12results about How to "Moderate surface area" patented technology

The invention discloses a silicon-carbon composite material, a preparation method thereof, a pole piece, application and an electrochemical device. The preparation method of the silicon-carbon composite material comprises the following steps: S1, carrying out spray granulation on silicon-carbon precursor slurry to obtain a first precursor; wherein the silicon-carbon precursor slurry is obtained by mixing a silicon source, a carbon source, a pore forming agent and a solvent; s2, carrying out carbonization treatment on the first precursor to obtain a second precursor; and S3, carrying out carbon coating on the second precursor to obtain the silicon-carbon composite material. The battery assembled by the silicon-carbon composite material can effectively inhibit volume expansion of silicon in the silicon-carbon composite material, and the cycle performance of the battery is improved. The preparation method of the silicon-carbon composite material is high in adaptability, lower in production cost, safer and capable of achieving large-scale production.

The invention belongs to the field of battery materials, and particularly relates to a LiAlO2 coated lithium-rich manganese-based material as well as a preparation method and application thereof. The invention provides a preparation method of a LiAlO2 coated lithium-rich manganese-based material, which comprises the following steps: (1) mixing a precursor and a first lithium salt, and carrying out first sintering to obtain a first sintered material; (2) carrying out acid pickling on the first sintering material, mixing the first sintering material with an aluminum source and a second lithium salt, and carrying out second sintering to obtain a LiAlO2 coated lithium-rich manganese-based material; and carrying out acid pickling by adopting an organic acid solution. The LiAlO2 coated lithium-rich manganese-based material prepared by the preparation method disclosed by the invention is low in specific surface area, high in first efficiency and good in cycle performance.

The invention relates to the technical field of separation and purification, in particular to a preparation method of a high-purity scandium oxide adsorbent with a mesoporous silicon-based shell, and aims to solve the technical problems in the prior art. According to the silicon-based adsorbent, the preparation method of the silicon-based adsorbent and the application of the silicon-based adsorbent to adsorption of associated impurities of scandium in rare earth ore liquid, the silicon-based adsorbent containing aluminum is large in scandium ion adsorption capacity and good in selectivity and has good application prospects in the aspect of a rare earth purification process. In order to solve the technical problem, the scheme provided by the invention is as follows: the adsorbent takes amorphous mesoporous silica as a skeleton, and organic functional group solvent mixing treatment is performed after the amorphous mesoporous silica is synthesized, so that resin groups are uniformly distributed on the surface of the skeleton and in the skeleton.

The invention relates to the technical field of batteries, in particular to a composite negative electrode material as well as a preparation method and application thereof. The composite negative electrode material comprises an inner core matrix and a composite layer arranged on at least part of the surface of the inner core matrix, the inner core matrix comprises graphite; the composite layer comprises a complex of porous titanium oxide, a conductive carbon material and a lithium phenyl sulfonate compound. According to the composite negative electrode material, through coating of the composite layer, the cycle performance and the rate capability of the composite negative electrode material can be improved, and the composite negative electrode material is good in fast charging performance and high in safety performance.

The invention provides a lithium manganate positive electrode material and a preparation method thereof, a positive plate and a battery, and belongs to the technical field of batteries, the structural general formula of the lithium manganate positive electrode material is Li1 + xMyMn2-(x + y) O4, x is greater than or equal to 0.1 and less than or equal to 0.33, y is greater than or equal to 0.005 and less than or equal to 0.01, M comprises at least one of Co, Ni, Cr and Fe, and the 111 crystal face diffraction peak intensity I111 of the lithium manganate positive electrode material is greater than 3100. According to the lithium manganate positive electrode material, the energy density, the effective gram volume and the structural stability of the lithium manganate positive electrode material, especially the performance of the lithium manganate positive electrode material in a low-voltage range of 2.0-3.3 V, are improved through lithium enrichment, doping of a proper proportion of M elements and synergistic cooperation of 111 crystal face diffraction peak intensity of the lithium manganate positive electrode material, so that the energy density, the effective gram volume and the cycling stability of the battery are improved, and the battery performance is improved. The battery service life is prolonged.

This invention relates to the field of battery technology, specifically to a composite anode material, its preparation method, and its applications. A composite anode material includes a carbon material matrix and a coating layer disposed on the surface of the carbon material matrix. The coating layer contains amorphous carbon and a dual-conductor composite. The dual-conductor composite has a core-shell structure, with the core layer containing a carbon-based conductive agent and the shell layer containing a fast-ion conductor. The composite anode material of this invention, through the synergy of the various layers, can further improve the fast-charging performance of the anode material and enhance the battery's capacity and cycle performance.

This invention relates to the field of comprehensive utilization technology of iron and steel smelting resources, specifically to a method for the direct recycling and utilization of iron-rich red mud in converter steelmaking. The method includes the following steps: Step 1: Retaining slag, including MgO, in the converter for slag splashing and furnace protection; Step 2: Adding fine-grained limestone to the converter; Step 3: Adding iron-rich red mud to the converter, and shaking the converter 2-3 times after the mud has been added; Step 4: Verticalizing the converter and blowing nitrogen into it at least once using a top-blowing method, with each blowing lasting 3-5 seconds and an interval of 10 seconds between each blowing; Step 5: Adding scrap steel to the converter, waiting 0-5 minutes, then adding molten iron and starting the blowing process. This invention directly applies iron-rich red mud to the converter steelmaking process, achieving dephosphorization of molten iron with high phosphorus content without the use of flux.

This invention relates to the field of traditional Chinese medicine technology, specifically to a method for preparing concentrated Astragalus membranaceus pills and its application, including the following steps: (1) preparing a clear extract by alcohol extraction; (2) making pills by plastic molding; (3) drying the pills at a constant temperature. In the pill-making process, this invention selects 100-mesh Astragalus membranaceus mixed fine powder and adopts a mass ratio of clear extract to fine powder of 1:2. Since the 100-mesh powder has a uniform particle size and a moderate specific surface area, it can fully contact and bond with the clear extract, avoiding the problem of the pills being rough and cracked due to excessive particle size and the pills being too fine due to excessive moisture dissipation. The 1:2 ratio makes the soft material suitable for its softness and hardness, so that it will not be loose and difficult to form due to excessive powder ratio, nor will it cause adhesion and blockage of the mold due to excessive clear extract ratio. Combined with the gradient humidity soft material preparation technology, 60% purified water is added first and mixed evenly, and then the remaining water is added in two batches. Low-frequency vibration is applied simultaneously for mixing, which can make the internal humidity of the soft material uniform and the bonding force stable, thereby obtaining wet pills with smooth surface, round shape and no cracks.

The invention belongs to the field of material chemistry, and discloses a nitrogen-doped zinc-based adsorbent, a preparation method of the nitrogen-doped zinc-based adsorbent and application of the nitrogen-doped zinc-based adsorbent in radioactive cesium removal, and the preparation method of the nitrogen-doped zinc-based adsorbent comprises the following steps: step 1, preparing a ZIF-8 precursor with a dodecahedron structure; step 2, preparation of HNZOR or HNZSS: dispersing the ZIF-8 precursor obtained in the step 1 in a solvent, carrying out a low-temperature hydrothermal reaction at 150-200 DEG C, collecting a product after the reaction is completed, washing and carrying out vacuum drying to obtain HNZOR; the preparation method comprises the following steps: dispersing HNZOR in water, carrying out secondary low-temperature hydrothermal reaction in an ammonium hydroxide environment at 120-180 DEG C, collecting a product after the reaction is completed, washing and carrying out vacuum drying to obtain HNZSS; and 3, activating the HNZOR or HNZOR obtained in the step 2 by using potassium salt containing K < + >, and after activation is completed, washing and drying to obtain the nitrogen-doped zinc-based adsorbent. The adsorbent disclosed by the invention can be widely applied to removal and enrichment of Cs < + > in nuclear power plant wastewater, accident emergency water bodies and high-salt complex waste liquid.

The invention provides a pyraclostrobin thioneb water dispersible granule and a preparation process thereof, and belongs to the technical field of pesticide preparations. The preparation process comprises the following steps: loading pyraclostrobin thioneb on modified tungsten trioxide nanoflowers; the micro-capsule of the tungsten trioxide nanoflower loaded with the pyraclostrobin metiram is flexible; preparing a polymer binder; preparing a nano auxiliary agent; and preparing the water dispersible granules. Pyraclostrobin thioneb is loaded by tungsten trioxide nanoflowers, and the tungsten trioxide nanoflowers have unique optical performance, can absorb and scatter light rays such as ultraviolet rays and reduce direct irradiation of the light rays to pyraclostrobin thioneb, so that decomposition and failure caused by photolysis of the pyraclostrobin thioneb are reduced, the validity period and the lasting period of the pesticide are prolonged, and the pesticide is safe and environmentally friendly. Meanwhile, the slow release speed of pyraclostrobin thioneb can be adjusted after modification of polyethylene glycol and lauryl sodium sulfate, so that the pesticide can continuously exert the pesticide effect on the surfaces of crops.

The invention belongs to the field of bone implants, and relates to a drug-loaded bone implant and a preparation method thereof. The bone implant disclosed by the invention is composed of a porous scaffold and medicine-containing hydrogel, wherein the porous scaffold is formed by 3D printing of polylactic acid; the medicine-containing hydrogel is prepared from diclofenac sodium, sodium alginate, calcium carbonate, gluconolactone and water. The porous scaffold provided by the invention not only provides mechanical support for a bone defect part, but also can fix the medicine-containing hydrogel so that the medicine-containing hydrogel plays a role; and the mechanical strength, the drug loading capacity and the drug release behavior can be adjusted by changing the column spacing. Meanwhile, the water-containing hydrogel disclosed by the invention can be uniformly injected into the porous scaffold and can be quickly solidified, and additional physical and chemical crosslinking is not needed. According to the drug-loaded bone implant and the preparation method thereof provided by the invention, in the whole diagnosis, design, preparation and use processes, the requirements of personalized implantation and medication in the orthopedics department are met, on-demand anti-inflammatory analgesia after operation can be realized, and the drug-loaded bone implant has a wide market application prospect.

The invention relates to the technical field of secondary batteries, in particular to a precursor material for preparing a single-crystal positive electrode material, a preparation method of the precursor material, the single-crystal positive electrode material and a secondary battery. The precursor material has a hollow structure and comprises a shell and a core material positioned on the inner surface of the shell; the core material comprises a hydroxide containing a fluxing element A, and A comprises at least one of Sr, Y, Ba and Ce; the core material also comprises at least one of Ni, Mn, Co and Fe; the shell comprises a hydroxide containing at least one of Ni, Mn, Co and Fe; and the D50 particle size R3 of the precursor material is more than 4.5 mu m and less than or equal to 18 mu m. The large-particle-size precursor material is hollow inside and compact outside, and the core material contains a fluxing element A, so that growth and cracking of single-crystal particles during high-temperature roasting are facilitated, and micron-sized single-crystal positive electrode particles can be sintered without higher sintering temperature or excessive lithium salt or molten salt.