306results about How to "Small volume expansion" patented technology

A crucible with 22 inches or more in inner diameter, which has a small deformation of the body under exposure to abundant heat radiation during pulling a single crystal, and which has no practical problem, and a method of producing the same are disclosed. The method comprises the steps of: feeding first silicon dioxide powder along an inner surface of a rotating mold having a gas permeable wall to form a piled up layer of the first silicon dioxide powder; heating the piled up layer from the inside space of the mold to have the first silicon dioxide powder molten to provide the opaque outer layer as a substrate, while vacuum suction is effected through the wall; generating a high temperature gas atmosphere in an inside space of the substrate during or after the formation of the opaque outer layer; feeding second silicon dioxide powder into the high temperature gas atmosphere to have the second silicon dioxide powder molten at least partly; and directing the second silicon dioxide powder in an at least partly molten form toward an inner surface of the substrate to have the second silicon dioxide powder deposited on the inner surface of the substrate to thereby form the transparent inner layer thereon, the transparent inner layer being of a predetermined thickness and substantially free of bubbles.

This invention provides a high heat transfer performance liquid nano-metal. It relates to cooling fluid working medium, and especially it can be used under high rush density condition which need high intensity cooling fluid working medium for heat exchanging and cooling, such as computer array and reactor. The solvent of this invention is liquid metal, and the soluble of this invention is nanometer particle. This invention solve the problem of high price of present metal liquid cooling working medium and the limited performance of common metal liquid, leaking out easily taken place using common liquid and easy forming sediment of present nanometer cooling agent.

The invention relates to a hollow silicon-based composite material, a preparation method and a lithium ion battery. The hollow silicon-based composite material disclosed by the invention comprises hollow cavities, a carbon-silicon composite layer and a cladding carbon layer in sequence from inside to outside, wherein the carbon-silicon composite layer comprises a secondary particle silicon layer and a deposited carbon layer. The preparation method comprises the following steps: firstly bonding silicon oxide and/or silicon on the surface of graphite uniformly, then removing the graphite through oxidizing heat treatment to obtain a hollow structure, then obtaining nanometer silicon through reduction by using a reducing agent, obtaining hollow particles consisting of the hollow cavities and the secondary particle silicon layer, then carrying out in-situ cladding on the surface of the secondary particle silicon layer, and then finally carrying out cladding of the cladding carbon layer to obtain the hollow silicon-based composite material. The battery prepared by using the composite material as an anode material has high cycle performance and rate capability, the first-time reversible capacity is more than 1453.2 mAh/g, the first-time coulomb efficiency is more than 87.8%, and the hundred-time cycle capacity retention ratio is more than 95.2%.

The invention discloses a liquid metal fluid containing phase-change microcapsules, which adopts phase-change microcapsules (1) as a solute and liquid metal (2) as a solvent, wherein the phase-change microcapsules (1), which are prepared by using an in-situ polymerization method or other methods to embed a phase-change material (3) into an outer casing (4), are spherical and has the diameter of 1nm-1mm; and the liquid metal (2) can be mercury, gallium, gallium-indium alloy or gallium-indium-tin alloy. The invention has the advantages that the liquid metal fluid containing the phase-change microcapsules has a large apparent ratio in the phase-change temperature area of a phase-change material, the phase-change microcapsules (1) are difficult to be deposited or aggregated, the liquid metal fluid has favorable performances in the aspects of calorifics, electrics, magnetics, and the like, and the thermal properties of traditional liquid metals can be enhanced greatly. The liquid metal fluid is a cooling medium suitable for various heat radiating occasions with high heat flux density, and can be widely applied to the fields of computer chips, satellites, rocket propulsion booster and lasers.

The invention belongs to the industrial field of quick-frozen foods, and in particular relates to a quick-frozen dumpling and a preparation method thereof. The novel quick-frozen dumpling comprises a dumpling wrapper and dumpling stuffing, wherein the dumpling wrapper is made from flour, coarse cereals flour, vegetable protein powder, anti-freezing protein, modified starch, an enzyme preparation, vegetable polysaccharide and water; and the dumpling stuffing is made from meat, vegetables, a seasoner, modified starch, vegetable proteins and water. The quick-frozen dumpling is even and reasonable in nutrition collocation, abundant in nutrition, and delicious in taste. The novel quick-frozen dumpling is fresh in taste and good in color and luster under the freezing status, can notbe frozen to be cracked, and can not degrade the dumpling wrapper, the electric energy can be saved by more than 20% during producing, and the multiple effects for improving the high quality, saving the energy, and reducing the consumption are realized.

The invention discloses a preparation method of a molybdenum carbide/nitrogen-sulfur codoped spongy graphene cathode composite for a sodium-ion battery. According to the molybdenum carbide/nitrogen-sulfur codoped spongy graphene cathode composite prepared through the preparation method, molybdenum carbide particles are uniformly distributed in carbide/nitrogen-sulfur codoped spongy graphene which has a great number of surface folds, has a great number of active sites and is of a three-dimensional structure. The preparation method comprises the steps of dissolving a molybdenum source and a carbon source into a graphene oxide solution, adding a nitrogen source and a sulfur source, adjusting ph value, then conducting a hydrothermal reaction on an obtained mixed solution, conducting freeze-drying on a product, then putting the product in a quartz crucible for high temperature heat treatment, and conducting natural cooling after a reaction is ended, so that the composite is obtained. In the hydrothermal reaction process, graphene doping and reduction, formation of a precursor and composition of the precursor and doped graphene are conducted synchronously. The composite can be obtained by combining the hydrothermal method with the subsequent heat treatment process, and the preparation method is simple in process and low in cost and has good research prospect.

The invention discloses a silica brick for a glass furnace, and belongs to the technical field of refractory materials. The silica brick for a glass furnace comprises: by weight, 30 to 45% of silica having particle sizes of 3 to 1.0mm, 5 to 25% of silica having particle sizes of 1.0 to 0.5mm, 30 to 50% of silica having particle sizes less than 0.5mm, an additive and a composite additive, wherein the weight of the additive is 5 to 15% of the total weight of the silica and the weight of the composite additive is 2 to 10% of the total weight of the silica. SiO2 content of the silica is great than or equal to 99%. Al2O3 content of the silica is less than or equal to 0.25%. Fe2O3 content of the silica is less than or equal to 0.45%. The additive is a waste silica material having SiO2 content great than or equal to 96%. The composite additive is a mixture of lime milk, mill scales and calcium lignosulphonate. The silica brick for a glass furnace has high SiO2 content, a high yield, low impurity content, low apparent porosity, good high-temperature performances and a long service life. A preparation technology of the silica brick for a glass furnace is simple and is suitable for large-scale production.

The invention discloses a porous silicon and carbon mixed anode plate and a lithium ion secondary battery comprising the same. The porous silicon and carbon mixed anode plate comprises a porous anode current collector, and two coating layers coating the porous anode current collector, wherein a first layer which is close to the porous anode current collector is made of a mixture of a bonding agent and a conductive agent, a second layer is made of a mixture of a silicon and carbon mixture, the bonding agent and the conductive agent, and the second layer coats the first layer; the lithium ion secondary battery comprises a cathode plate, the porous silicon and carbon mixed anode plate, and an isolating membrane and electrolyte which are arranged between the cathode plate and the porous silicon and carbon mixed anode plate. The porous silicon and carbon mixed anode plate provided by the invention overcomes the defect that the silicon and carbon mixed anode lithium ion secondary battery prepared by adopting a traditional technology is large in volume in the cyclic process, and is capable of increasing the circulation capacity retention ratio of the silicon and carbon mixed anode lithium ion secondary battery, reducing the thickness swelling rate of the lithium ion battery in the cyclic process and increasing the energy density of the lithium ion secondary battery.

The invention discloses a preparation method for a graphite anode material of a lithium ion battery. Fine graphite powder with a small particle size and an organic carbon source are taken as raw materials; through adoption of processes such as mixing, high temperature processing, graphitizing and sieving and through mixing of the fine powder and the organic carbon source in a heating environment, coating, kneading and secondary granulating effects can be realized; and under the adhering effect of the organic carbon source, the fine powder with the small particle size forms secondary particles. The anisotropy problem of the materials is solved, and the tap density of the materials is improved. According to the method, the turnover and device residual loss of the materials are reduced, the yield is high, the processes are simple, the energy consumption is low, the environment is protected, the surface coating effects of the materials are even, and the consistency is high. The prepared anode material is characterized in anisotropy, low iron impurity content, low initial irreversible capacity, low volume expansion, high liquid absorbency, high cycle performance, high cost performance and high comprehensive performance.

A high-power LED multi-hole phase-changing heat sink structure comprises a radiator inner cavity. A plurality of radiator fins are arranged on the top face of the radiator inner cavity. A metal multi-hole structure is arranged in the radiator inner cavity in a sintering mode. Holes of the metal multi-hole structure are filled with phase-changing materials. An LED electronic chip is arranged on the bottom face of the radiator inner cavity. The melting point of the phase-changing materials is lower than the normal working temperature of the LED electronic chip. The response speed of phase-changing latent heat storing can be increased, the weight and the cost of an LED radiating structure are lowered, a part of heat emitted by the chip during LED working is dissipated in a natural-convection mode, a large part is stored by latent heat absorbed during a phase-changing material melting process, meanwhile, the temperature of the LED chip is controlled through the melting point of the phase-changing materials, and radiating performance is improved. The high-power LED multi-hole phase-changing heat sink structure has the advantages of being simple in structure, light in weight, small in size, good in adjusting performance, good in radiating effect, long in service life, free from external energy loss and environment pollution and the like.

The invention discloses a lithium-rich manganese material, a positive electrode material for a lithium-ion battery, a positive plate for the lithium-ion battery, the lithium-ion battery and a preparation method of the lithium-ion battery and relates to the technical field of lithium-ion batteries. The molecular formula of the lithium-rich manganese material is aLi2MnO3.(1-a)LiNi0.5Mn1.5O4.(1-a)LiNi0.5Mn0.5O2, wherein a is smaller than or equal to 0.3 and greater than or equal to 0.01. The positive electrode material comprises the lithium-rich manganese material; the positive plate is coated with the positive electrode material; an active material of the positive electrode material for the lithium-ion battery is the lithium-rich manganese material; and the active material of a negative electrode material is a SiO/C composite material. According to the lithium-rich manganese material, the defects that an existing positive electrode material is in low specific capacity and low in initialefficiency and an existing negative electrode material is low in coulombic efficiency and poor in cycle performance are relieved. Through the cooperation of the positive electrode material and the negative electrode material, the obtained lithium-ion battery has high specific energy and high security, and the energy density of the battery is greater than 320Wh/kg.

Disclosed is a preparation method for an artificial graphite negative electrode material for a lithium ion battery. Artificial graphite coke powder with small grain diameter and an organic carbon source are taken as the raw materials; the raw materials are subjected to procedures of mixing, high-temperature treatment, graphitization treatment, sieving and the like; the coke powder and the organic carbon source are mixed in a heating environment, and the effects of coating, mixing and holding, secondary pelleting and the like can be achieved; the small-particle coke powder can form secondary particles under the cohesive action of the organic carbon source; therefore, the problem of anisotropy of the material is solved, and the tap density of the material is improved; meanwhile, the artificial graphite negative electrode material is capable of lowering the material turnover and equipment residual loss, high in yield, simple in procedures, low in energy consumption, environment-friendly, uniform in the coating effect on the surface of the material, and high in consistency; and in addition, the prepared negative electrode material has the characteristics of isotropy, low iron impurity content, low initial irreversible capacity, small volume expansion, high absorbency, high circulation performance, high performance cost ratio, excellent comprehensive performance and the like.

The invention relates to flame-retardant and drippage-free ceramization silicon rubber and a preparation method thereof. The silicon rubber is prepared from components in parts by weight as follows: 100 parts of organic silicon rubber compounds, 1 part to 10 parts of a vulcanizing agent, 100 parts to 150 parts of ceramization powder and 0 to 100 parts of other filler or auxiliaries, wherein the ceramization powder is prepared from raw materials in parts by weight as follows: 1 part to 120 parts of glass powder, 1 part to 20 parts of muscovite, 1 part to 200 parts of magnesium hydroxide, 1 part to 200 parts of aluminum hydroxide, 0.1 parts to 50 parts of boron compounds and 0.1 parts to 20 parts of phosphono-containing polymer compounds. The ceramization silicon rubber prepared with the method has advantages of good flame retardance and self-extinguishment performance; a ceramic layer formed after firing has good compactness and insulativity, external force resistance and the like. The preparation process is simple, raw materials are cheap, and accordingly the silicon rubber is expected to be applied to fields such as wires and cables, the electronic and electrical technology, aerospace engineering and the like and has quite good economic benefits and popularization value.

The invention relates to a micro-emulsion-type wood and bamboo mould-proof agent, as well as a preparation method and application thereof. The micro-emulsion-type wood and bamboo mould-proof agent comprises the following components in parts by weight: 1 to 200 parts of isothiazolinone original medicaments, 1 to 1,000 parts of ester solvents, 1 to 500 parts of alcohol or ester cosolvents, 1 to 1,500 parts of polyoxyethylene non-ionic surfactants, 1 to 150 parts of succinate or polyoxyethylene ether salt non-ionic surfactants, 1 to 100 parts of long-chain carboxylic acid additives, and 1 to 1,000,000 parts of water. The micro-emulsion-type wood and bamboo mould-proof agent disclosed by the invention has the advantages that the chemical agents meet the requirements on environment friendliness and no toxicity; the preparation process is simple; the crystallization degree is low; the stability is high; the particle size is small; the permeability and the mould-proof performance are high; the volume expansibility of the processed bamboo and wood is reduced and the like; the micro-emulsion-type wood and bamboo mould-proof agent is stable, effective and environmentally-friendly, and is much better than that in the prior art.

The invention provides a preparation method of carbon tin nanometer composite powder of a negative electrode material of a lithium ion battery, and belongs to the field of preparation technologies and the application of nanometer materials. The technical solution scheme of the preparation method is that by utilizing automatic control direct current arc plasma equipment, block-shaped metallic tin or micron-size tin powder is pressed into a block to serve as an anode; a graphite rod is used as a cathode; a certain proportion of carbon-containing gas, active gas and inert gas are introduced a reaction chamber; and after a block-shaped target material is evaporated, carbon-coated tin nanometer composite particles are obtained. The powder material is used as an active substance to manufacture a negative electrode of the lithium ion battery, and the first reversible specific capacity of the powder material can reach 620mAh/g. The preparation method has the advantages that the carbon-coated tin nanometer particles synthesized in situ are provided with structures of multi-wall carbon nanometer tubes partially filled with the metallic tin, and the material used as the negative electrode material of the lithium ion battery has high intercalation/deintercalation lithium capacity density and high cycle stability; and besides, the costs of raw materials are low, the process is simple and large scale preparation can be conducted, so that the preparation method satisfies the requirements of industrial production.

The invention discloses a preparation method of a silicon monoxide composite negative electrode material, which comprises the following steps: by using elemental silicon and silicon dioxide as initialraw materials, carrying out a neutralization reaction to generate silicon monoxide; vaporizing silicon monoxide, introducing the vaporized silicon monoxide into a chemical vapor deposition furnace filled with a carbon material, and carrying out chemical vapor deposition to obtain a primary product; and finally, carrying out carbon coating to obtain the silicon monoxide composite negative electrode material. The prepared composite negative electrode material has a sandwich type sandwich structure, a carbon material is taken as a core, the outer surface of the carbon material is uniformly coated with silicon monoxide, and the outermost layer is coated with a uniform carbon layer. The lithium ion battery assembled by the composite negative electrode material has relatively high capacity andrelatively good cycling stability, and particularly has ultrahigh initial coulombic efficiency, and the highest initial coulombic efficiency can reach 90%.

The invention discloses an anode active material of lithium ion batteries. The anode active material includes silicone alloy particles, wherein the interior of the silicone alloy particles is in a hollow honeycomb-like structure and the outer layer of the silicone alloy particles is coated with an amorphous carbon layer. The anode active material is in the structure that the interior is in the hollow honeycomb-like structure while the outer layer is coated with the amorphous carbon layer, so that not only is volume expansion during charging and discharging process alleviated through the pores in the honeycomb-like structure, but also the relative expansion of the particles can be reduced through the hollow honeycomb-like structure, so that damage on SEI films on the surface of the particle is reduced, and the anode active material can improve electrochemical performances of the lithium ion batteries and prolongs the service life of the lithium ion batteries. In addition, the invention also discloses a preparation method of the anode active material of the lithium ion batteries, and a lithium ion battery anode piece and a lithium ion battery manufactured with the anode active material.

Disclosed is a process for producing a silicon-based composite material for a lithium ion battery cathode. The process comprises that silicon powder serves as a main material, graphite powder or flocculent carbon black serves as an auxiliary material, the main material and the auxiliary material are mixed and placed in a ball-grinding steel tank, argon serves as a shielding gas, the ball-grinding steel tank inflated with the shielding gas is placed in a planetary ball mill, and powder with granularity of less than 20 mum, which is the silicon-based composite material for the lithium ion battery cathode, is obtained after the mixture is subjected to ball milling at 500 revolutions/minute for 80 hours. The process has the advantages that the silicon material having the good lithium-storing capacity is mixed with the carbon material having the good electrical conductivity, atomic-grade mixing of the silicon material and the carbon material is achieved in a mechanical alloying mode, the electrical conductively of the silicon matrix is fully improved, and the inert carbon material can reduce volume expansion caused by the processes of lithium intercalation and lithium deintercalation of the silicon material in the processes of charging and discharging of the inert carbon material, so that the cycle performance of the silicon material is improved, the electrical conductivity and the cycle performance of the carbon-doped material are better than those of the pure silicon material.

The invention discloses a calcined quartz powder casting coating and a production method thereof. The calcined quartz powder casting coating comprises the following components: 80-100 parts of quartz powder, 0-50 parts of corundum powder, 0-100 parts of mullite powder, 0-30 parts of bauxite powder, 0-100 parts of zircon powder, 0-10 parts of flake graphite, 0-20 parts of earthy graphite, 0-5 parts of red iron oxide, 6-8 parts of a suspension, 5-8 parts of resin and an appropriate amount of a solvent. The production method comprises the following steps: adding the suspension, the resin and the appropriate amount of solvent in a blender to be stirred for 10-30 minutes, then adding quartz powder, alumina powder, mullite powder, bauxite powder, zircon powder, flake graphite, earthy graphite, and red iron oxide to be stirred for 30-60 minutes, adding the appropriate amount of solvent to be adjusted to an appropriate proportion to obtain the casting coating. According to the calcined quartz powder casting coating and the production method thereof provided by the invention, the calcined quartz powder is used as a refractory material to produce the coating, and the resource of quartz powder is rich, so that the problem of lack of resources is solved; the cost is greatly reduced, the product quality is improved, the market competitiveness is strong and the popularization and application value is high.

The invention discloses a high-capacity composite anode material, a preparation method, and a lithium ion battery containing the high-capacity composite anode material, which belong to the technical field of new energy materials. The method comprises the following steps of (1) mixing and ball milling an organic carbon source, nanometer silicon and silicon oxide, mechanical fusing, and obtaining acarbonized precursor; (2) carrying out heat treatment on the carbonized precursor to obtain the composite anode material. According to the method provided by the invention, two high-capacity anodes are synthesized, and the high-performance composite anode material is prepared through a specific process design; the composite anode material is not only high in capacity and energy density, but also greatly improved in contact and electrical conductivity, small in interface resistance, small in volume expansion, and beneficial to reducing of side reaction, ensures the cell volume expansion to be within a reasonable range, and ensures the safety of the cell.

The invention discloses a battery anode material of embedding Sn-based alloy in porous carbon and a preparation method of the battery anode material. The composite material is formed by uniformly embedding nano Sn-based alloy, coated by three-dimensional network porous carbon, into a three-dimensional network carbon structure. The preparation method includes steps of: dissolving NaCl, as a template, with a carbon source, a tin source, and other metal salts, uniformly mixing the components, and freeze-drying the mixture to maintain the cubic structure of NaCl; grinding the mixture, performing thermal treatment in a tubular furnace at certain temperature in an inert gas or reductive atmosphere, and washing the product to remove the NaCl template; drying the product to obtain the composite material. The material, as an anode in lithium ion or sodium ion batteries, is high in capacity, good in cycle performance and excellent in rate capability; the preparation method is simple, is environment-friendly and performance-controllable, and has universality and can be scaled-up.

An anode active material for a lithium secondary battery and a lithium secondary battery having the same are disclosed. The anode active material for a lithium secondary battery includes a silicon alloy consisting of silicon and at least two kinds of metals other than silicon, each having the heat of mixing with the silicon of −23 kJ/mol or less. The anode active material for a lithium secondary battery has a high capacity, and thus, is useful in fabricating a high-capacity lithium secondary battery. Also, the anode active material for a lithium secondary battery has a small crystal size of a silicon phase and consequently a small change in volume during charging/discharging, and thus, ensures excellent cycle life characteristics in applications to batteries.