88 results about "Lithium nitride" patented technology

A secondary battery and an apparatus. The secondary battery comprises a positive electrode sheet, a negative electrode sheet and an electrolyte, wherein the electrolyte comprises a silane compound containing at least one carbon-carbon double bond and a nitrogen-containing compound, the negative electrode sheet comprises a negative electrode active material layer and a solid electrolyte interfacial film located on a surface of the negative electrode active material layer, and the solid electrolyte interfacial film comprises lithium nitride and a substance containing a silicon-carbon bond; and, an X-ray photoelectron spectrometer is used for testing, the peak area of the nitrogen element in the lithium nitride is X, and the peak area of the silicon element in the substance containing a silicon-carbon bond is Y, where 1<X / Y<6.

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 invention discloses a coating method for improving the ionic conductivity and air stability of a lithium lanthanum zirconium oxide solid electrolyte, which comprises the following steps: step 1, preparing an M element doped lithium lanthanum zirconium oxide solid electrolyte by adopting first sintering at the sintering temperature of 900-1000 DEG C and the heat preservation time of 6 hours, and taking out the M element doped lithium lanthanum zirconium oxide solid electrolyte; crushing and sieving the prepared blocky material to obtain a granular material higher than 100 meshes, and drying and storing the granular material in a polypropylene bottle; 2, the granular material is subjected to secondary low-temperature sintering, the M-element lithium lanthanum zirconium oxide material is coated with lithium nitride, the adding proportion of the lithium nitride is 0 wt%-0.9 wt%, the sintering temperature is 850-900 DEG C, the heat preservation time is 4 h, and after secondary coating sintering, the M-element lithium lanthanum zirconium oxide material coated with the lithium nitride is obtained through crushing and screening of 100 meshes; and step 3, pressing the finally sintered material in the step 2 into an electrolyte sheet through an isostatic press, and then carrying out third high-temperature sintering at the sintering temperature of 1200-1300 DEG C for 40 minutes to finally obtain the finished electrolyte sheet.

To provide a lithium nitride manufacturing method that quickly forms lithium nitride and can stably produce lithium nitride.SOLUTION: The lithium nitride manufacturing method includes a step (A) of preparing a lithium member embedded with inorganic particles, and a step (B) of allowing the lithium member in a state of being embedded with inorganic particles and nitrogen to contact with each other for nitriding the lithium member.SELECTED DRAWING: None

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.

The invention relates to the technical field of lithium batteries, and provides a secondary battery and a preparation method thereof, which are at least beneficial to improving the performance of the secondary battery. The preparation method comprises the following steps: carrying out winding treatment or lamination treatment on a positive plate, a diaphragm and a negative plate, then putting the positive plate, the diaphragm and the negative plate into a shell, and injecting an electrolyte into the shell to obtain the secondary battery, the preparation method of the positive plate comprises the following steps: preparing lithium ferrite, lithium nickelate, lithiated carbon nanotubes and a spinning auxiliary agent into a precursor solution; depositing the precursor solution on the surface of a positive electrode current collector through electrostatic spinning so as to form an initial fiber membrane on the surface of the positive electrode current collector; the positive electrode current collector with the initial fiber membrane is pre-sintered in air and then calcined in inert gas, so that the initial fiber membrane is converted into a fiber lithium supplementing layer, and the fiber lithium supplementing layer is of a fiber network structure; and coating a positive electrode material layer on the surface of the fiber lithium supplementing layer, and drying to obtain the positive plate.

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.

Provided in the present application are an electrode material and a preparation method therefor, an electrode sheet and a preparation method therefor, a battery and an electric device. The electrode material comprises a base material and a first inorganic lithiation substance layer, which coats at least part of the surface of the base material, wherein the base material comprises a pre-lithiated electrode active material; and the first inorganic lithiation substance layer comprises at least one of lithium oxide, lithium nitride, lithium carbonate, lithium fluoride, lithium sulfide or lithium phosphide.

The invention discloses an interface modification layer as well as a preparation method and application thereof. The interface modification layer comprises an electron barrier layer and a lithium-philic interlayer which are sequentially arranged on the surface of a solid electrolyte, the material of the electron blocking layer is selected from at least one of lithium oxyphosphorus nitride, lithium fluoride, lithium nitride, lithium chloride, lithium bromide, lithium iodide and lithium oxynitride, and the material of the lithium-loving interlayer is selected from at least one of germanium, silver, gallium, sodium, potassium, magnesium, aluminum, calcium, strontium, barium and titanium. The interface modification layer can prevent lithium nucleation induced by electron leakage in the solid electrolyte, reduce the risk of short circuit, reduce the interface impedance, improve the lithium ion flux uniformity and interface wettability, and improve the overall performance and cycle stability of the battery.

The present invention provides a method for preparing lithium sulfide, the method comprising the following steps: (1) preparing lithium nitride by reacting cheap nitrogen with metallic lithium in the presence of an inert atmosphere or under vacuum conditions, and controlling the residual amount of metallic lithium in the lithium nitride to be within a preset safety threshold; (2) mixing the lithium nitride obtained in step (1) with elemental sulfur in a certain proportion to react and obtain lithium sulfide. The present invention adopts a two-step method to prepare lithium sulfide, which has the following advantages: 1. The two-step method avoids the danger of explosion caused by violent reaction by directly mixing metallic lithium and elemental sulfur using a high-temperature melting method, and safety is guaranteed; 2. Lithium nitride is prepared using cheap nitrogen, which can be mass-produced and all processes do not require high-temperature treatment, with low energy consumption and obvious low-cost advantages; 3. In the preparation process of lithium sulfide, nitrogen is released, hydrogen is not used, and no dangerous gases such as hydrogen sulfide are generated, which is green, safe and environmentally friendly.

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.

The invention provides a modified lithium metal electrode, a preparation method and application thereof, and a lithium ion battery containing the modified lithium metal electrode. The modified lithium metal electrode comprises lithium metal and a surface interface film attached to the surface of the lithium metal, the surface interface film contains lithium chloride and lithium nitride; in the modified lithium metal electrode, the content of Cl element is 0.4%-0.8%, and the content of N element is 0.4%-0.8%. The modified lithium metal electrode comprises a surface interface film containing lithium chloride and lithium nitride, has high compatibility with an ether electrolyte, has high electronic insulativity, low ion diffusion barrier and excellent mechanical stability, remarkably inhibits formation and growth of lithium dendrites, and has the advantages of low cost and high efficiency when being used for a lithium ion battery. And the cycling stability and the safety performance of the battery are effectively improved.

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.