91results about How to "Electrochemically active" patented technology

The invention relates to a weather-resistant heavy-duty anticorrosive powder coating comprising the raw materials in parts by weight: 450-500 parts of hydrogenated bisphenol A epoxy resins, 50-99 parts of curing agents, 0.5-1 part of catalysts, 50-100 parts of zinc-rich fillers, 10-20 parts of self-repairing conductive macromolecule compounds, 190-240 parts of weather-resistant pigments and fillers and 30-50 parts of additives. A preparation method of the coating comprises the steps of putting the raw materials into a high-speed mixer, putting in an extruder after subjecting to dry mixing, carrying out fusion, mixing, cooling and preforming at an extrusion temperature of 80-90 DEG C, grinding by utilizing a grinder, grading, sieving and packaging to obtain finished products of the powder coating. The powder coating disclosed by the invention is mainly applied in the coating of outdoor heavy-duty anticorrosive environments, has excellent anticorrosive performance and weather-resistant performance and is an ideal heavy-duty anticorrosive coating capable of being used for outdoors. Proved by customer use and detection of relevant authoritative departments, the anticorrosive performance and the weather-resistant performance of the coating are excellent and can be completely up to indexes of imported similar products and certain indexes even exceed those of foreign products; the price of the coating is superior than that of the imported products; and therefore, the coating is well received by customers.

The invention relates a preparation method of a sulfur-containing composite anode for a lithium-sulfur battery, and a lithium-sulfur battery using the composite anode. According to the invention, a carbon fluoride additive with electrochemical activity is added in a process of sulfur-containing anode processing to prepare a composite sulfur-containing anode, so that the electrochemical activity of the sulfur-containing anode with a high sulfur content is improved, and the first electro-discharge specific energy of the lithium-sulfur battery is improved. The mass ratio of the active additive of the carbon fluoride to whole active substances is 20%-50%. The invention provides the preparation method of the sulfur-containing composite anode; on one side, since the electro-discharge product of the active additive of the carbon fluoride, the conductivity can be improved in the following electro-discharge process of a sulfur material, so that the sulfur-containing anode with a high sulfur content discharges normally; on the other side, carbon fluoride has electrochemical activity, the electro-discharge capacity isn't affected; the electro-discharge voltage of the anode is improved; and the first electro-discharge specific energy of a lithium-sulfur battery, especially a lithium-sulfur primary battery, is increased.

The invention discloses a surface modified positive electrode material and the preparation method and application thereof. The surface modified positive electrode material is formed by positive active material particles coated with nano Prussian blue compounds on the surface; the Prussian blue compounds are illustrated in formula 1; formula 1: AnMx[Fe(CN)6]y, wherein A is alkali metal, M is transition metal, the range of n, x and y is 0-2, and n and x are not equal to 0 at the same time. Compared with the oxide coating in the prior art, the positive electrode material disclosed by the invention is coated with Prussian blue compounds on the surface, therefore, the positive electrode material is less susceptible to be eroded by HF, and can block the electrolyte well, inhibit the transition metal to dissolve, improve the interfacial properties of the electrode material, and improve the cycle stability of the positive electrode material; moreover, the nano Prussian blue compounds have electrochemical activity and can improve the capacity of the positive electrode material. The positive electrode material disclosed by the invention is simple to prepare and easy to control, which lays a foundation for the preparation of high quality lithium ion batteries.

The invention relates to a battery cathode material and a preparation method thereof. The cathode material at least comprises the active material elemental silicon and reduced graphene oxide, and also includes polyaniline. Also, the elemental silicon has the double cladding layer of polyaniline and reduced graphene oxide. On the one hand, the special internal structure of polyaniline can well inhibit huge volume change of silicon particles in a charge-discharge process, thus improving the cycle performance of the battery; and on the other hand, both polyaniline and graphene have excellent electrical conductivity, and can significantly improve the charge-discharge capacity of the material. The invention also relates to a battery cathode and a battery containing the cathode material. The battery cathode and the battery provided by the invention have high charge-discharge capacity and good cycle performance, thus being suitable for various mobile electronic equipment.

The invention discloses a functionalized graphene hydrogel/functionalized carbon cloth composite fabric, a flexible all-solid-state supercapacitor integrated electrode and a preparation method. Functionalized graphene hydrogel is fixed in a functionalized carbon cloth frame through a one-step hydrothermal method, and then lignin/polyaniline composite hydrogel and the functionalized graphene hydrogel/functionalized carbon cloth composite fabric are prepared into the flexible all-solid-state supercapacitor integrated electrode by adopting an in-situ polymerization method. According to the method, the functionalized graphene hydrogel is used for filling gaps and macroscopic macropores in carbon cloth, and serves as a 3D conductive scaffold, so that the load of active substances in the electrode can be obviously increased, the interface resistance of the electrode is reduced, and the conductivity of the electrode is improved; and the prepared integrated electrode is assembled into a symmetric supercapacitor which shows excellent area capacitance, super-high energy density, high mechanical flexibility and cycling stability.

The invention discloses a preparation method of a Co-Al active material coated nickel-cobalt-aluminum ternary layered positive electrode material. The method comprises the steps: employing LDH as a coating material precursor, and coating the surface of an NCA ternary material precursor with the coating material precursor; mixing lithium salt with the NCA ternary material precursor, and performinghigh-temperature calcination to prepare the nickel-cobalt-aluminum ternary layered positive electrode material. According to the material, the outer layer of the NCA ternary material is coated with anLi-Co-AlO2 coating layer which has certain electrochemical activity, so the performance of the battery is improved under the condition that the capacity of the battery is not lost. A Co-Al lithium compound has a more stable lattice structure and has a positive effect on the cycling stability of the material. Besides, in the lattice structure of the compound, some defect vacancies can be reservedin the structure due to the mutual doping influence of the compound, so that electron conduction and ion diffusion are facilitated, and the rate capability of the battery is improved. The method is simple to operate, novel in strategy and obvious in effect.

The invention belongs to the field of organic light emission, in particular to an electro-chemical deposition preparation method of high-efficiency organic light emitting film, and an application of the light emitting film in preparing high-efficiency organic electroluminescent light emitting device. The light emitting film is prepared through an electro-chemical deposition method in an electrolytic cell in the following steps: electrolytic solution preparation, electro-chemical deposition, deposition film cleaning and drying and the like; the prepared light emitted film has the advantages of simple process, high light emission rate, small impact of electro-chemical doping on efficiency, easy control of area and size and adjustable light emission color. The light emitting film can be used as a light emission layer in the organic electroluminescent light emitting device, to prepare single-layer or multi-layer high-efficiency organic electroluminescent light emitting devices and obtain dark blue light emission devices; the lumen efficiency of the devices reaches 4.436cd/A which reaches or exceeds the efficiency level of most parts prepared through the traditional part processing technologies.

The invention discloses a technical method for improving initial efficiency of a lithium ion total battery. Li<3>V<2>(PO<4>)<3> is added to a positive electrode active material based on a certain ratio to obtain a positive electrode plate; and an electrode is discharged by metal lithium, and the voltage lower limit is controlled to be 1.2V to enable the Li<3>V<2>(PO<4>)<3> material to be embeddedwith lithium to obtain Li<3+x>V<2>(PO<4>)<3> (x is greater than or equal to 1 and less than or equal to 2). The positive electrode plate in an empty electric state and a negative electrode with low initial efficiency are assembled to form a total battery; the charging and discharging voltage range is controlled; in the initial charging process, x-unit active lithium de-intercalated from the Li<3+x>V<2>(PO<4>)<3> is embedded into the negative electrode; in re-discharging, the voltage lower limit is controlled to be 2V or above to enable the x-unit active lithium not to be embedded in the positive electrode, so that active lithium loss caused by the secondary reaction of the initial charging negative electrode can be overcome, thereby improving the initial efficiency of the lithium ion totalbattery; the Li<3>V<2>(PO<4>)<3> has electrochemical performance in the normal total battery charging-discharging range, without influencing capacity utilization of the positive electrode material; and by virtue of the technical method, the initial efficiency and the cycle performance of the lithium ion total battery are improved effectively.

The invention discloses a high-specific capacity lithium-sulfur secondary battery composite cathode and a preparation method thereof. The method comprises the following steps: (1) weighing elemental sulfur, copper powder, a conductive agent and a binder, and mixing the raw materials to prepare a sulfur cathode; and (2) putting the sulfur cathode prepared in the step (1) into a vacuum oven for drying at the temperature of 40-80 DEG C for 24-72 hours, so as to obtain the lithium-sulfur secondary battery composite cathode containing the elemental sulfur and copper sulphate. According to the composite cathode disclosed by the invention, the first discharge specific capacity reaches 1400mAh/g-S; the discharge capacity is kept at 997.8mAh/g-S after 30 cycles; and the lithium-sulfur secondary battery composite cathode also displays relatively good cycling stability. According to the preparation method disclosed by the invention, the manufacturing process is simplified; the cost is reduced; and the copper sulphate generated by a chemical method has relatively high reaction activity, and is conducive to improvement of the discharge capacity of a lithium-sulfur battery.

The invention discloses a coating method of a high-nickel ternary material. The coating method comprises the following steps of S1, primary sintering, wherein after a high-nickel ternary precursor ismixed with a lithium hydroxide raw material according to a ratio, the mixture is subjected to heat preservation for 5-12 h in the range of 750-890 DEG C under the oxygen introduction condition, and after the temperature is reduced to 400 DEG C or below under the oxygen introduction condition, the mixture is naturally cooled and subjected to coarse crushing to obtain a once-sintered high-nickel ternary material; S2, coating, wherein superfine electrolytic manganese dioxide serves as a coating agent and is fully mixed with the once-sintered product in S1; moisture preservation is carried out onthe mixed material at 650-750 DEG C in the air atmosphere, and a high-nickel ternary material finished product is obtained. A brand new coating mode is utilized, residual alkali on the surface of thematerial is reduced, and high-temperature deoxygenization is inhibited, so that the electrochemical performance and process processing performance of a nickel-cobalt lithium manganate material are improved.

The invention discloses a method for preparing iron-containing hydrotalcite-like compound by utilizing prussian blue pigment and divalent metal salt, and belongs to the technical field of preparation processes of inorganic nanometer materials. The method comprises the following steps of selecting the prussian blue as a raw material, mixing and dissolving with organic acid according to the constant proportion, and carrying out a coprecipitation reaction on divalent metal ions under an alkaline environment by utilizing Fe<3+> ions released by the prussian blue in the solution to prepare Fe<3+>-containing hydrotalcite-like compound, wherein grain size of the prepared Fe<3+>-containing hydrotalcite-like compound is uniformly dispersed in a nanometer level. According to the method disclosed by the invention, the prepared iron-containing hydrotalcite-like compound has the electrochemical property of the prussian blue, also has the electrochemical activity of the hydrotalcite-like compound, and has remarkably improved electrochemical property compared with the single-element hydrotalcite; and when the prepared iron-containing hydrotalcite-like compound is taken as a capacitor material, the cycle performance of the iron-containing hydrotalcite-like compound is subjected to a charge-discharge test, so that the iron-containing hydrotalcite-like compound has excellent reversible discharge capacity and stable cycle performance, and has large application potentiality in the electrochemical field.

The invention discloses a negative electrode material of a water-based ion battery. The negative electrode material of the water-based ion battery comprises a negative electrode active material, a conductive agent and a binder, wherein the negative electrode active material comprises polyimide. The binder contains sodium carboxymethyl cellulose and butadiene styrene rubber. According to the water-based ion battery negative electrode material, an electrode material is prepared from a binder system of sodium carboxymethyl cellulose (CMC) and styrene butadiene rubber (SBR) according to a certainratio in a water-based battery taking a naphthalene ring-containing polyimide material as a negative electrode for the first time, and matches a lithium manganate positive electrode, so that excellentwater-based lithium ion battery performance is obtained.

The invention provides a novel covalent organic framework material, which is obtained by reaction of 2,3,5,6-tetraamino-1,4-benzoquinone and cyclohexanehexone or a hydrate thereof. The invention also provides a corresponding preparation method. The invention further provides application of the covalent organic framework material in a lithium ion battery, especially as a positive electrode material. The covalent organic framework material is in a two-dimensional lamellar shape, and has a large number of conjugated carbonyl groups and carbon-nitrogen double bonds with electrochemical activity, so that the lithium ion battery prepared from the covalent organic framework material has relatively high energy density.

Relating to the field of analytical chemistry detection, the invention provides a carbon paste electrode for detection of hydroquinone, and a preparation and detection method thereof. The carbon paste electrode for detection of hydroquinone comprises a carbon paste, an electrode tube, an electrode lead wire, and a graphene oxide coating. The electrode tube has a first end and a second end opposite in positions, the carbon paste is pressed into the electrode tube from the first end of the electrode tube, the electrode lead wire contacts the carbon paste, and is led out from the second end of the electrode tube, and the graphene oxide layer is formed on the surface of the first end. The carbon paste electrode modifies graphene oxide to a carbon paste electrode substrate, and graphene oxide is an excellent modifier and has good electrocatalytic response to hydroquinone. Also the carbon paste electrode has the advantages of simple making, long service cycle, good stability, high sensitivity, low cost, easy preparation and excellent reproducibility, etc., and can be used for determination of hydroquinone in water samples. In addition, the invention also relates to a preparation method of the carbon paste electrode and a detection method of hydroquinone.

The invention relates to a surface-doped rich lithium cathode material and a preparation method thereof. The xLi2MnO3. (1-x)Li(Ni0.5Mn0.5)O2 is used as a matrix, the surface layer of the matrix is doped with Rh3+, and the surface layer doped with the Rh3+ can be represented by xLi2MnO3. (1-x)LiNinMnmRh1-m-n O2, wherein 0<x<1, 0<n<=0.5, and m<=0.5. By adopting the surface doping mode, the side reaction between a cathode material and electrolyte is lowered, and therefore the rate capacity of the cathode material is guaranteed, and the cycle performance of the cathode material is improved.

The invention provides an electrolyte for a metal battery and the metal battery, and belongs to the technical field of batteries. The electrolyte for the metal battery, provided by the invention, comprises a liquid electrolyte and an electrolyte additive added into the liquid electrolyte, wherein the electrolyte additive is any one or more of indium salt, tin salt, bismuth salt and germanium salt. Because metals such as indium, tin, bismuth and the like have higher electrode potential than lithium, the metal ions can be reduced on the surface of the negative electrode by the lithium, so that an SEI film containing metal components is formed on the surface of the lithium negative electrode in situ. In the circulation process, metal ions in the electrolyte have electrochemical activity, stability of a metal protective layer on the surface of the lithium negative electrode is promoted, the metal can store lithium in an alloy forming mode, and meanwhile, the formed alloy can reduce diffusion barriers during lithium deposition, promote rapid migration of the lithium ions and inhibit growth of lithium dendrites; therefore, the cycling stability of the lithium metal negative electrode is further improved.

The invention discloses a composite positive electrode material of a lithium ion battery and a preparation method for the composite positive electrode material, belongs to a chemical power supply material and a preparation method therefor, solves the problem that the existing lithium-rich manganese-based material cladding layer has no electrochemical activity, and by providing a new approach for preparing the cladding layer, solves the problem of degradation of specific capacity and initial coulombic efficiency caused by the side reaction of the lithium-rich manganese-based material. The composite positive electrode material disclosed by the invention consists of the lithium-rich manganese-based material and an FeF<3> cladding layer which coats the exterior of the lithium-rich manganese-based material; the preparation method comprises the following steps of adding CTAB into n-hexanol, heating and stirring, and dividing into three parts averagely; adding Fe(NO<3>)<3>, an NH<4>F water solution and a lithium-rich manganese-based material water phase turbid liquid separately, and mixing the obtained three parts of solutions, standing and reserving and taking a lower water layer and solid, performing centrifuging, separating and ethyl alcohol washing, and solid purifying; and finally performing vacuum drying. The composite material provided by the invention has relatively high initial coulombic efficiency and specific capacity; and by providing an effective approach of material cladding, the FeF<3> nanometer layer can be uniformly dispersed on the surface of the lithium-rich manganese-based material to obtain the uniform cladding layer.

The invention discloses a preparation method of a coated multilayer precursor. The method at least comprises the following steps of obtaining a core precursor; and coating the core precursor with a shell precursor by a dry mixing, wet ball milling or co-precipitation method. The method disclosed by the invention has the advantages of simple operation and wide application range.

The invention relates to a lithium molybdate coated lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The structure of the lithium molybdate coated lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based layered oxide inner core and a Li2MoO4 coating layer, and a Mo6+ concentration gradient transition layer exists between the lithium-rich manganese-based layered oxide inner core and the Li2MoO4 coating layer; in the transition layer, the concentration of Mo6+ is gradually reduced from one side of the coating layer to one side of the inner core, and the thickness of the transition layer is 0.1-10 nm; the chemical expression of the Li2MoO4 coated lithium-rich manganese-based layered oxide positive electrode material is xLi[Li0.33Mn0.67]O2.(1-x)LiMO2@Li2MoO4, 0<x<1, wherein M at least comprises two elements of Mn, Ni, Co, Al and Mg.

The invention relates to the technical field of nano-grade material and microstructure, and discloses a method for uniformly growing a nanostructured material on a uniform chemically nickel-plated silicon microchannel substrate structure. The method comprises the following steps: silicon microchannels with a needed shape and separated from a silicon substrate are cut with laser; a uniform nickel conductive layer is grown on the surfaces of the microchannels with a chemical nickel-plating method; a nickel deposition time is adjusted, such that the resistance of the nickel-plated silicon microchannels is lower than 2ohm; a layer of nanostructure is grown on the surfaces of the nickel-plated microchannels with a hydrothermal method, wherein the nanostructure is composed of a composite metal oxide CoMoO4. According to the invention, the nanostructure is grown on the surfaces and insides of the nickel-plated silicon microchannels with micron-grade pore sizes with the hydrothermal method, such that the uniformity and stability of the structure are improved, and a problem of severe microchannel blockage caused by physically delivering materials to the inner sides of the microchannels is avoided. The material has good electrochemical activity, and has certain potential to be used in the field of new energy.

The invention provides a lithium battery composite electrode pole piece with high rate capability and high cycle performance, and belongs to the technical field of secondary ion lithium batteries. Theinvention provides a positive electrode pole piece or a negative electrode pole piece of a lithium battery. The positive electrode pole piece or the negative electrode pole piece comprises a currentcollector and functional slurry coated on the surface of the current collector, wherein the functional slurry is obtained by uniformly mixing a positive electrode active material or a negative electrode active material, a conductive agent and a polymer solution, and a polymer in the polymer solution is degradable bio-based polyester. The composite electrode obtained by the invention can realize anefficient and uniform electron transmission network and ion transmission channel, and effective coating and protection of active particles, thereby having excellent cycle performance and rate capability.