392results about How to "Increase layer spacing" patented technology

The invention discloses an organized zirconium phosphate modifier based on waste plastic derivatives, an anti-aging asphalt-based material and a preparation method of the organized zirconium phosphate modifier and the anti-aging asphalt-based material, and belongs to the field of preparation of building materials.The organized zirconium phosphate modifier based on the waste plastic derivatives is added into asphalt, and the organized zirconium phosphate modifier has a layered structure, so that the anti-aging asphalt-based material is prepared; ultraviolet rays can be effectively absorbed, and the ultraviolet aging resistance of the asphalt is greatly improved. In addition, a large number of active sites also exist on the surface of zirconium phosphate, the effect of capturing free radicals can be achieved, the free radicals are prevented from participating in the oxidation reaction, and therefore a certain anti-oxidation function is achieved.

The invention discloses a preparation method and application of heteroatom-doped asphalt-based hard carbon, and relates to the field of sodium-ion battery negative electrode materials. The preparation method comprises the following steps: mixing asphalt with a catalyst, a cross-linking agent and a solvent, and performing cross-linking modification in a reflux state to obtain a liquid precursor I; heating and pre-carbonizing the precursor I in air to obtain a precursor II; and washing the precursor II to be neutral, drying, and performing high-temperature carbonization in inert gas to obtain the heteroatom-doped asphalt-based hard carbon material. Asphalt is used as a precursor, chemical crosslinking and doping methods are used, Friedel-Crafts reaction of the asphalt is realized, and a large number of oxygen-containing functional groups and other heteroatoms are introduced. In the high-temperature carbonization process, the introduced oxygen-containing functional group and other heteroatoms can weaken or destroy the pi-pi interaction between asphalt aromatic hydrocarbons and inhibit the graphitization of asphalt of the asphalt-based carbon material, so that the carbon material forms a three-dimensional cross-linked structure, the interlayer spacing is increased, the closed pore volume is increased, and the capacity, the cycle performance and the rate capability are further improved.

The invention relates to the technical field of cutter manufacturing, in particular to a high-strength and high-toughness ceramic cutter and a preparation method thereof. The metal ions are loaded on the boron nitride nanosheets, the agglomeration phenomenon of the boron nitride nanosheets can be improved through loading of the metal ions, the interaction force between the boron nitride nanosheets is enhanced, and therefore the mechanical strength of boron nitride is improved. According to the preparation method disclosed by the invention, a complex with adhesion is formed on a boron nitride nanosheet by utilizing the chelation of tannic acid and iron ions, and boron nitride loaded with the iron ions and modified hydrotalcite are adhered together by utilizing the adhesion of the complex. The prepared modified soybean protein has a large number of amino groups, the boron nitride-hydrotalcite compound with the amino groups has better compatibility with a modified soybean protein binder, the dispersity of the boron nitride-hydrotalcite compound in a matrix is improved, and the strength and toughness of the ceramic cutting tool are improved.

The invention provides a lithium-mixed coated modified ternary positive electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium battery raw materials. Various lithium sources are mixed according to a certain proportion to prepare a ternary positive electrode, co-doping modification is carried out through cooperation of Li3PO4 and a W / Al / Zr / Y / B-containing compound, double-layer coating modification is carried out through cooperation of the Li3PO4 and a Ti / Al-containing compound for primary coating and cooperation of an anhydrous Li compound and TiP2O7 or Ti3 (PO4) 4 for secondary coating, and a double-gradient fast ion conductor coating layer is constructed. The structural stability, the thermal stability, the first discharge capacity and efficiency, the multiplying power, the circulation and storage performance and the like of the single-crystal or polycrystal ternary positive electrode material under different voltage and power conditions are improved; the lithium-mixed multi-element composite ternary positive electrode provided by the invention has the advantages of more stable layered structure, higher safety, higher electronic conductivity, better multiplying power, high specific capacity and long cycle performance.

The invention relates to the technical field of formaldehyde adsorption, in particular to a preparation method of modified activated carbon for removing formaldehyde, which comprises the following steps: S1, performing acidification pretreatment on coconut shell charcoal, and grafting the pretreated coconut shell charcoal with polyethyleneimine to obtain activated carbon loaded with polyethyleneimine; s2, carrying out dipping treatment and cyclohexanol treatment on the activated carbon loaded with polyethyleneimine to obtain functionalized activated carbon; s3, reacting the magnesium-aluminum hydrotalcite with a quaternary ammonium salt solution and a sodium benzenesulfonate solution to obtain modified hydrotalcite; reacting the modified hydrotalcite with a vinyl silane coupling agent to obtain vinyl hydrotalcite; s4, the vinyl hydrotalcite and 4-amino-3-hydrazino-5-sulfydryl-triazole are subjected to a reaction, and secondary modified hydrotalcite is obtained; and S5, dispersing the secondary modified hydrotalcite and the functionalized activated carbon in water, and adding glutaraldehyde to obtain the modified activated carbon. The modified activated carbon prepared by the preparation method disclosed by the invention realizes selective recognition, efficient adsorption and catalytic degradation of formaldehyde.

The invention relates to the technical field of electrode materials, in particular to a negative active material and a preparation method thereof, a negative pole piece, a secondary battery or capacitor and an electric energy storage system. The negative electrode active material provided by the invention comprises supported molybdenum disulfide and a carbon nanotube, the supported molybdenum disulfide comprises a reduced graphene oxide carrier and modified molybdenum disulfide loaded on the reduced graphene oxide carrier, the modified molybdenum disulfide comprises molybdenum disulfide and nitrogen-doped carbon, the molybdenum disulfide has a layered structure, and the nitrogen-doped carbon is inserted between layers of the molybdenum disulfide; wherein carbon nanotubes are filled between lamellas of at least part of the supported molybdenum disulfide; the reduced graphene oxide carrier and the carbon nanotubes are provided with etched holes. The negative electrode active material provided by the invention can effectively relieve the problems of volume change and structural collapse of the electrode material in the charge-discharge process, and improve the structural stability and conductivity, so that the capacity and cycle performance of the secondary battery can be effectively improved.

The invention relates to the field of high polymer materials, and discloses an environment-friendly building energy-saving sound insulation material and a preparation method thereof.The environment-friendly building energy-saving sound insulation material is prepared from, by weight, 100-120 parts of modified polyether polyol, 140-150 parts of isocyanate, 8-12 parts of modified hollow glass beads, 5-8 parts of modified sericite, 3-5 parts of ammonium polyphosphate, 2-4 parts of foaming agent, 1-3 parts of stabilizer and 0.1-0.5 part of catalyst; the modified polyether polyol is polyether polyol containing phosphorus and a phase change energy storage chain segment, the modified hollow glass beads are composite coupling agent surface modified hollow glass beads, the modified sericite is triazine flame retardant intercalation modified sericite, and the triazine flame retardant is a triazine derivative containing a siloxane structure and a DOPO structure. The rigid foaming polyurethane material is prepared from the modified polyether polyol and the isocyanate, and the modified hollow glass beads, the modified sericite and the ammonium polyphosphate are added, so that the material has excellent heat insulation and flame retardant properties and also has good mechanical properties.

The invention relates to the field of lithium ion battery materials, and particularly discloses a composite positive electrode material as well as a preparation method and application thereof. The composite positive electrode material comprises a positive electrode active material and a coating material coated on the surface of the positive electrode active material, lithium iron phosphate is used as a basic raw material, and the positive electrode active material is prepared by doping rare earth elements and non-metallic elements; the surface of the positive active matter is coated with a layer of mixture which takes sulfide solid electrolyte, a conductive agent and lithium salt as raw materials, interface impedance is effectively reduced through element doping and surface coating, the interlayer spacing of the material is increased, and the diffusion rate of lithium ions is improved, so that the lithium ion battery also has good electrical properties in a wide temperature range. According to the technical scheme, the problems that in the prior art, the charging and discharging efficiency of a lithium battery is reduced in a high / low-temperature environment, the battery capacity is attenuated, and the cycle performance and the service life of the battery are affected are effectively solved.

The invention belongs to the field of new energy materials and devices, and particularly discloses nitrogen self-doped phenolic resin-based hard carbon microspheres and a preparation method and application thereof.The preparation method comprises the following steps that nitrogen-containing phenol monomers, aldehyde monomers and a basic catalyst are mixed according to a certain sequence, and after prepolymerization is conducted at the low temperature, the nitrogen self-doped phenolic resin-based hard carbon microspheres are obtained; carrying out high-temperature hydrothermal reaction to obtain phenolic resin microspheres; and sequentially carrying out low-temperature carbonization treatment and high-temperature carbonization treatment to obtain the nitrogen self-doped phenolic resin-based hard carbon microspheres. Compared with the existing nitrogen-doped resin hard carbon preparation method, the nitrogen-self-doped phenolic resin hard carbon has the advantages that a nitrogen source is introduced into the phenolic resin hard carbon from the source end of the resin, the production process is simplified, and uniform distribution and atomic-scale doping of the nitrogen element are realized. The material is used for sodium ion batteries, has excellent long cycle stability, good rate capability and high specific capacity, and has industrial application prospects.

The invention relates to the technical field of hydrogel, in particular to attapulgite-based hydrogel and a preparation method thereof. The hydrogel is prepared by polymerizing an alkenyl monomer and modified attapulgite, and the modified attapulgite is obtained by modifying attapulgite with branched acrylate quaternary ammonium salt. The hydrogel shows excellent water absorption, water retention and mechanical properties. The water absorption rate reaches up to 292%, the water retention capacity is excellent in the low-humidity environment, water can be kept for a long time in the drought or low-humidity environment, the continuous water supply capacity is remarkably improved, and the water retention agent is suitable for the fields of agriculture, soil improvement and ecological restoration.

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 relates to a hard carbon material and a preparation method thereof, a negative pole piece and a battery. The preparation method of the hard carbon material comprises the following steps: carrying out pre-oxidation treatment on a plastic precursor to obtain pre-oxidized plastic; adding the obtained pre-oxidized plastic into a mixed solution of deionized water and alcohol, then adding 2, 6-dipicolinic acid, and carrying out a cross-linking reaction to obtain a plastic-based resin carbon precursor; and carbonizing the obtained plastic-based resin carbon precursor at high temperature to obtain the hard carbon material. The hard carbon material prepared by using the preparation process of the hard carbon material provided by the invention is stable in structure, and shows good sodium storage capacity and excellent rate and cycle performance.

The invention provides asphalt-based hard carbon microspheres, a preparation method thereof and a sodium ion battery. The preparation method comprises the following steps: S1, stirring asphalt and basic zinc carbonate microspheres in a solvent for reaction to obtain an asphalt-based carbon microsphere precursor; s2, mixing the asphalt-based carbon microsphere precursor with a metal salt modifier to obtain a modified asphalt-based carbon microsphere precursor; the metal salt modifier is zinc salt, magnesium salt or calcium salt; s3, annealing and carbonizing the modified asphalt-based carbon microsphere precursor; and S4, carrying out acid pickling, water washing and drying treatment on the carbonized product to obtain the asphalt-based hard carbon microspheres. Through the combined action of a template method and the metal salt modifier, the pore structure and morphology of the hard carbon material are improved, so that the hard carbon material has high specific surface area and rich pore structures, and the obtained hard carbon material has excellent performance, high discharge capacity and high initial charge-discharge efficiency.

The invention discloses an atmospheric pressure cold plasma modified lithium-rich manganese oxide positive electrode material as well as a preparation method and application thereof, and relates to the technical field of preparation of lithium ion battery positive electrode materials, the chemical formula of the material is Li1. 2Ni0. 132Co0. 172Mn0. 492 O2, the preparation method comprises the following steps: treating the lithium-rich manganese oxide positive electrode material by adopting plasma, and preparing the atmospheric pressure cold plasma modified lithium-rich manganese oxide positive electrode material. Through plasma discharge treatment, the content of oxygen vacancies on the lithium-rich manganese surface is increased, and the lithium-rich manganese oxide positive electrode material with high capacity, high rate and excellent cycle performance is obtained. The invention solves the problem of complex modification process of the existing lithium-manganese-rich positive electrode material.

The invention belongs to the technical field of lithium cobalt oxide positive electrodes, and discloses a high-entropy doped lithium cobalt oxide positive electrode material as well as a preparation method and application thereof. The molecular formula of the high-entropy doped lithium cobalt oxide positive electrode material is LiCo (1-y) MgxAlyPrzTi (0.0025) O2 or LiCo (1-y) MgxAlyNdzTi (0.0025) O2, x is greater than or equal to 0.001 and less than or equal to 0.01, y is greater than or equal to 0.001 and less than or equal to 0.01, and z is greater than or equal to 0.001 and less than or equal to 0.01. The high-entropy doped lithium cobalt oxide positive electrode material disclosed by the invention is formed by combining a surface integration layer and bulk phase doping, so that irreversible transformation of a material structure from an O3 phase to an O1-O3 blended phase (H1-3) is inhibited, and slippage of a transition metal layer and collapse and irreversible phase transformation of an O3 lattice structure are prevented; the stability of a surface interface and a bulk phase structure of the lithium cobalt oxide positive electrode material under high voltage is improved, and the lithium cobalt oxide positive electrode material can be applied to a lithium ion battery.

The invention relates to a preparation method of a biomass hard carbon negative electrode material and application of the biomass hard carbon negative electrode material in the field of energy storage. The method comprises the following steps: carrying out pretreatment, crushing and pre-carbonization treatment on a biomass raw material to obtain a pre-carbonized material; mixing and stirring the pre-carbonized material and an acid solution, washing and drying to obtain an acid-treated hard carbon material; soaking the obtained acid-treated hard carbon material in an alkaline solution, heating and stirring, washing and drying to obtain an alkali-treated hard carbon material; mixing the obtained alkali-treated hard carbon material with a pore-forming agent, carrying out ball milling, carrying out solid-liquid separation, and carrying out high-temperature carbonization and grinding on the obtained solid phase to obtain a powder sample; and mixing the obtained powder sample with hydrofluoric acid, and carrying out hydrothermal treatment to obtain the biomass hard carbon negative electrode material. The sodium ion battery prepared by taking the biomass hard carbon negative electrode material as a negative electrode material has the characteristics of high initial coulombic efficiency, high low-voltage platform specific capacity and excellent cycle performance and rate capability.

The invention discloses a preparation method and application of a boron and fluorine co-doped potassium ion battery positive electrode material, the chemical formula of the boron and fluorine co-doped potassium ion battery positive electrode material is K < 0.5 > Mn < 0.73 > Ni < 0.22 > B < 0.05 > F < 0.05 > O < 1.95 >, bond energy of O-O and TM-O is changed through introduction of boron and fluorine, TM atom spacing is reduced, and interlayer spacing is increased, so that a wider ion transmission channel can be provided, and the service life of the battery is prolonged. And structural deformation is inhibited. In addition, introduction of boron and fluorine inhibits irreversible release of oxygen anions, and side reactions are reduced. The crystal structure of the manganese-based layered metal oxide positive electrode material is synergistically regulated by anions and cations, so that the prepared boron and fluorine co-doped potassium ion battery positive electrode material has good cycling stability and excellent rate capability.

The invention relates to the technical field of sodium ion battery negative electrode materials, and discloses an in-situ doped pre-oxidized heavy organic matter hard carbon preparation method which comprises the following steps: step 1, low-temperature oxidation: obtaining a pre-oxidized carbon material after heat treatment is finished; step 2, element doping: obtaining a hard carbon precursor doped with a sulfur element; step 3, low-temperature curing: obtaining a cured sulfur element doped pre-oxidized heavy organic matter hard carbon precursor; step 4, high-temperature carbonization: obtaining a sulfur element doped pre-oxidized heavy organic matter hard carbon precursor material with a stable structure; the medium-temperature coal pitch is oxidized at low temperature to obtain the pre-oxidized carbon material, then the sulfur element doped material reacts with the medium-temperature coal pitch at low temperature, hydrogen ions of the medium-temperature coal pitch are substituted by sulfur to form relatively stable chemical bonds, and the continuity of the chemical bonds is beneficial to enhancing the stability of the structure; sulfur atom doping not only provides active sites and increases sodium storage capacity, but also expands interlayer spacing and improves rate capability.

The invention discloses a cooling anti-radiation coating and a preparation method thereof. The cooling anti-radiation coating comprises a surface coating, a middle coating and a bottom coating, the surface coating comprises the following components in percentage by weight: 40-60% of polyethylene, 1-5% of carbon nanotubes, 1-5% of graphene oxide, 10-15% of a dispersant, 5-8% of polyethylene glycol, 3-8% of nano barium oxide and 3-10% of nano boron nitride. The intermediate coating comprises the following components in percentage by weight: 50%-70% of polyurethane, 20%-30% of a silane coupling agent and 5%-10% of aluminum oxide; the bottom coating comprises the following components in percentage by weight: 70%-80% of resin, 7%-9% of talcum powder, 2%-4% of aluminum oxide and 3%-10% of hydroxyethyl cellulose. The cooling anti-radiation coating formed by the synergistic cooperation of the components has high electromagnetic shielding performance and long service life.

The invention relates to the technical field of adhesive films, in particular to a deacidification type EVA film for solar cells and a preparation method of the deacidification type EVA film, and the deacidification type EVA film comprises the following raw materials: EVA resin, a main cross-linking agent, an auxiliary cross-linking agent, aminated anti-PID composite filler, a composite hydrotalcite deacidification agent, a lubricant, an ultraviolet light absorber, a light stabilizer, an antioxidant and a coupling agent. Phosphate ions are inserted between layers of magnesium-aluminum hydrotalcite, and nano titanium dioxide particles are loaded on the surface of the magnesium-aluminum hydrotalcite, so that the obtained composite hydrotalcite acid remover can effectively adsorb and capture acetic acid released from an EVA (Ethylene-Vinyl Acetate) film, and the purpose of effectively removing and inhibiting acid is achieved; through preparation and amination modification of the anti-PID composite filler, the obtained amination anti-PID composite filler can improve the mechanical property and the anti-PID capability of the EVA film, can capture free acetic acid in the EVA film and neutralize the free acetic acid into salt, further plays a role in deacidification, and improves the aging resistance of the EVA film.

A preparation method and application of a coal tar pitch-based hard carbon material, which belongs to the field of metal ion battery negative electrode materials. Based on solid phase heat treatment, an anhydride substance rich in halogen atoms such as Br, F, Cl, and I is mixed with coal tar pitch, and a hard carbon negative electrode material is obtained by high temperature thermal field driven dehydrogenation and crosslinking. Thanks to the regulation of the anhydride substance on the microcrystalline structure and pore structure of the carbon material, the hard carbon material has a high conductivity at 30 mA·g ‑1 The first charge capacity of the sodium storage device was 330.33 mAh g ‑1 The first coulombic efficiency was 77.29%, and it also had good cycle stability and rate performance. The preparation method of this hard carbon material is simple, low-cost, and easy to scale up, laying the foundation for the large-scale preparation of negative electrode materials for sodium ion batteries.

The invention discloses a metal monatomic supported sodium ion battery negative electrode material and a preparation method thereof. The preparation method of the negative electrode material comprises the following steps: roasting a biomass source into hard carbon, preparing a precursor-containing mixture, preparing a non-metal heteroatom doped hard carbon material, decorating metal monatomic, dipping, washing and drying. The preliminarily synthesized biomass carbon source hard carbon material is subjected to step-by-step monatomic point modification, so that the interlayer spacing of graphite nano domains is effectively increased, the functional group structure and concentration of defects are optimized, and the diffusion kinetic energy barrier of sodium ions in the hard carbon material is reduced. Tests show that the sodium-ion battery prepared from the metal monatomic-loaded sodium-ion battery negative electrode material prepared by the invention has the capacity up to 342mAh / g, the first-week coulombic efficiency up to 91.2% and the capacity retention rate exceeding 95% after 200-week charging and discharging at 0.1 C. The preparation method disclosed by the invention is very simple and excellent in effect, and can be widely applied to the fields of lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries, lithium ion batteries and lithium ion batteries. The large-scale commercial popularization of the sodium ion battery is favorably promoted to a great extent.

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 discloses a calcium sulfate whisker reinforced PVC (polyvinyl chloride) board and a preparation process thereof, and relates to the technical field of PVC boards. The calcium sulfate whiskers are introduced into the PVC material, the density of the calcium sulfate whiskers is low, the weight of a PVC board can be reduced, the calcium sulfate whiskers show excellent stability under the high-temperature condition, and the heat stability of PVC can be improved. Ferroferric oxide is loaded on graphene oxide, the flame retardance of graphene is improved, then chitosan is used for conducting intercalation treatment on graphene, the interlayer spacing of graphene loaded with ferroferric oxide is increased, the graphene has the larger specific surface area, and a calcium sulfate whisker-nano-copper compound can be loaded; the dispersity of the calcium sulfate whisker-nano-copper compound is improved, so that the mechanical property and flame retardance of the PVC board are enhanced.

The invention provides a composite positive electrode material, a preparation method thereof, a positive electrode plate containing the composite positive electrode material, a battery and an electric device. The composite positive electrode material comprises a positive electrode active material and a coating layer, the coating layer coats at least part of the surface of the positive electrode active material, the coating layer comprises a composite material, the composite material comprises particles containing an M simple substance and a lithium ion conductor material attached to the surfaces of the particles containing the M simple substance, and M comprises at least one of S, Se and Te.

The invention relates to the technical field of batteries, in particular to a modified hard carbon material, a preparation method thereof, a negative plate and a battery. A modified hard carbon material comprises a carbon matrix and doping elements, the doping elements are distributed among carbon layers of the carbon matrix, and the doping elements comprise an N element; the modified hard carbon material is obtained by heat treatment of a carbon source modified by a modifier, and the modifier comprises poly (diallyldimethylammonium chloride). The preparation method of the modified hard carbon material comprises the following steps: mixing a carbon source solution and a modifier to obtain a mixture; mixing the mixture with a solvent, reacting at a first temperature for a first time, and drying to obtain a precursor; performing heat treatment on the precursor to obtain a modified hard carbon material; wherein the modifier comprises poly (diallyldimethylammonium chloride). The problems of low initial efficiency, low capacity and the like of the existing hard carbon material can be relieved, and the reversible specific capacity, the initial efficiency and the cycling stability of the hard carbon material can be obviously improved.

The invention relates to the field of filter bags, and discloses a polyester fiber pe filter bag which is prepared by needling modified polyester fibers and natural fibers, and the modified polyester fibers are prepared by mixing polyester chips and modified graphene oxide to prepare modified polyester master batches and then carrying out melt spinning; the modified graphene oxide is prepared by grafting a modified silane coupling agent and a component III on the surface of graphene oxide; the modified silane coupling agent is prepared by reacting 2-octenyl succinic anhydride with 1, 1, 3, 3-tetramethyldisiloxane, then reacting with diisopropanolamine to obtain a component II, and then further reacting with vinyltriethoxysilane; the component III is prepared by copolymerizing methacrylic acid-2-hydroxyethyl phosphate, dodecafluoroheptyl methacrylate and gamma-methacryloxypropyltrimethoxysilane under the action of an initiator; and due to the addition of modified graphene oxide, the filter bag has excellent high temperature resistance, acid and alkali corrosion resistance, wear resistance, water resistance and flame retardance.

The invention belongs to the technical field of battery materials, and particularly relates to a sodium ion battery positive electrode material and a preparation method and application thereof. The preparation method of the sodium ion battery positive electrode material provided by the invention comprises the following steps: 1) mixing a sodium source, a precursor and a hexavalent tellurium source, and carrying out first calcination to obtain a first calcined material; and 2) mixing the first calcined material obtained in the step 1), a metal selenium compound and an organic solvent, and performing second calcination to obtain the sodium-ion battery positive electrode material. The structure and interface stability of the material are effectively enhanced through a three-in-one modification strategy of doping the high-valence element Te6 + coating the metal selenium compound and adjusting the microstructure, and the obtained sodium ion battery positive electrode material is stable in structure, stable in interface and good in redox reversibility and has good rate capability and cycle performance.

The invention belongs to the technical field of battery materials, and particularly relates to a modified high-nickel ternary positive electrode material and a preparation method and application thereof. The preparation method of the modified high-nickel ternary positive electrode material provided by the invention comprises the following steps: 1) mixing a lithium source, a precursor, a tellurium source and a divalent metal compound, and performing first calcination to obtain a first calcined product; (2) dissolving tellurate in an organic solvent, mixing and grinding the formed tellurate organic solvent solution and the first burning product obtained in the step (1), and then carrying out second burning to obtain a second burning product; the tellurate is selected from at least one of potassium tellurite and sodium tellurite; and (3) washing the secondary calcined product obtained in the step (2) with water, mixing with boric acid, and carrying out third calcination to obtain the modified high-nickel ternary positive electrode material. Through the specific preparation method and the synergistic effect among the steps, the obtained modified high-nickel ternary positive electrode material has good specific capacity, first effect and cycle performance.

The invention discloses a high-rate-performance sodium ion battery positive electrode material and a preparation method and application thereof.The preparation method comprises the steps that a Na source, a Ni source, a Mn source, a Sn source, a Li source and a Ti source are mixed to be uniform, and a first substance is obtained; and sintering the first substance in an air atmosphere at 900-1000 DEG C for 1-12 hours, and cooling along with a furnace to obtain the high-rate-performance sodium ion battery positive electrode material. The high-rate-performance sodium-ion battery positive electrode material is a Li and Ti co-doped nickel-manganese-tin layered oxide positive electrode material, and the rate performance and the cycling stability of the sodium-ion battery are remarkably improved through the Li and Ti co-doping synergistic effect. The sodium-ion battery prepared from the high-rate-performance sodium-ion battery positive electrode material has high rate performance and high cycle stability, and has potential application value in sodium-ion batteries, especially fast-charging solid-state sodium-ion batteries.