889 results about "Ion doping" patented technology

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a calcium ion doped modified sodium ion positive electrode material and a preparation method thereof, a positive electrode plate and a half battery. The calcium ion doped modified sodium ion positive electrode material comprises a sodium source, a doping source and a precursor, and is characterized in that the chemical general formula of the positive electrode material is Na < 1-x > M < x > Ni Fe Mn < c > O < 2 >, the value range of the doping sources M and x is x < = 0.05, a + b + c = 1, and all elements in the chemical formula meet charge balance. Sodium sites in a layered structure are replaced by calcium ion doping, so that interlayer spacing is enlarged, sodium ion transmission kinetics is enhanced, and adverse phase change is inhibited. The sodium ion positive electrode material shows high specific capacity and excellent cycle stability, the capacity retention ratio is 93.03% after 100 times of cycle charge and discharge at 1C, and the sodium ion positive electrode material has the characteristics of simple preparation, low cost, high specific capacity and excellent cycle performance.

The invention relates to a preparation method and application of a manganese ion doped modified ferric sodium pyrophosphate positive electrode material, and belongs to the technical field of sodium ion battery positive electrodes. The preparation method comprises the following steps: adding a sodium source, a phosphorus source and a carbon source into ethanol, uniformly mixing to form a mixed solution, sequentially adding an iron source and a manganese source into the mixed solution, uniformly mixing to form slurry, and drying the slurry to obtain precursor powder; calcining in a protective atmosphere to obtain a manganese-doped carbon-coated ferric pyrophosphate sodium material; the calcining conditions are as follows: heating to the temperature of 300-350 DEG C at the heating rate of 2-3 DEG C / min, carrying out first-stage constant-temperature calcination for 2-3 hours, heating to the temperature of 500-550 DEG C at the heating rate of 5-8 DEG C / min, and carrying out second-stage constant-temperature calcination for 10-12 hours. By doping the manganese ions, the electronic conductivity and the ion diffusivity of the ferric sodium phosphate pyrophosphate composite material are improved, so that the discharge capacity of the ferric sodium phosphate pyrophosphate composite material at high rate is improved, and the battery has relatively high cycle stability.

Nanomaterials and methods of preparation and use thereof, are disclosed. The nanomaterials include a non-noble metal substrate and noble metal atoms on a surface of the non-noble metal substrate. The noble metal atoms simultaneously coordinate with a halogen and oxygen. The substrate has a large specific surface area and a large electrochemical active area, and the surface coordination environment of the noble metal affects the electronic structure and catalytic activity of a resulting catalyst. The noble metal surface coordination structure may be regulated and controlled by a synthesis temperature, an alkalinity, a reaction time, and an electrodeposition voltage range. A hydroxide ion and the halogen coordinate with the noble metal, exhibiting an unsaturated pentacoordinate state. Doping the substrate with reducing metal ions may increase the loading capacity, anchor the noble metal atoms, and improve anodic oxygen evolution and cathodic hydrogen evolution in seawater electrolysis.

The invention discloses application of a metal ion doped graphene oxide film in catalytic synthesis of Schiff base. The metal ion doped graphene oxide film comprises a graphene oxide film and metal ions loaded on the surface and between layers of the graphene oxide film. Metal ions in the metal ion-doped graphene oxide film induce reactant molecule orientation through a cation-pi effect, and a confinement channel formed between the metal ions and GO is combined, so that a front line molecular orbit of a reactant for catalytic synthesis of the Schiff base is better matched, the molecular freedom degree is reduced, and the Schiff base catalytic synthesis efficiency is improved. And the molecules are subjected to bond breaking and bond forming reactions in a specific orientation. Molecules are orderly arranged among layers and flow to pass through a two-dimensional nano confinement channel provided by the graphene oxide nanosheets among the film layers, so that the reaction activation energy is reduced, and efficient catalytic synthesis of various Schiff bases is realized at room temperature. Meanwhile, by regulating and controlling the chemical microstructure of the membrane material, the catalytic reaction efficiency and the reaction selectivity can be effectively improved.

The invention discloses a preparation method of an in-situ synergistic modified sodium manganese vanadium phosphate electrode material, which comprises the following steps: taking a phosphorus source, a manganese source, a vanadium source, a sodium source and a carbon source as raw materials to obtain a precursor, and adding a modified material to obtain a composite precursor; and calcining in an inert atmosphere to obtain the in-situ synergistically modified manganese vanadium sodium phosphate. The preparation method has the advantages that the precursor is synthesized by a simple solid-phase method, in-situ synergistic modification is performed by a wet chemical method, a fluoride coating layer is constructed on the surface of the sodium manganese vanadium phosphate material, a cation doping effect is achieved, the structural stability of the sodium manganese vanadium phosphate material is enhanced, and the diffusion rate of sodium ions is increased. An electrochemical test result of a battery assembled by the material subjected to in-situ synergistic modification shows that the material has higher capacity retention ratio and long cycle performance, and the electrochemical performance of the sodium manganese vanadium phosphate electrode material is effectively improved.

The invention relates to a preparation method of a nickel ion doped modified ferric sodium pyrophosphate positive electrode material, and belongs to the technical field of sodium ion battery positive electrode materials. The nickel ion doped modified ferric sodium pyrophosphate positive electrode material is prepared by adopting an integrated process system of liquid phase uniform mixing, spray granulation and precise segmented calcination. According to the process system, atomic-scale uniform doping of nickel ions and a specific microstructure of a precursor are realized through spray drying, and a plurality of inherent key technical problems of low electronic conductivity, low ion diffusion rate, impurity phase generation and the like of an NFPP material are solved together through a synergistic effect with a subsequent calcining process; furthermore, the discharge capacity of the ferric sodium phosphate pyrophosphate composite material at high rate is improved, so that the battery has relatively high cycling stability.

The invention provides a borate loaded alpha-Fe2O3 photo-anode as well as a preparation method and application thereof, and belongs to the technical field of material science and photoelectrocatalysis. The preparation method comprises the following steps: S1, growing a beta-FeOOH film on FTO (Fluorine-doped Tin Oxide) conductive glass by utilizing a hydrothermal method; s2, the beta-FeOOH thin film is subjected to high-temperature annealing treatment in an inert atmosphere, and an alpha-Fe2O3 thin film is obtained; and S3, the alpha-Fe2O3 thin film is put into a boric acid solution to be soaked, then the soaked alpha-Fe2O3 thin film is subjected to low-temperature annealing treatment in an inert atmosphere, a borate thin film is formed on the surface of the alpha-Fe2O3 thin film, and the borate-loaded alpha-Fe2O3 photo-anode is obtained. According to the preparation method, the problems that alpha-Fe2O3 is poor in conductivity, low in charge transfer efficiency, high in overpotential of oxygen evolution reaction and the like are solved by means of the strategies of ion doping and surface loading of borate in the step S3, the photoelectrochemical performance of alpha-Fe2O3 is improved, and the borate loaded alpha-Fe2O3 photo-anode meets the application requirement in a photoelectrochemical cell.

The invention relates to the technical field of lithium ion batteries, in particular to a modified cobalt-free lithium-rich manganese-based positive electrode material doped with anions and cations and a preparation method of the modified cobalt-free lithium-rich manganese-based positive electrode material. According to the method, a modified lithium-rich manganese-based precursor is prepared from a metal salt solution, a precipitator, a fluorine source and a complexing agent, and the anion-cation co-doped cobalt-free lithium-rich manganese-based positive electrode material is prepared from the modified lithium-rich manganese-based precursor and a lithium source. The metal salt solution contains manganese salt, nickel salt and aluminum salt. According to the method, by doping Al and F, the voltage attenuation is effectively reduced, the long cycle performance of the material is improved, the rate capability of the material is improved, and in addition, mixed arrangement of lithium and nickel cations is effectively inhibited, so that the cycle stability is improved.

The invention discloses a sodium ferric pyrophosphate material with a sodium storage dominant crystal face regulated and controlled by cation doping as well as a preparation method and application of the sodium ferric pyrophosphate material. The chemical formula of the prepared sodium ferric pyrophosphate material with the regulated and controlled crystal structure is Na < 4 > Fe < 2.97 > M < 0.03 > (PO4) < 2 > P < 2 > O < 7 >. Wherein M = Sr, or Sr and a second doping element, and the second doping element is selected from one of Cd, Bi, Mo, Ni and Al. The material is prepared by adopting a sol-gel method, an iron source, a chelating agent, a sodium source, a phosphorus source and doping elements are dissolved in deionized water, and stirring is performed until a gel state is formed; and drying and calcining twice to obtain a final product. The sodium ferric pyrophosphate electrode material prepared by the invention has more sodium storage dominant crystal faces, shows good electrochemical performance, has the advantages of simple preparation process, easily available raw materials and low cost, has remarkable industrial application value, and is easy for large-scale production.

The invention discloses an ion doping method based on first principle calculation and application thereof. Relates to the technical field of building materials. The method comprises the following steps: firstly, constructing a cement clinker mineral phase crystal structure model, and performing structural relaxation on the model to obtain a model crystal structure with a determined lattice constant; secondly, analyzing and optimizing microstructure changes and corresponding energy state changes of various mineral phases in the ion doping process by utilizing a quantum mechanical simulation means, representing the solid solubility of doped ions and mineral phase structures through the defect formation energy of ion doping, forming energy being negative reaction process being spontaneous process, the closer to 0, the better the solid solubility, and the more to 0, the better the solid solubility; therefore, how to enhance the hydration reaction activity and improve the strength by ion doping is disclosed. The mechanical property, durability and corrosion resistance of the cement are improved by accurately regulating and controlling the characteristics of the multi-mineral-phase structure.

The invention discloses an ytterbium ion doped samarium calcium oxide borate nonlinear optical crystal and a preparation method and application thereof.The crystal belongs to a monoclinic system, an m point group and a Cm space group, the chemical formula is YbxSm1-xCa4O (BO3) 3, the chemical formula is 0.1-0.99, the cell parameters are as follows: a = 8.064-8.110, b = 16.045-16.062, c = 3.570-3.600, alpha = gamma = 90 degrees and beta = 100.80-101.38 degrees, and the ytterbium ion doped samarium calcium oxide borate nonlinear optical crystal has good crystal quality and transmittance as high as 87% and can be applied to high-power laser devices, such as laser devices, laser devices, laser devices and the like. The method is widely applied to the fields of photoetching machines, laser medical treatment, laser cutting and the like, and the preparation method has the advantages of being low in cost, high in quality, stable in performance, suitable for large-scale production and the like.

The invention discloses an anion and cation high-entropy doped lithium-rich manganese-based positive electrode material, preparation and a battery based on the material, and relates to the technical field of lithium-rich manganese-based positive electrode materials, the chemical formula of the material is Li1. 2NixMnyA0.8-x-yOzB2-z, A is at least four of Al, Ti, Mg, V, Cr, Fe, Cu, Zn, Zr, Nb, Mo, Ru, Sn, Sb, Te, Ta, W, Se, Ce and Co, the content of A is represented by a1, a2, a3, ai... an1 (n1 is greater than or equal to 4), B is at least one of F, Cl, S, Br and I, the content of B is represented by b1, b2, bi... bn2 (n2 is greater than or 0.8, 0 lt; ai < = 0.1, # imgabs0 # 1.5 < = zlt; 2, 0lt; the invention provides a positive and negative ion high-entropy doped lithium-rich manganese-based positive electrode material and a preparation method thereof, and a battery based on the material, on the basis of positive ion doping, doping of negative ions at the O position is further introduced, the structural stability is further improved, and the capacity and voltage decline in the cycle process are reduced, so that the lithium-rich manganese-based positive electrode material meets the requirements of the # imgabs 1 # and the # imgabs 2 #, and the lithium-rich manganese-based positive electrode material meets the requirements of the # imgabs 1 # and the # imgabs 2 #.

The invention relates to the technical field of integrated circuits, in particular to a simulation test method and device for a semiconductor device. The method comprises the following steps: acquiring simulation parameter information of a first target device, wherein the simulation parameter information of the first target device comprises a first nuclear blocking correction parameter value; performing a simulation test based on the simulation parameter information of the first target device, and obtaining simulation transverse ion doping concentration distribution and a simulation threshold voltage value of the preset region; updating simulation parameter information of the first target device; performing a simulation test based on the updated simulation parameter information of the first target device, and obtaining another simulation transverse ion doping concentration distribution and another simulation threshold voltage value of the preset area; and taking the simulation threshold voltage value with the highest matching degree with the actual threshold voltage value of the first target device in all the simulation threshold voltage values as a target threshold voltage value, and determining the simulation transverse ion doping concentration distribution corresponding to the target threshold voltage value as target transverse ion doping concentration distribution.

The invention discloses cyan borosilicate glass and a preparation method thereof, and belongs to the field of optical materials. The borosilicate glass comprises the following components in percentage by weight: 20-45 mol% of SiO2; b2O3: 25 to 55 mol%; 20 to 35 mol% of SrO; eu < 2 > O < 3 >: 0.05 to 2.5 mol%; wherein the sum of the three components of SiO2, B2O3 and SrO is 100 mol%; wherein the external doping concentration or the internal doping concentration of the rare earth ions is 0.05-2.5 mol% of the sum of the three components of SiO2, B2O3 and SrO. The invention also discloses a method for preparing the borosilicate glass, the preparation temperature of the green borosilicate glass does not exceed 1460 DEG C, and Eu < 3 + > ions are reduced into Eu < 2 + > ions in an air atmosphere. The excitation wavelength of the cyan borosilicate glass is in the range of 230-420 nm, the cyan borosilicate glass is well matched with the characteristic wavelength of an existing commercial semiconductor chip, the quantum efficiency reaches up to 88.57% under excitation of 300 nm, the emission wavelength ranges from 470 nm to 500 nm under excitation of 410 nm, the defect of the cyan color in the full spectrum is well overcome, and the blue borosilicate glass can be applied to the field of semiconductor chips. And the method can be widely applied to the field of full-spectrum white-light LED illumination.

The invention discloses an oxide-coated ion-doped sodium ferric sulfate positive electrode material as well as a preparation method and application thereof. The positive electrode material is formed by compounding a sodium ferric sulfate bulk phase material doped with various valence metal cations and anions and coated with carbon similar to a positive temperature coefficient thermosensitive metal oxide. Wherein the metal cations with various valence states are doped on Na or Na / Fe ion sites of the sodium ferric sulfate, the doped anions occupy part of three-dimensional S-O tetrahedron positions, the inorganic carbon in the carbon compound is uniformly distributed in the sodium ferric sulfate bulk phase material, and the organic carbon is uniformly distributed outside the sodium ferric sulfate bulk phase material. The positive electrode plate assembled battery prepared from the positive electrode material has the advantages of high reversible charge-discharge capacity, excellent cycle performance and rate capability and high electron and ion migration rate in a low-temperature environment. The method is low in raw material cost, simple in synthesis method, short in production period and suitable for large-scale continuous production.

The present invention relates to the technical field of batteries, and in particular to a positive electrode material, a preparation method, a positive electrode sheet, and a sodium-ion battery. The positive electrode material comprises cation-doped sodium iron sulfate and a carbon material, and the chemical formula of the cation-doped sodium iron sulfate is NaxAyFe1-zBz(SO4)m, wherein 1.1≤x+y≤1.7, 0≤y≤0.17, 0≤z≤0.1, y and z are not 0 at the same time, and x, y, z and m comply with charge balance; A is K+, B is selected from one or more of Mn2+, Ni2+, Co2+, Cu2+, Ca2+, Mg2+, Ba2+, and Zn2+. The present application improves the quality and consistency of positive electrode material products, improves the electrochemical sodium storage performance of positive electrode materials, improves the cycle performance and the rate performance of the positive electrode materials, ensures the large-scale mass production of the materials, and improves the production efficiency of finished materials, thereby reducing costs.

The invention relates to a rare earth ion doped enhanced ionizing radiation luminescence low-dimensional halide scintillator and a preparation method and application thereof, and belongs to the technical field of scintillating materials. Aiming at the problems that the radiuses of RE ions and low-dimensional halide A5B3 (ClxBryI1-x-y) 8 materials are poor in lattice adaptation degree, the melting points of the RE ions and the low-dimensional halide A5B3 (ClxBryI1-x-y) 8 materials are difficult to consider in the doping process, concentration segregation is easy to occur and large-size crystals are difficult to grow, the solid-solution ratio of halogen anions and the doping concentration of the rare earth ions are regulated and controlled, namely 0.25 < = x < = 0.875, 0 < = y < = 1, x + y < = 1 and 0 < m < 10 are controlled; meanwhile, a rotation descent method is adopted for crystal growth, the scintillator single crystal material A5B3 (ClxBryI1-x-y) 8: m at% RE with the advantages of high ionizing radiation luminous efficiency, high light output and the like is finally obtained, and the material can be applied to the fields of X-ray imaging, gamma-ray detection, particle detection and the like.

The invention belongs to the technical field of new energy materials, and particularly relates to a multi-cation doped ammonium manganese ferric phosphate precursor, carbon-coated modified lithium manganese ferric phosphate and a preparation method and application thereof. According to the multi-cation doped ammonium manganese ferric phosphate precursor prepared by the invention, a step-by-step synthesis method is adopted, an iron phosphate compound is firstly prepared, then manganese ion exchange and metal cation doping are synchronously performed to obtain a precursor, and the obtained precursor, a lithium source and a carbon source are subjected to solid-phase sintering to obtain the multi-cation doped ammonium manganese ferric phosphate precursor. And the prepared carbon-coated modified lithium manganese iron phosphate is used for constructing a lithium ion battery. An electrochemical performance test result shows that the obtained lithium ion battery has excellent capacity retention ratio, cycling stability, rate capability and charge-discharge capacity; moreover, the preparation method of the carbon-coated modified lithium manganese iron phosphate is simple and convenient to operate, few in by-products, nanocrystallized in particle size and high in raw material conversion rate, ensures that all doping elements are uniformly distributed in the material and the sulfur content reaches the battery level, and is suitable for industrial production.

The invention provides a potassium-magnesium-silicon ternary co-doped sodium vanadium phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of energy materials. The positive electrode material is formed by doping a Na site with K < + > ions, doping a V site with Mg < 2 + > ions and doping a P site with Si < 4 + > ions, and the chemical formula of the positive electrode material is Na < 3.1 > KxV < 2-x > Mgx (PO4) 2.9 (SiO4) 0.1 / C (x = 0.03, 0.05, 0.07); according to the invention, ammonium metavanadate, sodium acetate and ammonium dihydrogen phosphate are used as raw materials, potassium dihydrogen phosphate, magnesium acetate tetrahydrate and tetraethyl silicate are used as doping sources, citric acid monohydrate is used as a chelating agent, and the potassium-magnesium-silicon ternary co-doped sodium vanadium phosphate electrode material is prepared by a solution gel method, so that the electronic conductivity is improved, the rate capability and the cycle stability are improved, and the preparation method is simple and convenient. The preparation method has a good application prospect in sodium ion battery positive electrode materials.

The invention belongs to the technical field of positive electrode materials for lithium ion secondary batteries, and particularly discloses a high-valence cation doped high-nickel lithium-rich manganese-based positive electrode material and a preparation method thereof, the chemical formula of the high-valence cation doped high-nickel lithium-rich manganese-based positive electrode material is Li < 1.13 > (Mn < 0.522 > Ni < 0.261 > Co < 0.087 >) < 1-x > Nb < x > O < 2 >, and x is greater than or equal to 0 and less than or equal to 0.005. According to the high-valence cation doped high-nickel lithium-rich manganese-based positive electrode material and the preparation method thereof, by doping the Nb doped high-nickel lithium-rich manganese-based positive electrode material, the voltage attenuation is effectively reduced, the long cycle performance of the material is improved, the rate capability of the material is improved, in addition, a firm Nb-O bond can effectively stabilize an oxygen lattice frame, and the high-valence cation doped high-nickel lithium-rich manganese-based positive electrode material is prepared. Phase change is slowed down, so that irreversible release of oxygen is inhibited, and the structural stability of the material is improved.

The invention belongs to the technical field of sodium ion battery positive electrode materials, and discloses a preparation method and application of an iron ion doped sodium vanadium phosphate positive electrode material. Modification is carried out by doping iron ions in vanadium sites and taking citric acid as a carbon source for coating, iron nitrate nonahydrate serves as an iron source to participate in the modification process, meanwhile, citric acid is used for carrying out carbon coating on the material, and the citric acid and the doped iron ions synergistically increase the ionic conductivity, so that the problem that the sodium vanadium phosphate material is poor in conductivity is solved. Besides, in the sintering treatment process, the Na3V1.8 Fe0.2 (PO4) 3 / C positive electrode material obtained by doping 0.2 molar weight of iron ions and coating citric acid is always kept in the atmosphere of argon-hydrogen mixed gas, after circulation at the current density of 0.1 C to 20 C, the capacity recovery rate can reach up to 96.1%, and the capacity can still be kept to be 74.1% of the initial capacity at the high rate of 20 C; after 500 cycles under 1C current density, the capacity retention rate is 89.8%, while the capacity retention rate is only 72% after 500 cycles of pure NVP, the rate capability and cycling stability of the material are both improved, and the electrochemical performance of the material is effectively ensured.

The invention discloses a high-performance single rare earth doped fluoride, a flexible scintillation screen and application. The single rare earth doped fluoride is Cs (1-x) NaxLu (2-y) LnyF7, wherein x < lt > is greater than or equal to 0.3; 0.4, Ln is Tb, Dy or Pr; the single rare earth doped fluoride is prepared by a thermal decomposition method, the single rare earth doped fluoride can be uniformly mixed with a prepolymer solution of a substrate and then subjected to spin coating and drying to obtain the flexible scintillation screen, and the flexible scintillation screen is used for X-ray high-resolution delayed imaging of an object. The invention provides the fluoride scintillator with single ion doping, simple structure, controllable shape and strong XEOL and XEPL, the manufacturing process is simple, and the minimum number of fluoride scintillator particles can be used for manufacturing a flexible scintillation screen based on a thin film, so that high-resolution flexible delay non-planar imaging capable of responding to X rays is realized.

The invention relates to an egg yolk shell structure ion-doped sodium ferric sulfate positive electrode material, a preparation method and an application thereof, and the material is an egg yolk shell sphere structure carbon composite sodium ferric sulfate positive electrode material formed by doping cations A and B at Na or Na / Fe ion sites of sodium ferric sulfate and enabling anions to occupy part of S-O tetrahedral positions to change the arrangement mode of Fe-O octahedrons of the sodium ferric sulfate, the shell and the inner core of the egg yolk shell sphere are uniform in material, a gap exists between the shell and the inner core, and carbon is uniformly distributed and coated inside and outside the material. The invention also discloses a preparation method and application of the egg yolk shell structure ion-doped sodium ferric sulfate positive electrode material. The material is large in specific surface area, the reversible charge-discharge capacity of an assembled battery is high, and the cycle performance and the high-rate performance are good. The method is low in raw material cost, simple, short in production period and suitable for large-scale continuous production.

The invention relates to metal ion doped lithium hexafluorosilicate and a preparation method thereof, a negative plate and a preparation method thereof, and a lithium ion battery, the chemical formula of the metal ion doped lithium hexafluorosilicate is Li (2-x) AxSiF6, A is a first main group metal and does not comprise Li, x is 0.5-1.5, x is 0.5-1.5, and x is 0.5-1.5. And the negative plate comprises a current collector, an active material layer attached to the surface of the current collector, and an SEI film prepared from the Li2-xAxSiF6. The Li < 2-x > AxSiF6 has a relatively large interlayer spacing and a rich pore structure, an SEI film is pre-formed on the surface of the negative electrode plate by adopting the Li < 2-x > AxSiF6, and the desolvation capability of Li < + > can be better improved by the rich pore structure and the relatively large interlayer spacing in the circulation process; according to the present invention, the transmission of Li < + > is accelerated, and the inorganic matter-rich SEI film is generated between the SEI film and the active material layer after the uniform deposition of the lithium is induced, such that the generation of the lithium dendrites is further inhibited, the cycle stability and the service life of the lithium ion battery are improved, and the stability and the capacity of the negative electrode plate during the rapid charging are significantly improved.

The invention relates to the technical field of sodium-ion batteries, and discloses a preparation method and application of a cation-doped polyanion type sodium-ion battery positive electrode material, the chemical formula of the positive electrode material is Na < 4 + x > Fe < 3-y > TMy (PO4) 2P2O7, TM is one or more of transition metals with the same valence state as Fe < 2 + > in Mn, Co, Ni, Cu and Zn, x is more than 0 and less than or equal to 0.5, y is more than 0 and less than or equal to 0.4; precursor wet gel is obtained through a sol-gel process, and is sintered after being dried. The transition metal cations with the same valence state and different electronic structures are introduced into the Fe site of the material, and the electron transmission rate is effectively increased and the ion diffusion kinetics is enhanced by adjusting the Fe coordination environment; when the Na < 4 + x > Fe < 3-y > TMy (PO4) 2P2O7 positive electrode material prepared by the invention is applied to a sodium ion battery, high specific discharge capacity, excellent rate capability and cycle performance are shown.

The invention belongs to the technical field of luminescent materials, and discloses an up-conversion nano material as well as a preparation method and application thereof. The up-conversion nano material comprises a core, the element composition of the core is NaErF4: Nd, Yb and Ce, and the molar weight of Nd accounts for 2%-15% of the total molar weight of rare earth elements of the core; the core is coated with a middle shell, the element composition of the middle shell is NaYF4: Yb, and the molar weight of Yb accounts for 20%-100% of the total molar weight of rare earth elements of the middle shell; the outer part of the middle shell is coated with a passivation shell, and the element composition of the passivation shell is NaYF4. According to the up-conversion nano material, through fine ion doping and a unique energy transfer mechanism, efficient up-conversion blue and ultraviolet light emission of Er < 3 + > can be achieved; the preparation method of the up-conversion nano material is simple in process, easy to operate, low in cost, short in period and suitable for mass production.

The invention discloses a divalent manganese ion-doped cadmium-based metal halide nanocrystalline scintillator material and a preparation method and application thereof, divalent manganese ions are doped in Cs3Cd2Cl7 to form full-inorganic cadmium-based halide scintillator nanocrystalline, conversion from cyan light to yellow light is realized, efficient yellow light emission with the quantum efficiency of 20.6% is further realized, and the fluorescence lifetime is 0.652 microseconds. The invention further discloses a preparation method of the nanocrystalline scintillator material. The preparation method has the advantages of being simple in process, low in cost, green, free of pollution and capable of achieving large-scale industrial production. The invention further discloses a scintillator film and preparation and application thereof, the scintillation intensity of the scintillator film is 1.3067 times that of a commercial scintillator CsI: T1 wafer, the lowest detection limit is 4.0138 [mu] Gyair / s, the imaging resolution is about 16 lp / mm, and the scintillator film can be effectively applied to the fields of X-ray medical imaging, nondestructive testing, industrial flaw detection and the like.

The invention discloses a NiZnCu ferrite composite metasurface with a P wave band broadband and a low RCS (Radar Cross Section) based on 1-bit coding. Firstly, the impedance matching condition of the ferrite is improved through Mn < 2 + > ion doping, so that when the thickness of the NiZnCu ferrite is 2 mm, effective wave absorption with the reflection loss smaller than-10 dB is achieved within the range of 0.25 GHz to 1.0 GHz. Furthermore, NiZnCu ferrite is combined with a sandwich structure (square metal sheet / FR4 / metal back plate, 6 mm) to construct a 1-bit coding metasurface structure unit, optimal array arrangement is obtained by adopting a genetic algorithm, and directional reflection is reduced to the greatest extent. And finally, full-wave simulation software is used for verification, and the result shows that the NiZnCu ferrite composite coding metasurface can further reduce the RCS by using the diffuse reflection effect on the basis of keeping the ferrite wave absorbing effect, the range of the RCS is 0.50 GHz-0. 75 GHz, and the maximum RCS reduction value can reach 29.4 dB.

The invention provides a chlorine tungsten anion and cation co-doped sodium vanadium phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of energy materials. The positive electrode material is formed by doping V site with W < 4 + > ions and doping (PO4) 3 site with Cl <-> ions, the chemical formula of the positive electrode material is Na < 3-x > V < 2-x > W < x > (PO4) < 3-y > Cl3y / C, x is equal to 0.05, 0.1 and 0.15, and y is equal to 0.09, 0.12 and 0.15; according to the preparation method, ammonium metavanadate, sodium acetate and ammonium dihydrogen phosphate are taken as raw materials, tungsten disulfide and sodium chloride are taken as doping sources, citric acid monohydrate is taken as a chelating agent, and the chlorine tungsten anion and cation co-doped sodium vanadium phosphate electrode material is prepared by a solution gel method, so that the electronic conductivity is improved, and the rate capability and the cycling stability are improved; the preparation method has a good application prospect in sodium ion battery positive electrode materials.

The invention discloses a preparation method of Eu < 3 + >-doped black talc-based high-performance luminescent glass, and the prepared luminescent glass is a novel photoluminescent material matrix and can provide a new expansion space for a rare earth photoluminescent material. The luminescent glass is characterized by comprising the following chemical components in percentage by weight: 90wt% of black talc, 10wt% of CaO and 1-13wt% of Eu2O3. The preparation method comprises the following steps: weighing the three raw materials according to the mass ratio, uniformly mixing in a ceramic mortar, putting into an Al2O3 crucible, putting into a high-temperature muffle furnace, carrying out high-temperature melting at the melting temperature of 1600 DEG C, and keeping the temperature for 2 hours. Pouring the glass melt on a preheated stainless steel mold, placing the mold in a low-temperature muffle furnace for annealing treatment at the annealing temperature of 680 DEG C, and keeping the temperature for 10 hours; and cooling the annealing furnace to room temperature to obtain the black talc-based luminescent glass. According to the invention, a black talc high-value utilization technology is successfully developed, and the prepared luminescent glass can be excited by a 394 nm light source to emit red fluorescence with a fluorescence range of 520-750 nm and a main emission peak of 615 nm, and can be used as a red fluorescent material of a warm white light LED.