226results about "Metal silicides" patented technology

A Si alloy powder for a negative electrode, the Si alloy powder including: a Si phase; a SiX compound phase; and at least one selected from the group consisting of a SnY compound phase and a AlY compound phase, in which the element Y in the SnY compound phase and the AlY compound phase includes at least one element selected from the group consisting of Cu, Fe, Ni, Cr, Co, Mn, Zr, and Ti, the Si alloy powder has an average particle diameter of 30 μm or less, and an amount of the Si phase in an entire Si alloy is 30 mass % to 95 mass %.

The invention relates to the field of batteries, in particular to an asphalt-based sodium ion electrode hard carbon negative electrode material and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing hafnium silicide powder; step 2, preparing hafnium silicide amp; cobalt selenide composite microspheres; step 3, performing amp treatment on hafnium silicide; mixing the cobalt selenide composite microspheres, reduced graphene oxide and asphalt, and performing ball milling treatment to obtain an asphalt-based mixture; and 4, placing the asphalt-based mixture in a graphite furnace, introducing nitrogen as a protective gas, carrying out heating treatment, and cooling to obtain the hard carbon negative electrode material. According to the invention, hafnium silicide amp is used; the sodium ion electrode hard carbon negative electrode material is prepared by taking sodium selenide, cobalt selenide composite microspheres, reduced graphene oxide and asphalt as raw materials, and the negative electrode material not only has excellent performance in the aspects of specific capacity and coulombic efficiency, but also has the advantage of long cycle life.

The invention belongs to the technical field of lithium ion battery materials, and relates to a preparation method and application of an yttrium-doped porous silicon material, and the preparation method comprises the following steps: S1, preparing a silicon-yttrium alloy precursor; s2, mixing the silicon-yttrium alloy precursor with magnesium powder, and performing heat treatment; s3, nitridation reaction; and S4, carrying out acid etching. According to the YSi2 fine grain reinforced porous silicon-based material provided by the invention, a fine grain strengthening mechanism caused by grain boundary segregation in a structural material is introduced into a silicon negative electrode material, so that the intrinsic strength of the silicon material is improved, pulverization and crack propagation of the material are inhibited, and excellent cycle performance and outstanding rate capability are obtained; the invention provides a novel fine grain reinforced silicon negative electrode model, provides theoretical and experimental guidance for research and development of high-strength and high-specific-energy battery materials, solves the problems of low intrinsic strength, large volume expansion and poor conductivity of the silicon negative electrode material, and has the advantages of simple preparation process, short period, low energy consumption and no carbon, and can be produced on a large scale.

This disclosure relates to an electrochemically active material and batteries containing the same. The electrochemically active material comprises an alloy represented by the formula SiaAlbTicNdOeXf wherein X comprises one or more of carbon, a transition metal, and tin, wherein a+b+c+d+e+f = 100, wherein a ˃ 25, b > 0, c ≥ 0, d > 0, d ≥ b, e ≥ 0, f ≥ 0, wherein a+b+c ˃ d, d+(2 / 3e) > b, b+c > d, and wherein the alloy includes an inactive phase comprising aluminum.

Methods of forming a molybdenum silicide layer on a surface of a substrate are disclosed. The method includes disposing a substrate within a reaction chamber, depositing a molybdenum metal layer on a surface of the substrate, and contacting the surface of the molybdenum metal layer with a silicon-containing gas, thereby converting at least a portion of the molybdenum metal layer to a molybdenum silicide layer.

The invention discloses a topology enhanced three-dimensional porous framework lithium-based metal negative electrode material as well as a preparation method and application thereof, and belongs to the technical field of solid-state lithium batteries. The material comprises a three-dimensional porous conductive skeleton and an electrochemical active lithium-based phase, pores of the three-dimensional porous conductive skeleton are filled with the electrochemical active lithium-based phase, and tight physical and electrochemical contact is formed; the three-dimensional porous conductive framework is provided with a lithium-loving surface; the three-dimensional porous conductive skeleton has a Young modulus greater than 10 GPa; and the electrochemical active lithium-based phase is pure lithium metal or lithium alloy. The three-dimensional skeleton can effectively buffer the volume change of active lithium in the charging and discharging process, inhibit the growth of lithium dendrites, provide rapid lithium ion and electron transmission channels and bear external pressure. The all-solid-state lithium battery adopting the negative electrode material shows excellent cycling stability, high critical current density, high rate performance and nearly zero macroscopic volume change, and the comprehensive electrochemical performance and safety of the all-solid-state lithium battery are remarkably improved.

Methods for producing uranium silicide for use as a nuclear fuel. In a first method, a powder composition (optionally in the form of a pellet) comprising uranium dioxide, silicon carbide, and carbon i

To enhance charge and discharge properties of a porous silicon material.SOLUTION: A porous silicon material disclosed herein comprises Si, Al, and a transition metal element M, has a specific surface area of 30 cm2 / g or less according to nitrogen adsorption, is in particulate form, and has a carbon coating layer on the surface.SELECTED DRAWING: Figure 1

The invention discloses a Joule thermal preparation method of a silicon-based composite material compounded by a silicon-based phase and a metal phase and application of the Joule thermal preparation method in a lithium ion battery, and relates to the technical field of lithium ion battery negative electrode materials, and the Joule thermal preparation method specifically comprises the following steps: S1, obtaining a silicon-based original material compounded by the silicon-based phase and the metal phase by adopting a suspension smelting and rapid quenching technology; s2, mixing the silicon-based original material with a conductive agent, and obtaining a silicon-based original material-conductive agent powder material through a sanding technology; and S3, placing the silicon-based original material-conductive agent powder material in rolled carbon paper, clamping the carbon paper at two ends of an electrode, introducing current, raising the temperature of the carbon paper to the highest temperature within a certain time through Joule heat generated by pulse discharge, and preparing the silicon-based composite particles on the carbon paper by using the Joule heat, the silicon-based composite material is obtained. The method disclosed by the invention is simple to operate, good in process controllability, high in yield and low in cost, and shows excellent comprehensive performance in the lithium ion battery.

The invention discloses an ytterbium-silicon alloy and a preparation method and application thereof, and relates to the technical field of alloys. According to the preparation method of the ytterbium-silicon alloy, the ytterbium-silicon alloy with the system composition basically consistent with the eutectic point is successfully prepared by controlling parameters such as the heating rate and the temperature in the eutectic melting process of ytterbium and silicon, the melting point of silicon can be reduced to 1253 DEG C or below, and follow-up machining and using of the ytterbium-silicon alloy are greatly facilitated. When the ytterbium-silicon alloy prepared by the method is used as a raw material for introducing silicon to prepare a carbon fiber reinforced silicon carbide composite material, the composite material with the bending strength reaching up to 249.85 MPa or above can be obtained, and the ytterbium-silicon alloy has a wide application prospect in the fields of aviation and the like.

Provided is a process for preparing composite particles for use as an electroactive material for a metal-ion battery, the process comprising the steps of: (a) providing porous particle frameworks comprising micropores and / or mesopores and optionally a polyvalent metal; (b) optionally impregnating the porous particle frameworks with a polyvalent metal; (c) depositing elemental silicon and / or elemental germanium in the pores of the porous particle frameworks; wherein either the porous particle frameworks in step (a) comprise the polyvalent metal, step (b) is performed, or both; thereby providing impregnated porous particle frameworks comprising the polyvalent metal and the silicon and / or germanium; and (d) contacting the impregnated porous particle frameworks with a monovalent metal while applying an electric potential effective to cause the formation of an intermetallic phase which comprises the polyvalent metal, silicon and / or germanium, and the monovalent metal; thereby providing the composite particles.

The present invention aims to provide an electromagnetic wave-absorbing composition comprising a thermoplastic resin or a thermoplastic elastomer, exhibiting electromagnetic wave absorption performance, and suppressing an increase in fluidity when heated. The composition of the present invention comprises a component (A) that is at least one selected from a thermoplastic resin and a thermoplastic elastomer and a component (B) that is a Fe-Cr-Si-based soft-magnetic metal powder at a mass ratio (component (A) / component (B)) in a range of 5 / 95 to 80 / 20, further comprises a component (C) that is at least one selected from a phosphite-based compound and a phosphate-based compound in an amount of 0.02 to 1.4 parts by mass relative to 100 parts by mass in total of the component (A) and the component (B), and has an electromagnetic wave absorption energy P at 79 GHz of 5 kW / m3 or more.

The invention concerns the field of noble metal processing and relates to a platinoid-silicide- and silicon-carbide-containing mixture, which is recycled from platinoide- and SiC-containing materials, enriched, concentrated and / or cleaned, and to a method for producing same. The problem addressed by the present invention consists in specifying a platinoid-silicide- and silicon-carbide-containing mixture in which the platinoid-silicides are present at high yield and / or high purity and which is produced from platinoid- and SiC-containing materials by way of a simple and cost-effective method. The problem is solved by a platinoid-silicide- and silicon-carbide-containing mixture in which platinoids are present at a concentration of at least 1 mass % and in which, in addition to silicon carbide particles and silicon carbide particle agglomorates, the platinoids are present as platinoid silicide particles and / or as agglomerates of platinoid silicide particles, and or platinoid silicide particles bond the silicon carbide particles into an agglomerate and / or are arranged on the surface of the silicon carbide particles, wherein the silicon carbide of the silicon carbide particles is present as technically pure silicon carbide.

The present invention discloses a M Si2 type high entropy silicide powder and its preparation method and application. According to mass fraction, 30-50% high entropy alloy powder, 10-30% silicon powder, 2-10% catalyst and 30-50% inert filler are mixed by a mixer to obtain a mixed powder; the high entropy alloy powder includes at least three metal elements of Ta, W, Nb, Mo, V, Zr, Hf, Ti and Cr, wherein the particle size of the high entropy alloy powder is 20-200 μm; the particle size of the silicon powder and the inert filler is not more than 10 μm; the mixed powder is sintered at a medium-high temperature of 1050-1200 °C for 12-20h under an inert gas atmosphere to make the high entropy alloy powder react in situ to generate high entropy silicide powder; the high entropy silicide powder is vibrated and sieved to separate M Si2 type high entropy silicide powder. The preparation method of the present invention has high adjustability for component design, and the obtained high entropy silicide powder has high purity, uniform structure, and uniform element distribution. The coating prepared by using it has good high temperature oxidation resistance and broad application prospects.

The present invention relates to a negative electrode active material comprising metal particles that include a core and a shell surrounding the core and whose surfaces are entirely or partially coated with an alkali metal-containing substance, a method for producing the same, and a lithium secondary battery including the same.

The present invention can provide a method for producing a sulfide solid electrolyte, the method characterized by including: a solution preparation step for preparing a uniform solution that includes at least elemental lithium (Li), elemental tin (Sn), elemental phosphorus (P), and elemental sulfur (S) in an organic solvent; a drying step for removing the organic solvent from the uniform solution to obtain a precursor; and a heat treatment step for heat-treating the precursor to obtain a sulfide solid electrolyte.

The invention provides a lithium manganese iron phosphate positive electrode material, a preparation method thereof and a lithium ion battery, and relates to the field of secondary batteries. The lithium manganese iron phosphate positive electrode material comprises an inner core and a coating layer located on the outer surface of the inner core, a material for forming the inner core comprises lithium manganese iron phosphate, a material for forming the coating layer comprises a high-conductivity compound, the high-conductivity compound comprises manganese and a non-metallic element, and the non-metallic element comprises any one of B, S, P, Si, As and Se. The coating layer containing the high-conductivity compound is formed on the outer surface of the lithium manganese iron phosphate, so that the resistivity of the material can be reduced, the dissolution of the manganese element in the lithium manganese iron phosphate can be inhibited, and the cycle performance of the material can be improved.

According to an embodiment, there is provided a regenerator material including an intermetallic compound represented by a compositional formula EraFebSi100-a-b (where 15≤a≤25, and 35≤b≤45), the intermetallic compound including a crystalline phase with a ThCr2Si2-type crystal structure as a main phase, and the crystal grain size of the main phase being 0.001 mm or more and 1 mm or less.

The present invention relates to a silicon-based material consisting of at least silicon particles, the silicon particles being nanostructured and micron-sized, the nanoporous structure of the particles comprising oriented channels that completely penetrate the silicon particles and connect two opposite surfaces of the particles, and also includes a method for producing the silicon-based material consisting of at least silicon particles as described above, the method comprising the steps of: producing a solidified eutectic metal silicide silicon structure consisting of a metal silicide phase and a silicon phase by a controlled directional solidification process of a eutectic metal silicon melt; and forming a nanoporous structured silicon by dissolving the metal silicide phase of the solidified eutectic metal silicide silicon structure by a chemical etching process.

The invention relates to an electrode active material, an electrode mixture, an electrode layer, a battery, and methods for manufacturing the same. The main purpose of the present invention is to provide an electrode active material having little change in volume due to charge and discharge. The present disclosure solves the above-mentioned problem by providing an electrode active material having a silicon inclusion compound type II crystal phase, the electrode active material having voids inside primary particles, and the void amount P1 of voids having a pore diameter of 5 nm or less being 0.015 cc / g to 0.05 cc / g (inclusive).

The invention provides a manufacturing method of a negative electrode material, the negative electrode material, a negative electrode and a lithium ion battery, and the method comprises the following steps: adding a metal salt compound into a first solvent to form a first mixture; adding a silicon-based material into the first mixture to form a second mixture; performing first heat treatment on the second mixture to obtain an intermediate product; adding a carbon-based material and the intermediate product into a second solvent to form a third mixture; and performing a second heat treatment on the third mixture to obtain the negative electrode material, in which the negative electrode material comprises a metal silicide and a carbon coating layer coating the metal silicide, and both the metal silicide and the carbon coating layer are formed during the second heat treatment.

To further prevent deterioration of charge-discharge characteristics of a Si-containing material.SOLUTION: The method of producing a porous silicon material according to the present invention, comprises a precursor production step of melting, rapidly cooling and coagulating a raw material including Al, Si and V to obtain a precursor of a silicon alloy, and a step of making the alloy porous by removing an Al component included in the silicon alloy, to obtain a porous silicon material.SELECTED DRAWING: None

The invention relates to a preparation method of a polyacid modified CuMoSelectrode material, and belongs to the technical field of new energy materials and photoelectric conversion. According to the preparation method, an in-situ synthesis method is adopted, and SiW11Co is doped in a CuMoS material through a one-step solvothermal preparation technology; comprising the following steps: S1, dissolving sodium molybdate and thioacetamide in ethylene glycol, then adding SiW11Co into the solution for dissolving, finally adding Cu2O, and carrying out ultrasonic treatment on the mixed solution at room temperature for 10-15 minutes to obtain a uniform dark brown suspension; s2, continuously stirring for 5 minutes, transferring the precursor suspension into a high-pressure reaction kettle, and carrying out a solvothermal process for 22-24 hours; s3, the reaction kettle is cooled to the room temperature, a final product is centrifugally washed three times with deionized water and absolute ethyl alcohol respectively, then vacuum drying is conducted, and the SiW11Co / Cu2MoS4 composite material is obtained. By introducing a proper amount of SiW11Co, a rough structure is formed on the surface of CuMoS, the number of active sites is increased, the specific surface area is increased, and the catalytic performance and the stability are far better than those of a traditional CuS counter electrode and an unmodified CuMoS counter electrode.

A nitride semiconductor material having low lattice thermal conductivity and a heat flow switching element including the same are provided. The nitride semiconductor material according to the present invention is a metal nitride represented by M-Si-N-Te (where M represents at least one kind of transition metal element, and Te represents an arbitrary element), and has a thermal effusivity of less than 2000 Ws0.5 / m2K. In particular, the M is at least one of Cr, Mn, Ni, Mo, and W. In addition, a heat flow switching element according to the present invention includes an N-type semiconductor layer 3, an insulator layer 4 formed on the N-type semiconductor layer, and a P-type semiconductor layer 5 formed on the insulator layer, wherein at least one of the N-type semiconductor layer and the P-type semiconductor layer is formed from the nitride semiconductor material described above.

The present invention improves ion conductivity while improving water resistance. Provided is a solid electrolyte having a composition formula represented by LixMXy, wherein M is one or more elements selected from group 14 elements, X includes S, and the compositional ratio of Li, M, and X is x:1:y. The crystal structure of the solid electrolyte is hexagonal, and the volume of a hexagonal unit cell is greater than 0.0870 nm3 but less than 0.0880 nm3.

Described herein are electrochemically active-material structures comprising silicon and one or more inert elements, chemically and / or atomically dispersed in these electrochemically active-material structures. Also described are negative battery electrodes and lithium-ion electrochemical cells comprising such electrochemically active-material structures as well as methods of fabricating such structures, electrodes, and lithium-ion electrochemical cells. Some examples of atomically-dispersed inert elements include, but are not limited to, hydrogen (H), carbon (C), nitrogen (N), and chlorine (Cl). Unlike silicon, inert elements do not interact with lithium at an operating voltage of the negative battery electrode and therefore do not contribute to the overall cell capacity. At the same time, these inert elements help to mitigate silicon swelling by operating as a mechanical buffer, support structure, and / or additional conductive pathways. Such electrochemically active-material structures can be formed by reacting (chemically or electrochemically) one or more precursors that include silicon and corresponding inert elements.

The invention relates to the technical field of impurity removal and recycling of silicon-containing waste residues, and discloses an impurity removal and utilization method of silicon-containing waste residues in a polycrystalline silicon production process, which comprises the following steps: immersing the silicon-containing waste residues in the polycrystalline silicon production process into a leaching solution containing hydrofluoric acid and copper nitrate, adding hydrogen peroxide, and carrying out a metal-assisted chemical etching reaction, obtaining silicon powder attached with copper; and the silicon powder attached with copper is annealed and then put into a cold hydrogenation reaction. According to the method, the purification of the silicon-containing waste residues and the loading of copper can be realized in one step by utilizing a metal-assisted chemical etching method, and a cuprous chloride catalyst does not need to be additionally added in a subsequent cold hydrogenation process. The silicon powder in the silicon-containing waste residue is recycled, the production cost is reduced, the waste of resources is avoided, and the method conforms to the criterion of harmless treatment.

The invention provides a preparation method of a silicon-copper composite catalyst, which comprises the following steps: pretreatment: uniformly mixing a copper-containing raw material and excessive silicon powder, putting the mixture into a reaction container, and feeding the reaction container into a heating furnace; the heating furnace is controlled to be heated to 1400-1500 DEG C, the silicon powder and the copper-containing raw materials are melted and react, and a mixture of Cu3Si and the remaining silicon powder is obtained; after the reaction step is completed, a mixture of Cu3Si and silicon powder is taken out of the heating furnace, naturally cooled to the room temperature and solidified into a blocky structure, and the blocky structure is crushed into powder; wherein the copper-containing raw material is elemental copper, copper-containing metal salt or copper oxide. According to the preparation method of the silicon-copper composite catalyst provided by the invention, the silicon powder and the copper-containing raw material are subjected to direct melting reaction, and the preparation is simple. And the silicon powder is controlled to be excessive based on cost consideration, so that the raw material silicon powder for producing the catalyst can also be used as a raw material in a cold hydrogenation process, and the excessive raw material silicon powder and the product Cu3Si do not need to be separated.

To prevent Mg2Si and SiO2 from being present in a produced porous silicon.SOLUTION: A method for producing porous silicon includes: a reduction step of obtaining an intermediate product containing Si and MgO by bringing Mg vapor into contact with a raw material containing SiO2 under reduced pressure and under conditions of Mg vapor pressure lower than the equilibrium pressure in the following reaction formula (1); and a cleaning step of removing MgO from the intermediate product.SELECTED DRAWING: Figure 2

The method comprises the steps that a raw material 1 and a raw material 2 are simultaneously conveyed to a reaction kettle through two charging machines and pipelines of the two charging machines and inert gas, the raw material 1 is pure silicon powder, the raw material 2 is pure silicon powder and pure nickel powder which account for half of the raw material 1 and are evenly mixed, the feeding speed of the raw material 1 is 1-3 Kg / h, the feeding speed of the raw material 2 is 1-3 Kg / h, and the feeding speed of the raw material 2 is 1-3 Kg / h; the feeding speed of the raw material 2 is 0.2-1Kg / h, and the feeding speed of the raw material 1 is 3-10 times of the feeding speed of the raw material 2 all the time; the raw material 1 enters a plasma arc core area under the conveying of inert gas, the raw material 1 is evaporated to form silicon steam, and the inert gas forms high-temperature carrier gas; conveying the raw material 2 into a tail area outside the plasma arc core area under the conveying of inert gas, and heating and melting to form silicon-nickel alloy liquid drops; and forming a silicon nanowire containing a silicon-nickel alloy in the silicon nanowire forming region. The method is simple in preparation process, safe, environmentally friendly, relatively low in equipment cost, high in controllability of technological parameters and capable of achieving large-scale production.