80results about How to "No annealing required" patented technology

A stainless heat-proof self-protecting flux-cored wire for a magnesium smelting reduction tank belongs to the technical field of materials processing engineering. A normal stainless steel band 304L or common carbon steel serves as a coating layer, and alloys in a powder core are rutile, sodium carbonate, feldspar, compound fluorides, chromium, nickel, manganese, molybdenum, chromium nitride, aluminium-magnesium alloy, misch metal and iron power. Compared with a conventional stainless steel welding rod, the stainless heat-proof self-protecting flux-cored wire has the advantages that higher welding current can be used; higher welding speed can be realized; the production efficiency is improved; and the labor intensity is lowered; c. Compared with a conventional stainless steel submerged-arc welding solid wire, the stainless heat-proof self-protecting flux-cored wire has the advantages that all-position welding can be realized; the heat input is small; the slag detachability is good; and the manufacturing technique is simpler. A welded joint formed by using the stainless heat-proof self-protecting flux-cored wire provided by the invention has favorable heat resistance, oxidation resistance, vulcanization and corrosion resistance and high-temperature creep resistance compared with welded joints formed by welding the stainless steel welding rod and the stainless steel solid wire.

The invention relates to a laser cladding repair process for cross shafts. The process comprises the following steps of: A. carrying out treatment on the surface of the cross shaft, and carrying out failure analysis; B. carrying out 80-150 DEG C overall preheating on the cross shaft; C. according to failure analysis results of the cross shaft, optimizing process parameters, and carrying out laser cladding, wherein adopted alloy powder comprises the following components in percentage by weight: less than or equal to 0.1% of C, 10-13% of Cr, 1.5-2.5% of B, 1-2% of Si, 0.5-1.2% of Mo, 8-12% of Mn, 6-12% of W, 5-15% of TiO2, and the balance of Fe; and D. carrying out detection. According to the laser cladding repair process for the cross shafts, disclosed by the invention, through carrying out the laser cladding on the surface of the cross shaft, the size of the cross shaft can meet the application requirements, and the hardness and the wear resistance of the cross shaft subjected to repair exceed the original hardness and the original wear resistance of the cross shaft.

The invention relates to a gear laser repair process which comprises the following steps: A. treating the surface of a gear, and performing failure analysis on the gear; B, integrally preheating the gear at 80-120 DEG C, and locally preheating the to-be-repaired part of the gear at 180-220 DEG C at the same time; C, optimizing process parameters according to the failure analysis result of gear, performing layer-by-layer laser cladding, wherein the thickness of each cladding layer is less than or equal to 0.4 mm, the edge of the next cladding layer is extended outwards from the edge of the previous cladding layer by 4-6mm, and the used alloy powder comprises the following components in percentage by weight: no more than 0.5% of C, 38-52% of Cr, 1.5-2.5% of B, 0.5-1.5% of Si and the balance of Fe; and D, detecting. According to the gear laser repair process, the surface of the gear is subjected to laser cladding, so that the size meets the use requirements, and the hardness and wear resistance of the repaired gear exceed the original properties.

The invention discloses a bulk heterojunction organic thin-film solar cell and a preparation method thereof. The cell has an inverted structure and is composed of a transparent substrate, a transparent cathode, a cathode modification layer, an active layer, a hole transmission layer and a metal anode which are arranged from the bottom to the top in turn. The modification effect of hindered amine light stabilizer material to the transparent electrode is utilized so that the work function of the transparent cathode is reduced, energy level of the transparent cathode is coordinated, cathode interface barrier is reduced and electron transmission and collection capability of the cathode is enhanced. Besides, the suppression effect of the hindered amine light stabilizer to photochemical reaction is utilized so that stability of the cathode interface is also enhanced by the modification layer and aging resistance of the cell can be enhanced. The modification layer is prepared by a spin coating and self-assembling method so that the preparation technology is simple. Besides, the light stabilizer is material of mass industrial production so that reduction of cost of the solar cell is facilitated.

The invention discloses full-biodegradable modified plastic for a plastic-absorbing thin-walled product and a preparation method of the full-biodegradable modified plastic. The full-biodegradable modified plastic for the plastic-absorbing thin-walled product is prepared from the following raw materials, by mass: 75 to 85 parts of PLA, 20 to 30 parts of PBS and / or PBAT, 10 to 30 parts of a filler,0.5 to 1 part of a nucleating agent, 1 to 3 parts of crystallization promoter, 0.3 to 0.5 part of a chain extender, 2 to 5 parts of a compatibilizer, 0.3 to 0.5 part of a terminating agent and 0.5 to2 parts of a color regulator. According to the invention, PLA is modified by using PBS and / or PBAT, and the nucleating agent, the crystallization accelerator, the chain extender, the compatibilizer, the terminator and the filler are added, so that the obtained material has high thermal deformation temperature and good mechanical properties; the preparation process is simple, annealing treatment isnot needed, the technological process is simplified, and the production cost is reduced.

The invention discloses a method for preparing WO3 electrochromic film by potentiodynamic electrochemical deposition, and belongs to the technical field of functional materials. The method comprises the following steps: adding an appropriate amount of tungsten powder into hydrogen peroxide for completely dissolving to prepare a peroxotungstic acid solution; adding an appropriate amount of ethanol and acetic acid to be stirred fully to obtain a stable mixed solution. The peroxotungstic acid solution prepared in the invention is relatively stable and can be placed for one month at normal temperature for continuous use; the method for preparing the WO3 film by potentiodynamic electrochemical deposition is low in cost, simple in process, free from annealing, uniform in film formation, and high in repeatability; the prepared film has excellent electrochromic and optical properties, thereby providing a new idea for development and industrialized production of an energy-conversing and efficient low-cost WO3 film technology.

The invention discloses a medical zinc alloy stent and a production method thereof, and belongs to the technical field of medical materials. The alloy element content of the stent is low, and wires ofthe stent have continuous drawing high plasticity and annealing strength toughening effects that other biomedical degradable alloy wires do not have. According to the characteristics, the continuousdrawing zinc alloy wires in the stent can be woven into a stent product through a seamless connection stent weaving machine, and the production efficiency is extremely high. After the woven stent is annealed, the structural strength is greatly improved, the radial supporting force of the stent is increased, and the internal stress caused by drawing and weaving in the zinc alloy wires is weakened.The above characteristics are sufficient to indicate that the medical zinc alloy stent and the production method thereof can realize large-scale high-efficiency production; and due to the high plasticity of the wires after drawing, the forming breakage rate of the stent product is low, and a high stent yield can be maintained.

The invention discloses a method for depositing a metal elementary substance thin film by atmospheric cold plasmas. The method comprises the following steps:step 1, mixed gas is excited and ionized togenerate the atmospheric cold plasmas, and the atmospheric cold plasmas form plasma light flame in a cavity of a nozzle; step 2, a metal compound solution is atomized and then enters the cavity of the nozzle; and step 3, under surrounding protection of the protective gas, the plasma light flame and fog drops generate action, solvent in the fog drops is evaporated, a metal compound in the fog drops is reduced into metal particles, and the metal particles are sprayed onto a substrate to be deposited to form the continuous metal elementary substance thin film. According to the method, the metalelementary substance thin film can be deposited under normal pressure, reaction temperature is low, the method is suitable for a heat sensitive substrate, a vacuum or closed deposition chamber is notneeded, so that the size of the substrate is not limited by space, and application range of the method is expanded; and the metal elementary substance thin film prepared by the method is stable in property, post-processing is not needed, so that the technological process is shortened, and production efficiency is improved.

The invention relates to a production method of a high-plasticity steel wire rod for welding, comprising the steps of heating, descaling, rough rolling, pre-finish rolling, finish rolling, spinning, cold control, cooling and transportation. The strength of steel for welding is reduced and the plasticity is improved through such methods as rolling temperature control, rolling mill cooling water control, air volume control and insulation measure; and the generation of bad phenomenon in the drawing machining process is effectively improved.

The invention discloses a high-color-rendering-index and high-luminous-efficiency complex-phase fluorescent ceramic for LED / LD illumination, and a preparation method thereof. The chemical general formula of the complex-phase fluorescent ceramic is a(CexY1-x)3Al5O12-b(EuyY1-y)2O3 or c(CexY1-x)3Al5O12-dEuzSr1-zAlSi4N7. The preparation method comprises the following steps: preparing Ce:YAG fluorescent powder, mixing and ball-milling the Ce:YAG fluorescent powder, commercial Y2O3:Eu<3+> powder or commercial SrAlSi4N7:Eu<2+> powder, a dispersing agent and anhydrous ethanol according to a certain ratio, and drying and sieving a mixed slurry obtained by ball-milling; and calcining the sieved powder, carrying out spark plasma sintering, cooling to room temperature, and carrying out double-sided polishing treatment to obtain the complex-phase fluorescent ceramic. The complex-phase fluorescent ceramic material emits low-color-temperature high-color-rendering-index white light under the excitation of an LED (300-500 mA) / LD (2-10 W), the main emission peaks are 530-550 nm and 600-640 nm, the relative color temperature is 2500-3700 K, the color rendering index is 80 to 88, and the visual luminous efficiency can reach 290-350 lm / W. The complex-phase fluorescent ceramic is simple in preparation process and easy for industrial production.

The invention discloses a Bragg fiber grating temperature sensor, a temperature monitoring system and a monitoring method of the temperature monitoring system, wherein the Bragg fiber grating temperature sensor, the temperature monitoring system and the monitoring method of the temperature monitoring system belong to the field of high-voltage power transmission converter valve thyristor temperature monitoring. The Bragg fiber grating temperature sensor comprises a high-voltage-resistant insulating protecting sleeve, a fiber connector, a packaging metal housing, a photosensitive fiber and a Bragg fiber grating. The photosensitive fiber is divided into a front part and a back part. The high-voltage-resistant insulating protecting sleeve is arranged outside the front part of photosensitive fiber. Furthermore the end of the front part of the photosensitive fiber is connected with the fiber connector. The Bragg fiber grating is arranged at the end of the back part of the photosensitive fiber. The packaging metal housing is arranged outside one end, which faces the Bragg fiber grating, of the high-voltage-resistant insulating protecting sleeve. A temperature condition in the thyristor housing can be monitored and reflected in real time. The Bragg fiber grating temperature sensor, the temperature monitoring system and the monitoring method of the temperature monitoring system have advantages of small size, small error, high insulating performance, high reliability, high linearity, convenient and quick mounting, etc.

The invention relates to a method for preparing a vanadium dioxide film through magnetron sputtering at a low temperature. According to the method, the vanadium dioxide film is formed on a substrate with a Cr2O3 layer through magnetron sputtering, and the temperature of the substrate is 200 DEG C or below, optimally, 150 DEG C-200 DEG C. The Cr2O3 layer (the Cr2O3 buffer layer) material adopted inthe method is transparent in a visible light area and low in crystallization temperature, the lattice constant and the structure are matched with those of VO2 well, the Cr2O3 layer material can playa role of a template in growth induction in the growing process of vanadium dioxide, and therefore the preparation temperature of a VO2 film can be remarkably reduced.

The invention discloses a preparation method of inorganic perovskite solar cell with indium sulfide thin film and a product thereof. The preparation method of the inorganic perovskite solar cell disclosed by the invention has the advantages of low preparation temperature, convenient and simple preparation conditions, no annealing and the like, so that the inorganic perovskite solar cell can be directly prepared on a flexible substrate, thereby preparing a solar cell with high photoelectric conversion efficiency. The solar cell prepared by the invention comprises a transparent conductive FTO base layer, an In2S3 electron transport layer, a CsPbIBr2 perovskite light absorbing layer, a Spiro- An OMeTAD hole transport lay and a metal back electrode, As that electron transport lay, In2S3 is helpful to form the high quality perovskite absorbing lay, and the conduction band of the In2S3 electron transport layer is close to that of the CsPbIBr2 perovskite absorbing layer, which can reduce theopen-circuit voltage los of the solar cell to a certain extent, thereby improving the photoelectric conversion efficiency of the solar cell.

The invention discloses a class of electroluminescent materials, a preparation method and applications thereof. According to the present invention, the sulfur oxygen fluorine and benzene unit is a seven-membered fused ring structure, wherein the good planarity easily achieves the injection and transport of carriers, and improves the photoelectric properties of the material; the bicyclic structurecan make the sulfur oxygen fluorine and benzene unit have good rigidity so as to easily improve the heat resistance of the material and meet the practical needs of the materials; and the electroluminescent material based on the sulfur oxygen fluorine and benzene unit and obtained through Suzuki coupling reaction, Ullmann coupling reaction, still coupling reaction and the like has good solubility,can be dissolved with common organic solvents, can form a film through spin coating, ink jet printing or printing, and can be prepared into the light emitting layer of light-emitting diodes.

The invention discloses an electroluminescence polymer as well as a polymerization monomer and preparation method and application thereof. The electroluminescence polymer has a structure as shown in formula (II) in the Description, comprises heteroatoms, is capable of increasing the yield of fluorescence quantum and the carrier transport capacity of a light emitting material, and is beneficial toa light emitting device for obtaining efficient and stable light emitting device properties. The electroluminescence polymer disclosed by the invention is relatively good in dissolubility, can be dissolved with common organic solvents and can be formed as a membrane through spinning, ink injection or printing, and a light emitting layer of a light emitting diode can be prepared. (Refer to Description).

The invention belongs to the technical field of organic photoelectricity and discloses electroluminescent materials based on carbazole five-membered heterocycle units as well as a preparation method and an application of the electroluminescent materials. The materials have the chemical structural formula shown in the description, wherein X is O, S, Se, Te or N-R; R is the same or different and isC1-20 straight-chain, branched or cyclic alkyl or alkoxy, C2-20 straight-chain, branched or cyclic alkenyl, straight-chain, branched or cyclic alkynyl, straight-chain, branched or cyclic alkyl carbonyl, aryl or heteroaryl, aralkyl or heteroaryl alkyl, aryloxy or heteroaryloxy, aryl alkoxy or heteroaryl alkoxy with 4-20 annular atoms, triphenylamine or derivatives thereof, carbazole and derivativesthereof, phenoxazine and derivatives thereof, phenothiazine and derivatives thereof, pyridine and derivatives thereof, oxadiazole and derivatives thereof and benzimidazole and derivatives thereof; Arl-Ar8 are one of conjugated or non-conjugated structural units.

The invention discloses a hyperbranched electroluminescent polymer as well as a polymerization monomer, a preparation method and application thereof, and belongs to the technical field of organic photoelectricity. The structure of the electroluminescent polymer is shown as a formula (II), and a sulfuryl-containing three-dimensional asymmetric polycyclic aromatic structure can improve the thermal stability, the fluorescence quantum yield and the carrier transport capability of a luminescent material, so that a luminescent device can obtain efficient and stable luminescent device performance; and the polymer has large steric hindrance, and is a potential dark blue light emitting polymer. The electroluminescent polymer provided by the invention has good solubility, can be dissolved by adopting a common organic solvent, and can be prepared into a light-emitting layer of a light-emitting diode through spin coating, ink-jet printing or printing film formation.

The invention relates to an amplitude adjustable terahertz near field excitation type molecular sensor and a production method thereof. The molecular sensor is formed by arranging a terahertz photoconductive antenna and an electromagnetic resonant cell array at two sides of a semi-insulated gallium arsenide substrate. The terahertz photoconductive antenna is composed of two T-shaped electrodes which are distributed in mirror symmetry. The horizontal axis part of each T-shaped electrode is an outer electrode. The vertical axis part is an inner electrode. The head ends of the inner electrodes are engaged with the outer electrodes. The electromagnetic resonant cell array is a periodic cross electromagnetic resonant cell array. According to the sensor and the method, the distances between the terahertz photoconductive antenna and the periodic metal resonant cells are reduced to a 3THz wavelength range; the local oscillation strength of dipoles is improved through near field enhancement; the strength of a terahertz electromagnetic resonant mode is improved; the quality factor of the resonant mode is improved; the sensitivity and spatial resolution of THz molecular detection can be improved; and the optical element layout of the whole spectrum detection system is simplified.

The invention belongs to the field of solar cells, and discloses a high-performance environment-friendly lead-based perovskite solar cell and a preparation method thereof. According to the preparationmethod, a certain amount of a chelating agent disodium ethylene diamine tetraacetate or 2, 3-dimercaptosuccinic acid is introduced into a lead-based perovskite precursor solution so that the crystallinity and the crystal orientation of a lead-based perovskite thin film layer can be effectively optimized, the grain boundary of a perovskite thin film is passivated, and the energy conversion efficiency of the perovskite thin film is improved. Meanwhile, when the device is decomposed, the chelating agent can be combined with lead ions in time to form a stable and soluble complex, the complex canbe smoothly metabolized by a human body and discharged along with urine after being absorbed by the human body accidentally, and finally harm to the human body is remarkably reduced. Commercial development of the perovskite solar cell is facilitated, and particularly application of perovskite indoor photovoltaic as energy supply of the smart home terminal in the Internet of Things era is promoted.

The invention provides nano cerium dioxide and a preparation method thereof. The preparation method at least comprises the following steps: adding a first silane coupling agent solution into cerium nitrate to obtain a solution A; adding a second silane coupling agent into a cerium nitrate solution to obtain a solution B with precipitate; and mixing the solution A with the solution B, and reactingunder a sealed system to obtain a product. The method is simple; one-step synthesis is achieved; the annealing treatment is not needed.

The invention discloses a flaring heat pipe. The flaring heat pipe comprises a hollow pipe body, wherein both ends of the hollow pipe body are sealed, and working media are injected into the hollow pipe body; the hollow pipe body comprises a heating section, an insulating section and a cooling section; the inner diameters of the heating section, the insulating section and the cooling section are the same; the outer diameters of the insulating section and the cooling section are consistent, and the outer diameter of the heating section is greater than that of the insulating section and the cooling section; a first capillary structure is arranged on the inner wall of the heating section, and second capillary structures are arranged on the inner walls of the insulating section and the coolingsection; and the thickness of the first capillary structure is greater than that of the second capillary structures. The invention further discloses a manufacturing method of the flaring heat pipe. According to the flaring heat pipe provided by the invention, the thickness of the capillary structure of the heating section is large, so that the backflow circulating speed in a pipe cavity body is increased, and the heat transfer efficiency is greatly improved; a die cutting mode is adopted, a part of the necking position is hollow after being cut, and protective gas can enter the pipe when thetail end is welded, so that the welding position is prevented from being oxidized by high temperature, and annealing is not needed.

The invention belongs to the field of organic optoelectronics and discloses an electroluminescent monomer and polymer and preparation and application methods thereof. The structural formula of the electroluminescent polymer is shown as follows, which introduces a naphthalene nucleus on the structural basis of 10, 12-indane[2, 1-b] fluorene, accordingly, not only can the advantages of the 10, 12-indane[2, 1-b] fluorene which can effectively inhibit production of exciplexes and shortening of conjugated length to lead to movement of luminescent wavelength towards short wavelength and further to facilitate emission of purer blue light be retained, but also, by means of an asymmetric structure, the electroluminescent polymer can facilitate formation of amorphous film to inhibit fluorescence quenching. The electroluminescent polymer is high in dissolving property and applicable to processing solution, reducing device production costs as well as preparing large-area flexible OLED (organic light emitting diode) devices, and saves annealing treatment during production of electroluminescent devices, thereby being simple in production processes and having a huge potential and prospect for development in the field of organic electronic display.

The invention discloses steel for a high-strength aluminum-coated substrate. The steel comprises following chemical elements: by mass, 0.008-0.02% of C, greater than 0 and less than or equal to 0.005%of Si, 0.25-0.5% of Mn, 0.018-0.03% of P, less than or equal to 0.005% of Al, 0.0040-0.010% of N, 0.02-0.04% of Ti, 0.02-0.050% of O, and the balance Fe and other inevitable impurities. In addition,the invention further discloses a manufacturing method of the steel for the high-strength aluminum-coated substrate. The manufacturing method comprises the steps of (1) conducting smelting and casting; (2) conducting reheating, specifically, reheating a casting blank to 1180 DEG C-1250 DEG C; (3) conducting rough rolling; (4) conducting finish rolling; (5) conducting coiling; and (6) cooling the casting blank to the indoor temperature. The steel for the high-strength aluminum-coated substrate is good in mechanical performance, high in strength, excellent in plasticity and quite suitable for generation of aluminum-coated steel.

The invention relates to a method for preparing an A-phase vanadium dioxide film through magnetron sputtering. A vanadium metal target or a vanadium oxide ceramic target serves as the target material,argon serves as sputtering gas and oxygen serves as reaction gas for sputtering the target material so that the A-phase vanadium dioxide film can be formed on a substrate. The cell parameter aA of A-phase vanadium dioxide is 0.844 nm, the cell parameter bA of A-phase vanadium dioxide is 0.844 nm, and the cell parameter cA of A-phase vanadium dioxide is 0.767 nm. Matching of substrate lattice parameters and A-phase vanadium dioxide is the key of the method.

The invention discloses corrosion-inhibiting steel for an aluminum-coated substrate. The corrosion-inhibiting stee comprises the following chemical elements in percentage by mass, C is greater than 0and less than or equal to 0.01%, Si is greater than 0 and less than or equal to 0.005%, 0.08-0.2% of Mn, 0.018-0.03% of P, Al is less than or equal to 0.005%, 0.04-0.1% of Cu, 0.1-0.25% of Cr, 0.0040-0.010% of N, 0.01%-0.035% of Ti, 0.02%-0.050% of O and the balance of Fe and other inevitable impurities. The invention further discloses a manufacturing method of the corrosion-inhibiting steel for the aluminum-coated substrate. The manufacturing method comprises the following steps of (1) smelting and casting; (2) reheating, reheating the casting blank to 1180 DEG C to 1250 DEG C; (3) rough rolling; (4) finish rolling; (5) coiling; and (6) cooling to room temperature. The steel for the aluminum-coated substrate is good in mechanical property, high in strength, good in plasticity and capableof inhibiting corrosion.

The invention relates to continuous hot galvanization equipment for hot rolled strip steel. The continuous hot galvanization equipment comprises an inlet sealing section (1), a heating section (2), asoaking zone (3), a cooling section (4), an outlet section (5) and a zinc pot (9), wherein acid-pickled hot rolled strip steel can pass through the inlet sealing section (1), the heating section (2),the soaking zone (3), the cooling section (4), the outlet section (5) and the zinc pot (9) in sequence; and the heating section (2) is provided with induction heating equipment. The invention also relates to a continuous hot galvanization method for the hot rolled strip steel; the continuous hot galvanization method for the hot rolled strip steel adopts the continuous hot galvanization equipment for the hot rolled strip steel and comprises the following steps: step (S1) making the hot rolled strip steel pass through the heating section (2), wherein the hot rolled strip steel is heated in reducing atmosphere inside the heating section (2) until a thin iron oxide layer on the surface of the hot rolled strip steel is fully reduced; step (S2) making the hot rolled strip steel pass through thesoaking zone (3) and the cooling section; and step (S3) galvanizing the hot rolled strip steel in the zinc pot (9) at a suitable technological temperature suitable for galvanization.

The invention belongs to the field of display devices, and discloses a PEN flexible substrate transparent thin film transistor and a preparation method thereof. The preparation method comprises the following steps: a glass substrate is cleaned and dried; and then a layer of PEN is coated with OCA glue; an AZO grid is prepared on the PEN layer by using radio frequency magnetron sputtering deposition; a Al2O3 grid insulating layer is prepared on the AZO grid by using the radio frequency magnetron sputtering deposition; an IGZO semiconductor layer is deposited on the grid insulating layer by using pulsed direct current magnetron sputtering; a Al2O3 semiconductor modified layer is deposited on the semiconductor layer by using the radio frequency magnetron sputtering; and AZO source and drain electrodes are deposited by using pulse laser so as to obtain a PEN flexible substrate transparent thin film transistor. According to the PEN flexible substrate transparent thin film transistor and thepreparation method in the present invention, the AZO is adopted as a grid electrode and source and drain electrodes of the TFT device, and the obtained TFT device has the advantages of high performance, high transparency, and non-toxicity.

The invention discloses a copper-doped yttrium aluminate crystal for thermoluminescence and photoluminescence and a preparation method thereof. The copper-doped yttrium aluminate crystal has a chemical formula of Y(1-x):AlO3:Cux, wherein x=0.001-0.1, x is a molar ratio of doped ions Cu<2+> to atoms Y. The copper-doped yttrium aluminate crystal grows by adopting a melt blending method can realize the thermoluminescence or the photoluminescence after absorbing radiant energy of high-energy rays, has favorable dose linear response and is a luminescence material with better performance for a radiation dosemeter.

The invention discloses a CuCo-BDC ultrathin nanosheet, a preparation method and application thereof. The preparation method comprises the following steps: dissolving copper chloride dihydrate, cobalt chloride hexahydrate and terephthalic acid in a mixed solution of N, N-dimethylformamide, ethanol and deionized water in an ultrasonic manner; and stirring the solution obtained in the previous step, adding triethylamine in a stirring state, then putting the solution into an ultrasonic machine for ultrasonic treatment, then centrifuging, cleaning the product obtained after centrifuging with ethanol multiple times, and drying to obtain Cu / Co-BDC powder, namely the CuCo-BDC ultrathin nanosheet. According to the invention, the Cu / Co-BDC ultrathin nanosheet with the optimal performance is obtained by regulating and controlling the proportion of metal elements, and then the Cu / Co-BDC ultrathin nanosheet is directly used as a lithium ion battery negative electrode material, wherein the average discharge potential of the material is improved by doping Cu<2+> ions, the Cu<2+> ions and Co<2+> form a bimetal organic framework, and the electrochemical lithium storage performance of the material is further improved through the coordination effect of bimetal ions.