240results about How to "Lower transfer resistance" patented technology

The invention relates to a low-temperature electrolyte of a lithium iron phosphate battery. The low-temperature electrolyte includes the following solvents of, by volume, 30%-45% of carbonic ester solvent, 50%-65% of carboxylic ester solvent and 4%-10% of additive. The solvents contain solute lithium, the lithium is LiPF6 or a combination of the LiPF6 and LiBF4, and the concentration of the lithium is 0.8-1.4mol/L. The low-temperature electrolyte is a nonaqueous electrolyte, through optimization of kinds and proportioning combination of the solvents of the electrolyte, low-viscosity carbonic ester and low-melting-point carboxylic ester are selected and used, the freezing point at low temperature is lowered, and low-temperature conductivity is increased. According to the low-temperature electrolyte, the lithium of the electrolyte is optimized, the low-temperature additive is selected preferably, normal-temperature circulation ratio performance of the electrolyte is maintained, and meanwhile, the low-temperature capacity retention ratio of the lithium iron phosphate battery and the ratio performance of the lithium iron phosphate battery are improved. The commercial application requirements of the electrolyte can be met, the low-temperature performance of the electrolyte is improved particularly, and therefore the electrolyte is suitable for aerospace and plateau alpine environment.

The invention discloses a preparation method and application of a carbon intercalation layer V2O3 nanometer material. The preparation method comprises the following steps of (1) adding vanadium pentoxide powder into an organic amine liquid, and uniformly stirring and mixing the powder; (2) transferring a mixed liquid to a reaction kettle for hydrothermal reaction; and (3) placing the obtained hybrid precursor in a furnace after drying, introducing an inert gas for carbonization to obtain a V2O3/C hybrid nanometer material. The V2O3/C hybrid nanometer material prepared by the method is uniform in morphology, and a carbon layer can be effectively dispersed in a nanometer substrate in the material. When the material is applied to a lithium ion battery or sodium ion battery negative electrode, the rate performance of a metal oxide used as an electrode material can be greatly improved, the volume energy density of the battery is improved, and the material has relatively large application prospect.

The present invention provides a crystalline silicon solar cell and a preparation method thereof. The crystalline silicon solar cell comprises: an N-type silicon substrate; a tunneling oxide layer formed on the back surface of the N-type silicon substrate; and a polysilicon layer formed on the tunneling oxide layer, wherein the polysilicon layer comprises alternatively distributed N+ polysilicon areas and P+ polysilicon areas, and a space is arranged between each neighboring N+ polysilicon area and P+ polysilicon area. The tunneling oxide layer, the N+ polysilicon areas and the P+ polysiliconareas form a passivation contact structure on the back surface of the N-type silicon substrate. According to the crystalline silicon solar cell and the preparation method thereof, the recombination rate of the back surface of a battery is effectively reduced, and the open circuit voltage of the battery is improved. Compared with the conventional back knot and back contact solar cells, the doping process of the front surface is saved, the battery preparation process is simplified, the absorption loss of light is reduced, and thus the solar cell can facilitate the improvement of battery performance and the reduction of cost.

The invention belongs to the field of nanomaterials, and discloses a nickel-cobalt bimetallic phosphide electrocatalyst as well as a synthesis method and an application thereof. The Prussian blue analogue precursor synthesized through simple aging reaction is further subjected to low-temperature phosphating reaction, and a NiCoP multi-hollow porous nanocube electrocatalyst is obtained. The seriesof bimetallic phosphides have lower charge transfer resistance and reaction barrier for oxygen evolution reaction, and have superior performance in electrocatalytic oxygen evolution reaction. Besides,the catalyst is low in cost and convenient to operate, adopts a simple process and has superior catalytic performance, and basic application research is provided for the materials in the field of electrocatalysis.

The invention discloses a solid-phase preparation method of an NCM811-type high-nickel ternary positive electrode material. The preparation method comprises the process steps of raw material mixing, primary sintering performed in three segments, composite coating agent coating, secondary sintering and processing after sintering. According to relevant performance test, the composite coating methodof doping nanometer Al2O3 and AlF3 or Al2O3 and LiF into a lithium ion battery positive electrode is employed, primary sintering is performed in three segments, sintering and oxygen introduction are performed, the capacity attenuation of the material can be effectively reduced under the condition that favorable reversible capacity of the material is maintained, the cycle lifetime is prolonged, andthe comprehensive performance of the lithium ion battery positive electrode material is improved.

The invention discloses a charcoal-coated metal fluoride nano material with a core-shell structure, a preparation method and application of the nano material in the field of lithium ion battery positive electrodes. The nano material is of a core-shell structure; the shell layer is charcoal; the core layer is metal fluoride; the nano material has high specific capacity and good cyclic stability by being taken as the positive electrode material of a lithium ion battery. The nano material with the core-shell structure can be prepared through the processes of mixing, pyrolysis and solvent washing of a raw material metal compound and a fluorine-containing compound, has the characteristics of abundant source of raw material, simple process, low material preparation cost, high purity, wide metal choice range and the like, and facilitates large-scale production.

The invention provides a buffer layer for a sulfide solid-state battery. The buffer layer comprises a polymer material and ethylene carbonate, and is formed in situ on an electrode plate through a buffer layer solution; and due to the existence of a polymer, poor physical contact between an electrode and an electrolyte caused by volume deformation of a positive electrode material in a charging/discharging process can be improved. The buffer layer is existent between the positive electrode and the solid electrolyte of the solid-state battery and between the negative electrode and the solid-state electrolyte, so that the solid-solid interface impedance can be reduced; and meanwhile, good ionic conductivity of the buffer layer can improve the lithium ion transmission capacity. The sulfide composite positive electrode in the solid-state battery provided by the invention contains the polymer material, and the existence of the polymer can improve the poor physical contact between the electrode and the electrolyte caused by the volume deformation of the positive electrode material in the charging/discharging process; and meanwhile, the solid-state battery contains the buffer layer, so that the solid-state battery has low interface resistance and high ionic conductivity, and is excellent in capacity and cycling performance.

The present invention relates to the technical field of display, and discloses a substrate, a making method of the substrate and a display device adopting the substrate. The substrate comprises a signal line and a grounding route. The grounding route is used for discharging static electricity on the signal line; by making a plurality of hollowed areas on the grounding route, line widths of the grounding route in the corresponding areas can be reduced, an adhesion force of the grounding route is increased and the grounding route is prevented from being peeled off. Meanwhile, the grounding route also can be guaranteed to have a certain line width, transmission resistance is reduced, and the static electricity accumulated on the signal line is rapidly discharged, thereby ensuring substrate performance and improving display quality of the display device.

The invention provides preparation of a carnation-shaped p-n heterojunction copper sulfide nanometer material, and belongs to the technical field of nanometer materials. The preparation includes the steps that melamine is used as a raw material, carbon-doped graphene carbon nitrogen C-g-C3N4(CCN) is synthesized through hydro-thermal treatment and high-temperature calcination, and the carbon-doped graphene carbon nitrogen, copper chloride dihydrate and thiourea are further subjected to a hydrothermal reaction to synthesize a CCN-CuS p-n heterojunction; the p-n heterostructure reduces charge transfer resistance, enables photoinduced charges to be effectively separated and can effectively improve activity of photocatalyst. It is indicated through experiments that the prepared CCN-CuS p-n heterojunction nanometer material shows excellent visible-light catalytic activity and good cycling stability, and the degradation rate of rhodamin B can reach 92.6%. Therefore, the nanometer material can be used for degradation treatment on organic dyestuff waste water.

The invention provides a method for preparing a MnO2/carbon composite material for a super-capacitor. The method includes the steps of step one, dissolving glucose or sucrose or fructose in deionized water, stirring until a settled solution is obtained, transferring the settled solution into a hydrothermal reaction kettle, performing centrifugation, water washing, alcohol washing and drying on an obtained polymeric pecursor solution to prepare monodisperse carbon spheres; step two, taking the monodisperse carbon spheres, performing heat treatment on the monodisperse carbon spheres in a NaOH solution, then performing centrifugation, water washing and alcohol washing on a mixture solution three times, conducting drying, and performing calcination treatment in vacuum or inert atmosphere; step three, using the carbon spheres experiencing modified treatment in the step two as a template, placing the template in a KMnO4 aqueous solution, stirring and aging at the room temperature, obtaining a sediment, performing centrifugation, water washing and alcohol washing on the sediment, performing drying in a vacuum oven, and obtaining CS@MnO2 coated powder. Obtained MnO2/carbon sphere composite powder is of a core-shell structure, the specific surface area of the powder can reach more than 778m<2>/g, the specific capacity of the powder can reach more than 439F/g, charge transfer resistance is lower than 2.1 omega, and the powder is a novel super-capacitor electrode material.

The invention discloses a method for preparing the anode of a microorganism fuel battery with a graphene and ferrous disulfide compound, and belongs to the field of environments, materials and energy. The method comprises the following steps: (1) gradually dropping a ferric trichloride and thiourea solution into a graphene oxide dispersion in a reaction kettle one droplet by one droplet, uniformly stirring, sealing the reaction kettle, and performing hydrothermal reaction for 12-24 hours within 140-200 DEG C so as to obtain a hydrogel sample; (2) washing the hydrogel sample for times with deionized water, performing freeze-drying, and crushing so as to obtain a nano powder of the graphene and ferrous disulfide compound; (3) mixing the nano powder with a 5% nafion solution, isopropanol and deionized water, uniformly oscillating, coating carbon cloth with the solution, fixing the carbon cloth with a fixing part, and drying the carbon cloth in air, so as to obtain the anode. The method has the advantages that the synthesis steps are very simple, obtained particles are uniform in morphology, graphene lamellas are overlapped to form a well-developed porous structure, good electrochemical properties and biocompatibility can be achieved, and the anode of the microorganism fuel battery has very good properties.

A difunctional negative electrode for an all-vanadium redox energy storage battery negative electrode includes a carbon matrix material and a Bi-containing electro-catalyst modifying the surface of the carbon matrix material. The negative electrode is suitable for being used as the negative electrode of the all-vanadium redox energy storage battery, can greatly improve the electrocatalytic activity and electrochemical reversibility of an electrode material on a V<2+>/V<3+> redox reaction, and decreases the charge transfer resistance; and the negative electrode has high hydrogen evolution overpotential, can inhibit a hydrogen evolution reaction, and prolongs the work life of the battery. The difunctional negative electrode improves the voltage efficiency and energy efficiency of the all-vanadium redox energy storage battery, so the working current density of the battery is improved, and the weight, the size and the cost of the battery with same output power are greatly reduced.

The invention discloses preparation of a ZIF-67/bismuth vanadate composite. 2 -methylimidazole and CO (NO3) 2.6H2O are dissolved in N, N-dimethylformamide-distil water, and a BiVO4 film is soaked in the mixture for one hour; and then the BiVO4 film is completely washed with the distilled water and ethanol and dried to obtain a final product. According to the preparation of a ZIF-67/bismuth vanadate composite, ZIF-67 is successfully is loaded on the surface of BiVO4 through an in-situ deposition method, a stable ZIF-67/ BiVO4 thin film material is formed. Under high bias, the ZIF-67/BiVO4 composites have higher photocurrent than a pure/BiVO4 composite; and meanwhile, the introduction of ZIF-67 well prolongs the life of carriers and further improves the photoelectric catalytic performance ofthe BiVO4. Through a photocurrent corresponding test and photoelectric injection efficiency calculation, a composite photoelectrode is proved to have excellent photoelectric catalytic performance, can be used in photo anode materials, and can effectively improve hydrogen production efficiency.

The invention discloses a modified nickel oxide negative material. Nickel oxide with a hollow structure is taken as a matrix and is doped with metal elements (including one or more of lithium, sodium and potassium). A preparation method of the modified nickel oxide negative material comprises the following steps: dissolving metal element nitrate and nickel nitrate in water for mixing uniformly to obtain a mixed liquor, and then performing spray pyrolysis treatment on the obtained mixed liquor, thereby obtaining the modified nickel oxide negative material, wherein a metal element is one or more of lithium, sodium and potassium, and the molar concentration ratio of metal ions and nickel ions in the mixed liquor is equal to (1:100)-(10:100). The nickel oxide negative material has a hollow spherical feature, so that diffusion paths of lithium ions are reduced, and the volume change in a circulating process is alleviated to a certain degree. As nickel oxide is doped with the metal elements including lithium, sodium and potassium, the conductivity of the material is improved, the charge transfer impedance is lowered, and the electrochemical performance of a battery is improved.

The invention discloses a lithium ion battery negative electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: preparing Cu2O nano-cubes from copper sulfate (CuSO4), trisodium citrate, polyvinylpyrrolidone, sodium hydroxide and ascorbic acid, and coating the surface of the Cu2O with nano-TiO2 through an isopropyl titanate hydrolysis technology in order to obtain a nano-TiO2 coated Cu2O nano-cube material. The preparation method of the material has the advantages of simplicity, mild reaction conditions, no pollution to the environment, low cost and mass production. The nano-TiO2 coated Cu2O nano-cubes have remarkably improved cycle stability and charge-discharge performance as a lithium ion battery negative electrode material, and is suitable for the industrial application of the lithium ion batteries.

The invention provides a transition metal sulfide composite electrode material and a preparation method thereof and a fully-solid-state lithium battery. The composite electrode material includes a transition metal sulfide and a solid electrolyte coating the transition metal sulfide; the transition metal sulfide is selected from one or more of iron-based polysulfide, cobalt-based polysulfide, nickel-based polysulfide and vanadium-based polysulfide; the solid electrolyte is selected from Li7P3S11, Li3PS4, Li10GeP2S12, 70% Li2S.29% P2S5.1% Li3PO4, 75% Li2S.24% P2S5.1% P2O5 and 80% Li2S.20% P2S5.The fully-solid-state lithium battery prepared from the composite electrode material has good cycle performance, high energy density and high rate performance.

The invention discloses a manganese dioxide/copper foam sodium ion battery self-supporting negative pole preparation method. The method comprises the steps that flake copper foam is treated with absolute ethyl alcohol, washed to be clean and dried, and an electrode substrate is obtained; a manganese sulfate solution of a certain concentration is prepared; the obtained solution and a copper foam sheet are put into a hydrothermal reaction kettle, heating and heat preservation are conducted for a certain time through hydrothermal induction heating equipment, and then the manganese dioxide/copper foam sodium ion battery self-supporting negative pole with a three-dimensional porous communicating frame-shaped structure is obtained.

The invention provides a method for preparing a bimetal/organic framework/bismuth vanadate composite photoanode material. A metal framework NiCo-MOFs with a three-dimensional rhombic tetragonal structure is formed by a hydrothermal process in a mixed solution of N,N-dimethylformamide, anhydrous ethanol and distilled water with CoCl2.6H2O and NiCl2.6H2O as raw materials, phthalic acid as a ligand framework and a BiVO4 electrode as a matrix, and the metal framework NiCo-MOFs is loaded on a BiVO4 film to obtain the photoanode material NiCo-MOFs/BiVO4. The coupling effect of the bimetal center promotes the transfer of electrons from the organic ligand to the metal center in order to promote charge separation. Additionally, the three-dimensional rhombic tetragonal metal framework structure andthe sufficiently large contact area make lights effectively captured, the charge transfer resistance reduced and the rapid migration of carriers accelerated, so the recombination of electron hole pairs is inhibited, thereby the electrochemical performances of BiVO4 are effectively improved.

The invention relates to the field of lithium-sulphur batteries, and provides a lithium-sulphur battery diaphragm preparation method. The lithium-sulphur battery diaphragm preparation method comprises the four steps of: simultaneously adding chemical staple fibre and separated and wrinkled micro-fibre into a solvent; after free deposition of matrix slurry, coating uniformly dispersed nano-cellulose slurry on the surface of a matrix; after nano-cellulose is formed, coating conductive polymer and nano-cellulose composite slurry on the surface, finally, squeezing, and drying to form the diaphragm; and, hot pressing and cutting the diaphragm. According to the lithium-sulphur battery diaphragm preparation method provided by the invention, the lithium-sulphur battery diaphragm can be obtained through the steps S1-S4; and thus, the coulombic efficiency of the lithium-sulphur battery can be improved. The invention provides a lithium-sulphur battery diaphragm comprising an intermediate layer, a basal layer and a surface layer. The lithium-sulphur battery diaphragm provided by the invention can store a lot of electrolyte; and thus, the battery cycle capacity is improved. The invention provides a lithium-sulphur battery comprising the diaphragm. The performance of the lithium-sulphur battery provided by the invention is greatly improved.

The invention relates to an anode material for a lithium ion battery as well as a preparation method and application of the anode material. The anode material is an LMP/PEG-PTh composite material, wherein the mass percentage of PTh in the LMP/PEG-PTh composite material is 1%-15%. The preparation method of the anode material comprises the following steps: with an LMP material as a kernel, attaching PEG to the surface of the LMP kernel, so as to obtain an LMP/PEG composite material; and depositing a conductive polymer PTh on the surface of the LMP/PEG composite material, so as to obtain the LMP/PEG-PTh composite material. According to the invention, the PEG can form a cladding layer on the surface of the LMP so as to restrain the dissolving of manganese and is a good solid polymer electrolyte matrix capable of promoting the transmission of lithium ions; and by utilizing a PTh cladding layer with relatively high conductivity, the load transfer resistance among LMP interfaces can be reduced, the surface migration rates of the lithium ions and electrons can be increased, and therefore, the rate capability of an electrode is improved.