving a nickel solution in ethyl alcohol, dissolving a cobalt salt into a mixed solution of the ethyl alcohol and water and performing ultrasonic treatment for a period of time; and then, mixing the two solutions, stirring, adding urea in the stirring process and stirring for a period of time, wherein the doped volume of nickel is 0.9%-2.3% by mole fraction; after uniformly stirring, transferring into a polytetrafluoroethylene reaction kettle for performing hydrothermal reaction; after completing the reaction, washing and drying, thereby acquiring a nickel doped cobaltosic oxide nanometer flower-shaped composite material. The nickel doped cobaltosic oxide nanometer flower-shaped composite material is high in product stability and stable in property, not only has excellent properties of cobaltosic oxide nanometer oxide but also can promote the conductivity. The preparation method is characterized by simple operation, low raw material cost, low reaction temperature, excellent electrochemical property and wide application in the fields of catalysis, sensing and energy storage.

The invention relates to the field of carbon quantum dot preparation, and particularly relates to a preparation method of silicon doping carbon quantum dots by adoption of a solvothermal method and applications thereof. The preparation method includes: adding hydroquinone into a stainless steel high-pressure reactor the liner of which is polytetrafluoroethylene; adding acetone according to a ratio that 5 mL of the acetone is added for per 0.97 g of the hydroquinone; adding dropwise silicon tetrachloride into the reactor, putting the sealed reactor in an air dry oven, heating at 150-220 DEG C for 1-5 h, cooling to room temperature, and concentrating and evaporating the liquid mixture in the reactor to dryness by adoption of a rotary evaporation manner to obtain the silicon doping carbon quantum dots. The preparation method is simple, efficient and mild, and is low in operation cost and simple in preparation process equipment. The prepared silicon doping carbon quantum dots can be applied in cell biological imaging.

The invention discloses a solid-phase catecholamine extraction functional composite material with magnetic 3D graphene nanoparticles as a core. A functional polymer, which is arranged on the surface of the solid-phase catecholamine extraction functional composite, is mainly synthesized from ethyl orthosilicate, trimethoxysilylpropanethiol and atropic acid, has a specific affinity site for catecholamines and is of a crosslinked network-like structure. Accordingly, the invention also provides a corresponding preparation method. The solid-phase extraction functional composite material is used foradsorption and dynamic extraction and separation of catecholamines such as trace adrenaline, which are illegally added in the pretreatment of cosmetic samples with complex matrix, and can be appliedto rapid separation and detection of catecholamines. The preparation method is simple, the cost is low, the recovery rate is high, the relative standard deviation is small, and the method has the characteristics of less use of organic solvents and convenient, fast and efficient solid phase extraction operation.