45 results about "Titanium-niobium alloy" patented technology

This invention provides a high-strength, high-ductility austenitic stainless steel and its production method. The composition is: C 0.045%-0.085%, N 0.10%-0.40%, Si 0.90%-1.55%, Cr 16%-20.1%, Ni 7.5%-12.5%, Mn 1.5%-3.5%, Mo 1.5%-3.0%, Nb 0.08%-0.22%, Ti 0.015-0.065%, O≤0.005%, P≤0.003%, S≤0.003%, with the remainder being Fe and unavoidable impurities. Compared with existing technologies, this invention obtains a reasonable grain size and second-phase particles through nitrogen, titanium, and niobium alloying, combined with low-temperature rolling and appropriate annealing and aging heat treatment, thus developing an austenitic stainless steel with excellent mechanical properties. It achieves excellent ductility at a high strength level, with a strength-ductility product as high as 60 GPa·s.

The invention discloses a preparation method of a Ni3Sn superconducting wire based on 3D printing. The preparation method comprises the following steps: depositing a reticular niobium film on the surface of a tin-titanium alloy rod through 3D printing to obtain a tin-titanium-niobium alloy rod; drilling a hole in the center of the tin-titanium-niobium alloy rod, and inserting a tin-silver alloy rod to obtain the tin-titanium-niobium-silver alloy rod; the tin-titanium-niobium-silver alloy bar is put into the Ni3Sn-copper-niobium composite tube, and then an internal tin method Ni3Sn sub-component is obtained; sequentially putting the internal tin method Ni3Sn subcomponents into the tantalum tube and the oxygen-free copper tube to obtain an internal tin method Ni3Sn blank; and stretching the inner tin method Ni3Sn blank to obtain the Ni3Sn superconducting wire. Due to the existence of the silver element, uniform diffusion of the tin element in the heat treatment process is facilitated, the netted niobium film is deposited on the surface of the tin-titanium alloy rod through 3D printing, the precision and quality of the niobium film are guaranteed, more high-quality Ni3Sn crystal grains can be generated in the heat treatment process of the wire, and the performance of the Ni3Sn wire prepared through the internal tin method is improved.

To provide a niobium titanium-based oxide that can achieve secondary batteries with high capacity and excellent rate characteristics.SOLUTION: According to one embodiment, a niobium titanium-based oxide is provided. The niobium titanium-based oxide satisfies formulae (1) to (3) in an L*a*b* color space as measured in accordance with Japanese Industrial Standards JIS Z8722: 2009: 95.0≤L*≤100 (1), -1.0≤a*≤1.0 (2) and -1.0≤b*≤6.0 (3).SELECTED DRAWING: Figure 1

The invention discloses a method for preparing a bulk phase-surface layer gradient doped niobium titanium oxygen negative electrode material by adopting a fused salt electrochemical method and application, and belongs to the field of negative electrode material preparation. The method comprises the following specific steps: preparing a niobium-titanium-oxygen sheet as a cathode; the method comprises the following steps: by taking a LiCl-KCl eutectic mixture as basic fused salt, sequentially adding a first group of dopants and a second group of dopants; in an inert atmosphere, electrolysis is firstly carried out at a relatively low voltage to reduce the first group of elements and diffuse to a bulk phase; electrolysis is carried out under high voltage, so that the second group of elements are reduced and enriched on the surface layer; and washing, drying and grinding the product to obtain the negative electrode material with component and functional gradients from a bulk phase to a surface layer. A continuous gradient structure with a bulk phase rich in high-conductivity elements and a surface layer rich in fast ion elements is constructed in a single particle. According to the structure, the intrinsic electron conductivity, the bulk phase ion diffusion rate and the interface ion migration kinetics of the material are synergistically improved, and the low-temperature fast charging performance, the rate capability and the cycling stability of the material serving as the negative electrode of the lithium ion battery are remarkably enhanced.

The invention discloses a method for constructing a gradient sulfide niobium-titanium-oxygen negative electrode material through two-step hydrothermal and application of the gradient sulfide niobium-titanium-oxygen negative electrode material, according to the method, a conventional niobium-titanium-oxygen material precursor is prepared through a hydrothermal method, then a sulfur source K2S is added for secondary hydrothermal treatment, and finally the gradient sulfide niobium-titanium-oxygen material is obtained through high-temperature annealing. According to the preparation method, the gradient sulfide niobium-titanium-oxygen hybrid capacitor negative electrode material is prepared through a two-step hydrothermal method, the concentration and duration of hydrothermal vulcanization are finely controlled, sulfur atoms replace part of oxygen atoms to different degrees, the electron transfer rate and the lithium ion de-intercalation rate of the niobium-titanium-oxygen material are increased, and the rate performance is greatly improved. The gradient sulfide niobium-titanium-oxygen hybrid capacitor negative electrode material prepared by the method can be used in the field of high-power and high-specific-energy niobium-titanium-oxygen-based lithium ion hybrid capacitors.

The application discloses a titanium-niobium alloy double-gradient material and a preparation method thereof, and belongs to the field of gradient material preparation. The application utilizes an electron beam additive manufacturing technology, controls the temperature of a powder bed, controls the precipitation quantity and distribution of an alpha" phase from a beta phase, forms double-gradient changes of the volume fraction and the elastic modulus of the precipitated phase along a preset direction, and finally successfully prepares the titanium-niobium alloy double-gradient material. The method is highly controllable, the combined action of the precipitation phase gradient and the elastic modulus gradient in the prepared double-gradient material significantly improves the impact resistance of the additive manufactured titanium alloy material, and the production is simple, the production cost is low, the efficiency is high, and the method has high further research and application values.

The present invention relates to the field of niobium alloy heat treatment technology, and proposes a method and system for heat treatment of high temperature alloy parts, including: 2 , niobium pentoxide as raw materials are transferred to a ball mill for mixing and ball milling to obtain a mixed material; the mixed material is transferred to a smelting furnace for smelting and cooling to obtain a high niobium titanium aluminum alloy ingot; the high niobium titanium aluminum alloy ingot is subjected to hot forging to obtain a high niobium titanium aluminum alloy billet, and then hot rolled to obtain a high niobium titanium aluminum alloy thick plate; the high niobium titanium aluminum alloy thick plate is subjected to solid solution and quenching treatment to obtain a high temperature resistant high niobium titanium aluminum alloy thick plate; the solid solution temperature during solid solution treatment is adjusted in real time according to the quality analysis of the high temperature resistant high niobium titanium aluminum alloy thick plate; the high temperature resistant high niobium titanium aluminum alloy thick plate is subjected to cold rolling and laser welding to obtain a niobium alloy component. The present application improves the preparation quality of niobium alloy components by real-time regulation of the solid solution temperature during solid solution treatment.

The invention discloses a filling wire for double-wire electric arc additive manufacturing of TaNbTiZrY refractory high-entropy alloy and a process method, and belongs to the technical field of additive manufacturing. The TaNbTiZrY refractory high-entropy alloy is manufactured through electric arc additive manufacturing of the cable type filling wire and the solid filling wire. The cable type filling wire is formed by twisting seven filling wires with the diameter of 0.6 mm, wherein the seven filling wires comprise three Nb wires, three Ti-Y alloy wires and one pure Zr wire, and the Ti-Y alloy wires comprise 97.5-99.5 wt.% of Ti, 0.5-2.5 wt.% of Y and one pure Zr wire. A pure Zr wire is used as a central wire, other six filling wires with the same components are arranged at intervals in a crossed mode on the periphery, the twisting speed is 4 m / s, and the lay length is set to be 10 mm. And the solid filling wire is a pure Ta wire with the diameter of 1.2 mm. The TA1 is used as a substrate, and high-efficiency, high-quality and low-cost preparation of the TaNbTiZrY refractory high-entropy alloy can be achieved by controlling parameters such as the wire feeding speed, the welding current and the interlayer cooling time.

The application relates to a preparation method of a niobium titanium oxide / liquid metal composite negative electrode material and application of the niobium titanium oxide / liquid metal composite negative electrode material in a low-temperature lithium ion battery, and belongs to the field of secondary batteries. The method is as follows: TiNb2O7 microspheres are synthesized, SnO2 is deposited on the surface of the TiNb2O7 by adopting an atomic layer deposition technology and taking SnCl4 and H2O as precursors, and TNO@Sn material is obtained through hydrogen reduction; TNO@Sn powder, Super P and PVDF are uniformly mixed in a solvent to prepare a slurry, the slurry is coated on a copper foil current collector, and an electrode sheet is obtained through rolling; Ga-In-Sn ternary eutectic liquid metal is prepared, the liquid metal is uniformly sprayed on the surface of the electrode sheet in an Ar atmosphere glove box, the Ga-In-Sn liquid metal / TiNb2O7 composite negative electrode is prepared in a "cold welding" mode, the interface bonding force between the liquid metal and the active particles is enhanced through an alloying reaction, the composite process temperature is reduced, and the damage of high temperature to the material is avoided. Meanwhile, the flowability, self-healing and high conductivity of the liquid metal compensate for and enhance the ion / electron transmission deficiency of the TiNb2O7 composite electrode at low temperature, and high safety is ensured.

To provide a niobium-titanium alloy having high plasticity.SOLUTION: The niobium-titanium alloys for superconducting applications in accordance with the standard specifications of ASTMB884 11 are characterized in that the measured values of the niobium-titanium alloys satisfy all the following conditions (1), (2) and (3): (1) Tensilestrength: 350MPa or less (2) Yieldstrength: 350MPa or less (3) Elongation (Relativeelongationatbase25mm): 21% or more SELECTED DRAWING: Figure 1

The invention discloses a preparation method of fluorinated niobium-titanium-oxygen hollow spheres and application of the fluorinated niobium-titanium-oxygen hollow spheres in a lithium ion battery, and belongs to the field of lithium ion batteries. The method comprises the following steps: preparing silicon dioxide microspheres, and preparing niobium-titanium-oxygen hollow spheres by taking the prepared silicon dioxide microspheres as a template. The niobium titanium oxide material (SiO2 (at) TiNb2O7) loaded on the microspherical titanium dioxide is prepared by a solvothermal method. And then, dissolving SiO2 and TiNb2O7 in a hydrofluoric acid (30wt%) solution, and transferring the solution into a reaction kettle to prepare the fluorinated niobium-titanium-oxygen hollow sphere material. According to the preparation method, fluorination of niobium-titanium-oxygen and preparation of the hollow sphere are achieved through a one-step method, the specific surface area is increased through the hollow sphere structure, larger real current density can be borne, rapid deintercalation of lithium ions is facilitated, the electronic conductivity of the niobium-titanium-oxygen material is improved through fluorination, the rate performance is greatly improved, and the service life of the niobium-titanium-oxygen material is prolonged. And the surface of the electrode can be passivated through fluorination, the generation of interface side reaction is inhibited, the gas production behavior is further inhibited, and the preparation method can be applied to the field of high-power niobium-titanium-oxygen-based lithium ion batteries.

To provide an active material, an electrode material, and an electrode capable of achieving a secondary battery excellent in rate performance, a secondary battery and a battery pack excellent in rate performance, and a recycling method of an electrode capable of improving a recycling rate of the electrode.SOLUTION: According to one embodiment, an active material including oxide particles containing a monoclinic niobium titanium oxide phase is provided. The X-ray diffraction spectrum includes a maximum peak P1 appearing in a range of 23.6 ° or more and 24.3 ° or less and a plurality of peaks appearing in a range of 25.8 ° or more and 26.6 ° or less. I2 / I4 is 5 or more and 26 or less when the peak intensities of three peaks having the largest peak intensity among the peaks appearing in the range of 25.8 ° or more and 26.6 ° or less are respectively I2, I3, and I4 in descending order.SELECTED DRAWING: Figure 1

The utility model discloses a cable joint manufacturing tool, and belongs to the technical field of superconducting magnets. The cable connector manufacturing tool comprises a fixing assembly which comprises a fixing clamp with a clamping space; the copper piece is provided with a first limiting groove and a second limiting groove in a concave mode, the first limiting groove is used for containing a first cable, the second limiting groove is used for containing a second cable, and the copper piece, the second cable and the first cable are sequentially attached through the fixing clamp; and the fixing assembly is arranged on the heating module and is used for welding the first cable and the second cable. According to the utility model, the Ni3Sn superconducting wire and the Niobium-TiRutherford cable can be welded, and the good ductility of the Niobium-TiRutherford cable is utilized, so that the wound magnet can be smoothly routed at the wire inlet and outlet joint.

The present invention discloses a preparation and application of a niobium-titanium two-dimensional transition metal carbide, belonging to the technical field of two-dimensional materials. The present invention prepares (Nb 1‑y Ti y )4AlC3MAX phase solid solution, which was then crushed, etched and intercalated to obtain niobium-titanium two-dimensional transition metal carbide (Nb 1‑y Ti y )4C3T x , where 0 <y≤0.4,T x As the surface end group, the obtained niobium-titanium two-dimensional transition metal carbide has excellent rate performance.

The application provides a preparation method of a high-niobium-content titanium-niobium alloy ingot, comprising the following steps: A) mixing and pressing niobium strips and titanium sponge particles after weighing according to a specific arrangement mode to obtain electrode blocks; B) assembling and welding a plurality of electrode blocks prepared in step A) to obtain consumable electrode rods; C) twice melting the consumable electrode rods to obtain secondary ingots; D) forging the secondary ingots to obtain titanium-niobium billets; and E) twice melting the titanium-niobium billets after peeling and brightening to obtain titanium-niobium alloy ingots. The titanium-niobium alloy ingot prepared by the application is completely beta phase at room temperature, the content of niobium element in the ingot is 47.0-53.0 wt%, the chemical composition of the ingot is uniformly and stably distributed with small fluctuation, the chemical composition deviation is less than or equal to 0.15%, and the ingot is free of defects such as inclusions, segregation and titanium-rich spots, thereby meeting the demand of industrial production for high-quality beta-type titanium-niobium alloy ingots with high niobium content.

The present invention belongs to the technical field of superconducting wires, and relates to a method for preparing a short-period niobium-titanium superconducting wire and a niobium-titanium superconducting wire. The preparation method comprises: performing a first online heat treatment while stretching a NbTi / Nb / Cu primary single core rod, and immediately performing a first water cooling after the heat treatment to obtain a NbTi / Nb / Cu single core rod; placing the NbTi / Nb / Cu single core rod into a copper tube, filling the gap with a copper plug rod to form a NbTi / Cu composite ingot, and extruding the NbTi / Cu composite ingot to obtain a NbTi / Cu composite rod; performing a second online heat treatment while stretching the NbTi / Cu composite rod, and immediately performing a second water cooling after the heat treatment to obtain a NbTi / Cu composite wire; twisting and stretching the NbTi / Cu composite wire to obtain a niobium-titanium superconducting wire. The present invention solves the technical problem of a long preparation cycle of niobium-titanium superconducting wires.

The invention discloses a preparation method and application of a tantalum-niobium-magnesium-cerium-lanthanum high-entropy alloy / niobium-titanium-oxygen two-phase heterogeneous material, and belongs to the field of secondary batteries, and the preparation method comprises the following specific steps: preparing a compacted titanium niobate electrode by adopting a traditional high-temperature solid-phase method and a tabletting sintering method; the tantalum-niobium-magnesium-cerium-lanthanum high-entropy alloy / niobium-titanium-oxygen two-phase heterogeneous material is prepared by electrolyzing graphite serving as an anode, a tabletting niobium-titanium-oxygen material serving as a cathode and chloride molten salt serving as electrolyte in a tubular furnace. The tantalum-niobium-magnesium-cerium-lanthanum high-entropy alloy / niobium-titanium-oxygen two-phase heterogeneous material is prepared for the first time, the introduced metal alloy can improve the body electron conductivity of the niobium-titanium-oxygen material, and energy band structure rearrangement and electron delocalization at the two-phase interface enhance the adsorption performance of the material surface to solvated lithium, improve the surface / near-surface charge exchange reaction and improve the performance of the material surface to the solvated lithium. The diffusion barrier at a lithium ion interface is reduced, and the first coulombic efficiency and the low-temperature cycling stability of the composite niobium-titanium-oxygen material as a lithium ion battery negative electrode material are greatly improved.

The invention discloses a formation method of a niobium titanium oxide lithium ion battery, which is used for carrying out gradient formation on the lithium ion battery at the formation temperature of 50-70 DEG C and under the formation pressure of 0.4-0.8 Mpa, and specifically comprises the following steps: S1, at the first stage, carrying out constant-current charging, aging and discharging on the lithium ion battery according to a first parameter; s2, at a second stage, carrying out constant-current charging, aging and discharging on the lithium ion battery according to a second parameter; and S3, in the third stage, constant current is 0.2-0.5 C, constant voltage charging is carried out to 3.2 V, and cut-off current is 0.05 C. Through the gradient low-current full-full discharge and high-temperature pressurization aging combined method, the compactness of a niobium-titanium-oxygen lithium ion battery negative electrode film can be improved, gas production of a niobium-titanium-oxygen negative electrode is inhibited, gas expansion in the battery circulation / storage process is reduced, and the battery cycle performance is improved.

The invention provides a method for binding a titanium-niobium alloy target material and a back plate. The binding method comprises the following steps: sequentially carrying out sand blasting and nickel plating on a welding surface of the titanium-niobium alloy target material; the titanium-niobium alloy target material and the back plate are independently subjected to two-stage heating, and then the titanium-niobium alloy target material and the back plate are infiltrated through welding flux; and a welding flux groove is formed in the welding face of the back plate, a copper wire is placed in the welding flux groove, the titanium-niobium alloy target and the welding face of the back plate are attached and pressed, and welding is completed. According to the binding method, welding binding of the titanium-niobium alloy target material and the back plate is achieved, the welding binding rate of the target material and the back plate reaches 99.2% or above, the welding strength reaches 4.7 MPa or above, it is ensured that the target material and the back plate are firmly bound in the sputtering use process, and unsoldering does not occur.

The present invention belongs to the field of additive manufacturing technology and relates to an equiaxed crystal high-homogeneity titanium-niobium alloy and an arc twin-wire additive manufacturing method thereof. The method installs and fixes pretreated pure titanium wire, pure niobium wire, and a substrate, inputs specific process parameters into the control system of the arc twin-wire additive manufacturing equipment, and performs arc twin-wire deposition through a specific scanning mode to obtain an equiaxed crystal high-homogeneity titanium-niobium alloy. The present invention solves the problem of high niobium inclusions, can promote the uniformity of the composition of the titanium-niobium alloy, facilitates the rapid preparation of the equiaxed crystal high-homogeneity titanium-niobium alloy, is beneficial to the subsequent plastic deformation of the equiaxed crystal high-homogeneity titanium-niobium alloy, can meet the stable production of equiaxed crystal high-homogeneity titanium-niobium alloy products, and ensures the stability of the performance of the components during service.

The invention relates to a layer system (1) for coating a metal substrate (2a) to form a flow field plate (2), comprising:-at least one cover layer (1a) made of a metal oxide; -at least one intermediate layer (1b) supporting the cover layer (1a); and-a lower layer (1c) supporting the intermediate layer (s) (1b); wherein the cover layer (1a) is formed of an indium tin oxide; wherein the indium tin oxide is doped with at least one element from the group including carbon, nitrogen, boron, fluorine, hydrogen, silicon, titanium, tin, and zirconium; wherein the at least one intermediate layer (1b) is formed from titanium nitride and / or titanium carbide and / or titanium carbonitride and / or titanium niobium nitride and / or titanium niobium carbide and / or titanium niobium carbonitride and / or chromium nitride and / or chromium carbide and / or chromium carbonitride; and wherein the lower layer (1c) is formed of titanium or a titanium-niobium alloy or chromium. The invention also relates to a flow field plate having a layer system (1) of this type, and to a fuel cell (10), an electrolytic cell or a redox flow battery having a flow field plate (2, 2 ') of this type.

The present invention provides a method for manufacturing a secondary battery capable of obtaining a secondary battery with high output performance and little gas generation even after repeated charge-discharge cycles, and a low-resistance secondary battery with high output performance and little gas generation even after repeated charge-discharge cycles. According to an embodiment, there is provided a method for manufacturing a secondary battery, which includes the following steps: a step of preparing a battery structure including a positive electrode, a negative electrode, and an electrolyte; a step of obtaining a processed potential adjustment state by adjusting the positive electrode potential of the positive electrode to be in the range of 3.4 V to 3.9 V based on the redox potential of lithium and adjusting the negative electrode potential of the negative electrode to be in the range of 1.5 V to 2.0 V based on the redox potential of lithium; and a step of maintaining the battery structure in the processed potential adjustment state at a holding temperature in the range of 50°C to 90°C. The positive electrode contains a lithium nickel cobalt manganese composite oxide. The negative electrode contains a niobium titanium composite oxide. The electrolyte contains one or more first organic solvents having a viscosity of 1 cP or less.

The invention discloses a titanium-niobium alloy tube target material and a preparation method thereof, and relates to the technical field of refractory alloy powder metallurgy target material preparation, and the preparation method comprises the steps that titanium metal powder and niobium metal powder are mixed according to a preset mass ratio to obtain titanium-niobium mixed powder; the titanium-niobium mixed powder is loaded into a sheath mold, then welding is conducted on an end cover of the sheath mold, and a gas guide hole is reserved; carrying out heat treatment and vacuum degassing on the sheath mold, and then carrying out stepped heating hot isostatic pressing treatment on the sheath mold to obtain a pressed sheath; and machining the pressed sheath, and removing the inner sheath and the outer sheath to obtain the titanium-niobium alloy tube target material. The technical problems that in the prior art, steps are tedious, and the utilization rate is low are solved.

The application relates to a preparation method of fluorinated niobium-titanium oxygen hollow spheres and application of the fluorinated niobium-titanium oxygen hollow spheres in lithium ion batteries. The method comprises the following steps: preparing silica microspheres, preparing niobium-titanium oxygen hollow spheres by taking the prepared silica microspheres as templates. A niobium-titanium oxygen material (SiO2@TiNb2O7) loaded on microspherical titanium dioxide is prepared by a solvothermal method. Then, the SiO2@TiNb2O7 is dissolved in a hydrofluoric acid (30 wt%) solution, and is transferred into a reaction kettle to obtain fluorinated niobium-titanium oxygen hollow sphere materials. The preparation method realizes the fluorination of niobium-titanium oxygen and the preparation of hollow spheres by a one-step method. The hollow sphere structure improves the specific surface area, can bear a larger real current density, is favorable for the fast deintercalation of lithium ions, the fluorination improves the electronic conductivity of the niobium-titanium oxygen material, greatly improves the rate performance, and the fluorination can passivate the electrode surface, inhibit the occurrence of interface side reactions, and further inhibit the gas production behavior. The preparation method can be used in the field of high-power niobium-titanium oxygen-based lithium ion batteries.

The invention relates to the technical field of metal rolling machining, in particular to a preparation method of a rolled titanium alloy. Titanium, aluminum, vanadium and a titanium-niobium alloy are smelted to obtain an alloy ingot, the alloy ingot is subjected to heat preservation and heating, and then the rolled titanium alloy is obtained in a hot rolling mode. The rolled titanium alloy obtained through the method is refined in grain and uniform in structure, and the strength, hardness and plasticity of the titanium alloy are remarkably improved. The method also improves the surface quality and the overall reliability of the titanium alloy, and is suitable for application scenes with high strength and high requirements of the titanium alloy.

A display panel and a method for manufacturing the display panel are provided, wherein the display panel includes: a substrate layer; a signal line, which is arranged on the substrate layer, and the signal line includes: a first layer, which includes aluminum; and a second layer, which is directly arranged on the first layer, and the second layer includes a niobium-titanium alloy; a first thin-film transistor, which is connected to the signal line; a second thin-film transistor, which is arranged on the substrate layer; a capacitor, which is electrically connected to the second thin-film transistor; and a light-emitting element, which is electrically connected to the second thin-film transistor.

The present invention discloses a high-safety niobium-titanium oxide soft-pack battery cell and a preparation method thereof. The battery cell comprises a positive electrode, a negative electrode, a separator and an electrolyte. The positive electrode comprises an aluminum foil and a positive electrode slurry, and the positive electrode slurry comprises lithium nickel cobalt manganese oxide, CNT, SP and PVDF; the negative electrode comprises a carbon-coated aluminum foil and a negative electrode slurry, and the negative electrode slurry comprises niobium-titanium oxide, CNT, graphene, CMC, PAA and an amino alcohol dispersant; the electrolyte comprises a lithium salt, a solvent and a functional additive. This solution adopts SP, graphene and CNT conductive agent to construct a complete conductive network, greatly reduce the internal impedance of the battery cell, and enable the battery cell to work normally at ‑40°C. The battery cell system not only has high safety characteristics, but also has low temperature resistance characteristics.

The invention provides a negative electrode based on niobium-titanium-oxygen primary particles and a lithium battery, the negative electrode comprises a negative electrode current collector and a negative electrode active material layer located on the negative electrode current collector, the negative electrode active material layer comprises a negative electrode active material, a conductive agent and a binder, the negative electrode active material comprises graphite and niobium-titanium-oxygen, and the conductive agent comprises a conductive agent and a binder. The niobium-titanium-oxygen is primary particles, and the niobium-titanium-oxygen primary particles can be filled into gaps of graphite or a mixture of graphite and silicon carbon, so that the compaction density of the negative electrode plate is improved, and the cohesiveness of the negative electrode plate is enhanced, thereby reducing the use amount of a binder, improving the multiplying power and low-temperature performance of a battery cell, and obviously improving the safety performance, especially the needling safety, of the battery cell.

This invention discloses a method for controlling the lamellar orientation of high-niobium titanium-aluminum alloys. The method involves coating the surface of the high-niobium titanium-aluminum alloy with boron nitride glass lubricant; wrapping the high-niobium titanium-aluminum alloy with pure nickel foil and encapsulating it in a metal sleeve; heating the high-niobium titanium-aluminum alloy extrusion billet assembly to the (α+β) two-phase region and holding it at that temperature; rolling-coating with boron nitride glass lubricant and then extruding and air-cooling to room temperature; reheating to the β single-phase region and holding it at that temperature; after holding at that temperature, slow cooling to the α single-phase region and holding it at that temperature; and finally, air-cooling to room temperature. This method significantly reduces the dependence on equipment, thereby greatly shortening the time required to control the lamellar orientation. This method can produce 5-8 high-niobium TiAl parts at a time, reducing the preparation time to 1 / 5 to 1 / 8. The method proposed in this invention not only fully utilizes the excellent hot working properties of high-niobium TiAl alloys but is also suitable for controlling the lamellar orientation of high-niobium TiAl alloys as wrought alloys.