254 results about "Lithium compound" patented technology

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.

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.

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 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.

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.

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.

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 application discloses a full solid battery and a preparation method thereof, and a battery module. The full solid battery comprises a positive electrode sheet, a negative electrode sheet and a sulfide solid electrolyte layer between the positive electrode sheet and the negative electrode sheet which are arranged in a stack; the positive electrode sheet comprises a positive electrode current collector and a composite positive electrode layer on at least one side of the positive electrode current collector; wherein the composite positive electrode layer comprises a high-voltage oxide positive electrode main material, an oxide solid electrolyte, a conductive oxide and a sintering aid; the particles of the high-voltage oxide positive electrode main material, the oxide solid electrolyte and the conductive oxide are combined through sintering necks based on the sintering aid; the sintering aid comprises at least one of a metal element, an inorganic oxide, a metal fluoride, a metal nitride and a lithium-containing compound; the problems of poor physical contact and unstable chemical interface between the oxide positive electrode and the sulfide solid electrolyte are solved, and the safety performance of the battery is greatly increased.

The present specification relates to a cathode active material, and a cathode and a lithium secondary battery comprising same, the cathode active material comprising a lithium manganese iron phosphate-based compound, wherein the value calculated in mathematical formula 1 is 60 or less, and the average grain size of the lithium manganese iron phosphate-based compound is 135 nm or less.

A method for producing a lithium-transition metal composite oxide, including steps of preparing a mixture including a lithium-containing compound and a transition metal compound; obtaining a molded body of the mixture; and sintering the molded bodies in a container having at least one vent hole, to obtain sintered bodies.

The application discloses a polyarylether sulfone composite diaphragm, a preparation method thereof, an electrochemical device and an electric device. The polyarylether sulfone composite diaphragm comprises a base film and a composite coating arranged on at least one side of the base film, and the composite coating comprises polyarylether sulfone, a binder and an alkali metal ion compound. The polyarylether sulfone composite diaphragm of the embodiment of the application can improve the thermal dimensional stability of the polyolefin diaphragm by arranging the composite coating comprising polyarylether sulfone, a binder and a lithium-containing compound on at least one side of the base film, improve the affinity of the polyarylether sulfone composite diaphragm and the electrolyte by using the amorphous structure and the gel state of the electrolyte, and improve the cation transport capacity of the composite coating by using the alkali metal ion compound, thereby improving the ion transference number and the ionic conductivity.

The invention relates to the technical field of preparation of lithium ion battery positive electrode materials, in particular to an in-situ composite perovskite positive electrode active material and a preparation method and application thereof. The preparation method of the in-situ composite perovskite positive electrode active material comprises the following steps: mixing a lithium compound, a phosphate compound, a carbon source, a rare earth metal compound, a cobalt compound and / or a nickel compound with an iron compound or an iron compound and a manganese compound in a solvent to obtain mixed slurry; carrying out spray drying on the mixed slurry to obtain composite precursor powder; and sequentially carrying out pre-sintering treatment and formal sintering treatment on the composite precursor powder to prepare the in-situ composite perovskite positive electrode active material. Through the solution mixing and co-sintering process, the in-situ compounding of the perovskite phase and the positive electrode base material at the atomic scale is realized, the interface bonding and ion transmission efficiency between the perovskite phase and the positive electrode base material are remarkably enhanced, and the cycling stability is remarkably improved while the high capacity of the obtained positive electrode active material is maintained.

The invention relates to the technical field of lithium compound production, in particular to a continuous production device for preparing lithium carbonate through lithium hydroxide carbonization reaction and a working method thereof.The continuous production device comprises a lithium hydroxide slurry blending tank, a main reactor, an aging tank, a centrifugal machine and a drying device which are sequentially connected through pipelines and pumps; the drying device at least comprises a pre-carbonization tower and a deep carbonization tower, and the drying device comprises a pre-pre-drying mechanism, a main drying mechanism and a final drying mechanism; the drying efficiency is high, the adaptability is high, the three-stage sectional design is adopted, optimization treatment is carried out according to different characteristics of materials under different water contents, especially air arrow impact and fall crushing in the pre-drying stage, high-humidity and easily-caked initial materials can be efficiently treated, and the problems that traditional equipment is prone to material blockage and uneven in drying are solved.

The application discloses a negative electrode-free solid-state lithium metal battery cell with multiple interface film layers and a preparation method. The battery cell includes a first state and a second state; in the first state, the negative electrode tab includes a negative electrode current collector and an artificial interface modification layer, the artificial interface modification layer includes a lithiumophilic metal layer, a lithiumophilic metal compound layer located on the side of the lithiumophilic metal layer away from the negative electrode current collector, and an inorganic lithium ion conductor layer located on the side of the lithiumophilic metal compound layer away from the negative electrode current collector; in the second state, the negative electrode tab includes a negative electrode current collector and an interface layer, the interface layer includes a Li-M alloy layer, a Li-M alloy-lithium-containing compound layer located on the side of the Li-M alloy layer away from the negative electrode current collector, and an inorganic lithium ion conductor layer located on the side of the Li-M alloy-lithium-containing compound layer away from the negative electrode current collector; wherein M is a lithiumophilic metal. The battery cell can inhibit lithium dendrite growth and interface side reactions and reduce interface impedance, and has good cycle performance and safety performance.

The invention discloses a nickel-manganese spinel positive electrode material, a preparation method and a secondary battery, the nickel-manganese spinel positive electrode material comprises a matrix and a coating layer, the matrix is doped with a first element, the coating layer is doped with a second element, and the ion radius of the second element is greater than that of the first element. The nickel-manganese spinel positive electrode material is subjected to surface synergistic modification by adopting a method of combining elements with different ion radiuses, the first element with the smaller ion radius forms gradient doping or uniform doping in a matrix, and the second element with the larger ion radius is reserved on the near surface and forms a lithium-containing compound with a lithium source on the surface; and the construction of a stable interface coating layer is facilitated. Through doping and coating, the coordination of high capacity, high first efficiency and high cycle retention rate is realized, and the application is favorable for adapting to scenes with strict requirements on cycle stability.

The invention discloses a coated sulfide solid electrolyte and a preparation method thereof, and the preparation method comprises the steps: mixing a sulfide electrolyte and a sanding solvent, and then carrying out sanding treatment to obtain sulfide electrolyte slurry; the sanding solvent is an ester compound; filtering the sulfide electrolyte slurry to obtain a sulfide electrolyte wet material; and mixing the sulfide electrolyte wet material with an organic lithium compound, and drying to obtain the coated sulfide solid electrolyte. According to the invention, the organic lithium compound is mixed with the sulfide electrolyte wet material subjected to sanding treatment, so that the organic lithium compound reacts with the residual sanding solvent in the sulfide electrolyte wet material to generate a new organic lithium compound; and the newly generated organic lithium compound is uniformly coated on the surfaces of sulfide electrolyte particles to form an in-situ coating layer, so that the air stability and the structural stability of the material are improved.

The invention discloses a pre-lithiated graphite composite material and a preparation method thereof, a pre-lithiated silicon-carbon composite material, a pole piece and a lithium ion battery. The pre-lithiated graphite composite material comprises graphite and a lithium-containing composite material, the lithium-containing composite material comprises a lithium-containing substance and a porous carbon coating layer arranged on the surface of the lithium-containing substance, the lithium-containing composite material is dispersed in the graphite, and at least part of the lithium-containing composite material and at least part of the graphite are connected together through an amorphous carbon skeleton; the lithium-containing substance comprises a lithium elementary substance and / or a lithium-containing compound. The lithium ion battery obtained by taking the pre-lithiated silicon-carbon composite material obtained from the pre-lithiated graphite composite material as a negative electrode material has excellent cycling stability, capacity performance and first effect, and is excellent in safety performance.

The invention provides a positive active material, a preparation method, a positive plate, a battery, a battery pack and electric equipment. The positive electrode active material comprises an inner core and a coating layer coating at least part of the surface of the inner core, in the direction away from the inner core, the coating layer comprises a first coating layer and a second coating layer which are stacked, the first coating layer comprises an active lithium salt, the second coating layer comprises a lithium-containing compound, and the porosity of the second coating layer is not higher than 5%; anions of the active lithium salt comprise inorganic acid radical ions and / or organic acid radical ions, and pKa of acid formed by the inorganic acid radical ions is not higher than 6. The positive electrode active material is composed of a special coating layer, so that the positive electrode active material has a higher first effect and a lower expansion rate, and the cycle performance, the safety performance and the energy density of the battery can be improved.

A method for preparing a telechelic polymer, the method comprising (i) providing a dilithium initiator prepared by reacting dialkenyl compound with an alkyl lithium compound; (ii) combining the dilithium initiator and conjugated diene monomer to form a reactive difunctional diene oligomer; (iii) introducing the difunctional diene oligomer and additional diene monomer; (iv) allowing the additional diene monomer to polymerize and form a polymer having first and second reactive ends; and (v) reacting the first and second reactive ends with a functionalizing agent to thereby form a telechelic diene polymer.

Provided is a method for producing a lithium transition metal composite oxide that uses a positive electrode recovered from a used lithium-ion battery.　The method for producing a lithium transition metal composite oxide includes the following steps. (1) A step for preparing a positive electrode recovered from a used lithium-ion battery, (2) a step for heating the positive electrode in a temperature range exceeding the thermal decomposition start temperature of a binder, (3) a step for removing a current collector from the heated positive electrode and recovering a positive electrode mixture, (4) a step for recovering a lithium transition metal composite oxide from the recovered positive electrode mixture, (5) a step for washing the recovered lithium transition metal composite oxide, (6) a step for kneading the washed lithium transition metal composite oxide and a lithium compound, (7) a step for calcining the kneaded material under prescribed conditions, and (8) a step for cooling the calcined lithium transition metal composite oxide.

A lithium recovery method from a used lithium-ion secondary battery including an electrode body having a positive electrode, a sulfide solid electrolyte, and a negative electrode, the method including: dissolving a solid electrolyte and a lithium compound contained in a deactivated lithium-ion secondary battery in pure water to obtain a dispersion liquid; recovering a separation solution by performing solid-liquid separation on the dispersion liquid; performing an oxidation treatment on the separation solution to generate an acidic component in the separation solution and adjusting a pH of the separation solution; recovering a recovery stock solution by performing solid-liquid separation on the separation solution after the oxidation treatment; and extracting a lithium hydroxide aqueous solution from the recovery stock solution through electrodialysis using a cation exchange membrane.

A process for preparing composite particles comprises depositing silicon in the pores of the porous particles to form silicon-containing composite particles and contacting the silicon-containing compo

This application discloses a positive electrode material and its preparation method, a positive electrode sheet, a battery, and an electrical device. The positive electrode material includes a positive electrode active material, a one-dimensional conductive material distributed on the surface of the positive electrode active material, and an additive. At least a portion of the one-dimensional conductive material is encapsulated by the additive, which contains a reducing chalcogenide element. This application introduces an additive containing a reducing chalcogenide element onto the surface of the positive electrode active material. This additive effectively removes residual lithium compounds from the surface of the positive electrode active material. Simultaneously, a one-dimensional conductive material is introduced onto the surface of the positive electrode active material, with at least a portion of the one-dimensional conductive material encapsulated by the additive. The one-dimensional conductive material acts as a carrier to anchor the additive, and it can also construct a three-dimensional conductive system, thereby improving the conductivity of the positive electrode material.

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.

A lithium-containing compound has the following parent formula: LiNaMg2Cl6 or LiNaMg3Cl8. In an embodiment, a lithium solid-state battery includes a cathode active material layer, an anode active material layer, and a solid electrolyte layer between the cathode active material layer and the anode active material layer, wherein the solid electrolyte layer includes the aforementioned lithium-containing compound. In an embodiment, the battery includes the aforementioned lithium-containing compound as a catholyte or as a coating for a cathode active material. In an embodiment, the anode active material layer is an alloy anode and the battery includes the aforementioned lithium-containing compound as an anolyte.

To provide a coating liquid for a positive electrode active material capable of suppressing elution of lithium contained in the positive electrode active material into the coating liquid and constituting an all-solid-state lithium ion secondary battery having stable battery performance, and to provide a method of manufacturing a positive electrode active material with a coating film.SOLUTION: A coating liquid for a positive electrode active material, which is used for forming a coating film made of a composite compound of lithium and tungsten on a positive electrode active material containing lithium, includes an aqueous solution containing a lithium compound and a tungsten compound, and has a lithium concentration in a range of more than 3. 0mol / L and 5. 3mol / L or less. A method for producing a positive electrode active material with a coating film having a coating film composed of a composite compound of lithium and tungsten on a surface of a positive electrode active material containing lithium includes attaching the above-described coating liquid for a positive electrode active material to the surface of the positive electrode active material, followed by drying.SELECTED DRAWING: None

Provided is a method for producing a lithium transition metal composite oxide using a positive electrode recovered from a used lithium-ion battery.　The method for producing a lithium transition metal composite oxide includes the following steps. (1) A step for preparing a positive electrode recovered from a used lithium-ion battery. (2) A step for treating the positive electrode with radicals. (3) A step for removing a collector from the treated positive electrode and recovering a positive electrode mixture. (4) A step for recovering a lithium transition metal composite oxide from the recovered positive electrode mixture. (5) A step for washing the recovered lithium transition metal composite oxide. (6) A step for kneading the washed lithium transition metal composite oxide and a lithium compound. (7) A step for calcining the kneaded substance under prescribed conditions. (8) A step for cooling the calcined lithium transition metal composite oxide.