30results about How to "Stable preparation performance" patented technology

The invention relates to a carbon coated lithium iron phosphate microwave-synthesizing method, relating to the preparation of anode material of a Li-ion battery. The invention weighs lithium carbonate, iron oxalate and ammonium diacid phosphate, proper amount of heat conduction agent and organic matter in chemical gauging ratio, using anhydrous alcohol as dispersant to fully grind and mix them, drying and pressing the mixture into blocks, placing the blocks in a pot holding activated carbon, and placing the pot in microwave field for irradiative heating so as to be able to make uniform- phase carbon coated lithium iron phosphate. The invention can realize carbon coating of lithium iron phosphate and more rapidly and uniformly heat the raw materials, beneficial to uniform and rapid reaction of massive raw materials. The method can shorten production cycle and reduce energy consumption.

The invention provides a microwave synthesis method of nano-lithium iron phosphate. The method mainly makes the primary particles nanometerized, the secondary particles micronized, and then performs rapid sintering and synthesis through microwaves to obtain nanometer lithium iron phosphate with uniform phase. On the one hand, it solves the disadvantages of the uneven particle size of the solid-phase method, and can achieve molecular-level mixing to obtain products with uniform particle size, achieve nanometerization of primary particles, micronization of secondary particles, and improve ion transmission rate, thereby improving its electrical conductivity. . On the other hand, through microwave sintering, the raw materials are evenly heated to obtain nano-lithium iron phosphate with uniform phase, and the sintering time is greatly reduced, saving a lot of resources and achieving the purpose of energy saving and emission reduction.

The invention discloses a two-dimensional conjugated BDF organic micro-molecular photovoltaic material, and a preparation method and an application thereof. Two-dimensional conjugated BDF organic micro-molecules with the structure represented by formula (I) are obtained by connecting a thiophene conjugate side chain-containing benzo[1,2-b;3,4-b]difuran (BDF) unit with another aryl heterocycle through a Stille coupling technology. The organic micro-molecular photovoltaic material has wide visible region absorption, suitable HOMO and LUMO energy levels and narrow band gap. Organic solar cells are produced by using the organic molecules as an electron donor and PC61BM as an electron receptor, the maximum energy conversion efficiency of the organic solar cells reaches up to 3.7%, and the organic solar cells have a good photoelectric conversion efficiency.

The invention relates to an efficient preparation method for a skutterudite thermoelectric material through laser. The efficient preparation method comprises the steps that 1, according to the chemical formula of the skutterudite thermoelectric material, pure metal powder is weighed to serve as raw material powder and is put into a graphite matrix after being uniformly mixed; 2, the graphite matrix loaded with the raw material powder is put into an inert atmosphere, and the raw material powder is heated through the laser melting technology, melted along with movement of laser spots and then condensed, so that a cast ingot is obtained; and 3, the cast ingot prepared in the step 2 is ground into powder, the cast ingot powder is sintered through spark plasmas, and thus the skutterudite thermoelectric material is obtained. According to the efficient preparation method for the skutterudite thermoelectric material through the laser, the local powder is heated through the high-energy laser, rapid melting is achieved, and the loss of Sb phases is reduced; then, small-capacity melt is rapidly condensed, and the segregation size is decreased; and subsequently, the SPS short-time heat treatment process is combined, so that efficient preparation of the skutterudite thermoelectric material is achieved.

The invention relates to the technical filed of preparation of composite coatings and discloses a preparation system and method for a multi-element composite coating. The preparation system comprises a plurality of arc sources, a magnetic field pipeline and a vacuum cavity, wherein the multiple arc sources are used for arcing various target materials respectively to generate various kinds of plasma correspondingly and making the various kinds of plasma move; the magnetic field pipeline is used for evenly mixing the various kinds of plasma through magnetic field constraint and making the various kinds of plasma reach the surface of a base body to be machined at the same time, and one end of the magnetic field pipeline is communicated with the corresponding arc source; the vacuum cavity is communicated with the other end of the magnetic field pipeline, the base body to be machined is placed in the vacuum cavity, and the various kinds of plasma enters the vacuum chamber and impacts the surface of the base body to be machined under the action of bias voltage, so that the multi-element coating is formed. According to the preparation system and method for the multi-element composite coating, the plasma generated by the multiple pure metal target materials is evenly mixed through the magnetic field mixing technique, and the surface of the base body to be machined is impacted at an accelerated speed through the plasma, so that the multi-element alloy coating is formed, and the purpose of preparing the coating which is stable in performance and uniform in element at a low cost is achieved.

The invention relates to the technical field of polymer photovoltaic materials, in particular to a fluorine-containing two-dimensional conjugate benzo-difuran and pyrazine copolymer photovoltaic material, and a preparation method and application thereof. The structural formula of the fluorine-containing two-dimensional conjugate benzo-difuran and pyrazine copolymer photovoltaic material is shown as follows (please see the specifications for the formula), wherein R is an alkyl group. A copolymer is an electronic donor material, and the fluorine-containing two-dimensional conjugate benzo-difuranand pyrazine copolymer photovoltaic material is applied to a polymer solar cell, has wide visible region absorption, the low HOMO energy level, the relative narrow band gap and the high photovoltaicconversion efficiency.

The invention discloses a method for preparing a single-walled carbon nanotube and an all-carbon heterojunction by taking graphene as a catalyst, which comprises the following steps: step 1, processing a growth substrate: s1, ultrasonically cleaning a growth substrate in ultra-pure water, acetone, ethanol and ultra-pure water in sequence; s2, blowing the growth substrate by high-purity nitrogen to dry the growth substrate; and s3, putting the cleaned substrate into a muffle furnace, performing high-temperature annealing in air, heating to 900 DEG C within 2 hours, keeping the temperature at 900 DEG C for 8 hours, cooling to 300 DEG C within 10 hours, and naturally cooling; step 2, mechanically stripping graphene on the treated growth substrate, wherein the number of layers is 1-10; step 3, growing a carbon nanotube on the substrate deposited with the graphene, and introducing hydrogen and a carbon source into a chemical vapor deposition system to grow a single-walled carbon nanotube; and 4, making the all-carbon heterojunction provided by the invention into a field effect transistor device according to the following preparation process. The single-walled carbon nanotube does not contain metal in the preparation process, and can be used for preparing a field effect transistor device with stable performance.

The invention discloses a benzodithiophene and pyrazine copolymer, a preparing method and application. The structural formula of the copolymer is shown as follows, wherein R is alkyl groups. The copolymer serves as an electron donor material, is applied to polymer solar cells, and has a wide visible region absorption range, a low HOMO level, a relatively-narrow bandgap and high photoelectric conversion efficiency.

The invention discloses a benzodifuran containing chlorine and pyrazine copolymer photovoltaic material, a preparation method and an application. A structural formula is as shown in the specification,wherein R is an alkyl group. The copolymer is an electron donor material, and is applied to a polymer solar battery, and the material has wide absorption in the visible region, a relatively low HOMOlevel, a relatively narrow band gap, and relatively high photoelectric conversion efficiency.

The invention discloses a difuronaphthalene photovoltaic material as well as a preparation method and application thereof, and belongs to the technical field of photovoltaic materials. The structure of the difuronaphthalene photovoltaic material is represented by a formula (I). The difuronaphthalene photovoltaic material is mainly prepared by linking a difuronaphthalene unit with another aromatic heterocycle or a derivative of the aromatic heterocycle through a carbon-carbon single bond by virtue of a stille coupling method. A synthetic route is simple and low in cost, and a synthetic method has universality and can be widely popularized and applied to synthesis of other difuronaphthalene materials. The prepared difuronaphthalene photovoltaic material has a big-pi-plane conjugate structure, so that a relatively wide ultraviolet-visible absorption spectrum can be obtained; the prepared difuronaphthalene photovoltaic material has a relatively low HOMO energy level and high oxygen stability and is beneficial to preparation of solar cell devices with relatively stable performance; the difuronaphthalene photovoltaic material has a good photovoltaic conversion function when being applied to solar cells. The structural formula (I) is as shown in the description.