451 results about "Lithium compound" patented technology

The invention relates to the technical field of lithium ion batteries, in particular to a lithium-doped silicon-carbon composite material, a preparation method thereof, a negative plate and a lithium ion battery. The preparation method of the lithium-doped silicon-carbon composite material comprises the following steps: carrying out reduction reaction and activated pore-forming on a mixed material containing a carbon source, an organic pore-forming agent, a lithium supplement agent and a reducing agent to obtain lithium-doped porous carbon; performing first deposition on the lithium-doped porous carbon and mixed gas containing an inorganic lithium compound and an organic lithium compound; carrying out second deposition on the material obtained after the first deposition and silane gas to obtain a lithium compound doped silicon carbon precursor material; and mixing the lithium compound doped silicon carbon precursor material, an organic metal compound, asphalt and an organic solvent, performing spray drying, and then performing carbonization. According to the preparation method, the initial efficiency and the power performance of the silicon-carbon composite material can be improved.

The invention discloses a lithium iron manganese phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries, the lithium iron manganese phosphate positive electrode material at least comprises lithium iron manganese phosphate particles and a coating layer coating the lithium iron manganese phosphate particles; the raw material of the coating layer comprises an aluminum fluoride embedded poly (ethylenedioxythiophene)-lithium polystyrene sulfonate compound. And the coating layer can be used as a physical barrier to form dynamic interface protection, so that dissolution of manganese and erosion of electrolyte are directly inhibited, and side reaction between the electrolyte and the positive electrode material is reduced. Meanwhile, a more flexible transmission channel is provided for lithium ions and electrons, the conductivity of the positive electrode material is enhanced while the transmission efficiency of the lithium ions is improved, and the lithium manganese iron phosphate positive electrode material with stable structure, high rate capability and cycling stability is obtained.

The invention provides a silicon-based material and a preparation method thereof, a negative pole piece and a solid-state battery. The silicon-based material comprises an inner core and a surface coating layer, the inner core comprises a silicon-based negative electrode material, the surface coating layer is a carbon fluoride layer, the carbon fluoride layer internally comprises Li-M, LiF and LiX, M represents a metal element and is selected from at least one of Ag, Mg, Zn and Al, and X represents a non-metal element and is selected from at least one of N, S and P. The silicon-based negative electrode material is used as a core, the surface of the silicon-based negative electrode material is coated with the carbon fluoride layer, and the Li-M alloy / LiF / LiX composite lithium compound is introduced into the carbon fluoride layer, so that triple effects of ion-electron double-conduction network construction, interface chemical stabilization and mechanical buffer enhancement are achieved; and the chemical stability of an interface between the silicon negative electrode and sulfide solid electrolyte is improved while the rate capability of the negative electrode is improved and the expansion and shrinkage of the silicon negative electrode are relieved, and the cycling stability is improved.

The invention provides a silicon negative electrode material, a preparation method and a lithium ion battery, and relates to the technical field of battery negative electrode materials. Stable lithium compound nano-particles are deposited or converted on the inner wall of porous carbon, silicon or silicon oxide or silicon-lithium alloy is induced to form nano-particles in the vapor deposition process, and the nano-particles are distributed with the lithium compound nano-particles as the center. The lithium compound has a high boiling point, can stably provide crystallization sites for silicon during vapor deposition, and prevents agglomeration of silicon nanoparticles; the inorganic lithium compound is a lithium ion conductor, has high mechanical strength, can improve the dynamics of the silicon negative electrode during lithium intercalation and deintercalation, and slows down the expansion of the silicon negative electrode.

The invention discloses a spodumene concentrate resourceful treatment method which comprises the following steps: carrying out wet treatment on spodumene acid clinker to prepare lithium-removed filter residues and leachate; carrying out neutralization treatment and desulfurization treatment on the leachate to obtain a lithium-containing purified solution, gypsum and iron oxide red, and carrying out lithium extraction treatment on the lithium-containing purified solution to obtain a lithium salt and mirabilite; the lithium-removed filter residues are treated through a process combining a beneficiation method and a chemical method, and water glass, nano kaolinite, ceramsite aggregate and tantalum-niobium concentrate are obtained. According to the method, whole-process slag-free production of the spodumene concentrate is achieved, and meanwhile the lithium-containing compound with the high purity and the high quality is obtained; and various valuable products can be obtained.

The invention discloses a high-voltage lithium nickel manganese oxide positive electrode material and a preparation method thereof, a battery positive electrode and a battery, and belongs to the technical field of lithium ion battery materials. Comprising an inner core composed of a lithium-containing compound, the inner core is coated with a shell composed of tungstate, and a transition layer is arranged between the inner core and the shell. The tungstate has good chemical and thermodynamic stability, can prevent erosion of HF in the electrolyte, inhibit dissolution of transition metal, reduce the shuttle effect, and can greatly improve the capacity retention rate of the battery. The preparation method is simple in process steps and convenient for large-scale preparation. Meanwhile, the cathode material coated with magnesium tungstate, calcium tungstate or bismuth tungstate has good dynamic performance, the capacity and the rate capability are remarkably improved, meanwhile, the stability of the material is also remarkably improved, and a good application way is provided for application of the high-voltage type lithium nickel manganese oxide cathode.

A lithium iron phosphate / carbon / lithium-rich lithium iron oxide composite cathode material and a preparation method and an application thereof are provided. The preparation method includes the following steps: mixing iron salt, lithium compound, orthophosphate and an organic salt with water, to obtain a mixed slurry; performing a spray granulation on the mixed slurry, to obtain a precursor powder; and performing a heat preservation on the precursor powder in a protective atmosphere, to obtain a lithium iron phosphate / carbon / lithium-rich lithium iron oxide composite cathode material. The preparation method is based on the characteristics that electric double layer physical energy storage of porous carbon can enhance the rate, and lithium-rich lithium iron oxide additive can increase the system lithium source and prolong the service life, combined with the synthesis process of lithium iron phosphate and lithium-rich lithium iron oxide, a lithium iron phosphate / carbon / lithium-rich lithium iron oxide composite cathode material is synthesized by one-step method.

A positive electrode active material for a rechargeable lithium battery, a positive electrode including the positive electrode active material, and a rechargeable lithium battery including the positive electrode are disclosed. The positive electrode active material includes first particles comprising a compound of Lia1Fex1B1y1PO4-b1 and having a first average particle diameter, and second particles comprising a compound of Lia2Nix2COy2Mnz2Xc2O2-b2 and having a second average particle diameter that is greater than the first average particle diameter. The content (e.g., amount) of the first particles is greater than the content (e.g., amount) of the second particles in the positive electrode active material.

Provided are methods of extracting lithium from a lithium containing solution, as well as the resulting compositions. The method includes supplying a lithium containing solution to a lithium capture step, the lithium capture step being operable to capture lithium from the lithium salt containing solution. The method further includes recovering lithium from the lithium capture step to produce a lithium rich stream. In especially preferred methods, the lithium capture step is performed to increase the lithium to sodium ratio above at least 1:1. Optionally, the lithium rich stream can be purified to remove divalent ions and borate ions. The lithium rich stream is then concentrated by supplying the lithium rich stream to a reverse osmosis step to produce a concentrated lithium rich stream.

A lithium replenishment composite material and its preparation method, as well as a positive electrode plate, a separator, a secondary battery, and an electrical device. The composite material includes a core and a coating layer containing a conductive material, which at least partially covers the core. The core comprises a lithium replenishment agent and a metal catalyst, wherein the lithium replenishment agent includes an organic lithium compound. During an initial charging cycle, the organic lithium compound releases lithium ions to replenish lithium in the negative electrode, while its byproducts decompose into gases that are expelled from the battery, thereby minimizing impact on mass energy density and long-term performance. The metal catalyst lowers the decomposition potential of the lithium agent, allowing lithium replenishment at lower voltage while protecting the positive electrode and electrolyte. The conductive coating suppresses metal dissolution, enhances conductivity, and improves the cycling performance of the battery.

The invention discloses a method for selectively recovering lithium from waste lithium iron phosphate batteries. The method comprises the following steps: carrying out ball milling activation on waste lithium iron phosphate powder and a grinding aid to obtain activated powder; and the activated powder is leached through an organic acid-hydrogen peroxide mixed leaching agent, slag and a lithium-containing solution are obtained, the lithium-containing solution is subjected to aftertreatment, and a lithium-containing compound is obtained through recycling. According to the method provided by the invention, through the synergistic cooperation of mechanical ball-milling activation and the specific organic acid-hydrogen peroxide system leaching agent, the use amount of leaching acid and the leaching temperature are reduced, the leaching rate and the recovery rate of lithium are improved, and meanwhile, the method is environment-friendly and is suitable for industrial production. And the resource recycling technology of the waste lithium iron phosphate battery is promoted to develop towards the green, efficient and economic direction.

Provided in the present application are a secondary battery and an electronic device. The secondary battery comprises a positive electrode sheet, a negative electrode sheet, and an electrolyte solution. The positive electrode sheet comprises a composite current collector and a positive electrode material layer provided on at least one surface of the composite current collector. The positive electrode material layer comprises a lithium nickel cobalt manganese oxide compound. On the basis of the total molar amount of metal elements other than lithium, the molar percentage content of nickel in the lithium nickel cobalt manganese oxide compound is X, wherein X>80%. The electrolyte solution comprises adiponitrile and succinonitrile. On the basis of the mass of the electrolyte, the mass percentage content of adiponitrile is B1, and the mass percentage content of succinonitrile is B2, wherein 0.01≤X×B1 / B2≤90. The present application can improve the capacity retention ratio and lithium ion acceptance of a secondary battery after a high- or low-temperature impact test.

The invention provides a composite lithium supplement agent and a preparation method thereof, a positive pole piece and a lithium ion battery, the composite lithium supplement agent comprises a lithium compound, a driving substance and a conductive carrier, the driving substance is at least one of P, B and As, and the preparation method comprises the following steps: mixing the lithium compound and the driving substance to obtain a first mixture; mixing the first mixture with a conductive carrier to form a second mixture; the second mixture is subjected to mechanical ball-milling treatment under the atmosphere of inert gas, and the nanoscale dispersed composite lithium supplementing agent is formed and has the characteristics of low decomposition voltage, high lithium supplementing capacity and no gas production, and residues are high-ion-conductivity lithium salt; the composite lithium supplement agent can significantly improve the initial coulombic efficiency and cycle stability of the battery, and is suitable for high-energy density lithium ion batteries.

The invention belongs to the technical field of lithium supplementation agents, and particularly discloses a composite lithium supplementation agent and a preparation method and application thereof. The preparation method comprises the following steps: firstly, carrying out high-energy ball milling and mixing on a conductive agent 1, a lithium source, an oxalate-containing compound and a conductive agent 2, and carrying out thermal initiation reaction to obtain an organic lithium supplement agent A; then mixing the organic lithium supplement agent A with the inorganic lithium supplement agent B to obtain a composite lithium supplement agent; and the inorganic lithium supplement agent B is a ternary lithium-containing compound. According to the invention, advantages and disadvantages of the inorganic lithium supplement agent and the organic lithium supplement agent are complemented, the decomposition voltage of the organic lithium supplement agent is reduced, efficient lithium supplement is realized, the decomposed product is utilized to stabilize the inorganic lithium supplement agent, i.e., the crystal structure of the ternary lithium-containing compound, and subsequent side reactions are inhibited; therefore, the overall high-energy density and long-cycle stability of the battery cell are realized.

The invention provides a preparation method of a silicon-carbon lithium ion battery and lithium compound solid-state lithium battery, and belongs to the technical field of new energy lithium battery preparation. Aiming at the problems of low energy density, short cycle life and easy thermal runaway of a conventional lithium ion battery and capacity loss caused by cyclic pulverization of a silicon material, the method comprises the following steps: adding 1-80% of silicon powder into a negative electrode base material to improve the energy density of a negative electrode, and spraying 0.1-800% of a lithium compound on a negative electrode plate to supplement cyclic lithium loss. And a solid gel electrolyte (low-temperature injection, normal-temperature infiltration and high-temperature curing) is matched to coat the pole piece. The prepared battery has significantly improved capacity and cycle life, can inhibit short-circuit thermal runaway, has high safety, and is suitable for new energy automobile power batteries, energy storage equipment and other scenes.

The present invention relates to an apparatus for manufacturing lithium chloride and a method for manufacturing the same, and the apparatus for manufacturing lithium chloride includes: a hopper for supplying a lithium compound and a reducing agent; a selective chlorinator connected to a lower part of the hopper to receive chloride and induce a chlorination reaction; and an extractor connected to the top of the selective chlorinator to extract lithium chloride produced by the chlorination reaction, wherein the amount of residual Li in the lithium compound can be 15 wt% or less.

The present invention relates to a method for producing a lithium metal dispersion that can be used to produce solutions of alkyllithium compounds. More specifically, the present invention relates to a method for producing a dispersion of lithium metal in an organic solvent by melting lithium metal and dispersing the molten lithium metal with stirring in an organic solvent having a boiling point of up to 120°C, followed by cooling to produce a dispersion of lithium metal in the organic solvent. The present invention further relates to a dispersion of lithium metal in an organic solvent having a boiling point of up to 120°C, wherein the lithium metal particles have a particle size greater than 300 microns, and to a method for producing an alkyllithium solution using the lithium metal dispersion.

An alkali-metal removal system and method for in-situ vapor phase removal and downstream reclamation of metallic lithium from reusable lithium deposition process kit parts are provided. The system and method include preparing a cleaning gas containing vapor phase fluorinated alcohol. The system and method further include exposing parasitic lithium deposits to the cleaning gas containing the vapor phase fluorinated alcohol and etching metallic lithium from parts coated with parasitic lithium deposition. The system and method further include collecting reaction byproducts and unreacted cleaning gas. The system and method further include separating lithium compounds from the reusable cleaning gas.

The invention relates to a method for producing copolymers by solution polymerization based on at least 1, 3-butadiene and at least one hydrocarbon which is different from 1, 3-butadiene and contains at least one olefinic double bond as monomers, using one or more organolithium compounds as initiators, wherein the polymerization is carried out at a temperature of the reaction mixture of 0 DEG C to 50 DEG C and a pressure of 0.2 MPa to 0.6 MPa, and wherein 55% to 65% by weight, based on the total mass of monomers, of 1, 3-butadiene is added to the reaction mixture; a copolymer comprising units derived from 1, 3-butadiene and units derived from, as monomers, at least one hydrocarbon different from 1, 3-butadiene and comprising at least one olefinic double bond wherein the copolymer comprises monomer units derived from 1, 3-butadiene of formulae (A), (B) and (C) wherein all of the units derived from 1, 3-butadiene present in the copolymer are units derived from 1, 3-butadiene of formula (A), (B) and (C). The proportion of (A) is at least 80 mol% among monomeric units derived from 1, 3-butadiene present in the polybutadiene, and wherein the sum of the proportions of (B) and (C) is not more than 20 mol% among all monomeric units derived from 1, 3-butadiene present in the polybutadiene, and wherein the copolymer has a number average molecular weight Mn of from 2,000 g / mol to 5,400 g / mol and a glass transition temperature TG of from-15 DEG C to 5 DEG C; and to the use of the copolymers according to the invention as reactive cross-linking agents.

The invention relates to the technical field of batteries, in particular to a negative electrode material and a preparation method thereof, a negative electrode plate, a battery and an electric device. The preparation method of the negative electrode material comprises the following steps: mixing a first inorganic salt compound and a second inorganic salt compound, and adding the mixture into a first solvent to form a salt solution; adding the etched graphite into a salt solution, mixing, and drying to obtain an intermediate material; the first inorganic salt compound comprises a molybdenum compound; mixing alkali, a first binder and the intermediate material, and carrying out first sintering to obtain porous graphite; and mixing a lithium compound, a second binder and silane, adding the mixture into a second solvent to form a mixed solution, dispersing the porous graphite into the mixed solution, and carrying out second sintering to obtain the negative electrode material. According to the negative electrode material obtained through the method, the specific capacity and the diffusion coefficient of the negative electrode material are effectively improved, and the cycle rate performance is well improved.

This invention provides functional materials for secondary batteries, methods for preparing them, and their applications. [Solution] The functional material for secondary batteries comprises a carrier material and an active material. The carrier material is a porous material that catalytically acts on the active material under a voltage of 2.0V to 4.8V. The carrier material includes one or more of the following: porous metal material, porous ceramic material, porous carbon material, porous plastic, and molecular sieve. The active material includes a lithium-containing compound or a sodium-containing compound. The active material is uniformly distributed in the form of fine particles within the pores or on the surface of the carrier material. The particle size Dv50 of the active material particles is 0.1nm to 10μm, and the particle size Dv50 of the carrier material particles is 1nm to 100μm. When this functional material for secondary batteries is applied to a secondary battery, it is possible to replenish the irreversible active ions consumed during the charge-discharge cycle of the secondary battery, thereby giving the secondary battery the advantages of high capacity and long cycle life.

This invention provides a method for producing a lithium-metal composite oxide using a two-stage firing process comprising a preliminary firing step for heating a precursor compound of a lithium-metal composite oxide and a lithium compound at a temperature of 500ºC to 650ºC to obtain a preliminary fired product; a pelletizing step for producing a pellet of the preliminary fired product; and a firing step for firing the pellet at a temperature of 700ºC to 1000ºC, such method is capable of minimizing the difference between a raw material metal ratio and the metal composition in a lithium-metal composite oxide, which occurs as a result of lithium element volatilization, and minimizing corrosion of a furnace body by lithium hydroxide.

Protected lithium electrode structure (1) for a lithium-air battery, comprising: a negative electrode current collector (3); a negative electrode active material layer (5) made of a lithium metal, a mainly lithium-containing alloy or a mainly lithium-containing compound, and stacked on the negative electrode current collector (3); and a separator (7) which is stacked on the negative electrode active material layer (5), wherein the negative electrode active material layer (5) is sealed by connecting the separator (7) and the negative electrode current collector (3) around the negative electrode active material layer (5), the separator (7) being bonded to the negative electrode current collector (3) at a circumferential edge section of the separator (7), and the negative electrode active material layer (5) being stacked onto a surface of the negative electrode current collector (3) to cover an area smaller than the area of ​​the negative electrode current collector (3), and a trapping layer (11) for finely powdered lithium, which is arranged between the negative electrode active material layer (5) and the separator (7) and has electrical conductivity via a bond on one side of the trapping layer (11) for finely powdered lithium, wherein the trapping layer (11) for finely powdered lithium is a conductive foam or a structure made of metal fiber and traps finely powdered lithium metal that is generated during charging and discharging.

The invention relates to the technical field of secondary batteries, in particular to an electrolyte additive, an electrolyte, a battery and an electric device. The electrolyte additive provided by the invention comprises one or more of a structural compound as shown in a formula (I), a lithium-containing compound and a fluorine-containing compound, the lithium-containing compound comprises one or more of lithium sulfonate; r2 is alkyl with the carbon atom number of 1 to 3, aryl with the carbon atom number of 6 to 12 or-COOLi; the fluorine-containing compound comprises one or more of compounds with a structure as shown in a formula (II). The electrolyte additive provided by the invention can construct a stable interface and inhibit dissolution of manganese in lithium manganese iron phosphate, has good compatibility with a solid electrolyte and other components, is adaptive to a high-voltage system, and further can improve the charge-discharge capacity and rate capability of a battery.

This invention discloses a preform for the hot top of a crystallizer specifically for semi-continuous casting of aluminum-lithium alloys and its manufacturing method. Addressing the problems of severe interfacial reactions between existing refractory materials and molten aluminum-lithium alloys, resulting in poor forming quality of semi-continuous casting ingots, this invention employs a gradient composite structure design: lithium aluminate is introduced into the working layer to thermodynamically suppress interfacial reactions by increasing the intrinsic lithium chemical sites; the insulation layer contains β-lithium nepheline and lithium aluminate to improve the insulation performance and thermal shock resistance of the hot top. Furthermore, by using a gradient distribution of lithium compound concentrations and types, combined with a multi-stage sintering process, the interlayer bonding strength is improved. Results show that this invention not only significantly reduces the interfacial reaction between the molten aluminum-lithium alloy and the hot top during semi-continuous casting, improving the forming quality of aluminum-lithium alloy ingots, but also extends the service life of the preform.

A resin composition which contains at least one compound selected from the group consisting of a titanium compound, a magnesium compound and a lithium compound, and an epoxy resin or a precursor thereof, and which is used for coating a sliding surface of a brake rotor.

The invention belongs to the technical field of lithium batteries, and particularly relates to a silicon-carbon composite negative electrode material protected by an interface lithium conducting layer and a preparation method of the silicon-carbon composite negative electrode material. The silicon-carbon composite negative electrode material comprises a silicon-carbon inner core and an interface lithium-conducting sub-layer, the inner core is composed of a porous carbon base material and nano silicon, and the interface lithium-conducting sub-layer contains a lithium-conducting compound. The continuous interface lithium conducting layer is constructed on the silicon carbon surface in situ, so that the interface lithium ion transmission kinetics of the silicon carbon material is remarkably improved, and meanwhile, the interface layer can be used as a rigid mechanical protection layer, so that the mechanical stability of the interface lithium conducting layer is favorably maintained, and the volume expansion of the silicon carbon is favorably inhibited; therefore, the rate capability and the cycling stability of the lithium ion battery using the silicon-carbon material are remarkably improved; and meanwhile, the interface lithium conducting layer is beneficial to avoiding direct contact between silicon carbon and a solid electrolyte and avoiding side reaction, so that the cycling stability of a solid-state battery using the material is improved.

This invention relates to the field of battery technology, specifically to a composite negative electrode current collector, its preparation method, and its application. The composite negative electrode current collector of this invention includes a polymer material layer, a lithium replenishment layer, and a conductive metal layer. The lithium replenishment layer is located on at least one surface of the polymer material layer, and the conductive metal layer is located on the surface of the lithium replenishment layer away from the polymer material layer. The lithium replenishment layer includes a composite lithium material comprising a lithium metal core and a lithium compound coating layer covering the surface of the lithium metal core. The conductive metal layer has multiple through-hole structures. The composite negative electrode current collector of this invention, through the coordination of its various layer structures, is beneficial for improving the storage performance of the negative electrode, reducing battery impedance, shortening the electrolyte wetting time, enhancing lithium replenishment capacity, preventing the formation of lithium dendrites, and improving battery safety performance.

The invention relates to the field of lithium ion battery materials, and discloses a positive electrode material, a preparation method thereof and a lithium ion battery. The positive electrode material comprises a nickel-rich inner core, and a low-nickel shell layer, a cobalt-lithium compound layer and an outer layer which are coated outside the nickel-rich inner core and are sequentially distributed from inside to outside, the nickel-rich inner core contains Ni, an optional matrix element M and an optional doping element D; the low-nickel shell layer contains Ni, a matrix element Z and an optional doping element E; the cobalt-lithium compound layer contains Li, Co and an optional doping element G; the outer layer is selected from at least one of oxides, hydroxides, Li-containing compounds and phosphates; the weight ratio of the nickel-rich inner core to the low-nickel shell layer to the cobalt-lithium compound layer to the outer layer is 100: (1-20): (0.5-7): (0.05-4); and Li accounts for 6.8-7.8% of the weight of the positive electrode material. The positive electrode material has high capacity and high-rate discharge performance while having excellent cycle performance.

The invention provides a lithium source eutectic mixture, a positive electrode material, preparation methods of the lithium source eutectic mixture and the positive electrode material, a positive electrode plate and a lithium ion battery. The lithium source eutectic mixture comprises a first lithium compound and a second lithium compound, wherein the melting point of the first lithium compound is smaller than that of the second lithium compound; according to the embodiment of the invention, the second lithium compound with a lower melting point is added into the first lithium compound, and compared with a single lithium compound, the lithium source eutectic mixture reduces the melting point of the lithium source phase, so that a liquid phase is rapidly generated during sintering, and rapid diffusion of lithium ions is accelerated; moreover, the liquid phase is beneficial to wrapping other components, promoting the uniformity of the reaction and improving the compactness of the lithium source eutectic mixture, so that the sintering temperature is reduced, and the influence on the electrical property of the positive electrode material is reduced.