57results about How to "Enough buffer space" patented technology

The invention discloses a preparation method of a silicon carbon composite material and application thereof used as a lithium ion battery negative electrode material. Porous elemental silicon is prepared by taking a molecular sieve and silicon dioxide aerogel as a silicon source, metal elemental powder as a reducing agent and a low-temperature molten salt as a medium and achieving reduction of metal power on silicon dioxide during thermal processing in a certain temperature, and then the silicon carbon composite material is obtained by mixing the elemental silicon and asphalt and performing high-temperature carbon coating. Due to the porous characteristic of a raw material, the prepared silicon carbon composite material has a good three-dimensional porous structure, a good buffer effect onvolume expansion of a silicon negative electrode during the circulation process is achieved, moreover, the electron conductivity of the material after carbon coating is greatly improved, and long-term circulation stability of a silicon-based negative electrode material is facilitated. The method is low in cost of the raw material and simple in process and is suitable for industrial production ona large scale.

The invention provides a method for preparing a lithium battery negative electrode material with collagenous fiber and plant polyphenol as a biological template and a carbon source. The preparation method comprises the following steps that 1, collagenous fiber and transition metal ions react to prepare collagenous fiber loaded transition metal ions; 2, plant polyphenol is utilized for carrying out surface coating modification on the collagenous fiber loaded transition metal ions; 3, high-temperature carbonization treatment is carried out. The prepared material is black powder in appearance, and is a nanometer fiber bundle with the diameter larger than or equal to 1 micrometer composed of carbon-transition metal oxide-carbon nanofiber with the diameter of 10-150 nm. When used as the lithium battery negative electrode material, the carbon coating layer and the carbon nanofiber skeleton of composite nanofiber can form a conductive network, the transition metal oxide can be prevented from being smashed in charging-discharging circulation, the circulation stability can be improved, the excellent conductivity can be provided, and the excellent rate capability is given for the electrode material.

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a material for a lithium-sulfur battery positive electrode and a preparation method of the material. The material is a self-supporting mesoporous vanadium nitride nanowire/carbon nanotube composite material with a three-dimensional network structure. According to the material, the vanadium nitridenanowire with the mesoporous structure is connected with the carbon nanotube to form the self-supporting three-dimensional network structure; the material has high conductivity, ultrahigh specific surface area and excellent mechanical properties; and the method is simple, effective and easy to operate.

The invention relates to a secondary development board of high-speed digital picture/video signal analysis and handling option based on audio and video embedded development platform. The invention comprises a video and audio embedded development platform, the development platform standard system bus module thereof is connected with a secondary development board of the high-speed digital picture/video signal analysis and handling option through a SRDU interface. The invention can realize functions of catching, storing, and transmitting real-time video data conforming to various video standards, real-time analysis of picture/video information, picture/image decoding and encoding, special effect of pictures, etc.

The invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a novel high-performance lithium-sulfur battery positive electrode material and a preparation method thereof. The positive electrode material is a composite material of graphene with a three-dimensional foam structure and V2C Mxene. The positive electrode material is a graphene and V2C Mxene composite material with a three-dimensional foam structure, and graphene has good conductivity; the V2C Mxene has the characteristics of excellent adsorbability and electrochemical energy storage; meanwhile, the three-dimensional foam structure limits soluble polysulfide, increases active sites and forms a rapid ion channel, and the electrochemical performance of the lithium-sulfur battery is promotedthrough the combined action of the three components. The preparation method is simple, effective and easy to implement.

The invention belongs to the technical field of lithium ion battery electrode materials and preparation thereof and discloses a silicon anode material with a spherical thorn-shaped structure and a preparation method thereof, and belongs to the technical field of lithium ion battery electrode materials and preparation thereof. A silicon source compound, a hydrolyzing agent, a reducing agent and a surfactant are added into an inert solvent, the suspension liquid is transferred to a closed reaction kettle, and a silicon-oxygen material precursor is prepared through a hydrothermal method; then conductive carbon coating is conducted on a silicon oxide compound by adopting a vapor deposition method under the protection of nitrogen, and finally cooling is executed to obtain the silicon anode material with the spherical thorn-shaped structure, wherein the chemical formula of the siliconanode material is SiOx/C, and x is greater than 0 but is smaller than 1. The gram capacity of the first reversible discharge of the silicon anode material prepared by the preparation method is 2101 mAh/g and the first efficiency is 86% under the current of 0.1C, the capacity retention rate is 100% after 100charge-discharge cycles under the current of 0.5C, and the silicon anode material has excellent electrochemical performance.

The invention relates to a preparation method of a lithium battery anode material. A SnO2@/C composite material which contains fibers and adopts a hollow structure can be prepared with the method, SnO2 has enough buffering space in the charging and discharging process due to the fibers adopting the hollow structure, a C outer layer can serve as a network framework of SnO2, efflorescence of the material is reduced, the conductivity of the material is improved, the one-step method for preparation of SnO2@/SiO2@/C composite fibers is not as complicated as a traditional method in which fibers are coated after being prepared, and the SnO2@C nanofibers prepared with the method have good cyclic stability.

The invention relates to a full-dry type access optical cable which comprises an outer sheath and a sleeve. The full-dry type access optical cable is characterized in that tight tube optical fibers and a water blocking piece are laid in the sleeve, and a nonmetal reinforcing piece is arranged outside the sleeve. The full-dry type access optical cable has the advantages that the structure arrangement is simple and reasonable, the mechanical performance is good, the bending performance is high, and the full-dry type access optical cable can be conveniently laid in a corridor; the full-dry type full-medium structure is adopted, the optical cable without factice can be beneficial to divergence continuation, and construction laying, operation and use of the optical cable are facilitated; the loose tube structure of the tight tube optical fibers is adopted, enough buffer space is provided for the tight tube optical fibers, the performance of the cable is improved, divergent optical fibers are effectively protected, access construction is facilitated, and the FTTH direct-to-home requirement is met.

The invention relates to the technical field of batteries, in particular to a porous silicon/titanium dioxide/graphene composite material and a preparation method and application thereof. The invention discloses a porous silicon/titanium dioxide/graphene composite material. The porous silicon/titanium dioxide/graphene composite material comprises a titanium dioxide coated porous silicon composite material and reduced graphene oxide for supporting the titanium dioxide coated porous silicon composite material; the reduced graphite oxide is doped with a strong electronegative element. The composite material has the high lithium storage characteristic of a silicon material and the high cycle stability of a carbon material, and has the characteristics of high specific capacity, good cycle stability, excellent rate capability and safety performance, and the preparation raw materials are low in price.

The invention discloses a pet pulling device, and relates to the field of pulling devices. The pet pulling device comprises a first upper shell, a first lower shell, a second upper shell, a second lower shell, a button assembly, a rotary fixing assembly and a pull rope inlet and outlet mechanism, wherein the first lower shell and the first upper shell are integrated, the second lower shell and the second upper shell are integrated, the first upper shell and the second upper shell are relatively fixed, the first lower shell and the second lower shell are relatively fixed, the button assembly and the rotary fixing assembly are installed in the first lower shell and the second lower shell, and the pull rope inlet and outlet mechanism is installed on the side face of the first lower shell and the side face of the second lower shell. By means of the pet pulling device, damage conditions can be effectively reduced, the rope breakage probability is reduced, the use quality is improved for a user, and the service life is prolonged.

The invention relates to the technical field of new energy materials, in particular to a monoatomic dispersed in-situ growth nitrogen atom-doped carbon nanosphere graphene foam, a preparation method and application, wherein carbon nanospheres grow in situ on graphene foam, and the carbon nanospheres are doped with nitrogen atoms and metal single atoms. The preparation method comprises the following steps: preparing graphene foam on the surface of a foam metal template by adopting a vapor deposition method, then growing nitrogen-containing organic nanospheres on the surface of the graphene foam in situ, calcining, and removing the foam template in sequence to obtain the graphene foam doped with nitrogen atoms and metal monatomic carbon nanospheres through in-situ growth. When the obtained composite material is applied to the lithium-sulfur battery, the utilization rate of active substances can be greatly improved, and the overall electrochemical performance is excellent.

The invention provides a mounting structure of an A-pillar trim and an automobile body metal plate, and belongs to the technical field of automobiles. The problem that when an air curtain of an existing A-pillar trim is exploded, the A-pillar trim is prone to falling off or deforming is solved. The mounting structure of the A-pillar trim and the automobile body metal plate comprises a connecting assembly capable of positioning the A-pillar trim on the automobile body metal plate, the mounting structure comprises a buckle connected with the automobile body metal plate and a limiting block arranged on one side of the A-pillar trim, a clamping groove is formed in the buckle, the limiting block can be embedded into the clamping groove and is connected with the buckle in a clamped mode, a gap allowing the limiting block to move is formed between the limiting block and the groove wall of the clamping groove, and when the A-pillar trim panel moves towards the automobile body metal plate afterbeing not positioned with the automobile body metal plate, the A-pillar trim panel can drive the limiting block to move towards the gap. The mounting structure of the A-pillar trim and the automobilebody metal plate is small in required space, and the stability of connection between the A-pillar trim and the automobile body metal plate can be improved.

The invention relates to the technical field of rail transit, and discloses an automatic adjusting device for thermal expansion and cold contraction of the railway fastener. The device comprises a sleeper body, the sleeper body is built by concrete, two clamping plates are placed at the top of the sleeper body, the clamping plates are in a Z shape and are fixed to the sleeper body through fixing bolts, fixing holes are formed in the tops of the clamping plates, and teeth are arranged at the bottom of a base plate and openings of the fixing holes. The utility model discloses a railway fastenerthermal expansion and cold contraction automatic adjusting device. A connecting plate and a mounting block are mounted between a clamping plate and a rail; rail when heated to expand, the mounting block is pushed by the movable connecting plate to move obliquely upwards; when the installation blocks slide along the rolling wheels and the rail contracts, the connecting plates move obliquely downwards, so that the distance between the clamping plates and the installation blocks is increased during expansion, expansion space is provided for the rail, the distance between the clamping plates and the installation blocks is reduced during contraction, the rail is kept in a clamped state all the time, and the safety of the rail is improved.

The invention specifically relates to an equipment room structure of a base station. The equipment room structure is simple and has good ventilation and dust removal effects. According to the technical scheme, the equipment room structure comprises a four-surface wall body, wherein a plurality of filter screens are arranged at the lower part of the wall body, a plurality of guide plates are arranged at the upper part in an equipment room, and each guide plate is formed by two plates forming an included angle; the guide plates are arranged at the upper part of the equipment room through a crossbeam bridged on the wall body; one or more fixed beams are further arranged above the crossbeam, and one or more venting fans are arranged on each fixed beam; and a plurality of vent holes are uniformly formed in the wall body from the fixed beams to the roof, and top filter nets are mounted in the vent holes.

The invention discloses an advanced porous polymer nanosheet, a preparation method and application thereof. According to the invention, a zero-dimensional silicon dioxide molecular brush and a two-dimensional graphene molecular brush are prepared on the surfaces of zero-dimensional silicon dioxide and two-dimensional graphene by utilizing a polymer surface grafting technology, a co-assembly reaction is induced through cross-linking of the zero-dimensional silicon dioxide molecular brush and the two-dimensional graphene molecular brush, and then silicon dioxide is etched to obtain the porous polymer nanosheet, wherein a large number of polymer nanospheres with hierarchical pore structures are uniformly distributed on the surface of the prepared nanosheet, so that enough buffer space can be provided for volume change in conversion of sulfur active substances in the charging and discharging process of the lithium-sulfur battery, and graphene serving as a conductive trunk of the nanosheet can promote rapid transfer of charges so as to improve the conductivity of the electrode; the cross-linking induced co-assembly strategy can generate a large number of strong polar groups in the porous polymer skeleton, and can effectively inhibit the diffusion and loss of polysulfide; and the nanosheet shows excellent multiplying power and cycle performance when being used for a positive electrode material of a lithium-sulfur battery.

The invention provides a graphene-zinc-based oxide composite material, a preparation method thereof and application of the graphene-zinc-based oxide composite material in a lithium ion battery negative electrode material, and relates to the technical field of lithium ion batteries. The graphene-zinc-based oxide composite material provided by the invention comprises reduced graphene oxide and ZnO-ZnFe2O4 nanoparticles grown on the surface of the reduced graphene oxide, wherein the distance between every two adjacent ZnO-ZnFe2O4 nano particles is 2 to 92 nm. According to the invention, ZnO-ZnFe2O4 nanoparticles are dispersed on the surface of reduced graphene oxide, and gaps among the ZnO-ZnFe2O4 nanoparticles provide enough buffer space for volume expansion caused by intercalation and deintercalation of lithium ions, so that the material has better cycle performance and rate capability; and the reduced graphene oxide also greatly improves the conductivity of the material.

The invention relates to a condensing tower. The condensing tower comprises a shell with an inner cavity, a draught fan, a partition plate arranged in the shell, a water tank, a water spraying system, a honeycomb net device and a defroster. One end of the partition plate is fixedly connected with the upper end of the shell, and the lower end of the partition plate is fixedly connected with one end of the honeycomb net device. The other end of the honeycomb net device is connected with the side wall of the shell. The inner cavity of the shell is divided into a first cavity and a second cavity through the partition plate and the honeycomb net device. The upper end of the first cavity is of a closed structure. The upper end of the second cavity is of a shutter structure. The water tank is arranged in the first cavity and located at the lower end of the first cavity. The defroster and the water spraying system are arranged in the second cavity and connected with the shell and the partition plate respectively. The defroster is located above the water spraying system. The draught fan is arranged on the side face of the outer side of the shell and located above the water tank and below the honeycomb net device. The draught fan is communicated with the first cavity. The condensing tower has the beneficial effects of being low in water bleaching rate, good in heat exchange effect, capable of saving water, convenient to hoist, and the like.

The invention discloses a sampling storage device for medical oncology, and relates to the technical field of medical equipment. The sampling storage device comprises a bottom plate, wherein a pull rod is fixedly connected to the right side of the top of the bottom plate, a storage mechanism is fixedly connected to the top of the bottom plate, a standby liquid nitrogen tank is arranged on the right side of the storage mechanism and located at the top of the bottom plate, the storage mechanism comprises a storage box, a cover plug is clamped to the top of the storage box, the storage box comprises a shell, an inner container is embedded in the shell, the top of the inner container extends to the outside of the shell through a neck pipe and is fixedly connected with the top of the shell, a vacuum cavity is formed between the inner container and the shell, four cryopreservation frames are arranged in the inner container, each cryopreservation frame comprises a lifting rod, three buffer assemblies are fixedly connected to the outer side of the bottom of the outer wall of the lifting rod, and cryopreservation boxes are embedded in the tops of the buffer assemblies. According to the sampling storage device for the medical oncology, the shock resistance of the cryopreservation boxes is improved by arranging the buffer assemblies.

The invention belongs to the technical field of glass deep processing, and discloses a molecular sieve spacing bar, a manufacturing method and equipment. A molecular sieve in the molecular sieve spacing bar is bonded into a strip-shaped object through an adhesive; the outer surface of the molecular sieve is wrapped with a layer of adhesive, and the spacing bar which takes the molecular sieve as a supporting framework and has a certain porosity is formed through mutual bonding of the adhesive; and the spacing bar is directly bonded on glass in an online manufacturing and online placing mode to form a spacing frame. According to the molecular sieve spacing bar, the moisture absorption function is added to the spacing bar, the supporting function is added to the molecular sieve, the molecular sieve and the spacing bar are combined into a whole, the existing molecular sieve filling process is omitted, and therefore the production cost is reduced; various additives can be added into the spacing bar, and various functional strips can be compounded, so that the performance of the spacing bar is improved; and the cost of the spacing bar is not higher than that of an existing lowest aluminum alloy strip, and the performance of the spacing bar is not lower than that of an existing highest-end TPS strip and TSS strip.