606 results about "Lithium compound" patented technology

The invention discloses a lithium supplement additive and a preparation method and application thereof. The lithium supplement additive comprises a lithium sulfinate compound, and the lithium sulfinate compound contains an electron withdrawing group. An electron withdrawing group contained in the lithium sulfinate compound in the lithium supplement additive can effectively change electron cloud distribution around sulfur atoms, so that the lithium sulfinate compound is endowed with relatively high lithium supplement capacity; meanwhile, due to the existence of the electron withdrawing group, the electron energy of the lowest unoccupied molecular orbital (LUMO) of the lithium sulfinate compound is reduced, and the energy gap between the highest occupied molecular orbital (HOMO) and the LUMO of the lithium sulfinate compound is reduced, so that the lithium supplement additive can be arranged in an electrode plate to exert the lithium supplement capacity and also can be used as an electrolyte additive; and the material can participate in electrode / electrolyte interface formation.

The invention relates to a modified current collector for a cathode-free metal battery and a preparation method and application thereof.The preparation method comprises the steps that an in-situ modification reaction is conducted on the surface of a copper current collector to obtain a current collector coated with a copper oxide nanometer material, and then selenium is introduced to the surface of the current collector coated with the copper oxide nanometer material through a partial in-situ substitution reaction to obtain the modified current collector coated with the copper oxide nanometer material. The preparation method comprises the following steps: preparing a copper selenide and copper oxide composite modified current collector, performing in-situ lithiation reaction through electrochemical deposition, and partially converting to generate corresponding lithiates, thereby obtaining the modified current collector for the non-anode metal battery. According to the invention, the functional artificial interface layer with lithium affinity, high stability and high ionic conductivity is constructed on the surface of the copper-based current collector in situ, so that the key problems of uneven metal deposition and unstable SEI layer on the surface of the negative electrode current collector in the current research of the metal secondary battery without the negative electrode are solved, the formation of dendritic crystals and the occurrence of side reactions are inhibited, and the service life of the metal secondary battery is prolonged. Therefore, the coulombic efficiency, the safety and the cycle life of the battery are improved.

A method including pretreating ground lithium-containing ceramics to form alkali coated ceramics, leaching the alkali coated ceramics to form a leachate comprising a filtrate and a solid residue, preferentially extracting lithium from the filtrate to form a lithium rich solution and a raffinate, precipitating a crude lithium carbonate from the lithium rich solution and purifying the crude lithium carbonate to produce a battery grade lithium carbonate. A method including leaching a slurry comprising lithium-containing ceramics, water, a strong base, and an alkaline earth metal oxide / hydroxide at a pressure ranging from 0 to 1450 psi and at a temperature ranging from 100 to 500°C to form a leached slurry comprising a liquid filtrate and a solid residue, processing the liquid filtrate to recover a lithium-rich organic solution, and processing the lithium-rich organic solution to produce a battery-grade lithium compound and sodium sulfate.

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 discloses a porous carbon-coated graphite composite material for an energy storage battery and a preparation method of the porous carbon-coated graphite composite material. The porous carbon-coated graphite composite material consists of inner core graphite and lithium heteroatom-doped porous carbon coated on the surface of the inner core graphite, the preparation method comprises the following steps: preparing an organic template agent solution, adding resin and an amino organic lithium compound, uniformly mixing, adding a hydrogen peroxide oxidizing agent, reacting, filtering, and activating at high temperature to obtain lithium-doped porous carbon; the preparation method comprises the following steps: adding lithium-doped porous carbon into an organic solvent, then adding graphite and an organic aluminum-based compound, uniformly dispersing, dropwise adding an amino solution, carrying out chemical reaction at the temperature of 50-120 DEG C, filtering, and carrying out vacuum drying and high-temperature carbonization on obtained filter residues to obtain the lithium-doped porous carbon composite material. The cycle performance and the storage performance of the graphite can be 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.

A coated cathode material for lithium-ion batteries is disclosed. Methods and systems are further provided for applying a coating to an active cathode material for use in a lithium-ion battery. In one example, the coated cathode material may include a high-nickel content active cathode material, such as lithium nickel manganese cobalt oxide or lithium nickel aluminum cobalt oxide, coated with a coating including one or more high energy density active materials, such as lithium vanadium fluorophosphate and / or a lithium iron manganese phosphate compound. In some examples, the high-nickel content active cathode material may include greater than or equal to 60% nickel content.

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 method for preparing a battery-grade lithium compound. The method comprises the following steps: S1, carrying out sulfuric acid acidification reaction on a lithium-containing raw material or roasting by adding sulfate, and carrying out water leaching to obtain leached slurry; the lithium-containing raw material is a lithium mineral or a waste lithium battery material; s2, calcium oxide or calcium hydroxide is added into the leaching slurry, filtering is performed after full reaction, filtrate A and filter residues A are obtained, the main component of the filtrate A is lithium hydroxide, and the filtrate A further comprises soluble impurities formed after water leaching; s3, adding a substance for removing calcium ions into the filtrate A, fully reacting, and filtering to obtain filtrate B and filter residues B; s4, fully contacting the filtrate B with an extracting agent for extraction, and then separating to obtain a loaded organic phase and raffinate; s5, reversely extracting the loaded organic phase to obtain a lithium solution and a blank organic phase; and S6, further treating the lithium solution to obtain the battery-grade lithium compound. Sodium ions are basically not introduced, the energy consumption is low, the process is simplified, the product quality is high, the production cost is low, the lithium yield is high, and byproducts are convenient to treat.

The invention belongs to the technical field of battery materials, and provides a sulfide solid electrolyte composite material, a structural energy storage integrated lithium ion battery and a preparation method thereof. The sulfide solid electrolyte composite material comprises an inner core and a coating layer, the surface of the inner core is coated with the coating layer, the inner core is a sulfide solid electrolyte, and the coating layer is an oxygen-containing lithium compound; the species of oxygen-containing lithium compounds are defined. The sulfide solid electrolyte is coated with at least two oxygen-containing lithium compounds, and the oxygen-containing lithium compounds are compatible with the sulfide solid electrolyte in the heat treatment process, so that the air stability and the oxidation resistance of the electrolyte are remarkably improved; a solution method coating and calcining process is adopted, so that a coating layer is uniformly dispersed, and the stability of the composite material is improved; the sulfide solid electrolyte composite material, a carbon fiber electrode and a glass fiber woven cloth diaphragm are assembled into the structural energy storage integrated lithium ion battery, the lithium ion battery has excellent specific capacity, cycling stability and rate capability, and the service life is prolonged.

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.

The invention discloses a resource recycling method of waste lithium iron phosphate batteries, which comprises the following steps: mixing lithium iron phosphate black powder and a chlorinating agent, and performing chlorination separation roasting to obtain roasted sand and flue gas; and the roasted product is subjected to leaching treatment, and flue gas is subjected to defluorination and dechlorination treatment through a semi-dry method. According to the recycling method, the chlorinating agent is introduced for chlorination separation roasting, phosphorus in lithium iron phosphate reacts with the chlorinating agent to generate a phosphorus-containing compound phase, high-temperature reduction conversion of iron is achieved through graphene / carbon black in the black powder, and a magnetite phase is formed; a phosphorus-containing compound phase and a magnetite phase generated in the chlorination segregation roasting process are subjected to high-temperature segregation, and lithium exists in the form of a lithium-containing compound. And the roasted sand and the flue gas are treated at the same time, so that various recycled products can be obtained, the emission of the flue gas is reduced, and the high-value recycling purpose is achieved.

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 relates to the technical field of negative-electrode-free lithium metal batteries, in particular to a three-dimensional copper-based composite current collector and a preparation method thereof. The preparation method comprises the following steps that pretreated foamy copper is subjected to thermal oxidation treatment, and oxidized foamy copper with a three-dimensional copper-based framework is prepared; the oxidized foamy copper is subjected to electro-deposition treatment, the oxidized foamy copper is modified through a lithium-containing compound, an SEI film containing C, O, F, N and Li is formed on the three-dimensional copper-based framework, and the three-dimensional copper-based composite current collector is prepared. Lithium-loving sites formed in the lithium electrodeposition process can induce lithium metal in-situ nucleation, the chemical stability of a lithium metal negative electrode / electrolyte interface is improved by utilizing electrolyte induction of an in-situ matching battery system and pre-regulation and control of interface components, and meanwhile, an SEI film rich in inorganic components is formed, so that growth of lithium dendrites is inhibited, the electrochemical performance is improved, and the electrochemical performance is improved. The technical problem that an existing copper negative electrode current collector is difficult to form a stable SEI film is solved.

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 positive lithium supplement agent, a positive plate, a battery, a battery pack and electric equipment. The positive electrode lithium supplementing agent comprises a lithium-rich compound inner core and a conductive carbon layer coating at least part of the surface of the lithium-rich compound inner core, an intercalation compound with a hydrogen insertion function is embedded in the conductive carbon layer. The positive electrode lithium supplement agent provided by the invention can effectively supplement lithium and reduce gas generated by battery storage at the same time.

The present invention provides a vapor deposition method for preparing an amorphous lithium borosilicate or doped lithium borosilicate compound, the method comprising: providing a vapor source of each constituent element of the compound, wherein the vapor source comprises at least a lithium source, an oxygen source, a boron source, and a silicon source, and optionally a source of at least one dopant element; conveying streams of the lithium, the oxygen, the boron, and the silicon, and optionally the dopant element; and co-depositing the constituent elements from the vapor source on a substrate, wherein the constituent elements react on the substrate to form an amorphous compound; wherein the amorphous lithium borosilicate or doped lithium borosilicate compound has a lithium content in the range of 40 - 65 atomic %, based on the atomic percentage of the combination of lithium, boron, and silicon.

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.

A negative electrode active material, a negative electrode including the same, a secondary battery including the same and a method for preparing a negative electrode active material are provided. The negative electrode active material comprises silicon-based particles comprising SiOx (0<x<2) and a lithium (Li) compound; a carbon layer provided on at least a part of a surface of the silicon-based particles; lithium fluoride (LiF); and carbon fluoride (CFa, 0<a<4), wherein a content (atomic percentage) of F is 10 at % or more and a content of Li is less than 10 at % according to a surface analysis of the negative electrode active material by X-ray photoelectron spectroscopy.

The present disclosure provides a composite negative electrode sheet and a use thereof in a solid-state battery. The composite negative electrode sheet comprises a silicon active material and a metal compound, and in the process of silicon lithiation, a ternary Zintl phase Li-M-Si and an ionic conductive phase lithium compound are formed, wherein the mass ratio of the metal compound to the silicon active material is 5%-30%. According to the technical solution, by compounding the silicon active material with the metal compound, the ternary Zintl phase Li-M-Si can be formed in situ within a silicon-based negative electrode. The ternary Zintl phase has a stable structure, which can alleviate the volume expansion problem of silicon and enhance cycle stability. In addition, the lithium compound is formed to act as an ionic conductive phase, accelerating ion transport, enhancing lithium-ion transport kinetics, and improving the rate performance of batteries.

A method for electrochemically assisted green leaching of a decommissioned lithium ion battery belongs to the technical field of decommissioned lithium battery key metal recycling and decommissioned battery recovery, and specifically comprises the following steps: disassembling a decommissioned ternary lithium battery, taking out a positive electrode material, cleaning, drying and grinding the positive electrode material to obtain a positive electrode material; placing the mixture and a weak acid solution in a reaction container to form a leaching system; mounting an inert electrode in the reaction container, connecting an external direct-current power supply, and gradually adjusting the voltage according to the potential requirement of metal ion dissolution to respectively leach nickel ions, cobalt ions and manganese ions to obtain a multi-metal-containing pregnant solution; and adding a precipitant into the obtained solution for precipitation to generate lithium carbonate precipitate, filtering, washing, drying and recovering to obtain the high-purity lithium compound. According to the method, use of strong acid and complex chemical reagents is reduced, the complexity of waste liquid treatment is remarkably reduced, and efficient recovery of target metal is achieved by controlling the metal dissolution process step by step.

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.