5574 results about "Spray dried" patented technology

The present invention includes a spray drying disposable device for use in a spray drying system. The disposable has a spray drying head and a plasma drying chamber. The head has a spray dry nozzle assembly in fluid communication with the plasma source and the pressurized aerosol gas source. The pressurized gas flows in a vortex pattern that atomizes plasma droplets in the chamber. The head also includes a plenum has uniform air pressure of the drying gas. A baffle plate forms the floor of the plenum having drying gas jets that supply drying gas to the chamber. The atomized plasma droplets evaporate in the presence of the drying gas emitted from the jets to obtain dried plasma particles and humid air. A capture filter captures the dried plasma particles and allows the humid air to pass. The humid air passes through the gas outlet and the exhaust port.

According to the invention, there is provided a solid pharmaceutical composition formulation for nasal delivery of an opioid antagonist, comprising a pharmacologically-effective amount of an opioid antagonist and a pharmaceutically-acceptable carrier. The compositions are preferably in the form of a powder produced by spray-drying, which are subsequently loaded into single use nasal applicators. Preferred pharmaceutically-acceptable carriers in this regard include disaccharides (e.g. lactose or trehalose) and dextrins (e.g. cyclodextrins or maltodextrins), preferably spray-dried together in combination. Compositions may further comprise an alkyl saccharide, preferably a sucrose ester, such as sucrose monolaurate. The compositions and applicators may be employed in the treatment of opioid overdose in subjects.

The present invention is directed to a storage-stable formulation of long-chain RNA. In particular, the invention concerns a dry powder composition comprising a long-chain RNA molecule. The present invention is furthermore directed to methods for preparing a dry powder composition comprising a long-chain RNA molecule by spray-drying. The invention further concerns the use of such a dry powder composition comprising a long-chain RNA molecule in the preparation of pharmaceutical compositions and vaccines, to a method of treating or preventing a disorder or a disease, to first and second medical uses of such a dry powder composition comprising a long-chain RNA molecule and to kits, particularly to kits of parts, comprising such a dry powder composition comprising a long-chain RNA molecule.

The technology described herein is directed to spray-dried biotherapeutic matrix compositions comprising a bacterial preparation, which is formulated for administration by inhalation. Also described herein unit dosage forms of such spray-dried biotherapeutic matrix compositions, devices comprising such pharmaceutical compositions, methods of producing such pharmaceutical compositions, and methods of treating diseases, such as bronchopulmonary diseases, among others, using such spray-dried biotherapeutic matrix compositions.

The invention discloses a preparation method of a high-compaction-density lithium iron phosphate material, through grading of large and small particle lithium iron phosphate, optimization of a sintering process and reasonable selection of a carbon source and a titanium dopant, the compaction density and the electrochemical performance of the material are remarkably improved, and the preparation method specifically comprises the following steps: mixing iron phosphate, lithium carbonate, the carbon source and auxiliary materials; the preparation method comprises the following steps: carrying out coarse grinding and fine grinding, respectively preparing large-particle lithium iron phosphate and small-particle lithium iron phosphate (a material A and a material B) by adopting spray drying and high-temperature calcination processes, mixing the material A and the material B according to a ratio, adding auxiliary materials, grinding, further carrying out spray drying, calcining and crushing to obtain a final lithium iron phosphate product, and the maximum compaction density of the prepared material can reach 2.712 g / cm < 3 >. According to the present invention, the maximum 1C discharge specific capacity can achieve 140.5 mAh / g, the maximum 1C 3.2 V discharge platform retention rate is 91.4%, and the prepared lithium ion battery negative electrode material has characteristics of excellent conductivity, high discharge capacity and good cycle stability, and is suitable for power batteries and energy storage batteries.

Disclosed is a pharmaceutically-acceptable composition in the form of a solid, amorphous, mono-particulate powder comprising a mixture of:a pharmacologically-effective dosage amount of an adrenergic receptor modulator, or a pharmaceutically-acceptable salt thereof; anda pharmaceutically-acceptable carrier material, which carrier material comprises a maltodextrin with a dextrose equivalent (DE) that is above 15.Compositions are suitable for transmucosal drug delivery, including nasal delivery, by which said compositions may be loaded into a single-use nasal applicator. Compositions are preferably made by way of spray drying and may further include a disaccharide, such as lactose or trehalose which, along with the active ingredient and maltodextrin, may be spray-dried together in combination. Compositions may further comprise one or more alkyl saccharides. Preferred alkyl saccharides include sucrose esters, such as sucrose monolaurate. Preferred adrenergic receptor modulators include epinephrine (adrenaline). The compositions are thus particularly useful in the treatment of allergic reactions, including anaphylaxis.

The present invention includes a spray drying disposable device for use in a spray drying system. The disposable has a spray drying head and a plasma drying chamber. The head has a spray dry nozzle assembly in fluid communication with the plasma source and the pressurized aerosol gas source. The pressurized gas flows in a vortex pattern that atomizes plasma droplets in the chamber. The head also includes a plenum has uniform air pressure of the drying gas. A baffle plate forms the floor of the plenum having drying gas jets that supply drying gas to the chamber. The atomized plasma droplets evaporate in the presence of the drying gas emitted from the jets to obtain dried plasma particles and humid air. A capture filter captures the dried plasma particles and allows the humid air to pass. The humid air passes through the gas outlet and the exhaust port.

The present invention includes an ease-of-use system that allows the spray drying disposable device to fit (e.g., align) in both spray drying apparatus and the spray drying finishing apparatus to safely operate the system. The system includes locating arrangements between the spray drying disposable and the spray drying apparatus and / or spray drying finishing apparatus, a first retainer and second retainer, a shorter disposable device that allows for effective spray drying of plasma, a feedback indicators of correct installment, redundant indicators of correct installment, easily accessible operator controls and emergency shut offs.

The invention relates to the technical field of lithium iron phosphate production, and discloses a carbon-coated titanium-doped lithium iron phosphate positive electrode material and a preparation method thereof.The preparation method comprises the following steps that 1, a ferrous solution and a phosphorus source solution are mixed in proportion, dopamine hydrochloride is added, a pH regulator is dropwise added in the stirring state, the pH of the solution is adjusted to 4.0-5.5, a reaction is conducted, a titanium source solution is added, and a reaction solution is obtained; after uniformly stirring, continuously dropwise adding a pH regulator to regulate the pH value of the solution to 5.5-6.5; the iron phosphate octahydrate coated with the titanium-embedded polydopamine is obtained; 2) calcining the titanium-embedded polydopamine-coated ferrous phosphate octahydrate in an inert gas atmosphere to obtain carbon-coated titanium-doped anhydrous ferrous phosphate; 3) mixing the carbon-coated titanium-doped anhydrous ferrous phosphate with lithium phosphate and a carbon source, ball-milling, mixing, spray-drying and calcining to obtain a carbon-coated titanium-doped lithium iron phosphate positive electrode material; the synthesis process is simple, and energy consumption is reduced.

The invention relates to the technical field of microorganisms, and discloses a multifunctional compound probiotic composition which comprises the following raw materials in percentage by mass: 40-50% of probiotics; 30%-40% of a microcapsule embedding material; prebiotics: 10%-25%; 1%-5% of auxiliary materials; the invention also provides a preparation process of the multifunctional compound probiotic composition. The preparation process comprises the following steps: S1, culturing the probiotics and detecting the activity; s2, a microencapsulation process: preparing a multi-layer microcapsule through a spray drying method and an emulsion crosslinking method, and embedding the probiotics; and S3, mixing the microcapsules with prebiotics and auxiliary materials to obtain the multifunctional compound probiotic composition. By adopting a composite probiotic compatibility technology and through the synergistic effect of different strains, the stability and functionality of intestinal microecology are enhanced, and the effects of improving the survival rate of probiotics in gastrointestinal tracts, promoting planting of beneficial bacteria and enhancing the immunoregulation ability are achieved.

The invention provides spherical porous carbon as well as a preparation method and application thereof, and relates to the technical field of porous carbon materials. The preparation method provided by the invention comprises the following steps: carrying out spray drying on a phenolic resin solution in which lithiates and borides are dissolved to obtain resin microspheres; pre-oxidizing the resin microspheres at the temperature of 150-300 DEG C to obtain a carbon sphere precursor; carbonizing the carbon sphere precursor in an inert atmosphere at the temperature of 1000-1200 DEG C to obtain carbon microspheres; performing cyclic activation and pore forming on the carbon microspheres in an active atmosphere of 800-1000 DEG C to obtain porous microspheres; and reducing the porous microspheres in a reducing atmosphere of 400-600 DEG C to obtain the spherical porous carbon. The spherical porous carbon material with developed micropores and high specific surface area can be prepared, meanwhile, the coulombic efficiency is high, the conductivity is good, the used preparation method is simple and efficient, and large-scale industrial production is facilitated.

The invention provides a method for preparing high-purity and fine-particle-size lithium sulfide based on carbon thermal reduction. The method comprises the following steps: weighing lithium sulfate monohydrate, an insoluble inorganic carbon source and cysteine in a set proportion to form a raw material mixture; mixing the raw material mixture with water according to a set solid-to-liquid ratio, performing ultrasonic dispersion to obtain homogeneous dispersion liquid, and enabling the dispersion liquid to pass through a nitrogen circulating spray dryer to obtain uniform and dry precursor powder; in a vacuum environment, carrying out segmented calcination to obtain a crude product lithium sulfide; and in a dry and anhydrous environment, washing the crude product lithium sulfide for multiple times by using absolute ethyl alcohol according to a set liquid-solid ratio to obtain an alcoholic solution containing lithium sulfide, and then obtaining lithium sulfide fine powder through a nitrogen circulating spray dryer. The invention solves the problems of side reaction, low purity, large product particles, uncontrollable particle size and the like of lithium sulfide prepared by a carbon thermal reduction method in the prior art.

The present invention relates to spray drying plasma methodology that includes pretreating a donated liquid plasma unit, drying the liquid plasma using a spray drying apparatus with the spray drying disposable device that results in a disposable having the dried plasma, finishing the disposable using the finishing apparatus that is designed to seal and separate the disposable, and transform the disposable into a dried plasma unit. The methods of the present invention include storing the dried plasma unit and, when ready for use, reconstituting the dried plasma unit with reconstitution solution to obtain a plasma unit ready for transfusion into a recipient.

The invention discloses a spray drying device for boron carbide production, the spray drying device comprises a spray drying tower, a hot blast stove, a cyclone separator and a system controller, an atomizer and an online detection module are arranged in the spray drying tower, and the online detection module is used for monitoring temperature parameters in the spray drying process; comprising a first temperature sensor, a second temperature sensor and a temperature signal processing unit, the temperature signal processing unit adopts a multi-stage filtering and error compensation technology, noise and interference are effectively suppressed, and the accuracy of detection data is ensured. The air inlet temperature and the air outlet temperature are monitored in real time through the online detection module, the fuzzy-PID control algorithm is combined, the temperature control precision and the response speed are remarkably improved, and temperature fluctuation is reduced. The device dynamically adjusts the heating power of the hot blast stove according to real-time working conditions, the energy utilization efficiency is optimized, and the energy consumption is reduced.

The invention provides a lithium oxalate lithium supplement agent, a preparation method thereof and a lithium battery, and belongs to the technical field of lithium batteries. The lithium oxalate lithium supplement agent comprises lithium oxalate, a conductive agent and a catalyst, wherein the catalyst is nonmetal doped manganese dioxide. The lithium oxalate, the non-metal doped manganese dioxide and the conductive agent are mixed in water, and then spray drying is performed to obtain the lithium oxalate lithium supplement agent. The nonmetal doped manganese dioxide catalyst has a nano flower cluster shape and can be in close contact with lithium oxalate to form homogeneous microspheres, efficient solid-solid catalysis is promoted, the decomposition voltage of a lithium oxalate lithium supplement agent can be reduced to 4.25 V from 4.8 V, and meanwhile good integrity and wettability are kept.

The invention discloses a method for preparing a composite iron-based polyanion positive electrode material. The structural formula of the positive electrode material is represented as Na4Fe3 (PO4) 2 (P2O7) (at) Camp, mXenes are sodium ferric pyrophosphate compositely coated by an MXenes material and a carbonaceous precursor, and the preparation method comprises the following steps: weighing a sodium source, a ferrous source, a phosphorus source and a carbon source according to a stoichiometric ratio, uniformly mixing, grinding, spray-drying and sintering at high temperature to obtain the composite iron-based polyanion positive electrode material, and the carbon source comprises iron-nickel doped polyethylene glycol. The composite iron-based polyanion positive electrode material provided by the invention is remarkably improved in the aspects of energy density, rate capability and cycle life, and the preparation process is simple to operate, reliable in flow, quick in preparation process and easy for industrial production, so that an ideal scheme is provided for commercialized sodium ion battery positive electrode materials.

The invention belongs to the technical field of new energy, and discloses a preparation method and application of a LiaMXb-based composite solid electrolyte membrane, and the preparation method comprises the following steps: S1, carrying out spray drying on a mixed solution in which a Li source, an M source and an ammonium salt are dissolved, placing the mixed solution in a crucible of which the bottom is paved with the ammonium salt, and annealing for 2-10 hours at 350-800 DEG C in an inert atmosphere to obtain a LiaMXb solid electrolyte; s2, mixing the LiaMXb solid electrolyte with a fluorine-containing monomer A and a dispersing agent, and performing spray drying to obtain electrolyte powder wrapped by the fluorine-containing monomer A; s3, ball-milling and uniformly mixing the electrolyte powder wrapped by the fluorine-containing monomer A, a lithium salt, a thermal curing agent and a monomer B in an inert atmosphere to obtain composite electrolyte powder; and S4, carrying out cold isostatic pressing and hot pressing curing on the composite electrolyte powder to prepare the LiaMXb-based composite solid electrolyte membrane. The prepared LiaMXb-based composite solid electrolyte membrane not only has excellent air stability, flexibility and machinability, but also has a continuous three-dimensional ion conduction path, and the assembled all-solid-state lithium battery has good electrochemical performance.

The invention relates to the technical field of lithium ion battery materials, and provides a lithium iron phosphate positive electrode material, a preparation method thereof and a lithium battery. The preparation method of the lithium iron phosphate positive electrode material comprises the following steps: performing a first coprecipitation reaction on a first iron source solution and a first phosphorus source solution in the presence of a polymer monomer to obtain an iron phosphate seed crystal; performing a second coprecipitation reaction on the second iron source solution and the second phosphorus source solution in the presence of a polymer monomer and an iron phosphate seed crystal to obtain iron phosphate dihydrate; iron phosphate dihydrate, a lithium source and a carbon source are mixed and then subjected to spray drying, the mixture is placed in a rotary kiln to be sintered, carbon-coated lithium iron phosphate with the large particle size and carbon-coated lithium iron phosphate with the small particle size are prepared at different sintering temperatures respectively, and the carbon-coated lithium iron phosphate with the different particle sizes are mixed according to the mass ratio to obtain the lithium iron phosphate positive electrode material. The lithium iron phosphate positive electrode material has relatively good spherical morphology, so that the lithium iron phosphate positive electrode material has relatively high compaction density and electrical properties after grading.

The invention discloses a vanadium-doped modified ferric sodium pyrophosphate material based on spray drying as well as a preparation method and application of the vanadium-doped modified ferric sodium pyrophosphate material. The material has a spherical porous morphology, and the particle size is 1-10 microns; the chemical formula is Na (4-x) Fe (3-x) Vx (PO4) 2P2O7, wherein x is more than 0 and less than or equal to 0.1. The material is prepared by adopting a spray drying method, and atomic-scale mixing of vanadium and iron is ensured through a uniform and stable complexing ion solution; and the formation of porous spherical morphology is promoted through the volatilization of the acidic base solution in the rapid drying process. A spray drying method and a trace vanadium doping technology are combined, so that more active sodium sites in the ferric sodium phosphate pyrophosphate positive electrode material can be activated, the reversible de-intercalation sodium capacity can be improved, sodium ion diffusion can be promoted, the polarization voltage can be reduced, and the cycling stability of the material can be improved.

The invention provides a method for preparing a high-compaction lithium iron phosphate material from hydroxyl iron phosphate, which comprises the following steps: mixing hydroxyl iron phosphate with lithium phosphate, adding a carbon source and an additive, sanding, spray-drying, re-sintering and crushing to obtain particles A; mixing hydroxyl iron phosphate with lithium phosphate, adding a carbon source and an additive, and carrying out ball milling, sanding, spray drying and sintering to obtain particles B; adding a carbon source, a doping agent and a dispersing agent into the particles A, and carrying out ball milling to obtain slurry C; adding a carbon source, a doping agent and a dispersing agent into the particles B, and then carrying out ball milling and sanding to obtain slurry D; uniformly mixing the slurry C and the slurry D according to a certain proportion to obtain mixed slurry E, and then performing spray drying, sintering and crushing to obtain a lithium iron phosphate precursor; and adding a certain amount of carbon source into the lithium iron phosphate precursor, uniformly mixing, sintering and crushing to obtain the high-compaction lithium iron phosphate material.

The invention provides a biomass-derived spherical porous carbon material and a preparation method thereof, and a silicon-carbon negative electrode material and a preparation method thereof, and relates to the field of lithium ion batteries. The preparation method of the biomass-derived spherical porous carbon material comprises the following steps: carrying out pre-carbonization treatment on vinasse to obtain pre-carbonized vinasse, mixing the pre-carbonized vinasse with an acidic solution, and washing with water until the mixture is neutral to obtain pre-treated vinasse; mixing the pretreated vinasse with a pore-forming agent, a binder and water to prepare slurry, and performing spray drying on the slurry to obtain a spheroidized precursor; carrying out carbonization treatment on the spheroidized precursor; washing the carbonized spheroidized precursor with water until the spheroidized precursor is neutral, and drying the spheroidized precursor to obtain an intermediate; and activating the intermediate with water vapor to obtain the biomass-derived spherical porous carbon material. The material with a regular spherical and porous structure can be prepared, the material can be used for preparing a silicon-carbon negative electrode material with a stable structure, and the electrochemical performance of the silicon-carbon negative electrode material is improved.

The invention discloses novel vegetable protein-polysaccharide composite nanoparticle stable powdered oil and a preparation method thereof, and belongs to the technical field of powdered oil preparation. The preparation method of the novel vegetable protein-polysaccharide powdered oil comprises the following steps: adding water into vegetable protein, dispersing, stirring overnight, and hydrating to obtain vegetable protein dispersion liquid; adding water to disperse polysaccharide, stirring overnight and hydrating to obtain a polysaccharide dispersion liquid; mixing the vegetable protein dispersion liquid with the polysaccharide dispersion liquid, adjusting the pH value to be alkaline, heating, stirring, cooling, and adjusting the pH value to be neutral, so as to obtain vegetable protein-polysaccharide composite nanoparticle dispersion liquid; and adding an oil phase, shearing and emulsifying, homogenizing at high pressure, and finally spray-drying. According to the method, the vegetable protein-polysaccharide composite nanoparticles are prepared through the pH shift vegetable protein-polysaccharide mixture, the grease is encapsulated through spray drying, the stability of the grease is improved, the method can also be used for embedding curcumin and other active substances, and a new thought is provided for improving the stability of the active substances.

The invention discloses a ferric sodium pyrophosphate positive electrode material, a preparation method thereof and a battery, and relates to the technical field of batteries. Pre-sintering is performed; sanding and spray drying; and high-temperature sintering. Wherein the pH value of the reaction is controlled by using a Tris-HCl buffer solution in the hydrothermal reaction, so that the precursor is uniformly crystallized and has high crystallinity, and low-temperature segmented presintering is adopted later, so that the compaction density of the material can be controlled, and the related electrical properties of the material are relatively good. In the preparation process, a carbon source and a doping element are supplemented twice, so that carbon coating is uniform in the sintering process, the compaction density of the NFPP positive electrode material is further improved, the properties such as theoretical specific capacity of the positive electrode material are better through doping and carbon coating modification, and the high-compaction and high-capacity ferric sodium pyrophosphate positive electrode material is obtained.

The invention discloses a preparation method of a composite sodium iron phosphate positive electrode material with high compaction density, which is characterized by comprising the following steps: (1) mixing a sodium source, an iron source, a phosphorus source, a carbon source and the like for preparing the composite sodium iron phosphate positive electrode material in proportion to obtain a precursor aqueous solution; (2) adding a surfactant into the precursor aqueous solution, grinding and uniformly mixing to obtain a homogeneous precursor aqueous solution; (3) carrying out drying granulation on the homogeneous precursor aqueous solution by using a spray drying technology to obtain composite sodium ferric phosphate precursor particles; and (4) performing high-temperature heat treatment on the composite sodium ferric phosphate precursor particles under the protection of inert gas to obtain the composite sodium ferric phosphate positive electrode material. The sodium-ion battery positive electrode material and the electrode plate with high compaction density can be obtained, the reversible specific capacity of the sodium-ion battery is improved, the problem of low gram capacity exertion is solved, the battery capacity is improved, and high-quality sodium-ion battery supply is provided for the field of energy storage.

The invention belongs to the field of electrochemistry, and discloses a silicon-carbon negative electrode material based on nanocellulose and a preparation method and application thereof. The preparation method comprises the following steps: dispersing cellulose in deionized water, and carrying out physical stripping and ionic liquid assisted acidolysis to obtain a cellulose colloidal solution; and dispersing the conductive agent and the carbon source into the colloidal solution, adding the coupling agent and the silicon source, and carrying out spray drying and sintering. According to the invention, nano cellulose preparation and silicon carbon preparation processes are combined, so that an intermediate separation process is reduced, and the process is simplified. Meanwhile, in the silicon-carbon balling process, the ionic liquid and the coupling agent in the slurry can induce and promote surface combination of the carbon source and the silicon source; the nano cellulose promotes nano-micro forming of components such as silicon and carbon, and is coupled with the conductive agent in the carbonization process to form an internal conductive network and a coating layer; in the carbonization process, hydrolysis catalyst metal ions play a role in catalyzing gas source cracking deposition to form a stable coating carbon layer. The silicon-carbon material is novel in route, rapid electron transmission and capacity exertion are guaranteed through the conducting layers from inside to outside, and the cycling stability of the material can be improved through the multi-carbon-layer coating structure.

The invention relates to a silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: adding porous carbon into a fluidized bed, heating and introducing alkaline mixed gas to obtain amino porous carbon; transferring the amino porous carbon into fluidized bed equipment, vacuumizing, heating, and introducing hydroxyl silane gas for nano silicon deposition; after deposition, introducing ultraviolet light for polymerization and oxidation to obtain a modified silicon-carbon precursor material; transferring the modified silicon-carbon precursor material into a tubular furnace, introducing inert gas to discharge air in the tube, and performing first carbonization to obtain a silicon-carbon material; and adding the resin into an organic solvent, adding the fast ion conductor and the silicon carbon material to be uniformly dispersed, performing spray drying, and performing secondary carbonization to obtain the fast ion conductor coated silicon carbon composite material. The preparation method provided by the invention is simple and efficient, and the prepared silicon-carbon composite material can improve the fast charging performance and is suitable for a negative electrode material of a high-energy-density lithium ion battery.

The invention provides carbon-coated lithium iron phosphate and a preparation method thereof, a positive plate and a lithium ion battery. The preparation method comprises the following steps: S1, mixing raw materials including a lithium source, a phosphorus source, an iron source and a first solvent to obtain slurry; s2, sequentially carrying out spray drying and crushing treatment on the slurry to obtain a lithium iron phosphate precursor; s3, carrying out polymerization reaction on raw materials of the lithium iron phosphate precursor, styrene, an initiator and a second solvent in an inert atmosphere, and adding a cationic monomer in the polymerization reaction process to obtain a cationic polystyrene coated lithium iron phosphate precursor; and S4, calcining the cationic polystyrene coated lithium iron phosphate precursor in an inert atmosphere to obtain the carbon coated lithium iron phosphate. According to the preparation method disclosed by the invention, lithium iron phosphate is coated with a layer of porous carbon while being controlled to be nano-sized, so that the electrochemical impedance of the lithium iron phosphate material is reduced, and the rate capability of the lithium iron phosphate material is improved.

The invention discloses a lithium salt doped porous carbon coated graphite composite material for an energy storage battery and a preparation method thereof, the composite material has a core-shell structure, the core is graphite, and the shell is a lithium salt doped porous carbon complex. The preparation method comprises the following steps: uniformly mixing amino resin, a pore-forming agent and a heteroatom compound of the pore-forming agent, curing, activating to obtain porous carbon, adding the porous carbon into an inorganic lithium salt, uniformly mixing, and carrying out spray drying to obtain lithium salt doped porous carbon; the preparation method comprises the following steps: adding lithium salt doped porous carbon into a carboxymethyl cellulose lithium solution, uniformly dispersing, then adding into a graphite material, uniformly dispersing, spray-drying, and carbonizing to obtain the lithium salt doped porous carbon coated graphite composite material. According to the obtained material, the coating layer lithium salt is doped with porous carbon, so that the liquid absorption and retention capacity of the material is improved, the diffusion rate of lithium ions is increased, and the rate capability is improved; meanwhile, the expansion of the composite material in the charging and discharging process is reduced by utilizing the low expansion of the porous carbon, and the cycle performance is improved.

The invention relates to a preparation method of composite porous carbon beneficial to silicon deposition and a silicon-carbon composite negative electrode. The method comprises the following steps: (P1) carrying out surface oxidation treatment on porous carbon fine powder to obtain oxidized porous carbon fine powder; (P2) adding the oxidized porous carbon fine powder and ether polycarboxylic acid silanol into a solvent to obtain ether polycarboxylic acid silanol modified porous carbon fine powder; the ether polycarboxylic acid silanol is prepared by copolymerizing a polyether macromonomer, an acrylic monomer and an alkenyl silane coupling agent in water; (P3) soaking the ether polycarboxylic acid silanol modified porous carbon fine powder in a salt aqueous solution to obtain catalyst-loaded porous carbon; (P4) mixing the porous carbon loaded with the catalyst with a carbon source precursor solution, and performing spray drying to obtain a composite carbon precursor; and (P5) carbonizing and activating the composite carbon precursor to obtain the composite porous carbon beneficial to silicon deposition. The composite porous carbon prepared by the invention is beneficial to more uniform deposition of silicon in pores of the core porous carbon fine powder.

The invention belongs to the technical field of lithium ion battery materials, and discloses a bismuth silicate coated lithium ferric manganese phosphate material, a preparation method thereof and a lithium ion battery. The bismuth silicate coated lithium ferric manganese phosphate material comprises lithium ferric manganese phosphate and a coating layer coating at least part of the surface of the lithium ferric manganese phosphate, and the coating layer is made of bismuth silicate. Carrying out ball-milling mixing on the ferric manganese phosphate material, a lithium source, a carbon source and water to obtain mixed slurry; performing low-temperature spray drying on the mixed slurry to obtain a spray material; and carrying out wet mixing on a silicon source, a bismuth source and the spray material, carrying out high-temperature pyrolysis on the wet-mixed material in a spray pyrolysis furnace, and sintering to obtain the bismuth silicate coated lithium ferric manganese phosphate material. When the bismuth silicate coated lithium ferric manganese phosphate material is used as a positive electrode active material of a lithium ion battery, the high-temperature cycle performance of the battery can be improved while the high discharge capacity of the battery is ensured.