45 results about "Silicene" patented technology

The embodiment of the invention relates to a lithium battery negative electrode material containing a pre-lithiated silylene material, a preparation method and a lithium battery. The negative electrode material has a core-shell structure, wherein an inner core is a mixture of the pre-lithiated silylene material and carbon particles, and an outer shell is one or more carbon-containing layers; the mass ratio of the inner core to the negative electrode material is [80%, 99%]; the mass ratio of the pre-lithiated silylene material in the inner core to the inner core is [10%, 90%]; the mass ratio ofthe outer shell to the negative electrode material [1%, 20%]; the pre-lithiated silylene material is of a sheet structure, and a phase comprises nano silicon and / or silicon oxide and lithium silicate; and the lithium silicate is one or more of Li4SiO4, Li2SiO5 and Li2SiO3. The negative electrode material effectively alleviates the expansion problem of the negative electrode material through the flaky characteristics of silylene or silylene oxide; by lithiating the silylene material in advance, the first charge-discharge efficiency of the negative electrode material is improved; and through carbon coating on the surface layer, the negative electrode material has the advantages of long cycle and high cycle stability.

The invention provides a two-dimensional material heterojunction and a performance analysis method thereof, and application of the heterojunction in semiconductor and photoelectric energy conversion.The two-dimensional material heterojunction comprises a first two-dimensional material and a second two-dimensional material, wherein the first two-dimensional material comprises a Janus two-dimensional material; and the second two-dimensional material comprises silylene; and the first two-dimensional material and the second two-dimensional material are longitudinally stacked. According to the heterojunction provided by the invention, the excellent performance of different materials can be utilized; the defect of a single two-dimensional material can be overcome, and the band gap of silylene is opened through the interaction of the Janus two-dimensional material and the silylene, so that the energy spectrum distribution of the two-dimensional material is obviously changed relative to the respective independent properties of the two components forming the two-dimensional material. According to the performance analysis method of the heterojunction, electron energy loss spectrum analysisis carried out based on the time-containing density functional theory and random phase approximation, the steps are simple, operation is easy, and a rapid analysis approach and powerful support are provided for heterojunction design with band gap opening as the purpose.

The invention relates toa recycled regenerated plastic for 3D printing. The recycled regenerated plastic comprises 60-70 parts of recycled regenerated plastic, 5-20 parts of glass fiber, 3-10 parts ofa graphene-like material, 1-10 parts of a toughening agent, 2-3 parts of a dispersant, 1-15 parts of biochar, 1-5 parts of a compatibilizer, 0.1-2 parts of a chain extender, 0.5-1 part of a lubricant, 0.1-5 parts of a foaming agent and 1-8 parts of other additives. In addition, the recycled regenerated plastic may also comprise 10-60 parts of EVA (an ethylene-vinyl acetate copolymer), and the content of VA (vinyl acetate) inEVA is 20-55%. The graphene-like material is one of silicene, germanene and molybdenum disulfide which are subjected tosurface activity treatment. The chain extender is one or more of pyromellitic dianhydride, dicumyl peroxide and acrylonitrile-butadiene-styrene copolymer grafted oxazoline. The recycled regenerated plastic is one or more of ABS (acrylonitrile butadienestyrene), polypropylene and PET (polyethylene terephthalate).

The invention discloses a silylene negative electrode plate capable of being directly used for preparing a lithium ion battery, a preparation method of the silylene negative electrode plate and application of the silylene negative electrode plate in preparation of the lithium ion battery. The preparation method comprises the following steps: (1) mixing and dispersing a silicon precursor, conductive carbon black and a binder in a solvent, performing ultrasonic treatment and stirring to form slurry, coating a current collector with the slurry, and performing vacuum drying to remove the solvent to obtain an electrode plate, wherein the silicon precursor is CaSi2 or MgSi2; and (2) inserting a platinum wire serving as a cathode or an anode into an electrolyte containing inorganic acid and an organic solvent, constructing an electrochemical reaction tank by taking the electrode plate prepared in the step (1) as the anode or the cathode, carrying out electrochemical reaction, cleaning the surface of the electrode plate after the reaction is finished, and carrying out vacuum drying to obtain the silylene negative electrode plate which can be directly used for preparing the lithium ion battery. The electrochemical reaction conditions are as follows: the current density is greater than or equal to 1mA / cm < 2 > and less than or equal to 300mA / cm < 2 >, and the reaction time is greater than or equal to 1min and less than or equal.

The invention relates to a composite microsphere based on a two-dimensional nano silylene sheet, graphitized carbon nitride and a coated carbon material and a preparation method of the composite microsphere, the material is of a pomegranate-like core-shell structure, the diameter is 5-20 microns, and the composite microsphere is mainly applied to the field of lithium ion battery negative electrodes. The preparation method comprises the following steps: 1) performing hydrothermal reaction on a carbon-nitrogen-containing organic material in alkali liquor, and calcining to obtain lithiated graphite phase carbon nitride; 2) uniformly and tightly compounding the silylene nanosheet and graphite phase carbon nitride in a solvent environment through an electrostatic self-assembly process; and 3) adding a carbon precursor for coating, and carrying out high-temperature calcining forming. The composite microsphere prepared by the preparation method disclosed by the invention is beneficial to the unique structure and valence bond form of the silylene nanosheet, the defect that the expansion rate of a silicon-based negative electrode material is too high is fundamentally overcome, and the synergistic effect of silylene and graphite-phase carbon nitride is fully utilized, so that the novel negative electrode material has the advantages of high specific capacity, long cycle life and the like; and the preparation process is simple, low in cost and suitable for industrial production.

A silicene electronic device includes a silicene material layer. The silicene material layer of the silicene electronic device has a 2D honeycomb structure of silicon atoms, is doped with at least one material of Group I, Group II, Group XVI, and Group XVII, and includes at least one of a p-type dopant region doped with a p-type dopant and an n-type dopant region doped with an n-type dopant. An electrode material layer including a material having a work function lower than the electron affinity of silicene is formed on the silicene material layer.

The invention discloses a silicene film prepared by mechanical peeling and the application of the obtained silicene film in batteries. The two-dimensional nanomaterials are physically covered on the passivated silicon surface of the metal film. After high-temperature treatment, the silicon element diffuses into the two-dimensional The interface between the nanomaterial and the metal film is lowered to room temperature, and the sample is dispersed in a solvent liquid with a surfactant. Polar molecules are very easy to enter the interface between the metal film and the substrate material, and the metal film and the substrate are increased by ultrasonic stirring. Material friction, peeling two-dimensional nanomaterials and silicene from silicon substrates to obtain silicene films. The present invention utilizes mechanical stripping to peel off the silicene thin layer in the liquid phase through physical action, which protects the physical properties of the silicene material, avoids the working environment of high vacuum and high-risk gas, and avoids highly toxic organic reactants The use of two-dimensional nanomaterials can be used repeatedly, which reduces the cost and has broad market application value in the field of solar cells.

The invention provides a method for preparing silene. The method specifically comprises: processing silicon blocks into a concave tapered silicon target; mounting the silicon target on a sputtering target of a cesium sputtering negative ion source; sputtering the silicon target by using cesium ions; leading out Si<2-> cluster negative ion beams generated by sputtering from extraction electrode extraction holes, wherein Si<2-> cluster negative ions are uniformly deposited on an Ag (111) substrate through scanning electric field after being accelerated by extraction electrode voltage; and putting a sample into a vacuum chamber, sputtering the surface of the sample by Ar<+> ions, and then carrying out annealing treatment on the sample in an ultrahigh vacuum to finish the preparation of silene. According to the preparation method provided by the invention, by using the advantages of low energy of a single atom of low-energy cluster negative ion beams, and an accurate and controllable dose, the silene can be prepared directly by virtue of a direct deposition method.

The invention discloses a method for preparing silylene by carbene-induced halogenated silane dehydrohalogenation, and relates to a method for synthesizing silylene. Dilithium salt of [NN] bidentate ligand and halogenosilane or substituted halogenosilane organic silicon reagent react to form substituted halogenated silane; and the molar ratio of the substituted halogenated silane to stable carbene is 1:0.5-10, the reaction temperature is between 78 DEG C below zero and 100 DEG C, the substituted halogenated silane and the stable carbene are mixed in a common organic solvent to generate imidazole salt of silylene and carbene, the generated imidazole salt is separated from the solution of a product through filtration after the reaction is finished, and the silylene or derivatives of the silylene are obtained through recrystallization and chromatographic separation. Through the reaction of different organic halogenosilane hydrides and the carbene, the method discovers that the carbene can effectively reduce a silicon compound under the mild condition to generate bivalent silicon intermediate. The imidazole salt as the reaction product can be converted into the carbene more easily so as to realize recycle.