326results about "Tin oxides" patented technology

The invention provides anti-ionizing radiation powder with a core-shell heterogeneous gradient structure and a preparation method and application of the anti-ionizing radiation powder, and belongs to the field of radiation protection.The preparation method of the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure comprises the following steps that high-atomic-number metal salt is added into deionized water, aging, washing, drying and primary calcination are conducted in sequence, and the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure is obtained; a core layer is obtained; the core layer and low-atomic-number metal salt are added into deionized water, aging, washing, drying and primary calcination are sequentially conducted, and preliminary wrapping powder with the high-atomic-number metal core layer wrapped by low-atomic-number metal is obtained; and adding the preliminarily wrapped powder and rare earth salt into deionized water, and sequentially performing aging, washing, drying, primary calcining, secondary calcining, airflow crushing and air rotation purging to obtain the anti-ionizing radiation powder with the core-shell heterogeneous gradient structure. Through cooperation of the core-shell heterostructure, the high-atomic-number oxide, the low-atomic-number oxide and the multi-element rare earth element, the shielding performance of the material is remarkably improved.

The invention belongs to the technical field of preparation of sensor materials, and particularly relates to a room-temperature formaldehyde sensor material based on a catalytic principle as well as preparation and application of the room-temperature formaldehyde sensor material. The polyphenol is adsorbed on the surface of the semiconductor metal oxide through chelation, then noble metal ions are introduced, and the polyphenol on the surface of the semiconductor metal oxide can capture the noble metal ions and reduce and stabilize the noble metal ions on the surface of the semiconductor metal oxide; the noble metal nanoparticles are anchored on the surfaces of the semiconductor metal oxide nanoparticles, the original morphology of the semiconductor metal oxide is maintained, and the noble metal nanoparticles are loaded on the surfaces of the semiconductor metal oxide nanoparticles. The nano composite material not only has the intrinsic electrical and thermodynamic properties of semiconductor metal oxide, but also combines the catalytic characteristics of noble metal nanoparticles, so that the lower detection limit of formaldehyde is reduced to 3ppb, and the sensitivity of the sensor is remarkably improved. The preparation method of the room-temperature formaldehyde sensing material is simple and suitable for large-scale production, the raw materials are simple and easy to obtain, the cost is low, and the materials are environment-friendly.

The invention discloses an oxygen-sulfur double-vacancy modified SnO2 / SnS2 / C nano material as well as a preparation method and application thereof, and belongs to the technical field of electrode materials. The preparation method comprises the following steps: mixing a structure regulating agent with tin salt, dropwise adding alkali liquor, stirring, and carrying out suction filtration to obtain Sn6O4 (OH) 4; the preparation method comprises the following steps: adding glucose and polyvinylpyrrolidone into distilled water, stirring to form a uniform solution, adding Sn6O4 (OH) 4 into the uniform solution, stirring, and carrying out ultrasonic and hydrothermal reaction to obtain SnO2 / glucose; and calcining the SnO2 / glucose and a sulfur source in an inert atmosphere to obtain the SnO2 / SnS2 / C nano material modified by oxygen and sulfur double vacancies. The SnO2 / SnS2 / C disclosed by the invention is used for a lithium / sodium ion battery negative electrode, can effectively relieve volume expansion of tin-based oxysulfide and improve the conductivity of an electrode material, and shows high charge-discharge specific capacity, excellent rate capability and high-rate long-cycle stability.

The invention discloses a gas-sensitive material for monitoring an environment-friendly gas characteristic substance CO as well as a preparation method and application thereof, and relates to the technical field of gas-sensitive materials. The preparation method comprises the following steps: dissolving tin tetrachloride pentahydrate, sodium hydroxide and polyvinylpyrrolidone, adding ammonium fluoride, reacting at 155-165 DEG C, drying the product, and calcining at 295-305 DEG C to obtain SnO2 nanoparticles; the preparation method comprises the following steps: performing ultrasonic mixing on SnO2 deionized water dispersion liquid and MoS2 nanosheet ethylene glycol dispersion liquid, and then drying to obtain the MoS2 / SnO2 composite material with a mesoporous hollow nanotube structure, and the volume ratio of ethylene glycol to deionized water is (0.9-1.1): 1. The MoS2 / SnO2 gas sensitive material has the advantages of low density, high pore volume, large specific surface area, high structural stability and the like. And when applied to a CO resistive sensor, the catalyst has good CO selectivity, high sensitivity and good long-term stability.

The invention relates to the technical field of synthesis and preparation of nano materials, in particular to a method for preparing tin dioxide powder, which comprises the following steps: S1, preparing a 0.1-5 mol / L tin salt solution, adding a compound additive into the tin salt solution, and carrying out ball milling treatment after ultrasonic dispersion to obtain a pretreated tin salt solution; s2, freezing and freezing the pretreated tin salt solution in an ultralow-temperature environment to obtain a frozen sample; s3, transferring the frozen sample into a vacuum freeze dryer for dehydration treatment to obtain solid powder; and S4, carrying out high-temperature calcination on the solid powder to obtain tin dioxide powder. Zero sewage discharge is achieved in the preparation process, the problem of sewage discharge and treatment of traditional liquid-phase powder preparation is solved, meanwhile, the phenomenon of sintering agglomeration accompanied by traditional solid-phase calcination can be avoided, high-quality superfine tin dioxide powder preparation is achieved, the method is simple and safe in process, and industrial large-scale production and preparation are easy to achieve.

The invention discloses a Ti / IrO2-SnO2-SbO2 gradient active coating anode with low cost and high stability and a preparation process of the Ti / IrO2-SnO2-SbO2 gradient active coating anode. The gradient active coating is characterized in that the gradient active coating is composed of 3-5 layers, the total thickness is 5-15 microns, the thickness of each layer is 1-5 microns, the molar percentage content of iridium in a bottom layer is 0-5%, the sum of the molar percentage content of tin and antimony is 95-100%, the molar percentage content of iridium in a surface layer is 10-20%, the sum of the molar percentage content of tin and antimony is 80-90%, and the thickness of each layer is 1-5 microns. The molar percentage content of iridium from the bottom layer to the surface layer is sequentially increased from 2% to 10%, the molar percentage content of tin and antimony is sequentially reduced from 2% to 10%, and the total iridium loading amount in the gradient active coating is 0.05-0.2 mg / cm < 2 >. The preparation method comprises the three steps of titanium substrate pretreatment, precursor salt alcohol solution preparation and gradient active coating preparation. By adopting a gradient coating mode, the thermal stress between the coating and the titanium substrate in the preparation process is remarkably reduced, the consumption of noble metal is reduced, the oxygen evolution activity of the anode is improved, and the service life of the anode is prolonged. The method is simple to operate and low in cost, and has remarkable industrialization advantages.

The invention relates to a preparation method of a pectin-derived carbon-coated amorphous tin-zinc composite oxide lithium ion battery negative electrode material. The method comprises the following steps: dropwise adding a tin tetrachloride solution and an acidified zinc oxide solution into a pectin solution to obtain a metal ion-pectin dispersion liquid; adding ammonia water to obtain a pectin precursor solution; freezing and solidifying with liquid nitrogen; and after freeze-drying, roasting for 3-5 hours to obtain the pectin derived carbon coated amorphous tin-zinc composite oxide lithium ion battery negative electrode material. The reversible specific capacity of the obtained composite material reaches 1339 mA h g <-1 > after 100 cycles under the current density of 0.2 A g <-1 >.

The invention discloses a stannic oxide-based ammonia gas sensor as well as a preparation method and application thereof, relates to the technical field of gas sensors, and solves the problems of high detection lower limit, poor gas selectivity and low sensitivity of a traditional semiconductor ammonia gas sensor. A sensitive material based on oxygen vacancy regulation and control SnO2 / ZIF-67 is prepared on the surface of an interdigital gold electrode by adopting a chemical vapor deposition method, a planar electrode, an aluminum oxide ceramic substrate, a heater and a Pt wire are welded and packaged according to a general indirectly-heated gas sensitive element, and the SnO2 / ZIF-67 semiconductor ammonia gas sensor is prepared. The lower detection limit of the SnO2 / ZIF-67 semiconductor ammonia gas sensor is 1 ppm; meanwhile, the NH3 selectivity and sensitivity of the sensor are improved through the synergistic effect of SnO2 and ZIF-67, and the sensor can be used for detecting ammonia gas leakage and can be applied to judging the safety of ammonia gas in chemical production operation, environmental gas detection and other applications.

The invention provides coated SnO and FeOx composite oxide powder and a silver-based composite electric contact material and a preparation method thereof, and the preparation method comprises the following steps: providing stannous mono-sulphate, dissolving, stirring to form a SnSO4 solution, and continuously reacting to obtain a solution A; adding an alkaline reaction solution into the solution A to reach a preset pH value to obtain a precursor solution; performing hydrothermal reaction on the precursor solution; washing and drying a hydrothermal reaction product to obtain SnO powder; the preparation method comprises the following steps: adding FeSO4 or FeCl2 into an aqueous solution containing SnO powder, dissolving, adding H2C2O4 to obtain a precipitate, filtering, separating, and drying; and carrying out vacuum heat treatment on the precipitate to obtain the coated SnO-coated FeOx composite oxide powder. The SnO-coated FeOx composite oxide with a controllable and adjustable valence structure can be formed, and the composite oxide is firstly applied to the field of silver-based composite electric contact, so that the Ag / SnO-coated FeOx composite electric contact material has the performance advantages of low temperature rise, long cycle life and the like in the service process.

The invention provides a composite hard carbon negative electrode material preparation method, which comprises: S1, adding SnCl4. 5H2O to a microcrystalline graphite / phenolic resin hard carbon suspension, and uniformly stirring for 1 h to obtain a mixed solution A; s2, putting the mixed solution A into a high-pressure kettle for hydrothermal reaction, and after the reaction is finished, soaking and washing in deionized water to obtain SnO2 MG / PF hydrogel; and S3, under the protection of inert gas, carrying out evaporation drying treatment on the SnO2 (at) MG / PF hydrogel, and then putting the SnO2 (at) MG / PF hydrogel into a high-temperature furnace for high-temperature treatment to obtain the composite hard carbon negative electrode material. Phenolic resin hard carbon and microcrystalline graphite are compounded and then doped with a certain amount of tin dioxide to obtain the composite hard carbon negative electrode material, and when the composite hard carbon negative electrode material is applied to the sodium-ion battery, the specific capacity, coulombic efficiency, rate and cycle performance of the sodium-ion battery can be improved.

The invention discloses a double-metal gradient diffusion layer modified high-nickel ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: filtering and uniformly dispersing high-nickel ternary positive electrode material powder; introducing inert gas into the atomic layer deposition system, and raising the temperature to a target temperature; respectively preheating the metal precursors A and B to proper temperatures; the preparation method comprises the following steps: sequentially introducing a metal precursor A, precursor water, a metal precursor B and precursor water into a reaction chamber, alternately depositing according to a pulse-reaction-purging sequence, and repeatedly circulating the process to obtain the bimetallic oxide coated high-nickel ternary positive electrode material, and post-annealing treatment. According to the bimetal gradient diffusion layer modified high-nickel ternary positive electrode material prepared by the preparation method disclosed by the invention, the lithium storage performance of the high-nickel ternary material is greatly improved, excellent cycling stability and rate capability are obtained, the coating layer is accurate and controllable, the preparation process is simple, meanwhile, large-batch production can be realized, and relatively high application value is achieved.

The invention discloses a palladium-doped Ir-Sn oxide titanium anode with high catalytic activity and a preparation method of the palladium-doped Ir-Sn oxide titanium anode, and belongs to the technical field of electrolytic anodes. The anode comprises a titanium substrate, a TiO2-Ta2O5 intermediate layer and an Ir-Sn-Pd oxide catalyst layer, the molar ratio of Ir to Sn to Pd in the catalyst layer is (5-6): 3: (1-2), and the total metal ion concentration is 0.3 mol L. The preparation method is realized through titanium substrate pretreatment (sand blasting and etching), intermediate layer coating sintering (a TiCl4-TaCl5 solution) and catalyst layer circulating coating sintering (an H2IrCl6-SnCl4-PdCl2 mixed solution). The relatively cheap palladium element is introduced, the electron structure of the catalyst layer is optimized by utilizing the defect effect, the charge transfer resistance is reduced to 6.7 omegacm, and meanwhile, the iridium consumption is reduced by more than 30%. Experiments show that the cell voltage of the anode is stabilized at 0.95 V (the current density is 5Acm <-2 >), the accelerated life reaches 1630 hours, the coating binding force is 62N, and the corrosion rate in an acidic electrolyte is only 0.01 mm / year. Compared with a traditional iridium tantalum anode, the cost is reduced by 40%, and the overpotential in the oxygen evolution reaction is as low as 0.45 V.

The invention discloses a preparation method and application of a peptide microtube / SnO2 / Au composite gas-sensitive material. The three-dimensional network structure of the peptide microtube is utilized to effectively adsorb SnO2 and Au nanoparticles, so that the SnO2 and Au nanoparticles form a complete connection path on the surface of the peptide microtube, and electron transfer is facilitated; and gas diffusion is also facilitated. The localized surface plasmon resonance (LSPR) effect of Au nanoparticles can enhance visible light absorption and surface reaction activity, so that the gas-sensitive property is improved, and rapid adsorption and desorption reaction can be carried out at room temperature. The prepared sensor exerts the synergistic effect of the three materials, realizes efficient detection of NO2 at room temperature, has very high selectivity to NO2, and has relatively high response to low-concentration NO2, so that trace detection can be carried out.

The invention discloses a nitric acid type system tin stripping liquid centralized recovery treatment process which comprises the following steps: firstly, adding a cationic coagulant into a nitric acid type tin stripping waste liquid, filtering through a 5-micron filter membrane, discharging into a reaction kettle, and adding a H2O2 solution with the concentration of 5-10%; the pH is adjusted to 2.0-2.5, and copper is removed under the condition of 40-50 DEG C; when the pH value is increased from 2.5 to 3.0-3.5, iron is removed; adjusting the pH value to 13.0-13.5, heating to remove aluminum, and separating to obtain a filtrate containing Na2SnO3; adjusting the pH value of the filtrate to 6.0-6.5, heating to 70-75 DEG C for reaction, and then carrying out gradient cooling to room temperature to generate Sn (OH) 4 precipitate; and centrifugally separating the mixed solution to obtain a tin-containing solid and a tin stripping regenerated solution, and firing the tin-containing solid to obtain a tin dioxide solid. Compared with a traditional process, copper is removed firstly, then iron is removed, aluminum is finally removed, and directional removal is achieved through the difference of precipitation conditions.

Disclosed are a doped colloidal metal oxide quantum wire and a preparation method thereof, a gas sensor, a gas sensor array, and use thereof, which relate to the technical field of gas sensors. In the preparation method, a main metal precursor, a doped metal precursor, an alcohol solvent, and a fatty acid surfactant are mixed, and a resulting mixture is subjected to a solvothermal reaction, to obtain the doped colloidal metal oxide quantum wire, wherein a main metal element in the main metal precursor is selected from Sn, Zn, W, In, Mo, Fe, Co, Ni, and Cu; a doped metal element in the doped metal precursor is selected from V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni and Cu; the doped metal element is different from the main metal element; and the solvothermal reaction is performed at a temperature of 150-300° C.

The invention belongs to the technical field of electronic components, and provides a xylene gas sensor based on a Co3O4 and In2O3 heterojunction, and a preparation process and application thereof. The xylene gas sensor comprises a gas sensitive material and an alumina ceramic tube, wherein the gas sensitive material is coated on the surface of the alumina ceramic tube. The gas sensitive material is a nano composite material formed by cobaltosic oxide and indium trioxide. The method is simple in production process, and the obtained gas-sensitive material shows relatively high sensitivity and rapid response and recovery to xylene. Due to the fact that a gas sensor with related achievements is too high in lower limit of detection of to-be-detected gas, the detection performance in a low-concentration environment is not ideal enough. According to the invention, the lower detection limit of the gas sensor can be greatly reduced, and the gas sensor still has obvious response under the concentration of 0.1 ppm, so that xylene in a gas environment can be timely found and protected.

The invention discloses a preparation method of an alpha-Fe2O3 / SnO2 nanoneedle heterojunction gas sensitive material, and belongs to the technical field of preparation and application of inorganic composite materials. Adding a mixed solution of ferric chloride and sodium sulfate and the ceramic tube into a reaction kettle, carrying out hydrothermal reaction at 120-160 DEG C for 10-14 hours, taking out the ceramic tube after the reaction is finished, drying and annealing to obtain a ceramic tube loaded with alpha-Fe2O3 nanoneedles; dissolving tin chloride and urea in water to obtain a mixed solution, adding the mixed solution and the ceramic tube loaded with the alpha-Fe2O3 nanoneedle into a reaction kettle, carrying out hydrothermal reaction at 80-100 DEG C for 1-6 hours, taking out the ceramic tube after the reaction is finished, drying and annealing to obtain the alpha-Fe2O3 / SnO2 nanoneedle composite gas-sensitive material. The preparation method is simple, the product is high in crystallinity and good in stability and is suitable for preparing a high-economical gas sensitive sensor material, and a sensor prepared from the alpha-Fe2O3 / SnO2 nanoneedle heterojunction gas sensitive material can effectively improve the gas sensitive performance of alpha-Fe2O3 and shows an extremely high response value to NO2 while the working temperature is reduced.

The invention provides a Bi-doped SnO catalyst and a preparation method and application thereof, a gas diffusion electrode and a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: mixing divalent metal tin salt, a regulator and bismuth salt in water to obtain a mixed solution; and mixing the mixed solution with a sodium hydroxide solution, and reacting to obtain the Bi-doped SnO catalyst. The preparation method is simple, rapid, low in cost, green and free of organic solvent or high-temperature treatment, and the prepared catalyst is stable in structure and lasting in performance. The Faraday efficiency of a gas diffusion electrode prepared by adopting the Bi-doped SnO catalyst for synthesizing formic acid through electrocatalytic reduction of CO2 at-850 mA / cm < 2 > is as high as 98%, the gas diffusion electrode can stably run for more than 140 h under N2 purging in a solid electrolytic tank, and the concentration of formic acid continuously produced exceeds 5 mol / L.

The invention discloses a negative electrode material for improving the cycle performance of a lithium battery, a preparation method of the negative electrode material, a negative electrode plate and a battery, and the preparation method comprises the following steps: S1, growing SnO2 on a carbon nanotube through a hydrothermal synthesis method to form a one-dimensional composite material SnO2 (at) CNT; s2, Zr ions and a silane coupling agent are introduced into the one-dimensional composite material SnO2 (at) CNT, and the modified SnO2 (at) CNT material is obtained. According to the invention, the cycle life of the lithium battery using the stannic oxide negative electrode material is prolonged through material composite modification.

The invention provides a SnO2 / expanded graphite composite material as well as a preparation method and application thereof, belongs to the technical field of sodium ion batteries, and aims to solve the technical problems of low specific capacity of expanded graphite and unstable SnO2 cycle performance. The preparation method of the SnO2 / expanded graphite composite material comprises the following steps: (1) mixing expandable graphite, soluble tin salt and a solvent to obtain a mixed solution; (2) evaporating the mixed solution to dryness to obtain a graphite intercalation compound; and (3) carrying out microwave heating on the graphite intercalation compound to obtain the SnO2 / expanded graphite composite material. The SnO2 / expanded graphite composite material prepared by the invention is used as a sodium-ion battery negative electrode material, can effectively overcome the defect of poor capacity when a carbon material is independently used and the defects of low conductivity and poor cycle performance when SnO2 is independently used, can synergistically exert the sodium storage advantages of the metal oxide and the expanded graphite, makes up the respective defects, and can be used for preparing the sodium-ion battery negative electrode material. Therefore, the electrochemical performance of the sodium-ion battery is improved.

The invention discloses a preparation method and application of a nano heat-insulating metal oxide composite coating. The preparation method comprises the following steps: preparing a nano ATO crystal of which the surface contains silicon hydroxyl; preparing polymerizable ATO (antimony tin oxide) nano particles; and uniformly mixing the polymerizable ATO nano particles, the silane modified nano silicon dioxide, the self-emulsifying polyurethane emulsion and the auxiliary agent to obtain the required coating. Nanometer ATO crystallization and surface silicon hydroxyl modification are synchronously completed in a hydrothermal environment, and the problem of uneven coating caused by traditional two-step modification is solved; after the high-temperature reaction, cold ethanol is used for realizing shock cooling to stop crystal growth, so that the problem of thermodynamic instability of the nanocrystalline is solved; the interfacial compatibility is improved by introducing a vinyl-containing siloxane monomer; by compounding the polymerizable ATO nano particles, the silane modified nano silicon dioxide, the self-emulsifying polyurethane emulsion and the auxiliaries, a stable topological structure connected by covalent bonds is constructed, and the aging resistance, the heat insulation property and the adhesive force of the coating are remarkably improved.

The invention discloses a nitrogen plasma vapor deposition modified metal oxide catalyst and a preparation method and application thereof.The preparation method of the catalyst comprises the steps that tin salt, CTAB and ammonia water serve as raw materials, SnO2 is prepared through a solution gel method, then the preliminarily-prepared SnO2 is calcined in the air atmosphere, purer SnO2 is prepared, and the catalyst is used for preparing the metal oxide catalyst. And finally, carrying out chemical vapor deposition modification on SnO2 by utilizing high-energy-state N * plasma to prepare the catalyst. The nitrogen-doped tin dioxide catalyst is synthesized on the basis of a chemical vapor deposition method strategy, and the catalyst shows extraordinary performance of electrocatalytic oxygen reduction for synthesis of hydrogen peroxide in an alkaline medium, has good stability and a wide potential window, and has potential application prospects in the field of electrochemical preparation of hydrogen peroxide.

The invention discloses a heterogeneous precipitation preparation process of modified tin oxide powder doped with middle-low-melting-point oxides, and relates to the field of powder metallurgy. The preparation method comprises the following steps: coating bismuth oxide on the surface of tin oxide slurry which is prepared by a traditional acidification method and has the D50 particle size of 0.5-3 microns by utilizing a heterogeneous precipitation method, then calcining at 900-1200 DEG C, carrying out liquid-phase sintering on the tin oxide by utilizing the state of a bismuth oxide liquid phase at the temperature, and then cooling, thereby obtaining the bismuth oxide-tin oxide composite material with the D50 particle size of 0.5-3 microns. The modified tin oxide powder doped with the medium-low-melting-point oxides is spheroidic in morphology and concentrated and uniform in particle size distribution. Compared with tin oxide powder prepared through a traditional acidification tin oxide preparation process, the low-medium-melting-point oxide modified tin oxide powder prepared through the process has the advantages of being more concentrated in particle size distribution, better in particle size uniformity and easier to disperse evenly, and a silver tin oxide material good in uniformity and stable in quality can be prepared easily.

The invention discloses a preparation method and a preparation system of nano metal oxide powder. The preparation method comprises the following steps: adding a batch of metal blocks into a smelting furnace to form metal liquid after smelting, the metal liquid enters a plasma furnace through a connecting pipe, and when the metal liquid levels in the smelting furnace and the plasma furnace reach a set height; turning on a plasma gun arranged on the top of a plasma cover, the plasma gun gasifies the metal liquid in the plasma furnace into gaseous metal, air enters the plasma cover during the gasification process, the gaseous metal and the air undergo oxidation reaction to obtain metal oxide, the metal oxide enters a powder collector driven by the air and is quickly cooled to obtain nano metal oxide; while turning on the plasma gun, metal blocks are added into the smelting furnace through a feeder, and the adding speed of the metal blocks is controlled by the feeder to maintain the metal liquid level change in the smelting furnace and the plasma furnace within ±5 mm.

To provide: a conductive film that is excellent in conductivity and can be stably deposited even on a surface of an organic material; and a method for manufacturing the conductive film.SOLUTION: A conductive film includes tin oxide nanoparticles 21 and tin hydroxide 24, and a proportion of tin hydroxide is in a range of 0.01-0.15 in terms of weight ratio. The tin hydroxide 24 is preferably present so as to fill a cavity between the tin oxide nanoparticles 21. The tin hydroxide 24 is preferably present on a tin oxide nanoparticle layer formed by lamination of the tin oxide nanoparticles 21.SELECTED DRAWING: Figure 2

The invention discloses a lithium ion battery anode material and a preparation method and application thereof, and the preparation method specifically comprises the following steps: (1) adding NaF and SnCl. 2H2O into water, stirring, carrying out a hydrothermal reaction, carrying out suction filtration washing, and drying to obtain a SnO2-x anode material; and (2) grinding and mixing the SnO2-x anode material and a carbon material to obtain the SnO2-x anode material. The lithium ion battery anode material provided by the invention has higher specific capacity and excellent rate capability, solves the problem of poor cycling stability caused by insufficient conductivity and volume expansion of the traditional SnO2 anode material, and has extremely potential production potential and practical application value.

The present invention relates to a process for producing dipentaerythritol from pentaerythritol in the presence of sulfolane and a heterogeneous polyacid catalyst supported on a carrier comprising a compound selected from the group consisting of: SnO2, mesoporous silica, and zeolite.

A modified metal oxide particle sol, when applied as a coating onto a substrate, is capable of having transparency, a high particle refractive index and good coat resistivity. The modified metal oxide particle sol is composed of modified metal oxide particles (iii) in which stannic oxide particles (i) having an average primary particle size of 4 to 50 nm serve as cores and are coated with metal oxide particles (ii) of at least one metal oxide selected from the group consisting of antimony oxide, stannic oxide and silicon oxide and having an average primary particle size of 1 to 10 nm, which modified metal oxide particles (iii) are dispersed in an organic solvent. The average primary particle size of the core particles (i) and the average primary particle size of the coating particles (ii) satisfy the relationshipsize of core particles(i)≥size of coating particles(ii),the ratio (total weight of metal oxides other than stannic oxide) / (weight of stannic oxide) is from 0.005 to 1.0, and the sol includes an amine (a) having a water solubility of 0.1 g / L or more and an amine (b) having a water solubility of less than 0.1 g / L.

The invention discloses a multi-dimensional carbon structure negative electrode material, and belongs to the field of lithium battery materials. The multi-dimensional carbon structure negative electrode material comprises a core layer, a middle layer and a shell layer which are sequentially arranged from inside to outside, the core layer comprises a three-dimensional conductive skeleton loaded with active particles; the material of the middle layer comprises amorphous carbon; the material of the shell layer comprises a metal oxide. The negative electrode material with the core-shell structure is obtained by preparing the multi-layer structure containing the core layer, the middle layer and the outer layer and optimizing the material of each layer. The outer layer and the middle layer can effectively inhibit disordered deposition of metal lithium on the outer surface, active particles of the core layer serve as lithium-loving sites to guide lithium to be nucleated and deposited in fiber coils preferentially, the uniformity and directionality of lithium deposition can be improved through cooperation of the three layers, and therefore growth of lithium dendrites is effectively inhibited; and the safety performance and the cycling stability of the prepared battery are enhanced.

The invention discloses a PEDOT: PSS thermoelectric composite film and a preparation method and application thereof, and belongs to the technical field of flexible thermoelectric material preparation. The preparation method comprises the following steps: dissolving SnCl2.H2O particles in distilled water, stirring, adding flaky NaOH, stirring, carrying out a hydrothermal reaction on a mixed solution, carrying out centrifugal washing on a hydrothermal product, and drying to obtain SnO2 nanosheets; the preparation method comprises the following steps: sequentially adding a polar solvent, SnO2 nanosheets and distilled water into a PEDOT: PSS aqueous solution, stirring and oscillating to obtain a PEDOT: PSS mixed solution, dropwise adding the mixed solution onto a glass substrate, and drying to obtain a PEDOT: PSS thermoelectric composite film; then placing the film on a hot plate, placing metal wires at the two ends of the film respectively, dropwise adding conductive silver adhesive at the contact positions of the metal wires and the film, curing the conductive silver adhesive through heating so as to enable the metal wires to be connected with the PEDOT: PSS thermoelectric composite film, and after simulated sunlight irradiation, increasing S and reducing sigma by less than 2% so as to obtain the sigma and S decoupled PEDOT: PSS thermoelectric composite film. And decoupling of sigma and S in the thermoelectric composite film is realized.