947 results about "Metallic lithium" patented technology

To enable accurate estimation of a degree of deterioration of a secondary battery with a metal lithium layer on an anode.SOLUTION: A battery deterioration estimation device comprises a current measurement part, a voltage measurement part, a calculation part, and an estimation part. The current measurement part measures a discharge current of a secondary battery at predetermined timing immediately after the start of discharge of the secondary battery. The voltage measurement part measures a drop voltage that is a difference between a voltage of the secondary battery before the start of discharge and a voltage of the secondary battery at the predetermined timing. The calculation part calculates an internal impedance of the secondary battery at the predetermined timing from the measured discharge current and the measured drop voltage. The estimation part estimates a degree of deterioration of the secondary battery from the calculated internal impedance.SELECTED DRAWING: Figure 1

The embodiment of the invention provides a synthesis method and application of lithium sulfide. The synthesis method of the lithium sulfide comprises the following steps: providing a sulfur source and a lithium source; performing first treatment on the sulfur source to obtain sulfur vapor; performing second treatment on the lithium source to obtain molten metal lithium; and in an inert atmosphere, introducing the sulfur vapor into the molten metal lithium, and reacting to generate lithium sulfide. According to the synthesis method and application of the lithium sulfide provided by the embodiment of the invention, the sulfur source is converted into the sulfur vapor, the lithium source is converted into the molten metal lithium, and the gas-liquid out-phase reaction is carried out in the inert atmosphere, so that the reaction efficiency and the purity are improved, the process is simplified, the cost is reduced, and the high-purity requirement can be met; the purity can be improved through raw material pretreatment of sulfur steam and molten metal lithium, and the strict requirement of a solid-state battery for high-purity lithium sulfide is met.

The invention discloses a negative pole piece and a preparation method thereof, a bipolar pole piece and a preparation method thereof, a battery and an electric device. The negative pole piece comprises a first current collector and a second current collector, wherein the first current collector comprises a first side and a second side which are opposite to each other; the first active material layer and the second active material layer are sequentially arranged on the first side in the direction away from the first current collector, the first active material layer comprises metal lithium, and the second active material layer comprises metal lithium alloy. By adopting the negative pole piece or the bipolar pole piece, the problems of continuous thickening of an SEI film, continuous growth of lithium dendrites, lithium death, penetration of the lithium dendrites to a diaphragm and the like can be avoided, so that the cycle stability of a battery applying the negative pole piece or the bipolar pole piece is favorably improved.

The invention relates to a formation method of a lithium-free negative electrode battery, and belongs to the technical field of lithium batteries. The testing method comprises the following steps: standing at low temperature before first-circle charging to enable the interior of the battery to reach a steady state, carrying out short-time and low-electric-quantity charging by adopting large current, and charging and discharging for several circles by adopting small current after the interior of the battery reaches the steady state at room temperature. According to the formation process provided by the invention, a compact seed crystal layer formed by lithium cores can be formed on the surface of Cu in situ at low temperature and high current density, so that the physical binding force between a deposited lithium layer and a copper substrate is remarkably enhanced, and the contact resistance is reduced, thereby inhibiting the growth of moss or dendritic metal lithium and realizing low-porosity and high-compactness lithium deposition; and a more uniform and stable SEI film is formed through low-current deposition, so that the coulombic efficiency and the cycling stability of the battery are improved.

The invention discloses an iodine compound coated sulfide solid electrolyte as well as a preparation method and application thereof, and relates to the technical field of batteries. The preparation method comprises the following steps: mixing and ball-milling coating liquid and sulfide solid electrolyte powder to obtain a mixture; carrying out solid-liquid separation on the mixture to obtain a solid, washing the solid, drying, and carrying out heat treatment to obtain a sulfide solid electrolyte coated with an iodine compound on the surface; wherein the coating liquid comprises the following components in percentage by mass: 0.1-10% of an iodine compound coating agent and 90-99.9% of a coating auxiliary agent. The surface of the particle can be modified, the dispersion condition of the sulfide electrolyte is improved, and the reaction activity between the sulfide electrolyte and the iodine compound is regulated and controlled; and shear force is provided through ball milling, and uniform liquid phase coating can be realized, so that the forming process of the coating layer is optimized, the thickness and compactness of the coating layer are regulated and controlled, and the interface stability of the sulfide solid electrolyte and the metal lithium negative electrode is improved.

The invention discloses a lithium precipitation rapid quantitative detection method and system, a storage medium and a program product, and relates to the field of equipment specially suitable for material research and analys.The method comprises the steps that after ethyl alcohol of a preset volume is dropwise added to the surface of a to-be-detected pole piece, real-time concentration data of hydrogen is collected; determining a time-varying curve of the hydrogen concentration; determining the reaction activity of metal lithium on the surface of the to-be-detected pole piece based on the curve; compensating and correcting the real-time concentration data of the hydrogen according to the reaction activity; and converting the corrected hydrogen concentration data into a lithium quality detection result. The hydrogen generation container is the closed reaction bottle, the needle connected with the hydrogen sensor is inserted into the reaction bottle, the hydrogen concentration can be rapidly detected, the hydrogen concentration in different reaction bottles can be rapidly detected by inserting different reaction bottles, and the detection process is in a closed environment. The method is used for improving the precision of quantitative detection of precipitated lithium, so that the frequency of electrode replacement and calibration is reduced, and the continuity and reliability of detection data in the production process are improved.

The invention discloses a method for preparing a lithium-copper composite negative electrode by utilizing lithium slag and application, and the preparation method of the negative electrode comprises the following steps: adding the lithium slag with certain concentration after removing impurities such as Ca < 2 + >, Mg < 2 + > and Fe < 3 + > through acid treatment into metal lithium in a molten state, and fully stirring until the reaction is complete; and coating the molten metal lithium obtained after the reaction on a current collector to obtain the modified lithium metal negative electrode plate. The prepared lithium-copper composite negative electrode has a lithium-loving 3D frame structure, volume expansion in the circulation process can be inhibited, lithium oxide, lithium aluminum alloy and lithium silicon alloy existing on the 3D frame structure can serve as lithium-loving sites for uniform lithium ion deposition, lithium dendrite growth is inhibited, and long-term stable circulation of the lithium metal negative electrode is promoted.

The invention relates to a doped modified argyrodite type solid electrolyte and a preparation method thereof, and belongs to the technical field of all-solid-state battery materials. The chemical formula of the electrolyte is Li < 5.5 + 2x + 2y > P < 1-x-y > Y < x > Bi < y > S < 4.5-1.5 x-1.5 y > O < 1.5 x + 1.5 y > Cl < 1.5 >, x is greater than or equal to 0.01 and less than or equal to 0.04, and y is greater than or equal to 0.01 and less than or equal to 0.04; the yttrium element and the bismuth element are doped at the P site of the argyrodite type electrolyte, and the oxygen element is doped at the S site of the argyrodite type electrolyte. After the argyrodite type electrolyte is in contact with metal lithium, an interface protection layer rich in lithium oxide can be formed in situ at an interface in a circulating process, so that lithium can be uniformly deposited, the generation of interface side reaction is inhibited, the interface stability of the argyrodite type electrolyte to a lithium metal negative electrode is improved, and the polarization voltage of a symmetrical battery is reduced; and the cycling stability of the all-solid-state lithium metal battery is enhanced.

A battery cell and a manufacturing method therefor, a battery, an electrical device, and a pre-lithiated positive electrode sheet and a manufacturing method therefor. The preparation method for the battery cell comprises the steps of: providing a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, an insulating coating slurry and lithium metal simple substance material; coating the surface of a positive electrode active material layer with the insulating coating slurry, and drying same to form an insulating coating; attaching the lithium metal simple substance material to the surface of the insulating coating so as to obtain a pretreated positive electrode sheet; assembling the obtained pretreated positive electrode sheet, the separator and the negative electrode sheet to obtain an electrode assembly; and assembling the obtained electrode assembly and the electrolyte to obtain the battery cell. Under the function of the electrolyte, the pretreated positive electrode sheet realizes a pre-lithiation reaction by means of a self-discharge effect and forms a pre-lithiated positive electrode sheet. The battery cell has a high initial coulombic efficiency, good cycle performance and good processability.

The invention belongs to the technical field of all-solid-state sulfide lithium metal batteries, and relates to a lithium battery electrode containing an interface self-repairing coating as well as a preparation method and application of the lithium battery electrode. The electrode comprises a lithium metal negative electrode substrate and the interface self-repairing coating coated on the surface of the lithium metal negative electrode substrate, the interface self-repairing coating is internally provided with a dynamic reversible network, and the dynamic reversible network is constructed by disulfide bonds and hydrogen bonds. A layer of interface self-repairing coating is formed on the surface of a lithium metal negative electrode substrate to serve as a physical isolation barrier, metal lithium and sulfide electrolyte are isolated and prevented from being directly subjected to reduction reaction, and coating microcracks generated by volume change in lithium metal circulation can be repaired, so that the possibility of interface exposure caused by coating breakage is reduced, and the service life of the lithium metal negative electrode is prolonged. Meanwhile, good interface contact can be kept, the synergistic effect of stable interface impedance, lithium dendrite inhibition and long-term cycle performance improvement is achieved, and the long-term cycle stability of the all-solid-state lithium battery is improved.

The invention relates to the technical field of lithium ion battery modeling and health state evaluation, and discloses a lithium battery SOH prediction method based on a multi-physics field coupling model, and the method comprises the following steps: firstly constructing an electrochemical model containing SEI film growth and lithium deposition; a lithium battery multi-physical field model is formed through coupling of the thermal field and the force field; then, SEI film thickening and lithium deposition side reaction are coupled to form a side reaction lithium loss model of a coupled multi-physical field, SOH prediction is conducted on the lithium battery, then parameters are optimized, and a final side reaction lithium loss model is obtained; according to the method, through coupling modeling of the three physical fields of electrochemistry, thermology and mechanics, the internal side reaction behavior of the lithium battery is comprehensively described, two key reaction mechanisms of SEI film growth and metal lithium deposition are mainly introduced, and the lithium battery internal side reaction loss model is obtained. The regulation and control effects of the temperature and the stress on the reaction rate and the lithium loss can be dynamically reflected.

The invention provides a multifunctional carbon fiber lithium battery based on a sulfide composite electrolyte membrane and a preparation method and application of the multifunctional carbon fiber lithium battery, and belongs to the technical field of lithium batteries and functional composite materials. According to the invention, a nitrogen phosphide interface layer is constructed on the surface of a sulfide electrolyte membrane or a nitrogen phosphide derivative is dispersed in a bulk phase, so that the stability of an electrolyte and a metal lithium interface is effectively improved, and lithium dendrites are inhibited; and by combining the multifunctional characteristics of the carbon fiber and glass fiber woven cloth, high specific energy and light weight can be realized, the overall safety and mechanical strength are enhanced, and the composite material is suitable for various high-performance energy storage occasions.

The invention belongs to the technical field of lithium organic batteries, and provides a conjugate extended lithium-containing organic positive electrode material and a preparation method and application thereof. The synthesis process of the positive electrode material comprises the following steps: firstly, taking tetraamino p-benzoquinone as a raw material, and carrying out oximation modification reaction on the tetraamino p-benzoquinone to generate tetraamino p-oximic acid; then, carrying out composite treatment on the TAPO and a lithium source to obtain lithium tetraamino p-oximate; and finally, through a condensation polymerization reaction, further preparing to obtain the polybenzoquinone-pyrazine extended lithium oximate. Through specific chemical treatment, the organic material contains a lithium element, so that the dependence on an external lithium source (such as a metal lithium negative electrode or a lithium supplement agent) is eliminated. Through ingenious molecular design and synthesis strategies, the conductivity of the material is improved, and the rate capability, the solubility resistance, the high-temperature stability and the cycle life of the material are remarkably enhanced, so that a solid foundation is laid for long-term stable operation and high-performance expression of a battery.

The invention belongs to the technical field of lithium batteries, and particularly relates to a composite metal lithium material, a preparation method and application thereof and a composite metal lithium negative electrode. The composite metal lithium material comprises metal lithium, and lithium titanate and a carbon material which are dispersed in the metal lithium. The composite metal lithium negative electrode is prepared from the composite metal lithium material through hot pressing, lithium titanate and a carbon material serve as a lithium-loving supporting structure, the interface stability and the structural stability of the composite metal lithium negative electrode in the circulation process can be synergistically improved, and the advantage of high capacity of lithium metal is kept; and the problems of infinite volume change of the lithium metal negative electrode and uncontrollable growth of lithium dendrites are solved, so that the composite metal lithium negative electrode has excellent cycling stability. The preparation method of the composite metal lithium negative electrode has the advantages of being easy to operate and good in repeatability.

The invention discloses a lithium metal battery and a modified cathode thereof. The preparation method of the negative electrode comprises the following steps: providing a clean metal lithium sheet; providing, as a treatment agent, an organic solution containing a compound of general formula R-A-X, where R is an aliphatic hydrocarbon group or an aromatic hydrocarbon group, A is at least one metal selected from the group consisting of Mg, Al, Zn, K, Na, Ca, Sn, In and Fe, and X is at least one halogen selected from the group consisting of F, Cl, Br, I and At; and carrying out surface chemical treatment on the metal lithium sheet by using a treating agent under a protective atmosphere to prepare the negative electrode. The interface layer is formed on the surface of the lithium metal, so that on one hand, the lithium alloy contained in the interface layer can remarkably promote rapid transmission of lithium ions and effectively inhibit growth of lithium dendrites; on the other hand, the contained halide can be dissolved in the electrolyte in the cycle process of the battery to react with dead lithium generated by the lithium metal negative electrode to generate active lithium, so that the performance of the battery is remarkably improved.

A modified lithium-rich manganese-based positive electrode material, and a preparation method therefor and the use thereof. The modified lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based positive electrode material, wherein the bulk phase of the lithium-rich manganese-based positive electrode material is doped with a high-valent transition metal element, and the surface phase of the lithium-rich manganese-based positive electrode material has a lithium metal compound coating layer and an oxygen vacancy. In the modified lithium-rich manganese-based positive electrode material, the doping with a bulk-phase high-valence transition metal element, the coating with a surface-phase lithium metal compound coating layer and the construction of an oxygen vacancy are conducted at the same time; and by means of the co-action of the three, the rate capability and the cycling performance of the lithium-rich manganese-based positive electrode material can be significantly improved, which is of great significance for the further commercialization of the lithium-rich manganese-based positive electrode material.

The invention provides a preparation method of a fully-active lithium-silicon alloy negative electrode material, which comprises the following steps: (S1) adding lithium foil and silicon powder treated by hydrofluoric acid into a ball milling tank, and performing ball milling in an inert atmosphere to obtain mixed powder; (S2) pressing the mixed powder into a compact precast block; heating the precast block to 450-550 DEG C by using a smelting furnace, and keeping the temperature for 10-20 minutes, so that the lithium part is molten to wet the silicon; (S3) the temperature is increased to the reaction temperature of 680-850 DEG C, heat preservation reaction is carried out for 10-30 min, metal lithium and silicon are fully reacted, and molten alloy is obtained; and (S4) the molten alloy is sprayed to a water-cooled rotating copper roller through a quartz nozzle, the rotating speed of the rotating copper roller is 3000-5000 rpm, and the fully-active lithium-silicon alloy is obtained after cooling. The obtained lithium-silicon alloy has the characteristic of high amorphization, has extremely high ion-electron conductivity and relatively low hardness, and can relieve expansion and shrinkage of a negative electrode in a charging and discharging process, so that the rate capability and the cycling stability of a sulfide solid-state battery are improved.

The invention provides a negative plate of a solid-state battery. The negative plate comprises a current collector, a lithium-loving coating compounded on the current collector and a conductive layer compounded on the lithium-loving coating, the lithium-loving coating contains a lithium-loving element; the lithium-loving element comprises one or more of Mg, Pt, Sn, Ag, Al and Zn; and the conductive layer comprises a carbon material. By introducing the lithium-loving element and the high-potential material and utilizing a synergistic mechanism of the lithium-loving element and the high-potential material, the electrochemical window is further widened and the metal lithium deposition risk is reduced while the lithium deposition uniformity is improved. According to the negative electrode plate provided by the invention, the nucleation potential of the lithium-metal negative electrode plate and the resistance of the conductive material are controlled within a specific range, so that nucleation of lithium ions on the surface of the negative electrode current collector can be facilitated, meanwhile, the nucleation uniformity of the lithium ions on the surface of the negative electrode current collector can be improved, and the cycle life of the battery is further prolonged.

The invention relates to the technical field of lithium battery charging application, and discloses a lithium metal battery service life prolonging method based on a bidirectional pulse charging strategy. According to the method for prolonging the service life of the lithium metal battery based on the bidirectional pulse charging strategy, the deposition of a lithium metal negative electrode in the charging and discharging process of the battery is more uniform and compact by adjusting the frequency, duty ratio, forward and reverse amplitude and the like of the bidirectional pulse charging current, so that the polarization in the battery is improved, the irreversible capacity of the battery is reduced, and the service life of the battery is prolonged. The bidirectional pulse charging method can effectively improve the lithium dendrite precipitation phenomenon of the negative electrode, reduces the internal impedance and irreversible capacity loss of the battery, can improve the cycling stability and safety of the battery, and prolongs the service life of the lithium metal battery.

The invention belongs to the field of alkali metal batteries, and discloses an alkali metal alloy powder material and a preparation method, application and a product thereof, the alkali metal alloy powder material is alloy powder formed by an alkali metal element and at least one non-alkali metal element, the particle size is 1-100 microns, the atomic ratio of all elements in any single powder is highly consistent with the feeding ratio of raw materials, and the atomic ratio of all the elements in the powder is 1-100 microns. The high reducibility similar to alkali metal is maintained, the electronic conductivity is larger than 0.01 mS / cm, the average chemical valence state is smaller than 0.5 valence, and the electrochemical potential relative to metal lithium or metal sodium is 0-2 V. The preparation method comprises the following steps: heating and melting an alkali metal raw material to form an alkali metal melt, introducing a non-alkali metal raw material into the alkali metal melt, cooling to obtain an alkali metal alloy ingot, and physically grinding the alkali metal alloy ingot in a protective atmosphere to obtain powder with uniform components. The invention aims to provide a high-activity alkali metal alloy material in a powder form so as to fill the blank of the industry.

The invention discloses a reference electrode, and relates to the technical field of batteries. The reference electrode comprises a conductive assembly and a diaphragm assembly, the conductive assembly comprises an exposed conductor section and an insulating section, the exposed conductor section is wrapped in the diaphragm assembly, a coating is arranged on one side, facing the exposed conductor section, of the diaphragm assembly, and a metal lithium layer is plated on the surface of the exposed conductor section. Through the structure, the service life and the voltage stability of the reference electrode can be remarkably improved, so that the accuracy and the reliability of battery test data are guaranteed.

The present application provides a silicon carbon negative electrode material, a negative electrode sheet including the same, a secondary battery, a battery module, a battery pack and a power consumption apparatus. A battery composed of a negative electrode prepared by the silicon carbon negative electrode material in the present application as a working electrode, metal lithium as a counter electrode and an electrolyte containing a lithium ion conductive substance may be charged and discharged, and in a case of drawing a relationship graph between a differential value dQ / dV obtained by differentiating a charging and discharging capacity Q by a working electrode potential V and the working electrode potential V, when energizing the negative electrode material in a direction of delithiation, a ratio of a maximum Y of dQ / dV between 400-480 mV to a maximum X of dQ / dV between 200-255 mV may be in a range of 3.5 to 15.

The invention relates to the technical field of recycling of waste lithium iron phosphate batteries, in particular to a method for extracting lithium from a positive electrode material of a waste lithium iron phosphate battery. The method comprises the following steps: (1) crushing the waste lithium iron phosphate battery, and sorting positive electrode powder; (2) two-stage leaching: adding a sulfuric acid solution into the lithium iron phosphate positive electrode powder to control the leaching pH value, and carrying out selective leaching; (3) two-stage impurity removal: controlling the impurity removal pH value to remove impurities, and adopting ultrasonic to enhance the impurity removal effect; and (4) precipitating lithium carbonate. According to the method, two-stage leaching is adopted for the positive electrode material of the waste lithium iron phosphate battery, so that the leaching effect of lithium is guaranteed, the leaching rate of lithium is 99.5% or above, the impurity removal effect of the lithium leachate is enhanced through ultrasonic waves, impurity removal precipitates are uniform, the slag type is good, the filtering performance is good, the entrained valuable metal lithium is less, the impurity content in the lithium solution is reduced, and the quality of a lithium carbonate product is guaranteed.

The invention discloses modified ultrathin lithium as well as a preparation method and application thereof. The modified ultrathin lithium provided by the invention comprises metal lithium and a doping agent doped in the metal lithium, the dopant is selected from metals having an electronegativity greater than the electronegativity of the metal lithium. The modified ultrathin lithium provided by the invention is used as the anode material of the lithium battery, so that the stability in dry air is remarkably improved, the reaction activity of the metal lithium is effectively reduced, the side reaction of an anode interface in the cycle process of the battery is inhibited, and the cycle life of the battery is remarkably prolonged. And on the other hand, the ultrathin lithium modification method provided by the invention is simple in preparation method and has very strong industrialization potential.

The invention discloses a synthesis method of nano magnesium metal and application of the nano magnesium metal in hydrogen storage, and the synthesis method of the nano magnesium metal comprises the following steps: dissolving lithium metal and 4, 4-bis (tert-butylbiphenyl) into a polar organic solvent to obtain a 4, 4-bis (tert-butylbiphenyl) lithium solution, and then adding the 4, 4-bis (tert-butylbiphenyl) lithium solution into the polar organic solvent to obtain the nano magnesium metal. Adding the 1, 4-bis (tert-butylbiphenyl) lithium solution into a non-polar alkane organic solvent to obtain a mixed solution; adding anhydrous magnesium chloride into a polar organic solvent to obtain an anhydrous magnesium chloride organic solvent solution; and adding the anhydrous magnesium chloride organic solvent solution into the mixed solution, carrying out a reaction in an argon atmosphere, and carrying out post-treatment to obtain the nano magnesium metal, wherein the molar mass ratio of the 4, 4-bis (tert-butylbiphenyl) to the anhydrous magnesium chloride is (0.5-3): 1. The nano magnesium metal synthesized by the synthesis method has the advantages of high hydrogen storage capacity, low hydrogen absorption and desorption operation temperature and high hydrogen absorption and desorption speed.

The invention relates to a method for high-value recovery of a positive electrode material of a waste lithium iron phosphate battery, which mainly comprises the following steps: adding a lithium iron phosphate positive electrode material, ammonium chloride and hydrogen peroxide into a ball milling tank for grinding, controlling the mass ratio of the ammonium chloride to the lithium iron phosphate positive electrode material to be 5: 2-7: 2, and controlling the volume mass ratio of the hydrogen peroxide to the lithium iron phosphate positive electrode material to be (18-22): 1mL / g; after grinding, washing out the mixture from the ball-milling tank by using deionized water, and then carrying out water leaching treatment to fully leach out metal lithium; excessive ammonium fluoride is added into the filtrate, and reaction liquid and a product lithium fluoride are obtained after reaction; and carrying out adsorption treatment on the reaction liquid by using defluorination resin, regenerating the defluorination resin through elution, combining and concentrating the collected effluent and eluent to obtain an ammonium chloride solution, and recycling the ammonium chloride solution to a chlorination reaction stage. According to the invention, through H2O2 reinforced mechanical chlorination coupling fluorination reaction, nearly total recovery of the waste lithium iron phosphate battery positive electrode material and high value of the product are realized, and the process is simpler and more environment-friendly.

The invention discloses a modified solid-state electrolyte and a preparation method and application thereof, and relates to the field of solid-state batteries, in 300 crystal face grain size distribution of the modified solid-state electrolyte, Kn90 = (Ln90-Ln10) / Ln50, and Kn90 is more than or equal to 0.5 and less than or equal to 1.7; wherein Ln10 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 10%, and Ln50 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 50%; ln90 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 90%. According to the invention, the modified solid electrolyte has excellent ionic conductivity, good air stability, interface stability to metal lithium and relatively high oxidation potential stability.

The utility model discloses an oil-free shearing device for lithium metal, which belongs to the field of metal calendaring processing equipment and comprises a die and a cutter device, the cutter device is coaxially and rotatably connected with the top end of the die, a plurality of die holes are uniformly arranged in the die in the circumferential direction, an air passage is arranged in the center of the die, and the air passage is communicated with the die. An air hole is formed in the side wall of the mold and is communicated with the air passage; a communicating groove is formed in the bottom wall of the mold, and the air channel and the mold hole are both communicated with the communicating groove. When metal lithium is extruded and sheared, argon is introduced through the air holes, the temperature of a shearing area is reduced, white oil can be prevented from being used, secondary shearing can be avoided, and the product quality and the production efficiency are improved.

Generally described herein are multiphase electroactive materials and associated articles (e.g., electrodes), systems (e.g., electrochemical devices), and methods. In certain embodiments, an electroactive material comprises a first component and a second component that is softer than the first component. The first component and the second component may be intermixed such that the second component is dispersed throughout a bulk of the first component. In some embodiments, the first component comprises a first alkali metal (e.g., metallic lithium) and the second component comprises a second alkali metal (e.g., metallic sodium) and a third alkali metal (e.g., metallic potassium).

This application relates to the technical field of separators, and in particular, to a separator and a preparation method thereof, a coating slurry and a preparation method thereof, an electrode assembly, a battery, and an electrical device. The separator includes a first isolation layer, a coating, and a second isolation layer. The coating is disposed on at least one surface of the first isolation layer. The coating includes a solid electrolyte material. The second isolation layer is disposed on a surface of the coating, the surface being away from the first isolation layer. The solid electrolyte material can react with metallic lithium to absorb lithium dendrites to prevent the lithium dendrites from penetrating the separator.