24results about How to "High particle strength" patented technology

The invention provides a positive active material and a preparation method thereof, a positive pole piece, a battery and electric equipment, the change rate d of the characteristic peak interplanar spacing of the positive active material (104) is greater than or equal to 0.05% and less than or equal to 0.5%, d = (d before-d after) / d before * 100%, d before is the interplanar spacing of the characteristic peak of the positive active material (104) measured by an X-ray diffractometer before circulation, and d after is greater than or equal to 0.05% and less than or equal to 100%. And d, measuring the interplanar spacing of the characteristic peak of the positive electrode active material (104) by an X-ray diffractometer at 45 DEG C after circulation for 80 weeks. Therefore, the interplanar spacing change rate of the positive electrode active material before and after circulation is small, which shows that the crystal structure stability of the positive electrode active material is good, the positive electrode active material is not easy to pulverize in the long-term circulation process of the battery, and the cycle performance of the battery can be improved.

The invention relates to the technical field of lithium ion batteries, and discloses a positive electrode material precursor and a preparation method thereof, a lithium ion battery positive electrode material, a lithium ion battery and electric equipment. The positive electrode material precursor comprises secondary particles composed of primary particles, each secondary particle comprises a core layer and a shell layer, in the cross section of each secondary particle, the average length-width ratio of the primary particles in the shell layer is (1.5-8): 1, and in the surface of each secondary particle, the average length-width ratio of the primary particles is (1-3): 1. The positive electrode material precursor provided by the invention contains primary particles with a proper length-width ratio, so that the Li < + > diffusion resistance is reduced, and the particle strength is improved. When the positive electrode material precursor provided by the invention is applied to the lithium ion battery, the obtained lithium ion battery has high capacity and excellent cycle performance at the same time.

The invention discloses a preparation method of pitch-based porous carbon with an adjustable pore volume ratio, a product of the pitch-based porous carbon and application of the pitch-based porous carbon as a substrate to preparation of a silicon-carbon negative electrode material, the preparation of the porous carbon comprises the following steps: S1, dissolving cellulose in an alkali / urea / aqueous solution, fully hydrolyzing to obtain a uniform solution, adding pitch, and uniformly stirring; after fully mixing, heating and drying to obtain a cellulose and asphalt composite material; s2, heating the cellulose and asphalt composite material to carry out pre-oxidation crosslinking, and then carrying out pre-carbonization treatment in a protective atmosphere to obtain a carbonized material; and S3, activating the carbonized material to obtain the pitch-based porous carbon with an adjustable pore volume ratio. The asphalt-based porous carbon prepared by the method disclosed by the invention has extremely high particle strength, the micropore rate and the micropore-mesopore ratio are adjustable, and the silicon-carbon negative electrode material prepared by taking the asphalt-based porous carbon as the substrate has excellent cycling stability, high reversible specific capacity and first coulombic efficiency.

The invention belongs to the technical field of film materials, and particularly relates to a high-barrier polyethylene film and a preparation method thereof. The material consists of a polyethylene-based film layer, a coating barrier layer and an aluminum-plated layer, wherein the polyethylene-based film layer is prepared by combining nine layers of co-extruded films with a micro-stretching process; the coating blocking layer is composed of a water-based acrylic acid coating layer and a water-based polyvinyl alcohol coating layer which are connected in sequence, the polyvinyl base film layer is coated with the water-based acrylic acid coating layer, and the aluminum plating layer is plated on the water-based polyvinyl alcohol coating layer in a vacuum mode. The high-barrier polyethylene film material is good in barrier effect and can be recycled.

The present invention relates to a positive electrode active material for a secondary battery which is a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), wherein the lithium composite transition metal oxide includes the nickel (Ni) in an amount of 65 mol% or more and the manganese (Mn) in an amount of 5 mol% or more based on a total amount of transition metals, and at least one particle growth-promoting element selected from the group consisting of strontium (Sr), zirconium (Zr), magnesium (Mg), yttrium (Y), and aluminum (Al), wherein the electrode positive active material is composed of a single particle.

The invention discloses a positive electrode active material, an electrochemical device and electric equipment, and belongs to the technical field of electrochemical energy storage devices. A button cell is assembled by a positive plate containing the positive electrode active material and a negative plate of lithium metal, the button cell is charged and discharged for 100 cycles at the current multiplying power of 0.5 C and the upper and lower limit voltage of 2.8-4.4 V, the peak position change value of the 003 diffraction peak of the positive electrode active material in the cycle charging state of 100 cycles is small, and the peak position change value of the 003 diffraction peak of the positive electrode active material is small. The positive electrode active material has excellent particle strength and crystal structure stability, lithium ion transmission is facilitated, and the cycle performance of the positive electrode active material is improved.

The present application relates to a positive electrode material and a preparation method thereof, and a battery. The positive electrode material is a nickel cobalt lithium composite oxide. The positive electrode material is measured by XRD to obtain a characteristic peak I(104) corresponding to the (104) crystal plane of the positive electrode material. The characteristic peak I(104) is separated to obtain two diffraction peaks. The separation degree α of the two diffraction peaks satisfies: 0.7≤α≤2.0. The technical solution provided by the present application can improve the particle strength of the positive electrode material and reduce the polarization phenomenon of the positive electrode material, so that the positive electrode material has both excellent cycle stability and rate performance.

This invention relates to the field of petroleum proppant production equipment technology, specifically disclosing a petroleum proppant preheating device with a spreading structure, including a spreading box and a preheating pipe. The spreading box is installed on one side of the preheating pipe and is connected to it. The spreading box has a material distribution structure and a material guiding structure inside. The material distribution structure includes an inclined outer cylinder and an inner cylinder. The inner cylinder is divided into multiple screening chambers by an annular partition. Each screening chamber is equipped with a grading screen plate with a different aperture at the bottom. The inner cylinder is equipped with a material agitator to move the material blanks. The material guiding structure is equipped with multiple sets of material guiding components. The material guiding components are equipped with stepped material guiding plates. A spreading wheel is set at the discharge end of the material guiding components. Two gas equalization plates with different apertures are fixed inside the preheating pipe. This invention separates material blanks of different particle sizes through the grading screen plates, sets different lengths of preheating paths through the material guiding components, and spreads the material blanks in layers through the spreading wheel. The gas equalization plates regulate the hot flue gas, so that all kinds of material blanks are heated evenly, reducing the bursting and pulverization of the material blanks during calcination and maintaining the roundness of the particles.

The invention relates to a modified insulating coating agent for iron-nickel magnetic powder, a preparation method of the modified insulating coating agent, insulating coated iron-nickel magnetic powder and an iron-nickel magnetic powder core. The modified insulating coating agent for the iron-nickel magnetic powder comprises a modifier, thermosetting resin and an organic solvent, the modifier comprises a whisker-shaped inorganic silicon mixture, a high-temperature-resistant mixture and a dispersing agent solution. The modified insulation coating agent is adopted for conducting insulation coating on the iron-nickel magnetic powder base body, the iron-nickel magnetic powder core prepared from the insulation-coated iron-nickel magnetic powder can bear higher temperature in the annealing process, and the problem that an insulation layer of the powder is damaged and decomposed due to the high annealing temperature is avoided; the higher annealing temperature is beneficial to further elimination of internal stress and optimization of a microstructure, so that the magnetic conductivity is improved and the loss is reduced; therefore, the process optimization can be carried out in a wider annealing temperature range, so that the improvement effect of high-temperature annealing on the performance of the iron-nickel magnetic powder core can be fully exerted.

The invention discloses a urea and urease / nitrification inhibitor synchronous slow release type special nitrogen fertilizer for winter wheat as well as a preparation method and application thereof, and belongs to the technical field of slow and controlled release fertilizer production. The urea, the urease / nitrification inhibitor, the plant fibers and the modified biochemical fulvic acid are pelletized and then coated, the raw materials are cheap, easy to obtain and environmentally friendly, the plant fibers and the modified biochemical fulvic acid can regulate slow release of the urease / nitrification inhibitor and have a synergistic effect on the urea, release and conversion of nitrogen are adjusted in a long-acting mode, and the nitrogen-rich fertilizer has a good application prospect. The release synchronism of nitrogen and the inhibitor is greatly improved. According to the fertilizer nutrient release characteristics and the winter wheat fertilizer requirement rule, synergistic coated fertilizers are added in different controlled release periods to be blended to prepare the winter wheat synchronous nutrition blended fertilizer, and topdressing is not needed when the fertilizer is applied once before sowing.

A method for strengthening methane in-situ combustion fracturing, liquid carbon dioxide is pressurized and heated to form supercritical carbon dioxide, which is then sent into the fracturing channel to form a complex fracture network around the fracturing channel; mixed fracturing fluid formed by mixing supercritical carbon dioxide and fly ash is injected into the well bottom; combustion-supporting agent is injected into the wellbore and mixed with the mixed fracturing fluid at the well bottom to enter the complex fracture network together, so that a multiphase mixed fluid is formed in the complex fracture network; the annulus valve is closed to promote mineralization reaction of supercritical carbon dioxide and fly ash under the temperature and pressure conditions of the reservoir, and to form high-strength minerals; the mineralization reaction is used to promote the desorption of methane in the reservoir and into the complex fracture network, so that methane-combustion-supporting agent mixed gas is formed in the complex fracture network; the combustion process is used to promote the dust cloud formed by the mixing of fly ash and gas in the complex fracture network, to strengthen the effect of methane in-situ combustion; and the fracturing reconstruction of all layers is completed. The fracturing effect of the method is ideal.

The invention discloses a ladle tank edge castable, which includes the following components by weight: 4-8 parts of CA-60 cement; 4-12 parts of CA-75 cement; 10-20 parts of clay waste; 25-30 parts of high-aluminum skateboard polishing recycled powder; 5-10 parts of waste ladle high-aluminum low-silicon steel pipe crushing material; 10-25 parts of waste brick slag tailings; 2-4 parts of kyanite; 5-6 parts of alumina micropowder; 8-9 parts of silicon micropowder; 0.2-0.3 parts of deflocculating agent; 0.5-2 parts of reinforcing agent. The invention also provides a method for using a ladle tank edge castable. The invention has the characteristics of high strength, low cost, good safety performance and environmental protection, good anti-stripping and anti-corrosion, stable quality, and not easy to pulverize, which improves the service life of the ladle tank, reduces the labor intensity of workers, reduces material consumption and industrial waste treatment costs, and effectively improves the recycling rate of recycled material tailings in steel mills and refractory material plants and the work efficiency of workers.

The present application belongs to the technical field of active coke, and particularly relates to a preparation method and device of active coke. The preparation method of active coke provided in the present application embodiment comprises the following steps: (1) performing granulation treatment on coal powder and red mud to obtain solid particles; and (2) performing coke making on the solid particles prepared in step (1) to obtain active coke. The method not only realizes resource utilization of solid waste, but also reduces the preparation cost of active coke. The prepared active coke not only has the original physical adsorption capacity of hydrogen sulfide, but also has the chemical adsorption capacity of metal oxides. The physical adsorption and chemical adsorption are combined, so that the active coke has higher adsorption capacity.

The invention discloses a preparation method of copper-doped bi-crosslinked asphalt-based porous carbon, a product of the porous carbon and application of the porous carbon as a substrate to preparation of a silicon-carbon negative electrode material, the preparation method of the porous carbon comprises the following steps: S1, dissolving cellulose in a copper ammonia solution to obtain a uniform solution, then adding asphalt, and uniformly stirring; after fully mixing, heating and drying to obtain a copper ammonia cellulose and asphalt composite material; s2, heating the copper ammonia cellulose and asphalt composite material to perform pre-oxidation crosslinking, and then performing pre-carbonization treatment in a protective atmosphere to obtain a carbonized material; and S3, carrying out activating treatment on the carbonized material to obtain the copper-doped bi-crosslinked asphalt-based porous carbon. The pitch-based porous carbon prepared by the method disclosed by the invention has high conductivity and excellent mechanical properties, and the silicon-carbon negative electrode material prepared by taking the pitch-based porous carbon as the substrate has excellent cycling stability and rate capability.

The application discloses a kind of based on aeolian genesis silt's anti-seepage material and preparation method thereof, belong to the field of water conservancy and hydropower engineering.It mainly includes the following weight parts of raw materials: aeolian genesis silt 48~54, gneiss aggregate 40~45 and modified bentonite 6~10.The anti-seepage material based on aeolian genesis silt of the embodiment of the application, gneiss aggregate, as the gravel component of anti-seepage material, is the support skeleton of anti-seepage material, and the particle strength is high, to increase the shear strength and deformation modulus, reduce shrinkage;Using modified bentonite, modified bentonite has stronger adsorption performance and bonding capacity, thereby improving the anti-seepage performance of anti-seepage material.The anti-seepage material based on aeolian genesis silt of the application has excellent anti-seepage effect and high mechanical strength.

This invention discloses a solid waste-based polymer material and its preparation method, belonging to the field of industrial solid waste resource utilization technology. It includes basic components, an activation liquid, a synergist, and a dopant. The basic components consist of the following raw materials in parts by weight: 40-70 parts fly ash, 8-12 parts desulfurized gypsum, 20-30 parts slag, and 10-35 parts red mud. The activation liquid is a sodium silicate solution, the synergist is urea, and the dopant is mercapto-modified hydrogen-containing polymethylsiloxane. This solid waste-based polymer material, using fly ash, desulfurized gypsum, slag, and red mud as basic components, achieves a high-proportion synergistic utilization of bulk industrial solid waste. The activation liquid in this solid waste-based polymer material is a sodium silicate solution, which can effectively activate the depolymerization and condensation reactions of silicon-aluminum precursors at room temperature, achieving room-temperature curing of the material. This eliminates the need for high-energy-consuming processes such as high-temperature sintering or high-pressure molding, significantly reducing energy consumption and carbon emissions during the preparation process.

The present invention refers to a positive electrode active material and a method for producing the same. The positive electrode active material includes a lithium-nickel-based oxide in the form of single particles, a pseudo-single particles, or mixture thereof, wherein on the surface of the lithium-nickel-based oxide, a number of nickel ions having an oxidation number of +3 or higher is greater than a number of nickel ions having an oxidation number less than +3.

The application discloses a method for preparing formed fuel by mixing semi-dried sludge and oil-tea camellia fruit hulls, and the method comprises the following steps: (1) washing and drying the oil-tea camellia fruit hulls, then crushing and sieving the oil-tea camellia fruit hulls to obtain oil-tea camellia fruit hull powder; drying high-moisture sludge to obtain semi-dried sludge; (2) baking the oil-tea camellia fruit hull powder under a mixed atmosphere of oxygen and nitrogen to obtain baked oil-tea camellia fruit hulls, or pyrolyzing the oil-tea camellia fruit hull powder under a nitrogen atmosphere to obtain oil-tea camellia fruit hull biochar; (3) mixing and stirring the semi-dried sludge and the baked oil-tea camellia fruit hulls or the oil-tea camellia fruit hull biochar, uniformly placing water, and then preparing formed fuel. The method is simple, easy to operate and low in cost, the prepared formed fuel particles can realize rapid reduction of urban sludge and recycling of energy, and the method has the advantages of low energy consumption, high particle strength, no pollution and the like when the formed particles are prepared.

The invention provides a positive active material and a preparation method thereof, a positive pole piece, a battery and electric equipment, the positive active material comprises secondary particles formed by primary particles, the positive active material comprises Li1 + aFebMc (PO4) d,-0.1 < = a < = 0.1, 0 < b < = 1, 0 < = c < = 0.5, 0 < d < = 1, and M comprises at least one of La, Ce, Cr, Mo, Ca, Hf, Ti, Fe, Zn, Y, Zr, W, Nb, Sm, Sb, Co, Ni, V, Mg, Na, B and Al; the porosity of the positive electrode active material is 6.5%-15%, and the average pore size of the positive electrode active material is 145 nm-290 nm. The battery containing the positive electrode active material provided by the invention has excellent capacity, rate capability and cycle performance.

The application belongs to the technical field of lithium extraction, and particularly relates to a titanium-based lithium extraction adsorbent and a preparation method and application thereof. The preparation method provided by the application comprises the following steps: a) mixing and grinding a lithium compound, a titanium compound, a zirconium compound, a niobium compound, an iron compound, a pore former and water, and drying to obtain a mixed powder; b) placing the mixed powder in a calcination device, first heating from ambient temperature to a first temperature at a first heating rate, then heating from the first temperature to a second temperature at a second heating rate, and calcining at the second temperature to obtain a precursor powder; c) granulating the precursor powder to obtain activated adsorbent particles; and d) placing the activated adsorbent particles in an acid solution for activation treatment to obtain the titanium-based lithium extraction adsorbent. The preparation method provided by the application can improve the adsorption capacity, ion selectivity and structural stability of the lithium extraction adsorbent, reduce the solution loss of the lithium extraction adsorbent, and prolong the service life of the lithium extraction adsorbent.

The present invention relates to a positive electrode active material for a secondary battery which includes a lithium composite transition metal oxide including Ni, Co, and Mn, wherein the lithium composite transition metal oxide is in the form of a secondary particle, and a glassy coating layer formed on surfaces of particles of the lithium composite transition metal oxide, wherein, in the lithium composite transition metal oxide, an amount of the Ni in a total amount of transition metals is 60 mol% or more, and an amount of the Mn is greater than an amount of the Co, and the glassy coating layer includes a glassy compound represented by Formula 1.          [Formula 1]     LiaM1bOc wherein in Formula 1, M1 is at least one selected from the group consisting of B, Al, Si, Ti, and P, and 1≤a≤4, 1≤b≤8, and 1≤c≤20.

The present invention relates to a positive electrode active material for a secondary battery which includes a lithium composite transition metal oxide including Ni, Co, and Mn, wherein the lithium composite transition metal oxide is in the form of a secondary particle, and a glassy coating layer formed on surfaces of particles of the lithium composite transition metal oxide, wherein, in the lithium composite transition metal oxide, an amount of the Ni in a total amount of transition metals is 60 mol% or more, and an amount of the Mn is greater than an amount of the Co, and the glassy coating layer includes a glassy compound represented by Formula 1.          [Formula 1]     LiaM1bOc wherein in Formula 1, M1 is at least one selected from the group consisting of B, Al, Si, Ti, and P, and 1≤a≤4, 1≤b≤8, and 1≤c≤20.

The invention discloses a preparation method of a low-cost high-nickel positive electrode material. The preparation method comprises the following steps: uniformly mixing a transition metal hydroxide precursor with a lithium source, and pre-sintering at 300-550 DEG C in an oxygen-containing atmosphere to obtain a first sintered material; uniformly mixing the first sintering material with a first additive and a second additive, and performing secondary sintering at 700-850 DEG C in an oxygen-containing atmosphere to obtain a second sintering material; crushing, centrifugally washing and drying the second sintered material to obtain a positive electrode material matrix; and uniformly mixing the positive electrode material matrix with a boron-containing compound, and carrying out low-temperature sintering at 200-400 DEG C in an oxygen atmosphere to obtain the high-nickel positive electrode material. The high-nickel positive electrode material prepared by the invention has the characteristics of high structural stability, high particle mechanical strength and excellent recycling performance.

The invention relates to the technical field of compound fertilizers, and provides a high-temperature-resistant bacteria-containing compound fertilizer and a preparation method thereof.The preparation method comprises the following steps that nanoscale freeze-dried bacterial powder is prepared from bacillus, bacillus stearothermophilus and rhodopseudomonas palustris; mixing the nano TiO2 modified SiO2 composite aerogel, diatomite, the modified charcoal, sepiolite and pullulan to prepare a microbial inoculum protection composite carrier; and mixing the freeze-dried bacterial powder with a carrier, and drying to obtain the micron-sized capsule bacterial agent. Uniformly mixing a reinforcing agent, a plasticizer and a stabilizer to prepare a performance regulator; the preparation method comprises the following steps: melting choline chloride-containing urea and monoammonium phosphate to prepare molten slurry; mixing the molten slurry with a compound fertilizer to form uniform slurry; and mixing the slurry with a micron-sized capsule microbial inoculum and a performance regulator, and granulating to obtain the high-temperature-resistant bacterium-containing compound fertilizer. By optimizing the adaptability of a microbial agent embedding carrier and a melting system, the technical bottleneck of conflict between high-temperature inactivation of the microbial agent and physical properties of a product is solved.