65 results about "Lithium nitride" patented technology

The invention provides a modified lithium metal negative electrode and a preparation method and application thereof, and belongs to the technical field of lithium batteries. The modified lithium metal negative electrode comprises a negative electrode conductive substrate and an interface passivation layer formed on the surface of the negative electrode conductive substrate, and the interface passivation layer comprises lithium oxide, lithium sulfide, lithium nitride, lithium fluoride and a fluorocarbon compound; the interface passivation layer is obtained by putting lithium metal into chloroform for dipping treatment to obtain modified lithium metal and then performing plasma treatment. According to the lithium ion battery, the interface passivation film containing the lithium oxide, the lithium sulfide, the lithium nitride, the lithium fluoride and the fluorocarbon is formed on the negative electrode conductive substrate, and in the repeated charging and discharging process of the lithium ion battery, due to the existence of the interface passivation film, non-uniform deposition of lithium ions can be avoided, so that growth of lithium dendrites is inhibited. Furthermore, the coulombic efficiency and the cycling stability of the charge-discharge cycle of the lithium ion battery can be improved, and the service life of the lithium ion battery is prolonged.

The embodiment of the invention discloses a nano composite material and a preparation method, a use method and a device thereof, and the nano composite material is characterized by comprising a first nano particle and a second nano particle which are combined; the first nano-particles are transition metal nano-particles, and the second nano-particles are one or a combination of the following materials: lithium nitride nano-particles, lithium oxide nano-particles, lithium phosphide nano-particles, lithium selenide nano-particles and lithium sulfide nano-particles. The nano composite material can be subjected to magnetic regulation and control under low voltage, and high-speed and high-density electronic spin information storage is realized.

A lithium metal anode protective film according to one specific embodiment includes lithium nitride (Li3N) nanoparticles, lithium-magnesium (Li-Mg) alloy nanoparticles, or a combination thereof. The lithium metal negative electrode protective film can effectively inhibit the growth of lithium dendrites in the battery charging / discharging process by inducing the uniform electro-deposition behavior and distribution of lithium ions.

The invention provides a solid electrolyte, a preparation method and a lithium battery, the solid electrolyte comprises a nitrate ion liquid-based metal organic framework C, polyoxyethylene and LiTFSI, the nitrate ion liquid-based metal organic framework C accounts for 3wt% of the polyoxyethylene, and the molar ratio of the polyoxyethylene to the LiTFSI is 10: 1; wherein the nitrate ion liquid-based metal organic framework C has a nitrogen-containing heterocyclic ring, and nitrate ions and Zn ions are coordinated on the nitrogen-containing heterocyclic ring. In the solid electrolyte provided by the invention, nitrogen-containing heterocyclic cations in the nitrate ionic liquid-based metal organic framework have a binding effect on TFSI-anions in the lithium salt, and meanwhile, dissociation of the lithium salt is promoted, so that lithium fluoride is generated in situ. Moreover, nitrate ions obtain electrons on the surface of the lithium metal negative electrode, and the electrons and lithium ions form lithium nitride in situ on the SEI layer, so that deposition of dead lithium is reduced, and finally, the interface stability of the battery is remarkably improved.

This application relates to the field of electrolyte materials technology, and in particular to a method for preparing lithium selenide. The method includes: obtaining a precursor source, the precursor source including lithium nitride and a selenium source, and subjecting the precursor source to multiple calcination treatments to obtain lithium selenide. The present invention uses lithium nitride as a lithium source and a selenium source to undergo a redox reaction to generate lithium selenide and nitrogen gas. This method has a low cost, does not produce carbon impurities in the prepared product, and the prepared lithium selenide can be used directly as a high-purity raw material for solid electrolytes. In addition, the reaction between lithium nitride and selenium has low exothermic reaction, the reaction is easy to control, and the safety is higher, avoiding the problem of low safety caused by high exothermic reaction of elemental selenium and elemental lithium in the prior art.

The invention relates to the technical field of batteries, in particular to a lithium electrode and a preparation method thereof, a lithium battery and a lithium electrode preparation system. The preparation method of the lithium electrode comprises the following steps: bombarding at least one surface of a metal lithium layer by adopting first plasma and second plasma in sequence, and forming a first lithium nitride layer and a second lithium nitride layer on the surface of the metal lithium layer in sequence, wherein the first plasma comprises nitrogen plasma, and the second plasma comprises nitrogen plasma and inert gas plasma; the ratio of the bombardment time of the first plasma to the bombardment time of the second plasma is 1: (3-30); the ratio of the bombardment energy of the first plasma to the bombardment energy of the second plasma is (3-10): 1. According to the preparation method of the lithium battery provided by the invention, the compact lithium nitride layer with high ionic conductivity can be formed on the surface of the metal lithium layer, so that the electrochemical performance of the battery is improved.

The application discloses a preparation method and application of lithium nitride. The preparation method comprises the following steps: after surface treatment, metal lithium is placed in a nitrogen atmosphere to generate incomplete lithium nitride through a nitriding reaction; and the incomplete lithium nitride is crushed in an inert gas atmosphere and a plasma atmosphere to obtain lithium nitride. The lithium nitride obtained through the method is applied to lithium ion batteries as a lithium supplement additive. The lithium nitride obtained through the preparation method has small particle size, uniform distribution, high activity and high purity, and has high decomposition rate and low decomposition potential as the lithium supplement additive.

The invention provides a composite lithium metal negative electrode and a preparation method and application thereof, and belongs to the field of batteries. The composite lithium metal negative electrode comprises a lithium metal layer; the protective layer is arranged on the surface of one side of the lithium metal layer, the protective layer comprises a polyvinyl alcohol nanofiber layer and a lithium nitride interface layer, and the lithium nitride interface layer is located between the polyvinyl alcohol nanofiber layer and the lithium metal layer. A large number of polar groups are arranged on the polyvinyl alcohol nanofiber layer, and the polar groups can be in direct contact reaction with lithium ions to form C-O-Li bonds. On one hand, a C-O-Li bond can uniformly disperse the ion flux on the surface of the electrode, the migration efficiency of lithium ions is improved, meanwhile, uniform deposition of metal lithium is promoted, volume expansion is slowed down, and dynamic protection of the metal lithium is achieved; and on the other hand, the formed C-O-Li can provide active sites for nitriding treatment, and a homogeneous lithium nitride interface layer is constructed in situ below the C-O-Li, so that the cycle performance of the battery is remarkably improved.

The invention relates to a method for recovering lithium from a lithium metal battery, which comprises the following steps: (1) pretreating the lithium metal battery, namely discharging and / or charging the lithium metal battery, and then deflating and drying; (2) carrying out primary crushing on the dried lithium metal battery in nitrogen flow, and then standing for primary reaction; after the primary reaction is completed, performing primary screening to obtain powder A; (3) performing secondary crushing and secondary screening on the powder A obtained in the step (2) to obtain powder B; (4) carrying out airflow separation on the powder B obtained in the step (3) to obtain a mixture containing lithium nitride; and (5) introducing reaction gas into the mixture containing lithium nitride obtained in the step (4), and carrying out secondary reaction to obtain the lithium compound. The lithium metal battery can be safely recycled due to the fact that lithium metal can rapidly react in nitrogen flow to generate Li3N, and the total recycling rate of lithium reaches 95% or above.

This application provides a negative electrode material, a preparation method thereof, a negative electrode plate, a secondary battery, and an electronic device. The negative electrode material comprises: a pre-lithiated amorphous silicon-carbon composite; and a lithium titanate nitride coating layer covering at least a portion of the surface of the pre-lithiated amorphous silicon-carbon composite; wherein the pre-lithiated amorphous silicon-carbon composite comprises at least one of carbon nitride, titanium nitride, and lithium nitride. The negative electrode material provided herein can improve the initial coulombic efficiency, rate capability, and cycle performance of a secondary battery.

The invention discloses a composite lithium metal negative electrode material and a preparation method thereof, and relates to the technical field of electrochemical energy storage, and the method comprises the following steps: constructing a three-dimensional porous carbon skeleton with the aperture of 50-500 nanometers, and coating the inner wall of the three-dimensional porous carbon skeleton with a nitrogen-doped carbon layer with the aperture of 2-10 nanometers; melting metal lithium and lithium nitride to form a lithium-rich melt; molten lithium is made to permeate into pore channels of the framework through capillary force, and a C-Li-N gradient interface phase is generated in situ; performing program temperature control cooling to realize lithium directional solidification; depositing an amorphous aluminum oxide passivation layer of 50-150 nanometers on the surface; and performing aging treatment to obtain the final material. According to the technical scheme, uniform loading of lithium, high interface ionic conductivity, structural integrity and high safety are achieved, growth of lithium dendrites is remarkably inhibited, and cycling stability and energy density consistency are improved.

The invention provides a composite lithium metal negative plate, a preparation method thereof and a lithium metal secondary battery. The composite lithium metal negative plate comprises a metal lithium plate, and a composite interface layer is arranged on the surface of at least one side of the metal lithium plate; the composite interface layer comprises a lithium nitride layer and a lithium alloy layer which are sequentially stacked, and the lithium nitride layer is in contact with the metal lithium sheet; in the composite interface layer, the thickness ratio of the lithium nitride layer to the lithium alloy layer is (10-50): 1. The composite interface layer is constructed on the surface of the metal lithium sheet, so that the stability and the cycle performance of the lithium metal negative electrode are remarkably improved. Wherein the lithium nitride layer effectively inhibits direct contact between lithium and electrolyte, and side reaction is reduced; and the lithium alloy layer improves the deposition form of lithium and prevents formation of lithium dendrites by adding alloying metal elements, so that the safety of the battery is improved, and the cycle life of the battery is prolonged.

Systems and methods are provided for passivating lithium nitride (Li3N) for use in a lithium-ion battery as a cathode pre-lithiation reagent. In one example, the cathode pre-lithiation reagent may include a core particle composed of Li3N, and a passivation coating uniformly disposed on at least a portion of a surface of the core particle. In some examples, the passivation coating may cover a majority of the surface of the core particle or may substantially completely cover the surface of the core particle. The cathode pre-lithiation reagent may further be included in the lithium-ion battery, where the passivation coating may mitigate unwanted side reactions during processing and manufacturing. In this way, Li3N may be successfully and reproducibly utilized as a cathode pre-lithiation reagent, such that initial lithium ion consumption may be compensated and capacity of the lithium-ion battery may be concomitantly increased.

The invention belongs to the technical field of sulfide electrolyte, and discloses lithium polysulfide and sulfide solid electrolyte containing the lithium polysulfide, a preparation method of the lithium polysulfide comprises the following steps: S1, preparing lithium nitride by taking metal lithium as a lithium source; s2, raw materials are weighed according to the molar ratio of lithium nitride to sulfur powder being 2: (3-3.3), lithium nitride is equally divided into 2-4 parts, and lithium polysulfide is prepared through a step-by-step ball milling technology in the inert atmosphere; in the step S2, the step-by-step ball milling process comprises the following steps: adding sulfur powder and a first part of lithium nitride into a ball milling container with a pressure adjusting device, and carrying out ball milling at a rotating speed of 400-550rpm for 2-3 hours; then adding one part of lithium nitride every 2-3 hours, keeping the ball-milling rotating speed unchanged, and continuously performing ball-milling for 2-3 hours at the rotating speed of 400-550rpm after all the lithium nitride is added; the loss of elemental sulfur is supplemented in situ in the solid-phase sintering reaction of the electrolyte in the process of releasing elemental sulfur by heating and decomposing lithium polysulfide, and element segregation in the sintering process of the electrolyte is prevented.

The present invention relates to the field of membrane separation technology, and discloses a method for preparing a highly selective lithium superion conductor membrane. 7‑x La3Zr 2‑x Ta x O 12 Using lithium nitride (LLZTO) as an aggregate and polyvinyl alcohol as a sintering aid, the LLZTO was first pressed into a green compact via a sheeting technique, and then calcined at high temperature to produce an LLZTO membrane. To further enhance the density and separation performance of the LLZTO membrane, an organic crosslinking agent was introduced to modify the pores of the LLZTO membrane, resulting in a dense lithium superion conductor membrane. This lithium superion conductor membrane exhibits excellent ion separation performance, providing a reference for related fields such as the efficient recovery and extraction of lithium resources.

This invention relates to a method for preparing lithium nitride. By ball milling the initial lithium nitride material in a mixed atmosphere of nitrogen and argon in a specific ratio, the mass ratio of α-Li3N to β-Li3N in lithium nitride can be controlled within the range of (95-60):(5-40), thereby reducing the reactivity of lithium nitride itself and improving its stability in air. At the same time, when lithium nitride is added as a positive electrode lithium replenishment additive in the positive electrode material of lithium-ion batteries, lithium nitride exhibits the characteristics of low decomposition potential and high decomposition rate during the first charge cycle. Only a very small amount of lithium nitride is needed to compensate for the active lithium consumed during the formation of the SEI film. Lithium nitride has high compatibility and lithium replenishment performance in the positive electrode material of lithium-ion batteries.

The present disclosure provides a solid electrolyte material, a preparation method therefor and a lithium ion battery. The preparation method for a solid electrolyte material comprises: in an inert gas environment both the water content and the oxygen content of which are not higher than 0.01 ppm, performing ball milling on lithium nitride and tantalum halide in a mole ratio of 0.4-3:1, the ball milling rotating speed being not lower than 500 rmp, and the ball milling time being 30-300 h.

The invention relates to the technical field of lithium iodide material synthesis, in particular to a method for preparing anhydrous lithium iodide powder. Aiming at the defects that the traditional anhydrous lithium iodide preparation process is complicated, high in cost, difficult to purify, serious in pollution and the like, the invention discloses a method for respectively generating anhydrous lithium iodide microspheres and anhydrous lithium iodide powder by reacting lithium nitride and iodine under a heating condition or reacting lithium nitride and iodine under a ball milling condition. The anhydrous lithium iodide is generated in situ by using lithium nitride and iodine under the condition of heating or ball milling, so that one-step in-situ preparation of the anhydrous lithium iodide is realized, and the preparation process is greatly simplified. The method does not involve complex preparation and purification processes, the preparation process is simple and easy to control, green and environment-friendly, the cost is low, and industrial production is easy to realize. An electrochemical test result shows that a trace amount of anhydrous lithium iodide is added into the electrolyte, so that the discharge capacity of the lithium sulfide positive electrode can be effectively improved, and the first activation voltage potential barrier of the lithium sulfide positive electrode is reduced.

The invention discloses a green electrochemical ammonia production method, which comprises a reduction reaction tank and an oxidation reaction tank which are separated by a proton conduction / permeable membrane, according to the method, an electrolyte containing metal salt capable of participating in electrochemical reaction, an aromatic mediator and an organic solvent is mainly utilized, and high-efficiency conversion from nitrogen to ammonia gas is realized under the conditions of normal temperature and normal pressure; the cathode is subjected to lithium deposition and nitrogen activation reaction, lithium nitride is generated through an aromatic mediator, and ammonia gas is released through protonation; the anode performs a hydroxide reaction to provide a continuous and stable proton source; the method has high selectivity, energy efficiency and modularization potential, can replace a traditional high-energy-consumption Harber method, and is widely applied to green manufacturing procedures of ammonia fuel, fertilizer and hydrogen storage carriers.

The invention relates to a preparation method of high-purity lithium sulfide. The preparation method comprises the following steps: S1, reacting metal lithium in a nitrogen atmosphere to obtain lithium nitride; and S2, reacting the lithium nitride with sulfur vapor to obtain lithium sulfide. According to the method, the sulfur vapor is used as the sulfur source to generate the lithium sulfide with the lithium nitride for the first time, the operation is simple and controllable, the reaction is safer, and the problem that an explosive (S4N4) sulfur ammonia compound is easily generated when sulfur powder is used as the sulfur source to react with the lithium nitride in a traditional method is solved. Besides, the metal lithium is converted into lithium nitride in the nitrogen atmosphere and then reacts with the sulfur source, the lithium nitride is hard and high in melting point and cannot be melted due to heat accumulation in the reaction process, so that an over-strong self-propagating effect cannot occur, the whole reaction process can be controlled only by controlling the sulfur source, and the preparation method is simple and convenient. And the product has high purity, does not need secondary purification, and is more suitable for amplified preparation of lithium sulfide.

Provided is a lithium nitride manufacturing device (10) for heating a lithium member (9) in a nitrogen atmosphere to nitride the lithium member (9) such that lithium nitride is manufactured, the lithium nitride manufacturing device including: a reaction tank (1) where a nitriding reaction of the lithium member (9) is performed; a heating unit (2) that heats the lithium member (9); an atmosphere control unit (3) that controls a dew point in the reaction tank (1); and an atmosphere cooling unit (4) that cools an inside of the reaction tank (1).

The invention discloses a pretreated aluminum foil and a preparation method and application thereof.The preparation method comprises the steps that a conductive material, a high-molecular dispersing agent and N-methyl pyrrolidone are placed in a stirrer in proportion to be subjected to first stirring treatment, and first slurry is obtained after the conductive material, the high-molecular dispersing agent and the N-methyl pyrrolidone are evenly mixed; adding a lithium supplementing material and lithium nitride into the first slurry, and continuously carrying out second stirring treatment to obtain second slurry; transferring the second slurry into a sand mill, and carrying out sanding treatment to obtain third slurry; the granularity D50 of solid particles in the third slurry is less than 300nm; adding polyvinylidene fluoride into the third slurry, and carrying out third stirring treatment to obtain fourth slurry; coating the surface of the aluminum foil with the fourth slurry, drying, and forming a film from the coated fourth slurry to obtain a pretreated aluminum foil containing a coating; when the pretreated aluminum foil is applied to the lithium ion battery, the first-week coulombic efficiency, the cycle performance and the thermal safety of the lithium ion battery can be improved.

Provided is a lithium nitride composition for a sulfide-based inorganic solid electrolyte material including α-lithium nitride, wherein in a spectrum obtained by X-ray diffraction in which a CuKα ray is used as a radiation source, when a diffraction intensity of a diffraction peak present at a position of a diffraction angle 2θ=23.0±0.3° is represented by Iα and a diffraction intensity of a diffraction peak present at a position of a diffraction angle 2θ=32.0±0.3° is represented by Iβ, a value of Iβ / Iα is 4.50 or lower.

This invention provides a lithium metal anode, its preparation method, and its application. The lithium metal anode includes a lithium metal matrix and an activation layer covering at least a portion of its surface; the lithium metal matrix includes lithium and silver; the activation layer includes lithium nitride and a first silver halide, wherein the first silver halide includes silver iodide. This invention provides an activation layer with specific chemical activity on the surface of a silver-containing lithium metal anode. Silver iodide can form lithium transport channels, activating dead lithium and improving the battery's cycle performance. Simultaneously, Li3N is a good SEI component, which can inhibit dendrite growth, isolate the electrolyte from contact with the anode, reduce active lithium loss, and further improve battery cycle performance. Furthermore, halogens existing in the form of silver halides are resistant to high voltage and not easily oxidized; therefore, high-voltage cathode materials with higher energy density can be selected to achieve a significant improvement in the cycle performance of high-energy-density lithium metal batteries.

The present invention discloses a green electrochemical ammonia production method, comprising a reduction cell and an oxidation cell separated by a proton-conductive / exchange membrane. The method employs an electrolyte containing metal salts capable of participating in electrochemical reactions, aromatic mediators, and organic solvents to achieve an efficient conversion of nitrogen to ammonia under ambient temperature and pressure. At the cathode, lithium deposition and nitrogen activation occur, generating lithium nitride via the aromatic mediator, which is subsequently protonated to release ammonia. At the anode, a hydrogen oxidation reaction provides a continuous and stable proton source. The invention offers high selectivity, energy efficiency, and modular scalability, serving as a sustainable alternative to the conventional energy-intensive Haber-Bosch process, and is applicable to green processes for ammonia fuels, fertilizers, and hydrogen storage carriers.

The invention relates to the technical field of batteries, in particular to an electrolyte for secondary liquid injection, a secondary liquid injection method, a secondary battery and electric equipment. The electrolyte comprises a first electrolyte for primary liquid injection and a second electrolyte for secondary liquid injection; the first electrolyte comprises a first lithium salt; the second electrolyte comprises an optional second lithium salt; the mass ratio of the first lithium salt in the first electrolyte is higher than that of the second lithium salt in the second electrolyte, and the difference value of the mass ratios is 2%-30%. The lithium salt content of the first electrolyte and the lithium salt content of the second electrolyte in the electrolyte are greatly different, so that the formation of a thin SEI film rich in high-ionic-conductivity inorganic components (lithium fluoride, lithium nitride and the like) in the formation stage of the battery is promoted, and meanwhile, the fast charging performance and the cycle performance of the battery are improved.

The embodiment of the invention provides a negative pole piece and a preparation method thereof, a battery and electric equipment. The negative pole piece comprises a negative pole piece body and an interface film located on the negative pole piece body, the interfacial film comprises a first sub-film layer and a second sub-film layer which are connected with each other, the first sub-film layer is arranged on the negative pole piece body, the second sub-film layer is located on the side, away from the negative pole piece body, of the first sub-film layer, the first sub-film layer comprises a first inorganic lithiate, and the second sub-film layer comprises a second inorganic lithiate; the first inorganic lithium compound comprises at least one of LiF, lithium sulfide and lithium sulfur oxide, the second inorganic lithium compound comprises Li2O and at least one of lithium nitrogen oxide, lithium phosphorus oxide, lithium boron oxide, lithium nitride, lithium boride and lithium phosphide, and the compound compositions of the first inorganic lithium compound and the second inorganic lithium compound are different. The method can improve the cycle performance, the capacity retention performance, the low-temperature dynamics performance and the like of the battery.

The application discloses a preparation method of an imidolide lithium salt, comprising the following steps: (1) dissolving a lithium salt precursor in an organic solvent; adding Li3N and stirring the reaction at a certain temperature; wherein the lithium salt precursor contains a sulfonyl group; (2) removing the solvent in the reaction solution and drying to obtain the imidolide lithium salt. The method for directly preparing the imidolide lithium salt by using lithium nitride has the highest atomic economic efficiency, a simplified production process and lower cost, and can promote better commercial development of the imidolide lithium salt.

The present disclosure provides a solid electrolyte material, a preparation method therefor and a lithium ion battery. The preparation method for a solid electrolyte material comprises: in an inert gas environment both the water content and the oxygen content of which are not higher than 0.01 ppm, performing ball milling on lithium nitride and tantalum halide in a mole ratio of 0.4-3:1, the ball milling rotating speed being not lower than 500 rmp, and the ball milling time being 30-300 h.

The present disclosure relates to an electrochemical cell comprising a cathode, an electrolyte, and an anode with a laminated bi-layer structure. This bi-layer anode addresses interface instability challenges in lithium metal batteries through a protective first layer and high-capacity second layer that are mechanically integrated via rolling. The first layer comprises lithium-containing materials including lithium-magnesium alloy, lithium nitride, LLZO, or combinations thereof, providing interfacial stabilization and preventing polysulfide shuttling. The second layer comprises lithium-magnesium alloy, lithium titanate, or combinations thereof, contributing substantial capacity. This configuration eliminates interface resistance buildup, reduces costs through selective use of expensive protective materials, and enables practical utilization of high-magnesium content alloys.