49results about How to "Solve structural instability" patented technology

The invention relates to a nano carbon material with a network structure consisting of polymer chains, in particular to a nano carbon sulfur composite material with a network structure suitable to be used in a secondary lithium sulfur battery anode and a preparation method thereof. The carbon sulfur composite material is formed by adopting the following steps of: introducing functional groups onto carbon particles by adopting the electric conductivity and the porosity of a carbon material and the reaction capacity of similar condensed aromatics of the carbon material and by means of an irreversible chemical reaction; introducing the polymer chains, wherein the polymer chains are stretched, bent and cross-linked on the surfaces of the carbon particles to form a cross-linked network structure; and compounding a sulfur element or a polysulfide (m is more than 2) containing -Sm- structure into the network structure to form the nano carbon sulfur composite material with the network structure. The carbon sulfur composite material has a rich cross-linked network structure, nano-scale network pores constrain the sulfur element or the polysulfide (m is more than 2) containing the -Sm- structure in the network, and the active substances are limited in a certain region to react, so that the composite material has predominant electrochemical performance.

The invention relates to a carbon-sulfur-shell matter composite material having a network dual-core shell structure and a preparation method thereof. The carbon-sulfur-shell matter composite material has a carbon-sulfur-shell three layer structure, a central core (inner core) is nano carbon particles, sulfur elemental or a polysulfide containing-Sm-structure (m>2) is directly deposited on the nano carbon particles, or functional groups are introduced onto the nano carbon particles by use of polycyclic aromatic hydrocarbon like reaction capacity of the carbon material and through an irreversible chemical reaction, polymeric chains are introduced in, a crosslinked network structure is formed through stretching, bending and crosslinking of the polymeric chains on the surface of the nano carbon particles, the sulfur elemental or the polysulfide containing the-Sm-structure (m>2) is composited onto the crosslinked network structure to form a nano sulfur layer having a network structure, then a mono-core shell nano composite material having a network structure is obtained and is used as a second layer (outer core) of the carbon-sulfur-polymer composite material having the network dual-core shell structure, an outermost layer is a shell matter layer, electronic and/or ionic conductivity of the material are/is improved, dissolving loss of discharge products can be further inhibited, and structural stability of the material is improved. The material is suitable for positive poles of lithium sulfur batteries, and has a prominent effect on improvement of cycle stability of the lithium sulfur batteries.

The invention relates to a nitrogen-containing binder for sulfur-lithium batteries and a preparation method thereof. The binder is a nitrogen-containing cyclodextrin polymer water-based binder with a three-dimensional network structure. The existing three-dimensional network structure can well bear the mechanical pressure brought by sulfur-lithium batteries in the charging and discharging process due to volume change, introduced nitrogen-containing functional groups can effectively inhibit the problems of dissolution and shuttle effect of polysulfide ions in electrolyte, a number of hydroxyl groups exist in the cyclodextrin and have strong hydrogen-bond interaction with anode material particles, and the stability of pole pieces can be maintained. In addition, the binder also has a role of increasing guide ions. Therefore, the binder can effectively solve the problem that a positive polysulfide material in the sulfur-lithium batteries is unstable in organization structure, the utilization rate of composite material active matter and the rate capability of the active matter can be improved, and accordingly the specific power, specific energy and cyclicity of the batteries can be improved.

The invention relates to a polymer and nanometer sulfur composite material with a shell and egg yolk structure and a preparation method of the composite material. The composite material is provided with the shell and egg yolk double-layer structure, a central nucleus is formed by sulfur particles, an outer shell is formed by a polymer, a gap is preserved between the central nucleus and the shell, so that the double-layer structure like an egg shell and an egg yolk is formed; elemental sulfur is shrunk in the process that the temperature is quickly changed by using the change of crystal form and the change of density in different temperatures, and the elemental sulfur is partially dissolved and separated out by using a solvent, so that the composite material of the shell and egg yolk structure is formed. The composite material of the structure is applicable to cathodes of lithium sulfur batteries, structure collapse caused by volume expansion in the discharge process of the elemental sulfur is relieved, the dissolution and loss of discharge products are inhibited, and the electrical conductivity and circularity of the material are improved.

The invention relates to a large-span steel corrugated plate arch bridge reinforcement structure. A large-span steel corrugated plate bridge has higher requirements for the thickness of a steel corrugated plate in the aspect of stress but is influenced by production processes, so that the maximum thickness only can reach 10 millimeters and cannot meet the requirements. The large-span steel corrugated plate arch bridge reinforcement structure provided by the invention comprises steel corrugated plates which are formed by splicing single plates, a plurality of adjacent grooved steel plates are longitudinally arranged on the steel corrugated plates, the cross sections of the grooved steel plates are in a shape like the Chinese character 'ji', and notches are downward; two ends of the grooved steel plates are fixed at the peaks of the steel corrugated plates; and steel bars are arranged between the steel corrugated plates and the grooved steel plates, and concrete is poured between the steel corrugated plates and the grooved steel plates. The reinforcement structure provided by the invention can feasibly improve the requirements of the steel corrugated plate arch bridge for stress, can overcome the defect of the existing production process, namely the problem of structure instability caused by thin steel corrugated pipes, can be suitable for steel corrugated plate assembly technology, and is simple in structure, low in manufacturing cost and convenient to operate by being connected with the steel corrugated plates by bolt screwing.

The invention discloses a method for preparing a MnO@ nitrogen-doped porous carbon nanocomposite, comprising the steps of dissolving trimesic acid in deionized water at 80 degrees centigrade; maintaining a constant temperature in a water bath for a period of time; then dissolving manganese acetate in the deionized water; pouring a manganese acetate solution into a trimesic acid solution and stirring the two solutions at a constant temperature; after a constant-temperature reaction for a period of time, washing and centrifuging the reaction product to obtain a metal-organic framework, namely Mn-BTC powder; drying the Mn-BTC powder in a constant-temperature drying oven; and calcining the Mn-BTC powder in an ammonia atmosphere to obtain the MnO@ nitrogen-doped porous carbon nanocomposite. TheMnO@ nitrogen-doped porous carbon nanocomposite exhibits excellent electrochemical performance in lithium ion storage, and the porous carbon can alleviate the volume expansion of manganese oxide in alithiation process.

The invention discloses a composite positive electrode material as well as a preparation method and application thereof in a zinc ion battery. The composite positive electrode material comprises a sulfur-doped three-dimensional network structure conductive polymer/graphene/carbon nanotube composite carbon material and vanadium tetrasulfide nanoparticles loaded on the surface of the composite carbon material, wherein the surface includes at least one of an outer surface of the conductive polymer particle, a lamellar surface and an interlayer of the graphene, and an outer surface of the carbon nanotube. The composite positive electrode material disclosed by the invention is excellent in conductivity, has good cycle performance and rate capability, and has a wide application prospect in zincion batteries.

The invention discloses a silicon oxide and titanium oxide composite material and a synthesis method thereof. The composite material takes titanium oxide as a core layer and silicon oxide as a shell layer. The synthesis method comprises the following steps: mixing titanium oxide with an alcohol solvent, adding a buffer solution and a silicon source, stirring, standing, washing, drying, and finallycarrying out a heat treatment to obtain the silicon oxide/titanium oxide composite material. The provided silicon oxide/titanium oxide composite material has a core-shell structure, the shell coatingis stable and not easy to fall off, and the synthesis method is simple and feasible.

The invention discloses a silicon oxide and carbon composite material and a synthesis method thereof. The composite material takes carbon as a core layer and silicon oxide as a shell layer. The synthesis method comprises the following steps: mixing carbon and an alcohol solvent, adding a buffer solution and a silicon source, stirring, standing, washing, drying, and roasting to obtain the silicon oxide/carbon composite material. The silicon oxide/carbon composite material has a core-shell structure, the shell coating is stable and not easy to fall off, and the synthesis method is simple and feasible.

The invention relates to a gas-fired hot water boiler air circulation energy saving system which comprises a boiler body, two burners, a flue, a chimney, energy savers, a water-cooling type condenser, a secondary air type condenser and a primary air type condenser, wherein the two burners arranged at intervals in an up-and-down manner are mounted at one end of the boiler body; a flue gas outlet is formed at the other end of the boiler body, and is in sealing connection with the flue; an outlet of the flue is connected to the upright chimney; the energy savers sequentially arranged in a two-stage manner are mounted in the flue between the boiler body and the chimney; the chimney is provided with the water-cooling type condenser, the secondary air type condenser and the primary air type condenser from bottom up sequentially; an air blower is communicated with and mounted at one side of the lower part of the chimney; and an exhaust outlet of the air blower is communicated with air inlets of the burners of the boiler body through sealed pipelines. The gas-fired hot water boiler air circulation energy saving system operates stably, is safe and reliable, has strong output, is high in efficiency and low in exhaust gas temperature, reaches flue gas emission indexes, and meets the requirements of market development better.

The invention relates to the technical field of lithium batteries, and particularly discloses a ternary composite oxide matrix material, a ternary positive electrode material, a preparation method and a lithium ion battery prepared from the ternary composite oxide matrix material and the ternary positive electrode material. The ternary positive electrode material is prepared from a ternary composite oxide matrix material, the chemical formula of the ternary composite oxide matrix material is Li1+nNi0.4+xCo0.6-x-y-zAlyBzO2, x is larger than or equal to 0.00 and smaller than 0.6, y is larger than or equal to 0.01 and smaller than 0.4, z is larger than or equal to 0.01 and smaller than 0.4, x+y+z is smaller than 0.6, and n is larger than or equal to 0.00 and smaller than 0.25. The problem that manganese is dissolved out of an existing positive electrode material is solved, and the stability of nickel and the structural stability of a nickel-cobalt-aluminum material are improved; magnetic substances in the material and residual lithium on the surface of the material are removed, so that the stability of the ternary positive electrode material is improved, and the prepared lithium ion battery has good capacity performance, cycle performance and high-temperature storage performance.

The invention provides a power battery cell and a battery pack, the power battery cell comprises a battery cell body and a shell assembly, the battery cell body is arranged in the shell assembly, and an expansion gap is formed between the battery cell body and the shell assembly; and the elastic assembly is arranged in the expansion gap. The power cell solves the problem that a power cell in the prior art is unstable.