44results about How to "Avoid structural collapse" patented technology

The invention discloses a method for preparing a graphene wrapped 3D flowerlike nickel sulfide/foamed nickel material. The method comprises the following steps: preparing a nickel sulfide/foamed nickel composite material by using a hydrothermal method, and performing vulcanization treatment on the surface of the foamed nickel by taking thioacetamide as a sulfur source so as to grow flaky nickel sulfide uniformly on the surface of the foamed nickel; wrapping the surface of the nickel sulfide/foamed nickel with a layer of graphene oxide through physical adsorption; performing thermal expansion and reduction on the adsorbed graphene oxide by using a rapid thermal expansion method, thereby obtaining the graphene wrapped composite material. The method is wide in nickel sulfide material source and simple in preparation process, the lithium extraction and insertion efficiency can be improved, and the electrochemical properties of the material can be improved; the conductivity and the structural stability of the material are improved, and the internal resistance of the material can be reduced; the electric conductivity of the material is improved, and effective pores can be provided for extraction and insertion of lithium ions due to C vacancy generated in the reduction process of the graphene.

The invention relates to the field of lithium ion battery materials, and provides an Al/La co-doped high-nickel ternary precursor with a core-shell structure and a preparation method thereof, and a positive electrode material prepared from the precursor. The preparation method mainly comprises the following three steps: step 1, synthesizing an Al-doped high-nickel ternary precursor with rod-like primary particles under the condition of a low pH value; 2, increasing the pH value on the basis of the step 1, growing a La-doped high-nickel ternary precursor shell with needle-shaped primary particles by taking the Al-doped high-nickel ternary precursor as an inner core so as to synthesize an Al/La co-doped high-nickel ternary precursor with a core-shell structure; and 3, mixing the Al/La co-doped high-nickel ternary precursor with the core-shell structure and a lithium salt, and carrying out high-temperature calcination in an oxygen atmosphere to obtain the Al/La co-doped ternary positive electrode material with the core-shell structure. Due to the unique co-doped core-shell structure, the stability of an internal structure is effectively enhanced, the generation of mixed phases such ascation mixing and rock salt structures is inhibited, the breakage of grain boundaries is reduced, the average oxidation state of manganese ions is improved, the Jahn-Teller effect is effectively inhibited, the rapid attenuation of the capacity in a cycle process is reduced, the cycle stability of the material is remarkably improved, and the cycle life of the material is remarkably prolonged. Theproduct synthesized by adopting a coprecipitation method is uniform in component, good in sphericity, good in reproducibility, easy in condition control, low in preparation cost, high in economic value and wide in application prospect.

The invention discloses a molybdenum-doped porous silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The molybdenum-doped porous silicon-carbon composite material comprises porous nano-silicon, molybdenum oxide, graphene and amorphous carbon, the molybdenum oxide and the porous nano-silicon are loaded on the graphene and are connected with the graphene through chemical bonds. According to the molybdenum-doped porous silicon-carbon composite material disclosed by the invention, molybdenum oxide and graphene are doped between the silicon-carbon materials,and the synergistic effect among the molybdenum oxide, the graphene and the silicon-carbon materials is exerted, so that the specific capacity and the cycle performance of the material are improved while the conductivity of the material is improved and the expansion is reduced.

The invention discloses a polymethyl methacrylate micropore diaphragm which is mainly applied to a lithium ion battery. The micropore diaphragm is prepared by a supercritical fluid phase separation method.

The invention discloses a lithium ion battery with a polymethyl methacrylate micropore diaphragm. The micropore diaphragm is prepared by a supercritical fluid phase separation method.

The invention belongs to the technical field of preparation of reforming hydrogen production catalysts and provides a reforming hydrogen production composite catalyst as well as a preparation method and an application thereof. The preparation method comprises the following steps: (1) mixing a mixed metal ion salt solution with a precipitant solution, and reacting; (2) carrying out aging crystallization and solid-liquid separation on a product obtained after the reaction, and taking a precipitate; and (3) roasting the precipitate to obtain the composite catalyst. According to the composite catalyst provided by the invention, the difference between the actual CO2 adsorption capacity and the theoretical adsorption capacity of the composite catalyst is further reduced, and the problems of lowactivity and poor cycling stability of the catalyst used in the CO2 adsorption enhanced CH4/H2O reforming hydrogen production process are solved.

The invention discloses a composite oxidized granular filter material and a preparation method thereof, relates to the technical field of filter materials, and solves the technical defects that the existing filter material is low in oxidant bearing capacity, easy to block gaps of an adsorbent and a granular filter material and lack of auxiliary adjuvants. The chemical active components comprise an oxidizing agent, an adsorbent and an auxiliary adjuvant, the auxiliary adjuvant comprises an alkaline agent, the oxidizing agent comprises an oxidizing agent part A infiltrating into a core skeleton and an oxidizing agent part B mixed in a core peripheral wrapping layer, the adsorbent and the auxiliary adjuvant are mixed in the wrapping layer, and the weight ratio of the oxidizing agent part A to the core skeleton is 0.1-0.3. The weight ratio of the part B of the oxidizing agent to the adsorbent is 0.1-0.2, the weight ratio of the total weight of the part B of the oxidizing agent and the adsorbent to the core skeleton is 0.3-3, and the weight ratio of the part B of the oxidizing agent to the alkaline agent is greater than or equal to 3. The content of the oxidant in the filter material is high, and the phenomenon that the oxidant crystallizes to block adsorbent gaps is reduced under the cooperation of the alkaline agent.

The invention discloses a lithium-philic alloy modification layer, a composite lithium negative electrode material, and a preparation method and application of the material, and belongs to but is not limited to the technical field of batteries. A dissimilar element M is added into molten metal lithium to obtain a molten lithium alloy Li-M, the molten lithium alloy Li-M is in contact with the surface of a metal material N, the lithium-philic alloy modification layer at least containing elements M and N is spontaneously formed on the surface of the metal material N, the lithium-philic alloy modification layer induces a liquid lithium alloy and/or liquid lithium to be adsorbed on the surface of the metal material N, and then the liquid lithium alloy and/or the liquid lithium are cooled to room temperature to obtain the solid-state composite lithium negative electrode material which has a three-layer structure containing a metal material N framework layer, the lithium-loving alloy modification layer and a Li-M lithium alloy/metal lithium layer and comprises at least three components. The preparation problem of an existing composite lithium negative electrode material and the problems of lithium dendrite growth, electrode volume expansion and structure pulverization in the circulation process are solved.

The invention discloses a construction scheme of a floating air-rib composite water-pillow pneumatic membrane structure, and belongs to the technical field of membrane structure construction. The construction scheme comprises the steps of mounting of air rib assemblies, inspection of memebrane materials, setting-out of membrane pieces, clipping of the membrane pieces, pre-assembling of the memebrane materials, heat fusion connection of memebrane material force-bearing seams, connection of the memebrane materials and an exit and entrance, edge corner treatment of the memebrane materials, treatment of the water-pillow memebrane in the memebrane materials, arranging of a supporting sling, mounting of the membrane structure and the like. The construction scheme of the floating air-rib composite water-pillow pneumatic membrane structure aims to improve the fireproof performance of the floating air-rib composite water-pillow pneumatic membrane structure while the characteristics of low costof the membrane structure and the simple construction process are prominent, and therefore, the construction scheme mainly embodies reasonable mounting of the water pillow and perfect fusion of the water pillow and the membrane structure; and no waste residue, waste gas, waste water and noise are generated in the construction process, pollution and destruction to the surrounding environment are eliminated, the attractive form of buildings, structures and public facilities can be shaped to form landscapes and scenic spots , and beautifying of the urban environment is facilitated.

The invention relates to a rolling grouser method and a rolling grouser structure. The rolling grouser method is adopted, rolling friction matching between a grouser and wheel bodies replaces traditional sliding friction matching, rollers capable of rotating transversely are fixedly disposed at the positions, where the grouser and the wheel bodies transversely and mutually butt against, on a crawler device, the rollers are matched with the side faces of the crawler wheel bodies in a rolling manner, and through rolling and butting against matching, transverse force on various wheel bodies on the crawler device is transmitted to a crawler to guide a moving direction of the crawler. The rolling grouser structure designed with the rolling grouser method is adopted to match with the wheel bodies of the crawler device, so that friction force between the grouser and the various wheel bodies can be reduced effectively, and particularly internal molecular structure heat effect caused by sliding friction of a rubber crawler is reduced, and internal molecular structural collapse caused by heat effect temperature rising of the rubber crawler is avoided effectively.

According to the positive electrode material coated with the co-embedded thin film, the preparation method and the lithium ion battery, the co-embedded thin film is deposited on the surface of the positive electrode material through an atomic layer deposition method, so that the positive electrode material coated with the co-embedded thin film is obtained. The co-embedded thin film comprises an amorphous oxide layer of phosphorus and an amorphous oxide layer of titanium. By adopting the atomic layer deposition method, the precise regulation and control of the element content and proportion can be realized, the cost is low, the coating period is short, and the PO bond in the obtained co-embedded film with the specific element proportion and content can prevent the material structure collapse caused by material deoxidation; and the amorphous oxide layer of phosphorus and residual lithium of the positive electrode material can form fast ion conductor lithium phosphate, so that the interface impedance is reduced. The amorphous oxide layer of titanium has the effect of blocking electrolyte erosion. Therefore, the positive electrode material coated with the co-embedded film and the lithium ion battery assembled by the positive electrode material have relatively high capacity and cycle performance.

The invention discloses a polypropylene microporous diaphragm which is mainly used for a lithium ion battery. The microporous diaphragm is prepared by a supercritical fluid phase separation method.

The invention relates to an additive for a flower-scented cigarette filter rod and a preparation method of the additive, and belongs to the technical field of cigarette additives. Graphene oxide is subjected to a reduction reaction through a natural reducing agent, the obtained reduced graphene oxide reacts with a flower-scented aldehyde compound and dopamine hydrochloride, then soxhlet extractionis conducted, a graphene-based composite is obtained, and finally, the graphene-based composite prepared from various raw materials is compounded into cigarette graphene-based composite microspheres.The microspheres can selectively adsorb lauric aldehyde, myristic aldehyde, undecanal, peach aldehyde and cocoanut aldehyde from complex natural essences and flavors, the adsorption capacity is controllable, the adsorption intermolecular force of the microspheres is mainly non-covalent bond force, good heat conductivity is achieved, and in the using process, desorption can be quickly conducted; and the microspheres are prepared to form the additive for the flower-scented cigarette filter rod to be added into the filter rod to be used, the flower fragrance can be provided, the cigarette flavoris enriched, the smoking quality is improved, heat subsidence can further be prevented, and application and popularization are easy.

The invention discloses a metal chain-steel fiber concrete beam component. The component is a component beam composed of a metal chain-steel plate cage and steel fiber concrete, and belongs to the technical field of steel bar concrete. The metal chain-steel fiber concrete beam component has certain energy-dissipation crack resistance capacity under impacting, exploding and other power load functions, the steel fiber concrete in the component develops deformation coordination capability of the steel fiber concrete, the metal chain-steel plate cage tightly wraps the steel fiber concrete, the purpose of bearing power load is achieved, generating and developing of cracks are further prevented, the component of the form can be applied to various structural forms, and the component can be prefabricated in a machining factory and can also be poured on-site, so that the problem that under the fact that a building structure encounters a power load function, local or whole collapsing of the structure is caused by damages of the component beam is solved.

The invention relates to a method for producing primary-color low-fat crisp mushroom chips, which belongs to the technical field of fruit and vegetable food processing. The method for producing the crisp mushroom chips comprises the following main steps of: carrying out conventional selection, root removal, slicing, washing, color protection and blanching treatment in filling liquid on a mushroomraw material; then carrying out vacuum frying dehydration and vacuum centrifugal deoiling; and finally carrying out non-fried dehydration, flavoring and packaging. In the invention, a combined treatment method for sequentially carrying out filling liquid blanching treatment, vacuum frying dehydration and non-fried dehydration is adopted. The produced crisp mushroom chips have attractive appearance and crisp taste with the maintained color, aroma and taste of mushrooms, and the oil content of a final product is below 10 percent; and compared with the traditional vacuum frying method, the invention reduces the production cost by more than a quarter and improves the production efficiency by more than 1.5 times.

The invention belongs to the technical field of road and bridge construction, and particularly relates to a movable road and bridge construction safety protection device which comprises a landing frame. The lifting mechanism is fixedly connected to the top of the landing frame, and the lifting mechanism is used for lifting a top structure; the connecting assembly is fixedly connected to the outer sides of the lifting mechanisms, and the connecting assembly is used for fixing the position between the two lifting mechanisms; the vertical rod is movably connected to the inner wall of the lifting mechanism, the arranged connecting assembly facilitates combination of the two landing frames, the weight of the structure on the bridge floor is increased, the toppling condition is avoided, after the arranged storage assembly is opened, construction tools and the like can be conveniently placed, and operation is convenient; during working, a constructor can stand on the treading bottom plate and construct or maintain the side edge of a constructed road and bridge.

The invention discloses a polyvinylidene fluoride micropore diaphragm which is mainly applied to a lithium ion battery. The micropore diaphragm is prepared by a supercritical fluid phase separation method.