197results about How to "Increase migration rate" patented technology

The invention belongs to the field of organic photoelectric materials, and discloses an electroluminescent material and a preparation method and application thereof. The structure of the electroluminescent material is as shown in a formula I: # imgabs0 #. According to the electroluminescent material compound provided by the invention, on the basis of a 9-methyl-9-phenylfluorene group, triarylamine and an aromatic ring are connected through 2 and 4 sites, when the triarylamine group is substituted by aryl, the energy level is relatively low, carrier migration localization is avoided, and a hole transport energy barrier can be reduced, so that the migration rate and the luminous efficiency are improved; triarylamine has excellent hole transport performance, a triarylamine material is used as a light-emitting auxiliary layer, a group with a high triplet state energy level is introduced, the energy range between energy levels can be reduced, and the service life of the device is greatly prolonged.

The invention relates to the technical field of energy materials, and discloses a self-assembled low-crystallization nanoflower-shaped polyoxometallate catalyst and a preparation method and application thereof.The preparation method comprises the steps that firstly, cobalt nitrate hexahydrate, iron nitrate nonahydrate, CH4N2O and Finke Co are used as raw materials, Finke Co and Fe < 3 + > are grown on nickel foam in situ, then the Finke Co and Fe < 3 + > react with ZIF-67 (Co), and a Finke Co-FeCoNi precursor with a stable structure is prepared; finally, the precursor is subjected to vulcanization, and the nano flower-shaped polyoxometallate catalyst Finke Co-FeCoNi / S is obtained. According to the preparation method, Finke Co is added, so that the crystallinity of the catalyst material is reduced, the catalyst material is assembled into a nanoflower-shaped structure, the low crystallinity can provide more coordinated unsaturated sites and improve the conductivity, and the nanoflower-shaped form exposes more defect sites, so that the reaction contact area is increased, and the catalytic activity is improved.

The invention relates to the field of battery materials, and discloses a diaphragm and a lithium ion secondary battery comprising the same. The diaphragm comprises a base membrane and ceramic strip layers, wherein the ceramic strip layers are positioned on at least one side surface of the base membrane and are arranged in parallel at intervals; the width of the ceramic strip layer is A, the puncture strength of the base film is N, and the relation between A and N meets the condition that N / A is larger than or equal to 1gf / mu m and smaller than or equal to 17gf / mu m. According to the diaphragm provided by the invention, the ceramic strip layers which are arranged in parallel at intervals are formed on at least one surface of the base membrane, and parameters of the whole diaphragm are optimally set, so that the migration rate of active ions in an electrolyte in the diaphragm is effectively improved, the available discharge depth of a battery is further improved, the charge-discharge capability of the battery is improved, and the service life of the battery is prolonged. And the level of the minimum SOC of effective power supply of the battery is reduced, and the application performance of the lithium ion battery is improved.

The invention belongs to the technical field of civil engineering materials, and provides an early-strength high-fluidity geopolymer grouting material and a preparation method thereof. The method comprises the following steps: firstly, carrying out heat treatment and chemical regulation on fly ash and granulated blast furnace slag to generate a pre-reaction phase with high reaction activity, and improving the alkali excitation reaction efficiency; then, by preparing a lubricating particle dispersion liquid and utilizing the synergistic effect of a silane coupling agent and interface lubricating particles, the uniform dispersity of the particles is enhanced; by adding the ionic liquid and the functionalized acylamino polymer, the dissolution and activation of the aluminosilicate are accelerated by utilizing the high polarity, the ion shielding effect and the dissolution enhancing performance of the ionic liquid; meanwhile, the amido polymer inhibits particle aggregation and stabilizes the particle dispersion state through the adsorption effect, the amido polymer and the amido polymer cooperate to form a lubricating layer in the slurry, reduce the viscosity of the slurry and improve the fluidity, and the early strength of the material is further improved by accelerating the generation of a gel phase.

The invention provides a preparation method of a high-rate and high-sphericity lithium iron phosphate positive electrode material, which comprises the following steps: weighing iron phosphate and a lithium source according to a certain proportion, dispersing in pure water, and mixing and sanding to obtain slurry A; under a stirring condition, adding a small amount of fluorine source into the slurry A to obtain lithium fluoride doped slurry B; and under the stirring condition, adding an organic carbon source into the slurry B to prepare an electrostatic spinning solution C, and drying and calcining at high temperature to obtain the high-rate and high-sphericity lithium iron phosphate composite positive electrode material. The preparation method comprises the following steps: synthesizing a lithium fluoride doped stock solution through an in-situ reaction of a fluorine source and a lithium source, and preparing a uniformly doped precursor through electrostatic spinning; the generated lithium fluoride is used as a fluxing agent to promote the formation of high-sphericity lithium iron phosphate in the sintering process; and meanwhile, the doping of fluorine ions weakens the interaction between Li and O, so that the lithium ions can be separated / embedded in a bulk phase during charging and discharging, and the conductive carbon layer is rich in lithium fluoride, so that the migration efficiency of the lithium ions at a positive electrode / electrolyte interface is improved.

The invention belongs to the technical field of secondary batteries, and discloses a negative pole piece, a preparation method of the negative pole piece and a quick-charge type lithium ion battery. The negative electrode plate comprises a negative electrode current collector, a bottom coating layer coated on the surface of the negative electrode current collector and an upper coating layer coated on the surface of the bottom coating layer, the active substance in the material of the bottom coating and the active substance in the material of the upper coating are respectively and independently graphite negative electrode materials, and the OI value of the active substance in the material of the bottom coating and the OI value of the active substance in the material of the upper coating are respectively and independently smaller than or equal to 15. Graphite with different OI values is adopted for layered coating, the ion impedance of the pole piece is reduced, the rate capability of the pole piece is improved, and the problem that the energy density and the rate capability cannot be considered at the same time due to insufficient electrolyte wettability, insufficient dynamic performance and poor conductivity caused by thickening of the negative pole piece is solved.

The invention discloses an organic photoelectric detector based on a quantum dot active layer processing strategy and a preparation method thereof, and belongs to the field of photoelectric detection. According to the detector, an aluminum-based template with a nanometer hole structure is introduced, the aluminum-based template is pressed on a quantum dot layer in a covering mode through a certain pressure so that the surface appearance of the quantum dot layer can be changed, the contact area between the quantum dot layer and organic matter can be increased, and the detector structurally comprises a glass substrate layer, an ITO electrode layer, a ZnO layer, a CQD layer, a P3HT layer, a MoO3 layer and an Ag electrode layer from bottom to top. According to the invention, a plurality of holes are pressed in the surface of the quantum dot layer from outside to inside, so that the P3HT layer can enter the holes in the surface of the quantum dot layer, thereby increasing the contact area between the quantum dot layer and an organic matter, accelerating the separation of photon-generated carriers, and improving the response speed of a photoelectric device.

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a coated ternary positive electrode material, a preparation method thereof and a lithium ion battery. The coated ternary positive electrode material comprises a substrate and a coating layer on the surface of the substrate, the matrix is a ternary positive electrode material LiNi < x > Co < y > Mn < 1-x-y > O < 2 >, 0, ygt; 0, 1-x-ygt; 0; and the coating layer is a compound of graphene and WNb12O33. The preparation method of the coated ternary positive electrode material comprises the following steps: adding a ternary positive electrode material into a dispersion liquid containing graphene and WNb12O33, and heating and stirring until a solvent is evaporated to dryness to obtain a precursor; and carrying out first sintering on the precursor to obtain the coated ternary positive electrode material. The graphene and WNb12O33 compound coating on the surface of the ternary positive electrode material is stable in property and uniform in coating, and a lithium battery prepared from the positive electrode material is relatively excellent in electrochemical performance.

The invention belongs to the field of organic electroluminescent materials, and discloses a blue light host material, a preparation method and an organic electroluminescent device. The structure of the blue light host material is as shown in a chemical formula I: # imgabs0 #. After the blue light host material provided by the invention is applied to the organic electroluminescent device, the driving voltage of the photoelectric device can be reduced, the luminous efficiency of the photoelectric device can be improved, and the service life of the photoelectric device can be prolonged.

The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a wide-temperature-range sodium-ion battery electrolyte, a sodium-ion battery and a preparation method of the sodium-ion battery. The wide-temperature-range sodium-ion battery electrolyte comprises a sodium salt, an organic solvent, a first additive and a second additive, the first additive is a benzocrown ether compound as shown in a formula (1) and / or a formula (2); the second additive is a film-forming agent. The key of the invention lies in that the benzocrown ether compound with a specific structure is introduced into the sodium-ion battery electrolyte as an additive, so that anions are promoted to participate in a solvation structure, the migration rate of sodium ions is enhanced, side reaction is inhibited, formation of an SEI film is promoted, the working temperature window (-30-45 DEG C) of the electrolyte is expanded, and the service life of the electrolyte is prolonged. And the sodium ion battery (SIBs) has good electrochemical stability and good cycle performance in a working temperature window, so that the electrochemical performance of the SIBs under all-weather conditions is improved. # imgabs0 #

The invention belongs to the technical field of nanomaterials, and discloses a nanoflower-shaped FeOOH / NiFe-LDH composite material as well as a preparation method and application of the nanoflower-shaped FeOOH / NiFe-LDH composite material. The preparation method comprises the following steps: taking urea as a pH regulator, uniformly dispersing the urea, soluble nickel salt and soluble ferric iron salt in water, then adding a morphology control agent NH4F, and uniformly mixing to obtain a mixed solution; the mixed solution is subjected to a homogeneous reaction under the stirring condition, and after the reaction is finished, the nanoflower-shaped FeOOH / NiFe-LDH composite material is obtained. The preparation method is low in reaction temperature, short in reaction time and simple, the prepared composite material is of a three-dimensional structure, low in impedance and large in specific surface area, and the multi-phase composite material is multiple in charge transfer paths, high in electron migration rate, high in stability and excellent in electrochemical performance.

The invention relates to the technical field of lithium battery positive electrode materials, in particular to a neodymium-doped regenerated waste lithium iron phosphate positive electrode material and a preparation method thereof, and the positive electrode material is LiFe < 1-x > Nd < x > PO4; by doping lithium iron phosphate with a neodymium source, the lattice spacing is widened, the lithium ion transmission rate is increased, and the surfaces of doped material particles have conical flaky particle morphology; according to the method, plasma ball milling is cooperated with traditional solid phase sintering, operation is simple, the process is short, industrial application is easy, and meanwhile the regenerated positive electrode material has smaller particle size and better contact between particles. The discharge specific capacity of the obtained doped material under the condition of 1C reaches 150mAh / g, and the problem that the electrochemical performance is not ideal after neodymium is doped at present is solved to a great extent.

The invention discloses an all-organic polymer S-type heterojunction photocatalytic material and a preparation method and application thereof.The all-organic polymer S-type heterojunction photocatalytic material comprises a carrier and an organic polymer growing on the surface of the carrier, organic monomers are originally polymerized on the surface of carbon nitride to form an all-organic polymer S-type heterojunction, and the organic monomers are 1, 4-diacetylene benzene, 2, 4-diacetylene benzene and 2, 4-diacetylene benzene. The compound is 3, 5-diacetylene pyridine or 3, 6-diacetylene pyridazine; the preparation method comprises the following steps: (1) adding carbon nitride and a catalyst into a polar alkali solution, and uniformly mixing; and (2) putting an organic monomer into the mixed solution, and carrying out polymerization reaction to generate the all-organic polymer S-type heterojunction photocatalytic material in situ. The carbon nitride is selected as a carrier to be compounded with the organic conjugated polymer, the organic conjugated polymer can be adjusted to be matched with the energy band position of the carbon nitride by changing the molecular structure, an all-organic polymer S-shaped heterojunction is formed, the intramolecular charge transfer rate is higher, and the photocatalytic performance is improved.

The invention belongs to the technical field of solid-state lithium metal batteries, and discloses an amorphous inorganic ion conductor and a preparation method and application thereof, and the preparation method comprises the following steps: uniformly mixing lithium tetrachloroaluminate and sodium tetrachloroaluminate to obtain a mixture; and melting the mixture to obtain a molten precursor, and cooling the molten precursor to room temperature to obtain the amorphous inorganic lithium ion conductor Li < x > Na < 1-x > AlCl4, x being greater than or equal to 0.15 and less than or equal to 0.85, wherein the amorphous inorganic lithium ion conductor Li < x > Na < 1-x > AlCl4 is used as an interface phase between a positive electrode of a solid-state lithium metal battery and a solid-state electrolyte. The amorphous LixNa1-xAlCl4 has the remarkable advantages that the preparation temperature is low, the crystal structure of the product can be controlled, the ionic conductivity of the product is high, and the compatibility with a solid electrolyte and a positive electrode material is good. The method is short in preparation period, low in cost and suitable for industrial application.

The invention relates to a preparation method of a monolithic catalyst for methane catalytic combustion, which comprises the following steps: dipping a honeycomb carrier in titanium dioxide sol, taking out, drying, and roasting to obtain a carrier with a TiO2 coating; the carrier with the TiO2 coating is soaked in an active metal salt solution, 3-(trifluoroacetamido) pyrrolidine hydrochloride is added into the active metal salt solution, active metal is perovskite type metal composite oxide, the structural general formula is ABO, the carrier is taken out, dried and roasted, and the monolithic catalyst is obtained. The monolithic catalyst provided by the invention is used for catalytic combustion of methane, T90 is less than or equal to 500 DEG C, and the monolithic catalyst has the advantages of high low-temperature catalytic activity, good activity retention after long-term use and the like.

The invention relates to a preparation method of a high-conductivity lithium composite aqueous binder for a high-voltage positive electrode material, which comprises the following steps: adding carrageenan into deionized water, uniformly mixing, adding sodium carboxymethyl cellulose, and stirring and mixing at room temperature for 24 hours to prepare a carrageenan-sodium carboxymethyl cellulose solution; and adding a pyrrole monomer into the carrageenan-sodium carboxymethyl cellulose solution, stirring and mixing for 5 minutes at room temperature, adding an initiator, stirring overnight at room temperature, and polymerizing to obtain the high-conductivity lithium-conductivity composite aqueous composite binder. According to the binder prepared by the invention, the conductivity and lithium conduction performance of the binder are bidirectionally improved, multi-electron transfer of an active material is excited, and the lithium ion transport stability is improved, so that the first-circle coulombic efficiency and long cycle performance of an electrode are improved.

The invention relates to the technical field of batteries, in particular to a surface modification method of a positive electrode. The surface modification method of the positive electrode provided by the invention comprises the following steps that an aluminum source, a carbon nano tube and the positive electrode are mixed and calcined, the surface-modified positive electrode is obtained, the addition amount of the aluminum source is 300 ppm to 900 ppm, and the addition amount of the carbon nano tube is 300 ppm to 900 ppm according to the mass of the positive electrode. The surface of the positive electrode material is modified by coating the positive electrode material with the carbon nanotubes and the aluminum source, on one hand, contact between the positive electrode material and an electrolyte can be isolated to a great extent, and the cycle performance of the material is improved, and on the other hand, the mixture formed by the carbon nanotubes and the aluminum source has good rapid ion and electron transmission performance, and has good electrochemical performance. The migration rate of lithium ions can be improved, the direct-current resistance of the positive electrode material can be reduced, and meanwhile, the increase of the direct-current resistance in the circulation process is inhibited.

The invention provides a preparation method and application of a donor-receptor type two-dimensional imino CTF photocatalyst, and belongs to the technical field of photocatalyst preparation.The preparation method of the CTF photocatalyst comprises the following steps that 2, 4, 6-tris (4-aminophenyl)-1, 3, 5-triazine, terephthalaldehyde and 2, 4, 6-tris (4-aminophenyl)-1, 3, 5-triazine are mixed according to a certain proportion, and the donor-receptor type two-dimensional imino CTF photocatalyst is obtained. The preparation method comprises the following steps: by taking 2, 5-dimethoxy terephthalaldehyde or 2, 5-dihydroxy terephthalaldehyde as a raw material, reacting in a mixed solution of mesitylene / dioxane / acetic acid in a certain proportion for 3 days by adopting an inert gas sealing-solvothermal method, centrifuging the obtained product, sequentially washing with tetrahydrofuran and acetone for multiple times, and carrying out vacuum drying, thereby obtaining the 2, 5-dimethoxy terephthalaldehyde / 2, 5-dihydroxy terephthalaldehyde. The two-dimensional triazine CTF photocatalysts with different donor-receptor types are obtained. The preparation method comprises the following steps: by taking acetonitrile as a solvent, dispersing a photocatalyst into an arylamine solution with a certain concentration, stirring for 0.5 hour in a dark place, and carrying out catalytic reaction under visible light (lambda is greater than or equal to 420 nm), so that the preparation of the high-efficiency catalytic arylamine oxidative coupling reaction under the visible light is realized.

The invention belongs to the technical field of organic wastewater treatment, and particularly relates to an electro-Fenton technology based on ion exchange resin and application. The graphite felt is etched at a high temperature by adopting a transition metal oxide to prepare an efficient cathode material; ion exchange resin is used as a solid electrolyte to replace a traditional liquid electrolyte, a novel electro-Fenton technology is constructed to eliminate secondary pollution caused by the liquid electrolyte, and a conductive material is loaded on the surface of the ion exchange resin to improve the conductivity and reduce the wastewater treatment energy consumption. The electro-Fenton technology has the advantages of good treatment effect, no secondary pollution, wide pH application range, simple process, recyclability and environmental friendliness, and has a wide application prospect in the field of organic wastewater treatment.

The invention discloses modified ferromanganese ammonium phosphate, modified ferromanganese pyrophosphate and a preparation method and application of the modified ferromanganese ammonium phosphate and the modified ferromanganese pyrophosphate, and belongs to the technical field of battery materials. Adding an oxidizing agent and regulating the pH to form ammonium ferric phosphate, and carrying out ion exchange reaction on the ammonium ferric phosphate, manganese salt and doped metal salt to exchange iron elements in the ammonium ferric phosphate to form metal doped ammonium manganese ferric phosphate; meanwhile, the exchanged iron ions continuously react with phosphate radicals generated by converting manganese ions, doped metal ions and ferrous dihydrogen phosphate into iron phosphate in the system to form metal-doped manganese iron ammonium phosphate, so that manganese, iron and doped metal atoms can be uniformly distributed in a precursor crystal lattice at an atomic level; the generation of a non-solid solution impure phase and a solid solution phase with a non-target manganese-iron ratio and the introduction of anion impurities are effectively avoided, so that the ratio of metal to phosphorus in the metal-doped ammonium manganese iron phosphate obtained by the reaction is less than 1, and the electrochemical performance of the modified lithium manganese iron phosphate is favorably improved when the metal-doped ammonium manganese iron phosphate is applied to the positive electrode material.

The invention relates to application of iron-doped carbon nitride rich in nitrogen vacancies, in particular to application of the iron-doped carbon nitride rich in the nitrogen vacancies in degradation of active pharmaceutical compounds based on a degradation system of UV-LED / NaClO and / or UV-LED / NH2Cl. The removal rates of the UV-LED / NaClO / Fe-g-C3N4-Nv degradation system and the UV-LED / NH2Cl / Fe-g-C3N4-Nv degradation system on carbamazepine are as high as 98.3% and 67.2% respectively, the oxidation capacity of g-C3N4 is enhanced through iron doping, a new intermediate energy level is formed through introduction of nitrogen vacancy, the effect of an electron capturer is achieved, a new electron transmission channel is formed under the combined action of iron doping and nitrogen vacancy, and the degradation efficiency of carbamazepine is improved. The migration rate of electrons and the separation efficiency of photon-generated carriers are obviously improved; meanwhile, the Fe-g-C3N4-Nv achieves efficient activation of NaClO and NH2Cl through O2.-and hvb + under UV-LED irradiation, the yield of HO., RCS and RNS in a degradation system is increased, the adaptability to water quality fluctuation is high, and stable degradation of pharmaceutical active compounds can be achieved.

The invention relates to a proton ceramic fuel cell composed of an oxygen site F-doped perovskite electrode and an electrolyte, and belongs to the technical field of fuel cells. According to the invention, an F element is doped into a perovskite oxygen electrode and an electrolyte material of the proton ceramic fuel cell, and a traditional BaCo < 0.4 > Fe < 0.4 > Zr < 0.1 > Y < 0.1 > Y < 0.1 > b < 0.1 > O < 3-delta > (BZZY ) oxygen electrode, a traditional BaZr < 0.1 > Ce < 0.7 > Y < 0.1 > Y < 0.1 > b < 0.1 > O < 3-delta >-0.1 F < 0.1 > (BCFZYF) oxygen electrode, a traditional BaZr < 0.1 > Ce < 0.7 > Y < 0.1 > Y < 0.1 > b < 0.1 > O < 3-delta >-0.1 F < 0.1 > (BZCYY < bF >) electrolyte and a traditional Ni-BZCYY < bF >) hydrogen electrode are optimized. F is doped into an oxygen site of the perovskite oxide, so that B-site metal-oxygen bond energy can be reduced, the activity of lattice oxygen and the transmission rate of oxygen ions and protons can be improved, the strategy can be applied to an electrode and an electrolyte at the same time, ion migration and interface compatibility at the interface of the battery electrode and the electrolyte are remarkably optimized, and the performance of the battery is improved. And the overall power density of the battery is greatly improved.

The invention discloses a preparation method of a superhard high-entropy alloy nitride coating on the surface of an alloy material, which comprises the following steps: taking an alloy workpiece, and carrying out glow cleaning on the alloy workpiece in a vacuum environment; the cleaned alloy workpiece is placed in an argon environment, the air pressure of a vacuum chamber ranges from 0.3 Pa to 1 Pa, an AlCrTiVZr target material is sputtered to the alloy workpiece through HiPIMS, the deposition time ranges from 1 min to 10 min, and an AlCrTiVZr over-plating layer is gradually formed on the surface of the alloy workpiece; and the sputtering condition is kept, nitrogen is introduced into the reaction environment, the flow value of the nitrogen ranges from 4 sccm to 40 sccm, the deposition time ranges from 60 min to 180 min, the AlCrTiVZr over-plating layer is deposited on the surface of the alloy workpiece, and the high-entropy alloy nitride coating is formed. The problems that a columnar crystal microstructure on the surface of a common high-entropy alloy nitride coating is loose and many micropores exist are solved, the hardness of the coating is improved to 41.8 GPa, and the surface roughness of the coating is maintained to be 2 nm or below.

The invention provides a battery composite isolating membrane. The battery composite isolating membrane comprises a polyolefin base material; the surface of the first solid electrolyte particle is provided with siloxane groups; the surface of the second solid electrolyte particle is coated and modified by one or more of PVDF (Polyvinylidene Fluoride), PEO (Polyethylene Oxide) and PMMA (Polymethyl Methacrylate); the first solid electrolyte particles are distributed in internal holes of the polyolefin base material, and the second solid electrolyte particles are distributed on the surface of the polyolefin base material. The battery composite isolating membrane has low impedance, high ionic conductivity and high safety, and is suitable for being used as a diaphragm of a lithium ion battery. The invention further provides a preparation method of the battery composite isolating membrane.

The invention relates to the technical field of hydrogel, and discloses a conductive hydrogel matrix preparation method and a flexible strain sensor, prepared methoxypolyethylene glycol modified chitosan, a multi-arm alkenyl betaine type cross-linking agent, acrylamide and the like are polymerized to obtain a conductive hydrogel matrix, and the conductive hydrogel matrix can be used for preparing the flexible strain sensor; the multi-arm alkenyl betaine type cross-linking agent contains six alkenyl structures and can form a compact three-dimensional cross-linked network structure, and physical winding of an internal network of the organic hydrogel and strong hydrogen bonds of the chitosan cooperate to form strong physical cross-linking interaction; dipole-dipole interaction in quaternary ammonium salt and sodium sulfonate zwitterions is beneficial to ion migration, free moving ions with the maximum concentration can be released, the ion migration rate and conductivity are improved, and sensitive transmission of signals is facilitated; the conductive hydrogel matrix can be tightly bonded with base materials such as rubber and tinplate, and the bonding strength is high.

The invention provides a magnesium alloy hydrogen storage material and a preparation method thereof, and particularly relates to the technical field of hydrogen storage alloys. The chemical formula of the magnesium alloy hydrogen storage material is Mg < 100-a-b-x-y > Ni Zr Na < x > Ce < y >, wherein 10 < = a < = 20; 0.1 < = b < = 2; 0.1 < = x < = 2; 1 < = y < = 15. According to the magnesium alloy hydrogen storage material, the element cerium is added into the magnesium alloy, the cerium element reacts with hydrogen to generate stable CeH2.73, the compound always exists in the whole hydrogen charging and discharging process, an additional channel is provided for diffusion of hydrogen atoms, and the migration rate and efficiency of the hydrogen atoms are remarkably improved. The stable compound plays a role of a catalyst, the activation energy of the magnesium-based material is reduced, and the adsorption and release of hydrogen are promoted, so that the hydrogen charging and discharging performance is improved.

The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a sodium-ion battery negative electrode material with monatomic sodium-philic sites as well as preparation and application of the sodium-ion battery negative electrode material. The method comprises the following steps: (I) dissolving sodium lignin sulfonate and metal salt in water according to a ratio, and putting the solution into a high-temperature and high-pressure reaction kettle for hydrothermal reaction; and (II) filtering, cleaning and drying a product after the hydrothermal reaction, mixing the product with a nitrogen source, and performing high-temperature carbonization in a high-temperature tubular furnace to obtain the sodium ion battery negative electrode material. In the preparation method, the hydrothermal product added with the metal salt is directly carbonized at a high temperature to prepare the hard carbon negative electrode material with rich micropore content, and the sodium ion battery negative electrode material with a monatomic sodium-philic site can be prepared by further converging a nitrogen source and carbonizing at a high temperature in the step II. According to the invention, the problems of slow sodium ion migration rate and relatively low reversible capacity in the existing hard carbon negative electrode material are solved.

The invention belongs to the technical field of preparation of nano-composite functional materials, and discloses a modified alkali metal anode based on a COF in-situ self-assembled artificial SEI layer and a preparation method and application of the modified alkali metal anode. The alkali metal anode can effectively and efficiently inhibit dendritic crystal growth and has high Young modulus, and an assembled battery is high in cycling stability and has good alkali metal ion migration rate and good interface performance; the preparation method is simple, the COF layer is synthesized in situ on the surface of the alkali metal through self-deposition assembly of the COF precursor, the COF layer has a rich pore structure and can uniformly induce deposition of alkali metal ions and inhibit growth of dendrites, and the problem that in the prior art, lithium dendrites are easily generated in a negative electrode of an alkali metal battery, so that the performance of the battery is affected is solved.

The invention relates to a negative pole piece, a secondary battery and a device. The negative pole piece comprises a negative active material layer, the negative active material layer comprises graphite and an acrylic acid-acrylonitrile copolymer binder, and the acrylic acid-acrylonitrile copolymer binder comprises a first acrylic acid unit, a second acrylic acid unit and an acrylonitrile unit, at least one of the first acrylic acid unit and the second acrylic acid unit contains an alkali metal element, and the alkali metal element comprises at least one of Li, Na and K; the negative pole piece meets the condition that (1-Z) * B + W is greater than or equal to 0.2 and less than or equal to 3; wherein based on the mass of the acrylic acid-acrylonitrile copolymer binder, the mass percentage content of the alkali metal element is W, and the mass percentage content of the acrylonitrile unit is Z; the specific surface area of the graphite is B, and the unit is m < 2 > / g. Therefore, the negative pole piece and the secondary battery have at least one of the following advantages: excellent first coulombic efficiency and calendar life.

The invention discloses an inorganic solid electrolyte ceramic material containing oxygen vacancies and a preparation method thereof, and belongs to the technical field of lithium ion batteries. Tantalum-doped lithium lanthanum zirconate (LLZTO) solid electrolyte powder with a garnet type cubic phase structure is prepared through a solid phase method, the LLZTO fine powder obtained through grinding is subjected to annealing treatment in a reducing atmosphere to obtain LLZTO fine powder containing oxygen vacancies, the powder is subjected to cold press molding after being subjected to ball milling and drying, and the electrolyte sheet containing the oxygen vacancies is obtained through high-temperature sintering in the reducing atmosphere. According to the present invention, the Ta-doped LLZO is synthesized, the lattice of the prepared solid electrolyte contains the oxygen vacancy through the two-time reduction, the oxygen vacancy defect can reduce the activation energy of the lithium ion transmitted along the crystal grain and the crystal boundary, and the rapid migration of the lithium ion on the surface of the electrolyte is promoted so as to improve the ionic conductivity of the electrolyte sheet.