51results about "Electrode melt handling" patented technology

The invention provides a fast-charging type solid-state lithium battery alloy negative electrode material, a preparation method and a solid-state lithium battery, and relates to the technical field of lithium batteries. The alloy negative electrode material comprises the following element components in percentage by mass: 30-38% of indium In, 30-35% of tin Sn, 28-35% of bismuth Bi and 0-1.5% of doping elements, crystal phases formed by the alloy negative electrode material of the fast-charging type solid-state lithium battery at least comprise two crystal phases, namely InSn4 and InBi. The alloy negative electrode material has relatively high surface capacity, lithium ion conductivity and lithium ion diffusion coefficient, lithium dendrites do not grow on a negative electrode when a solid-state lithium battery assembled by the alloy negative electrode material is charged and discharged under high current density, and the battery is high in energy density and long in cycle life.

The embodiment of the invention provides a silicon-based negative electrode material and a preparation method thereof, a negative electrode plate and an all-solid-state battery. The silicon-based negative electrode material comprises spherical porous silicon and metal indium, and the metal indium completely fills pores of the spherical porous silicon and coats the surface of the spherical porous silicon to form a continuous coating layer. The technical problems that the internal structure of the battery is damaged and the interface contact fails due to serious volume expansion or shrinkage of the silicon-based negative electrode material in the charging and discharging process, so that the cycle performance of the all-solid-state battery is poor, and the interface contact can be maintained by high voltage are solved.

The invention relates to a method for producing a pre-product for a battery cell, to a method for producing a battery cell, to a method for producing a battery, and to a battery cell. In a method for producing a pre-product (1) for a battery cell (2), Li and Na are mechanically mixed with one another in the solid state. In this way, a three-dimensional lattice structure can be produced which allows particularly low impedance and thus particularly good electrical transfer.

The application discloses a kind of cobalt-cobalt disulfide heterojunction embedded nitrogen-sulfur co-doped carbon nanocage positive electrode material preparation and application in lithium-sulfur battery, belong to lithium-sulfur battery positive electrode sulfur host preparation field;Among them, lithium-sulfur battery positive electrode material includes Co / CoS2@NSC nanocage and sublimed sulfur;Lithium-sulfur battery is assembled to lithium-sulfur battery positive electrode material using the application, and the electrochemical performance of each aspect is significantly improved, and the preparation process of the lithium-sulfur battery positive electrode material is simple, and battery assembling process is simple, and cost can be reduced.

This invention provides a composite lithium metal anode structure, its preparation method, and its application. The composite lithium metal anode structure is sheet-like, comprising interconnected photocurable regions and composite lithium metal regions. The photocurable regions are made of a lithiophilic framework material and a photocurable material; the composite lithium metal regions are made of a lithiophilic framework material and lithium metal. The composite lithium metal anode structure provided by this invention effectively suppresses lithium dendrite growth, improves battery cycle stability, enhances battery safety, and reduces manufacturing costs, thus facilitating large-scale application.

The invention provides a process for producing an anode for a lithium battery. The process comprises providing a current collector, depositing a layer of protective material on a surface of the current collector, depositing a layer of a lithiophilic material on a surface of the protected current collector, and depositing a layer of lithium material in molten form on the layer of lithiophilic material, the lithiophilic material thus reacting with the molten lithium material to form a layer of active anode material. The current collector and / or at least one other layer of the anode may comprise a continuous 3D structure. The protective material deposited on the current collector forms a barrier between the current collector and the lithium in the active anode material, the formation of cracks in the current collector thus being avoided.

The invention belongs to the field of battery materials, and particularly relates to an alkali metal battery and a double-gradient 3D carbon current collector, an alkali metal negative electrode, a preparation method and application thereof, the double-gradient 3D carbon current collector comprises a conductive substrate, a first carbon layer compounded on the conductive substrate, and a second carbon layer compounded on the surface of the first carbon layer, the material in the first carbon layer is microporous carbon a in which metal M sulfide is dispersed and distributed; the material in the second carbon layer is a carbon material b with a graded through hole structure, graded through holes comprise mesopores, macropores and super-macropores, and through hole structures exist among the holes. According to the double-gradient 3D carbon current collector prepared by the preparation method disclosed by the invention, the surface layer of the double-gradient 3D carbon current collector is provided with a continuous through macroporous / super-macroporous structure, so that an expressway is provided for electrolyte infiltration and ion transmission, and a battery has excellent high-rate performance. Under high current density, ions can be rapidly supplemented into the electrode, and dramatic polarization increase and rapid growth of dendritic crystals caused by ion deficiency are avoided.

The present application relates to the technical field of battery, and particularly relates to a high-entropy lithium alloy material, a preparation method, a negative electrode material and a battery. The preparation method provided by the present application grinds metal raw materials of lithium, aluminum, magnesium, tin and zinc into mixed powder; provides a lithium compensation agent, heats the mixed powder to a melting temperature under a protective gas atmosphere, and then adds the lithium compensation agent to form a melt, cools the melt based on a rapid quenching process to obtain a porous composite structure thin strip; places the cooled porous composite structure thin strip in an oxygen-containing gas atmosphere, and the zinc atoms, magnesium atoms and aluminum atoms on the surface of the porous composite structure thin strip respectively react with oxygen and form a passivation layer on the surface of the porous composite structure thin strip; performs fluorination treatment on the side of the passivation layer away from the porous composite structure thin strip to form a protective layer; and performs annealing treatment on the porous composite structure thin strip after the fluorination treatment to obtain a high-entropy lithium alloy material. The problem of insufficient volume expansion inhibition of the high-entropy lithium alloy structure as a negative electrode material is solved.

The application relates to a preparation method and application of a single-crystal metal zinc negative electrode. A polycrystal metal zinc foil with a purity of 98 wt% or more is subjected to melting recrystallization under vacuum or in an inert atmosphere and arranged between two pieces of inert heat-conducting materials to obtain a Zn(002) single-crystal zinc foil with the most densely packed surface. The prepared metal zinc negative electrode has strong corrosion resistance in an electrolyte, high deposition / dissolution reversibility, obviously inhibited side reactions on an electrolyte / negative electrode interface compared with polycrystal or other single-crystal surfaces, can effectively relieve the formation of corrosion bubbles and passivation layers on the negative electrode surface, and improves the cycle stability; meanwhile, the single-crystal zinc plays a role of an epitaxial template within a certain deposition capacity range, guides the conformal deposition behavior of zinc, realizes dendrite-free growth, and prolongs the cycle life of a battery.

An electrochemical cell includes a casing that: includes a lower first element in the form of a vessel, the internal surface of which is at least partially covered by a layer of conductive material so as to form the current collector of the first electrode with a first polarity; includes an upper second element in the form of a cover for closing the vessel; houses a three-dimensional electrode structure with a first electric polarity; houses a three-dimensional electrode structure with a second electric polarity opposite to the first electric polarity; and contains an electrolyte as an ionic conductive medium. The three-dimensional electrode structure with the second electric polarity includes a series of electrodes with a second polarity, each of which is an elongated body with a vertical orientation.

A negative electrode active material includes a silicon-based active material having a crystal grain size of about 300 nm or less. The silicon-based active material has a value of about 2.00 or less as defined by Equation 1 below. The silicon-based active material includes SiOx (x=0) and at least one selected from SiOx (0<x<2), and includes about 70 parts by weight or more of the SiOx (x=0) based on 100 parts by weight of the silicon-based active material. D90−D10 / D50 In Equation 1, D90, D10, and D50 represent diameters of particles corresponding to 90%, 10%, and 50% by volume in a size distribution, respectively.

The invention relates to a preparation method of an elastic eutectic alloy negative electrode, the elastic eutectic alloy negative electrode is prepared by compounding lithium metal and an elastic eutectic alloy, the elastic eutectic alloy is prepared from a component I and a component II, the component I is one or two of metal Mg, Al, Zn, Ga, Ag, In, Sn, Sb and Bi and nonmetal Si, the component II is one or two of metal Ca, Ti, Cr, Mn, Fe, Ni, Cu, Ge, Zr, Nb, Mo and Au, and the component II is one or two of metal Ca, Ti, Cr, Mn, Fe, Ni, Cu, Ge, Zr, Nb, Mo and Au. The types of metals in the components of the elastic eutectic alloy are not more than three. The invention also relates to the elastic eutectic alloy negative electrode prepared by the preparation method and application of the elastic eutectic alloy negative electrode in a bipolar solid-state battery. The elastic eutectic alloy negative electrode can effectively reduce the nucleation potential barrier of lithium metal, induce uniform deposition of lithium and buffer mechanical contact stress, so that volume expansion in the charging and discharging process is relieved, and assembly layering induced by pulverization and volume fluctuation is inhibited.

The invention provides a hypoeutectic alloy negative electrode material, a preparation method and application of the hypoeutectic alloy negative electrode material in a solid-state lithium battery, and relates to the technical field of solid-state lithium batteries. The hypoeutectic alloy negative electrode material comprises tin and bismuth elements, wherein the mass ratio of the tin to the bismuth is (60-70): (30-40); wherein in the hypoeutectic alloy negative electrode material, tin and bismuth are respectively staggered with each other in a 100-500nm wire-rod-shaped structure, and meanwhile, a part of bismuth is distributed in a tin matrix in a solid solution form. The alloy negative electrode has ultrahigh lithium ion conductivity and lithium ion diffusion coefficient, can be used for preparing a solid-state lithium battery, can perform charge-discharge cycle under low N / P ratio and ultrahigh current density, does not have lithium dendrite growth, ensures that the solid-state battery shows high safety, high energy density, high rate performance and ultra-long cycle stability at the same time, and has a wide application prospect. And the defects in the prior art are overcome.

A method includes providing a current collector including a metal, and forming a lithium layer on at least one side of the current collector. This includes immersing the current collector in a bath of molten lithium, and controlling the thickness of the lithium layer at least in part by at least one of setting a linear velocity through the bath or a residence time of the current collector within the bath. Subsequently, the method provides a current collector having a lithium layer to form a lithium metal anode for a battery cell.

The invention relates to the technical field of battery manufacturing, in particular to a battery electrode manufacturing method which comprises the following steps: step 1, preparing raw materials; 2, performing hot melting treatment on the prepared raw materials to realize preparation of liquid raw materials; thirdly, the liquid raw material is subjected to mold machining treatment, and machining of the metal cylinder is completed; fourthly, the metal cylinder is cut, and machining of a plurality of metal wafers is completed; 5, the multiple metal wafers are placed on a groove extrusion device to be subjected to extrusion treatment, manufacturing of the battery electrodes is completed, and the electrode plates can be automatically machined through the method.

The invention belongs to the technical field of lithium ion batteries, and particularly provides a multi-element synergistically doped nano-silicon negative electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, melting silicon and a doping element A at a high temperature, cooling, and crushing into nanoparticles to obtain silicon-based solid solution alloy powder; s2, uniformly dispersing the silicon-based solid solution alloy powder in a high-temperature organic solvent under the assistance of a surfactant to obtain dispersion liquid; and S3, adding a doping element B into the dispersion liquid, heating to realize multi-element atomic-scale doping, filtering, and washing to obtain the multi-element synergistically doped nano-silicon negative electrode material. According to the preparation method, atomic-scale uniform doping (not simple compounding of two phases) of multiple elements to silicon is realized through the eutectic alloy medium, and the silicon-based negative electrode material with excellent comprehensive performance is obtained through specific doping sequence design (the element which is in solid solution with the silicon is introduced firstly, and then the element which forms the eutectic alloy with the element is introduced).

The invention provides an alloy negative electrode material applicable to low external pressure, a preparation method and an all-solid-state lithium battery, and relates to the technical field of solid-state lithium batteries. The alloy negative electrode comprises an amorphous lithium-gallium alloy phase and amorphous lithium-silicon alloy particles, wherein the amorphous lithium-silicon alloy particles are dispersed in the amorphous lithium-gallium alloy. The alloy negative electrode is suitable for a solid-state lithium battery with low external pressure (1t, 10MPa) and high surface capacity, and can stably circulate more than 500 circles when being charged and discharged under the conditions of low np ratio and high current density, and lithium dendrites do not grow on the surface of the negative electrode.

The invention relates to the technical field of ultrathin lithium metal negative electrodes, in particular to a fiber carbon reinforced ultrathin lithium foil and a preparation method and application thereof. The thickness of the ultrathin lithium foil is less than or equal to 20 microns, and the ultrathin lithium foil is prepared from a fibrous carbon material loaded with zinc oxide as a raw material; the preparation method of the zinc oxide-loaded fibrous carbon material comprises the following steps: soaking natural fibers in a zinc salt solution, fully stirring, taking out, drying, and carrying out high-temperature carbonization under an anaerobic condition. According to the ultrathin lithium foil disclosed by the invention, the carbon powder obtained by grinding the biochar material loaded with zinc oxide is added, so that the mechanical strength and ductility of lithium metal are greatly improved, and the ultrathin lithium foil is not easy to crack and damage in the rolling process and can be rolled to an ultrathin thickness of less than or equal to 20 microns. The lithium battery cathode prepared from the ultrathin lithium foil has relatively good electrochemical properties such as cycle performance and coulombic efficiency, and the preparation method is simple, low in cost and suitable for large-scale industrial production.

An extruder includes: a supply module; a mixing module for forming an electrode slurry by mixing the active material, the binder, and the conductive material from the supply module; the discharging module is used for discharging the electrode slurry; and the sensor is used for measuring the characteristic value of the electrode slurry. The mixing module includes: a first screw and a second screw including threads on an outer circumference thereof for rotation while engaging with each other; a cartridge including a first cartridge and a second cartridge accommodating the first screw and the second screw, respectively, and facing each other to form a hole through which the electrode slurry is transmitted; the first gap adjusting module is used for adjusting a gap between the first barrel and the second barrel; and a control module for controlling the first gap adjustment module based on the measured feature value.

For making battery electrodes, a composite strip of a cast ribbon of an electrically conductive metal attached to and extending along an edge of a longitudinally elongate substrate with a plurality of spaced apart notches cast in the ribbon and opening to an edge of the ribbon spaced from the longitudinally elongate substrate. A rotatable drum with a mold cavity and a confronting casting shoe for supplying molten metal, such as liquid lead, to the cavity may be used in a casting machine to continuously cast the composite strip.

A negative electrode active material according to the present application includes a silicon-based active material having a grain size of about 300 nm or less. The silicon-based active material has a value defined by the formula (D90-D10) / D50 of about 2.00 or less, and contains an active material selected from the group consisting of SiOx (x = 0) and SiOx (0lt; xlt; 2), and contains about 70 parts by weight or more of SiOx (x = 0) with respect to 100 parts by weight of the silicon-based active material. In the formula, D90, D10, and D50 represent particle sizes corresponding to 90%, 10%, and 50% by volume in the size distribution, respectively.

Disclosed are a lithium-ion supply electrode for real-time microscopic analysis and a method of manufacturing same. The lithium-ion supply electrode includes a solid electrolyte layer including a solid electrolyte, a lithium layer formed on the solid electrolyte layer and including lithium, and a protective layer formed on the lithium layer and including a metal. Therefore, lithium in the electrode does not undergo oxidation in a short time. Therefore, the lithium-ion supply electrode can be used for real-time analysis of structural changes and interfacial reactions of lithium secondary battery materials using a transmission electron microscope.

Disclosed are a lithium-ion supply electrode for real-time microscopic analysis and a method of manufacturing same. The lithium-ion supply electrode includes a solid electrolyte layer including a solid electrolyte, a lithium layer formed on the solid electrolyte layer and including lithium, and a protective layer formed on the lithium layer and including a metal. Therefore, lithium in the electrode does not undergo oxidation in a short time. Therefore, the lithium-ion supply electrode can be used for real-time analysis of structural changes and interfacial reactions of lithium secondary battery materials using a transmission electron microscope.

Provided is a system for depositing a material. The system comprises a die and a flow guide. The die comprises an opening and a cavity communicating with the opening. The die is configured to extrude the material in a principal deposition direction through the opening. The flow guide is disposed in the cavity and is configured to shape a flow of the material extruded by the die. The flow guide comprises a flow narrowing portion and a flow shaping portion. The flow narrowing portion extends in a width direction perpendicular to the principal deposition direction so as to block the material from flowing through in the principal deposition direction. The flow shaping portion extends downstream from the flow narrowing portion in the principal deposition direction. A width of the flow shaping portion is smaller than, or decreases from, a width of the flow narrowing portion.

An extruder includes: a supply module; a mixing module to form an electrode slurry by mixing an active material, a binder, and a conductive material from the supply module; a discharge module to discharge the electrode slurry; and a sensor to measure a characteristic value of the electrode slurry. The mixing module includes a first screw and a second screw, the first screw and the second screw including screw threads on an outer circumference thereof to rotate to engage with each other; a barrel including a first barrel and a second barrel accommodating the first screw and the second screw, respectively, and facing each other to form a hole through which the electrode slurry is transmitted; a first gap adjustment module to adjust a gap between the first barrel and the second barrel; and a control module to control the first gap adjustment module based on the measured characteristic value.

A fluoropolymer binder composition for use in a lithium-ion secondary battery cathode is provided, which contains a tetrafluoroethylene polymer and an elastomeric fluoropolymer. A cathode composition containing the fluoropolymer binder composition together with cathode active particles and conductive carbon is also provided. The tetrafluoroethylene polymer is generally a high molecular weight non-melt processable tetrafluoroethylene homopolymer and modified tetrafluoroethylene homopolymer. The elastomeric fluoropolymer is generally a vinylidene fluoride elastomeric fluoropolymer. The cathode composition is formed by dry mixing the fluoropolymer binder, the cathode active material, and the conductive carbon by a solvent-free process and applying a shear force, which fibrillates the tetrafluoroethylene polymer. The cathode composition has a fluoropolymer binder uniformly dispersed in the main cathode active material, and has elasticity such that a thin film of the cathode composition can be formed into a cylindrical shape without breaking, enabling their usefulness as a lithium-ion battery cathode electrode film.

A lithium metal is physically pressed to a silicon wafer having a uniform intaglio or embossed pattern formed thereon in advance, or liquid lithium is applied to the silicon wafer and may then be cooled in order to form a uniform pattern on the surface of the lithium metal.

The present disclosure provides a negative electrode material, a preparation method thereof and a secondary battery. The negative electrode material comprises: lithium metal and a metal alloy, the metal alloy comprises a metal forming a solid solution with the lithium metal; the mass fraction of the lithium metal comprises 60% to 90%; the valence electron concentration of the metal alloy is less than 6.87; and the lithium metal utilization rate in the negative electrode material is higher than 35%.

The application discloses a battery zinc negative material forming process, comprising the following steps: 1), preparing pure zinc ingot; 2), homogenizing annealing the ingot obtained in step 1); 3), rolling the blank obtained in step 2) after heat preservation at 280-300 DEG C to form a plate strip with a thickness of 1.0-2.0 mm; 4), after annealing the plate blank obtained in step 3) at 270-300 DEG C for 20-40 min, first pass rolling is carried out, and the plate blank is rolled for 5-10 times; after the first pass rolling is completed, the thickness of the plate blank is reduced to 0.3-1.0 mm; 5), folding the plate blank obtained in step 4), annealing at 270-300 DEG C for 20-40 min, and then carrying out second pass rolling, folding and rolling for 5-10 times, and the rolling direction of the second pass is parallel to that of the first pass; after the second pass rolling is completed, the thickness of the plate blank is 0.4-0.8 mm; 6), the plate blank obtained in step 5) is used by tearing the overlapping part and taking the metal contact surface. The application can reduce the possibility of dendrite formation, thereby prolonging the service life of the battery.