32results about How to "Complete crystal structure" patented technology

The invention discloses a cobalt-free lithium-rich manganese-based cathode material as well as a preparation method and application thereof. The cathode material has a chemical formula Li[1+x]Ni[y]Mn[0.8-y]O2 (x is more than 0 and less than 1/3 and y is more than 0 and less than 0.8). The preparation method comprises the following steps: preparing a precursor in an ethanol or de-ionized water solvent by adopting a sol-gel method, pre-sintering at the low temperature, performing ball-milling, and performing high-temperature solid-phase sintering to obtain the cathode material. The cathode material prepared by adopting the method is applied to lithium ion batteries, is high in specific discharge capacity (278mAh/g) and energy density, is expected to replace commercialized mainstream products-LiCoO2 cathode materials and lithium iron phosphate power batteries, and becomes a novel material of high-specific-capacity cathode materials for electric vehicles at present.

The invention provides a high density spherical shape Co3O4 and a preparation method thereof, and relates to a Co3O4, in particular to the preparation of the high density spherical shape Co3O4, which is mainly used for preparing lithium cobaltoxide of anode material of a lithium ion battery, and also is used as Co3O4 of electronic grade, and belongs to the products of chemical industry. The invention provides a preparation method of the high density spherical shape Co3O4 with good fluidity, the prepared Co3O4 is enabled to be a spherical shape particle which has best stacking density and can effectively improve the tap density of the particle, thereby improving the electrochemistry property of the lithium ion battery and the quality of the lithium ion battery. The Co3O4 prepared by the method is a spherical shape crystal, the mean grain size is 5-25 micrometers, the loose packed density is more than or equal to 1.0g/cm<3>, the tap density is more than or equal to 2.0g/cm<3>, and the cobalt content is more than or equal to 73 percent. The process of the method is simple, and the lithium cobaltoxide synthesized by the Co3O4 presents better property, compared with the past Co3O4, the electrochemistry property of the lithium ion battery can be improved.

The invention belongs to the field of inorganic chemistry, and particularly relates to an efficient zinc phosphate micro-nano anticorrosion agent preparation method, wherein the product is applied in the field of metal heavy corrosion. According to the present invention, a cycle ultrasonic cavitation effect and a high-temperature high-pressure water bath thermal effect are adopted to perform synchronous and synergetic regulation to prepare the efficient zinc phosphate micro-nano anticorrosion agent, wherein the synchronous and synergetic effect of the two effects is adopted so as to make the product system be well dispersed, ensure the uniformity of crystal nucleation and effectively solve the difficult problem of difficult synchronous regulation on the particle size and the crystallization degree of the nanometer crystal, and a microwave heating mode is adopted to dry the product so as to reduce the agglomeration; the prepared micro-nano zinc phosphate product has advantages of high purity, complete crystallinity, narrow particle size distribution, good dispersion and the like, wherein the effective corrosion protection time of the zinc phosphate micro-nano anticorrosion agent is up to 1056 h and is far superior to the effective corrosion protection time of the commercially available zinc phosphate anticorrosion material; and the method has characteristics of simple process and low cost, and is suitable for large-scale production.

The invention provides a preparing method of a high-performance multi-sized nanostructure skutterudite material. Firstly, a high-temperature melting quenched method is adopted to prepare a thermoelectric material ingot casting, then, a simple and easily-controlled low-temperature refrigeration-grinding method is adopted to prepare nanoscale thermoelectric powder, and refrigeration-grinding is a novel grinding method. Liquid nitrogen is adopted to serve as a refrigeration medium, and the material is ground at the ultralow temperature of -195.6 DEG C. The method has the beneficial effects that the material can be ground at the temperature lower than the temperature of the brittle point of the material, and refining of powder is facilitated; inert nitrogen atmosphere provides protection atmosphere for the material, and oxidization of the material is reduced; the low-temperature liquid nitrogen can bring out a large amount of heat generated in the grinding process, and phase changes or decomposition of the material due to temperature rise is avoided; and finally, through the discharge plasma sintering technology, the high-performance nanostructure skutterudite thermoelectric material is obtained.

The invention relates to the technical field of functional materials and particularly relates to a preparation method of a polycrystalline mullite fiber. The preparation method of the polycrystalline mullite fiber comprises the following steps: carrying out reflux at 90-100 DEG C for 5-8 hours by taking water as a solvent as well as powdered aluminum and AlCl3 as raw materials, so as to obtain colorless transparent poly aluminium chloride sol; adding acidy silica sol according to a mount that m(Al):m(Si)=3:1, and carrying out vacuum concentration at 50-60 DEG C by taking 3% polyvinyl alcohol as a spinning aid so as to remove partial free water, so as to obtain precursor sol with a viscosity of 4000-6000; and preparing a precursor fiber from the precursor sol by virtue of a thread throwing method, drying the obtained precursor fiber at 60-80 DEG C for 4-6 hours, and carrying out thermal treatment at 800-1300 DEG C for 2 hours, so as to finally obtain the polycrystalline mullite fiber. The polycrystalline mullite fiber prepared by virtue of the preparation method has the beneficial effects that the crystal structure tends to be complete, the fiber diameter is 3-6 microns, and grains are uniform in size and tightly jointed.

The invention provides low specific gravity composite thermally-conductive insulating glue, which is prepared from filler, a coupling agent, epoxy resin and a curing agent, wherein the filler is prepared from graphite-like carbon nitride. The composite thermally-conductive insulating glue, which is high in heat conductivity coefficient, excellent in mechanical property, good in insulating property and low in specific gravity, is prepared by taking the graphite-like carbon nitride as main heat conduction filler, taking the coupling agent as a surface modifying agent and taking the epoxy resin as matrix.

The invention relates to the field of metal organic frameworks, and discloses a metal organic framework forming body and a preparation method and application thereof. The metal organic framework molded body comprises MOFs and a binder; wherein the amount of the binder is 0.005-1.8 parts by weight per 100 parts by weight of the metal organic framework forming body. The metal organic framework forming body is prepared by adopting a sol-gel method, so that the damage to the MOFs structure caused by granulation, briquetting or tabletting and other modes of a granulator is avoided. The metal organic framework forming body has the advantages of being high in structural retention rate, high in crushing strength, high in sulfur capacity, good in renewability and the like. The adsorbent is wide in application range, is especially suitable for removing sulfides, and has good adsorption and regeneration performances.

The invention relates to a method for microwave synthesis of a lithium iron phosphate material, and particularly discloses a method for microwave synthesis of a lithium iron phosphate material by using a waste battery. The method specifically comprises the steps of (1) selecting a waste lithium iron phosphate battery, carrying out discharge treatment on the waste lithium iron phosphate battery, and disassembling to obtain a positive plate; (2) calcining the positive plate obtained in the step (1) at the temperature of 300-500 DEG C for 1-10 hours, taking out the positive plate after the temperature is reduced to room temperature, and mechanically vibrating the positive plate to enable lithium iron phosphate to fall off from a current collector aluminum foil to obtain lithium iron phosphatepowder; and (3) mixing the lithium iron phosphate powder, a lithium source, an iron source, a phosphorus source and a carbon source, performing ball milling, performing microwave treatment for 10-100seconds, and repeating the steps of ball milling and microwave treatment until lithium iron phosphate particles are obtained. The process is simple to operate, the process is easy to control, the energy consumption is low, the method is environmentally friendly, secondary pollutants are not generated, and meanwhile, the repaired lithium iron phosphate material can be reused for producing lithiumion batteries.