169results about How to "Reduce dissolution" patented technology

The invention provides a positive electrode material and a preparation method thereof, a positive electrode plate and a battery, the positive electrode material comprises lithium manganese iron phosphate particles, a first shell layer and a second shell layer, the first shell layer and the second shell layer sequentially coat the surfaces of the lithium manganese iron phosphate particles, the material of the first shell layer comprises nanoscale SiO2 particles, and the material of the second shell layer comprises nanoscale TiO2 particles. The surfaces of the lithium manganese iron phosphate particles are sequentially coated with the SiO2 layer and the TiO2 layer, so that the contact between the lithium manganese iron phosphate particles and an electrolyte can be reduced, the side reaction between the lithium manganese iron phosphate particles and the electrolyte in the electrochemical reaction process is reduced, the cycle life attenuation of the battery is relieved, the dissolution of Mn element is reduced, and the service life of the battery is prolonged. Therefore, the battery impedance increase caused by deposition of Mn < 2 + > on the negative electrode in the circulation process is relieved.

The invention belongs to the technical field of lithium batteries, and discloses a lithium nickel manganese oxide positive electrode material, a preparation method thereof and a lithium ion battery. Wherein the lithium nickel manganese oxide positive electrode material has a regular truncated octahedron single crystal structure, and the ratio K of a (111) crystal face orientation parameter to a (100) crystal face orientation parameter in an XRD (X-Ray Diffraction) spectrogram of the lithium nickel manganese oxide positive electrode material is 1-1.6. The lithium nickel manganese oxide positive electrode material provided by the invention has excellent rate capability and cycling stability, and can be well applied to production and manufacturing of lithium ion batteries.

The invention provides a positive active material and a preparation method thereof, a positive plate and a battery. The positive electrode active material satisfies the following conditions: I1 + I2 + I3 < = 10.20; wherein I1 is I (111) / I (311) in an XRD (X-Ray Diffraction) pattern of the positive electrode active material, I2 is I (111) / I (400) in the XRD pattern of the positive electrode active material, I3 is I (111) / I (440) in the XRD pattern of the positive electrode active material, and I1, I2 and I3 are all not 0. According to the positive electrode active material provided by the invention, the exposure degrees of the (110) surface, the (100) surface and the (311) surface are limited by the formula 1, so that the lithium ion conduction rate can be improved, the manganese dissolution phenomenon can be reduced, and the rate capability and the cycling stability of a corresponding battery can be remarkably improved.

The invention relates to the technical field of resources and environments, in particular to an industrial solid waste treatment method, a cementing material and a workpiece. The industrial solid waste treatment method comprises the following steps: providing nitrogen-doped biochar, wherein at least the surface of the nitrogen-doped biochar is combined with a nitrogen-containing group; industrial solid waste is provided, wherein the industrial solid waste contains heavy metal ions; the nitrogen-doped biochar and industrial solid waste are subjected to first mixing treatment, a gel material precursor is obtained, the gel material precursor can be further prepared into a gel material, and a workpiece is prepared. Heavy metal ions can be adsorbed and fixed by the nitrogen-doped biochar and are not easy to dissolve out to harm the environment, after adsorption, the mechanical property of a workpiece prepared from the cementing material is also improved, and meanwhile, the cementing material is endowed with a carbon sequestration effect. By means of the treatment method, the industrial solid waste containing the heavy metal ions can be recycled, the treatment method is controllable in process, and the prepared cementing material is excellent in performance.

The invention belongs to the technical field of lithium batteries, and provides a preparation method of a boron-doped coated lithium iron manganese phosphate positive electrode material and a lithium battery, and the method comprises the following steps: S10, performing first pretreatment based on a lithium source, an iron source, a phosphorus source, a dopant, a dispersant, a first MOF and a solvent to obtain a first precursor; s20, performing first sintering crushing on the first precursor in an inert gas atmosphere to obtain a lithium iron phosphate precursor; s30, performing second pretreatment based on the second MOF, deionized water, a carbon source, a dispersing agent and the lithium iron phosphate precursor to obtain a second precursor; and S40, grinding and drying the second precursor, and carrying out second sintering crushing in an inert gas atmosphere to obtain the lithium iron manganese phosphate positive electrode material. Wherein the first MOF is a boron-based MOF, and the second MOF is a manganese-based MOF. The lithium ion intercalation and deintercalation efficiency is improved, the specific capacity, the cycle capacity retention ratio, the compaction density and the safety of the battery are improved, and the performance of the material is improved from multiple aspects.

The invention discloses a doped iron manganese phosphate precursor, a preparation method and a lithium iron manganese phosphate positive electrode material, and belongs to the technical field of lithium ion batteries. The doped iron manganese phosphate precursor and the lithium iron manganese phosphate positive electrode material are prepared by adopting a hydrothermal method, and the grain size is refined by doping vanadium ions; the diffusion rate and the conductivity of lithium ions are improved, and the rate capability and the electronic conductivity of the positive electrode material are enhanced. And in the preparation process, quaternization modified sodium lignin sulfonate is used as a dispersing agent, so that the dispersity among particles is improved, and the problem that the electrochemical performance of the positive electrode material is reduced due to the fact that the particle size is too small and the particles are agglomerated due to vanadium doping is solved. The molecular chain of the quaternization modified sodium lignin sulfonate also contains dithio-carboxyl, so that manganese ions can be reduced and fixed while the dispersing performance of the dispersing agent is improved, the structural stability is improved, and the dissolution of manganese is reduced.

The invention relates to an additive for an electrolyte, a preparation method of the additive, the electrolyte and an electrochemical device, and the additive added into the electrolyte can reduce the acidity of a whole battery system, and reduce the dissolution of transition metal in a positive electrode active material and the loss of a negative electrode active material. Compared with other additives in the electrolyte, the additive has higher oxygenolysis potential, oxygenolysis of the electrolyte is effectively inhibited, the stability of solvents such as organic carbonic esters in the electrolyte is improved, the high-temperature resistance and high-voltage resistance stability of the lithium ion battery are further improved, meanwhile, the electrolyte can have good wettability and low viscosity, and the electrolyte can be used for lithium ion batteries. The lithium ion conductivity can be well improved, the rate capability and the safety of the battery are improved, and the electrolyte additive is a novel electrolyte additive for the lithium ion battery.

The invention provides a PtCo-based composite catalyst and a preparation method and application thereof.The PtCo-based composite catalyst comprises a carrier and a load, the carrier comprises mesoporous carbon, the load comprises platinum-cobalt-based metal particles and a compound with the chemical formula being HxMO3, and M comprises W or / and Mo; a contact interface exists between the platinum-cobalt-based metal particles and the compound with the chemical formula of HxMO3; the platinum-cobalt-based metal particles comprise a first part of the platinum-cobalt-based metal particles, and the first part of the platinum-cobalt-based metal particles are supported in the mesoporous structure of the mesoporous carbon. According to the PtCo-based composite catalyst, a contact interface exists between HxMO3 and PtCo-based metal particles, the catalytic activity of platinum and cobalt can be improved, and reduction of oxygen on the surface of the catalyst is facilitated; part of platinum-cobalt-based metal particles are supported in a mesoporous structure of mesoporous carbon, so that the stability of the catalyst can be improved.

The invention provides a coating-modified positive electrode material, a preparation method of the coating-modified positive electrode material, a positive electrode plate, a lithium ion battery and an electric device. The coating-modified positive electrode material comprises a substrate and a coating layer coating at least part of the surface of the substrate, the matrix comprises a lithium nickel cobalt manganese oxide material, the lithium nickel cobalt manganese oxide material comprises doping elements, and the doping elements comprise one or more of Sr, Ga, In, Ta, W, Zr, B, Al, Sb, Mo, Ti, La, Na and Sn; the coating layer comprises a bimetallic oxide, the bimetallic oxide comprises an element M and an element Q, the element M comprises one or more of Mg, Zn, Ni, Co, Cu, Ca, Fe, Be, Ba, Sr and Mn, and the element Q comprises one or more of A1, Cr, Co, Fe, Sc, Ga, In and V. The rate capability, the cycling stability and the high-temperature storage performance of the positive electrode material can be improved through the double functions of doping and coating.

The invention belongs to the field of battery materials, and particularly relates to a LiAlO2 coated lithium-rich manganese-based material as well as a preparation method and application thereof. The invention provides a preparation method of a LiAlO2 coated lithium-rich manganese-based material, which comprises the following steps: (1) mixing a precursor and a first lithium salt, and carrying out first sintering to obtain a first sintered material; (2) carrying out acid pickling on the first sintering material, mixing the first sintering material with an aluminum source and a second lithium salt, and carrying out second sintering to obtain a LiAlO2 coated lithium-rich manganese-based material; and carrying out acid pickling by adopting an organic acid solution. The LiAlO2 coated lithium-rich manganese-based material prepared by the preparation method disclosed by the invention is low in specific surface area, high in first efficiency and good in cycle performance.

The invention relates to a formula of a high-performance sodium-ion battery electrolyte, and aims to improve the cycle life, safety and rate capability of a sodium-ion battery. The electrolyte comprises sodium hexafluorophosphate as a sodium salt, carbonic ester as an organic solvent and a plurality of additives (fluoroethylene carbonate, bis (2, 2, 2-trifluoroethyl) carbonate, ethylene sulfate, 1, 3-allyl sultone and sodium difluoro (oxalato) borate). Through the synergistic effect of the additives, a stable positive electrode / electrolyte interface film (CEI) is formed, cation dissolution is reduced, and the sodium ion transmission performance and the high-voltage stability of the battery are improved. In a half cell assembled with a NaNi0. 4Fe0. 2Mn0. 4O2 positive electrode, when the electrolyte works in a voltage range of 2-4.2 V, the specific discharge capacity of more than 160mA. H / g is provided, and the capacity retention ratio exceeds 80% after 200 cycles at the rate of 1C.

The invention relates to a negative electrode material and a high energy density sodium ion battery, the negative electrode material comprises a positive plate, a negative plate, an electrolyte and a diaphragm, the positive electrode material of the positive plate is a layered transition metal oxide with a coating layer on the surface, the negative electrode material of the negative plate is spherical hard carbon with Na2Ti6O13 coated on the surface, the electrolyte is an ether electrolyte, and the diaphragm is a lithium ion battery. And the CB value of the sodium ion battery is 0.4 to 0.8. As the capacity of the battery is determined by the capacity of the positive electrode, the capacity of the negative electrode in the unit area of the sodium ion battery is lower than the capacity of the positive electrode, so that the ratio of the negative electrode in the battery is reduced, the ratio of the positive electrode in the battery is increased, and a sodium deposition layer can be prevented from being formed on the surface of the negative electrode by selecting the specific positive electrode material, negative electrode material and electrolyte. The sodium ion battery prepared by matching the materials has relatively high energy density and cycle performance.

The invention discloses a method for green and efficient extraction of functional components in spina date seeds. The method comprises the following steps: crushing spina date seeds, removing seed coats and endosperm, deoiling cotyledons with petroleum ether, performing low-temperature water extraction on peeled and deoiled spina date seed powder, filtering and clarifying extract liquid with a hollow fiber membrane or a ceramic membrane, performing reverse osmosis concentration to remove most of water, and drying concentrated liquid to obtain the spina date seed extract highly enriched with functional components. In the extraction process, petroleum ether is used in the deoiling part, only water is used in the other steps, no solvent with obvious toxicity and pollution is used in the whole extraction method, the method has the advantages of safety, environmental protection, simple process, low cost, good extraction effect and the like, and the obtained extract is green and safe, can be directly used in the fields of medicines, foods and the like, and has wide application prospects. And by-products such as seed coats and endosperm of spina date seeds, extracted spina date seed oil and spina date seed starch and protein settled at the bottom after extraction can be further utilized and developed, so that more additional values are created for enterprises.

The invention provides an electrolyte, a preparation method thereof and a lithium ion battery, the electrolyte comprises an organic solvent, an additive and a lithium salt, and the additive comprises an additive A. The additive A is added into the electrolyte, and the imidazole group in the additive A enables the additive A to participate in positive electrode film formation and negative electrode film formation, so that the stability of a solid electrolyte interface film is improved; in addition, the additive A can be used as a Lewis base to capture H2O and corrosive substances such as phosphorus pentafluoride and hydrofluoric acid in the battery, so that side reactions between water, gas and the corrosive substances and other components in the battery are reduced; in addition, the cyano group, the cyanoethyl group or the dimethylene cyano group and other groups in the additive A can be used as Lewis base to adsorb hydrofluoric acid. And the additive A can improve the stability of interface films of the positive and negative solid electrolytes and reduce side reactions between water, gas and corrosive substances and other components in the battery, so that the high-temperature storage performance and the cycle performance of the battery are improved.

The invention provides a clay lithium ore pretreatment method which comprises the steps that clay lithium ore powder is soaked in an acid solution containing a surface active agent, and the surface active agent is at least one of a cationic surface active agent, a non-ionic surface active agent and an ampholytic surface active agent; the acid solution is at least one of a sulfuric acid solution, a hydrochloric acid solution, a nitric acid solution and a phosphoric acid solution; the invention further provides a method for extracting lithium from the clay lithium ore. The method comprises the pretreatment method. The acid solution containing the surfactant is used for pretreatment, hydroxyl groups attached to the surface of the clay lithium ore powder can be activated, the bleaching effect is achieved, and subsequent dissolution of non-ferrous metal ions such as Fe is reduced; the surface tension of the clay lithium ore powder can be reduced, the contact area of an acid solution is increased, the clay lithium ore powder is more sufficiently infiltrated and permeated by the acid solution, and the leaching rate of lithium is increased.

The invention belongs to the technical field of battery materials, and particularly relates to a lithium ion battery electrolyte containing a cyano sulfonamide compound and a lithium ion secondary battery, the lithium ion battery electrolyte containing the cyano sulfonamide compound comprises an organic solvent, a lithium salt and an additive, the additive comprises at least one substance of fluoroethylene carbonate, ethylene sulfate, ethylene sulfite, 1, 3-propane sultone, 1, 3-propenyl sultone, vinylene carbonate and vinylethylene carbonate, and a cyano sulfonamide compound, and the additive comprises at least one substance of fluoroethylene carbonate, ethylene sulfate, ethylene sulfite, 1, 3-propane sultone, 1, 3-propenyl sultone, vinylene carbonate and vinylethylene carbonate; the invention relates to a lithium ion secondary battery which comprises a battery cell, a battery shell and electrolyte, the electrolyte additive, the organic solvent and the lithium salt of specific types are matched, so that the cycle performance of the lithium ion battery under high voltage can be effectively improved, and the lithium ion battery prepared from the lithium ion battery electrolyte has excellent cycle performance under high voltage.

The invention provides a positive electrode active material, positive electrode slurry, a positive plate and a battery, and belongs to the technical field of batteries, the positive electrode active material comprises lithium manganese iron phosphate and lithium-rich lithium ferrite; wherein the mass ratio of the lithium-rich lithium ferrite added in the positive electrode active material is 0.5%-5%; the particle size D50 of the lithium manganese iron phosphate is d1, the particle size D50 of the lithium-rich lithium ferrite is d2, and d1 / d2 is larger than or equal to 0.05 and smaller than or equal to 0.32. In the embodiment of the invention, the positive electrode active material comprises lithium manganese iron phosphate and lithium-rich lithium ferrite. When the positive electrode active material is applied to a battery, lithium-rich lithium ferrite and lithium iron manganese phosphate are compounded, a proper adding proportion of the lithium-rich lithium ferrite is set, and the particle sizes of the lithium iron manganese phosphate and the lithium-rich lithium ferrite are in a proper proportion, so that the gram volume and the cycle performance can be improved when the positive electrode active material is applied to the battery; and the rate capability is kept in a good range.

The invention belongs to the technical field of energy materials and electrochemistry, and particularly relates to a carrier composite platinum-nickel alloy catalyst and a preparation method and application thereof. The preparation method comprises the following steps: (1) ball-milling and dispersing a carbon carrier into a solvent to form a uniform suspension; adding nickel salt into the uniform suspension, and shearing and dispersing to form uniform slurry; introducing an inert atmosphere into the uniform slurry, adding a platinum raw material solution, and carrying out ultrasonic shearing dispersion to form uniformly dispersed carbon slurry; (2) carrying out rotary evaporation on the carbon paste, and drying to obtain a metal precursor; (3) mixing, ball-milling and dispersing the metal precursor and the nitrogen source precursor; and (4) putting the obtained mixture into a tubular furnace, introducing inert gas for purging, heating, cooling, and taking out to obtain the carrier composite platinum-nickel alloy catalyst. According to the invention, the composite carrier is introduced in the preparation process of the catalyst, so that the binding force of the catalyst carrier to PtNi nanoparticles and the tolerance of high potential can be improved.

The invention provides a lithium manganate composite material and a preparation method thereof, a positive plate, a battery and power-related equipment, and relates to the technical field of lithium batteries. A metal organic framework coating layer is formed on the surface of a lithium manganate particle through metal reaction of an organic ligand and a metal salt, and the metal organic framework coating layer is converted into the lithium manganate composite material formed by coating the lithium manganate particle with a composite material of a metal oxide and carbon through a pyrolysis process. The lithium manganate composite material provided by the invention is simple in preparation method and low in cost, and has a wide industrial application prospect.

The invention provides a modified lithium manganese iron phosphate positive electrode material and a preparation method thereof, a positive electrode and a battery, the modified lithium manganese iron phosphate positive electrode material comprises an inner core and a coating layer located on the surface of the inner core, the chemical formula of the inner core comprises LixMnyFe1-yDzP1-zO4 (Ph), D is selected from Se and / or Te, 1 < = x < = 1.05, 0.2 < = y < = 0.8, 0.01 < = z < = 0.055, 1.001 lt; 1-z + h < = 1.055; the preparation method comprises the following steps: mixing a carbon source, a lithium source, an iron source, a manganese source, a D source and a phosphorus source according to a molar ratio of a molecular formula A, grinding and drying to obtain a precursor; performing first sintering on the precursor to obtain a first sample; and mixing and supplementing a phosphorus source, a carbon source and the first sample, and sequentially grinding and secondarily sintering to obtain the modified lithium iron manganese phosphate positive electrode material. According to the invention, the problem of electrochemical performance degradation caused by manganese dissolution is reduced, and the discharge capacity and the cycle stability of the lithium ion battery are improved.

The invention provides toughened anti-cracking and anti-corrosion solid waste concrete and a preparation method thereof. Mixing the cement, the fly ash, the slag and the natural aggregate; sequentially adding water, a weakly alkaline regulator and an additive solution containing a polycarboxylic acid water reducer to obtain concrete slurry; and curing to obtain the product. According to the invention, fly ash, slag solid waste and natural aggregate are used as aggregate, a water reducer is added to reduce the water consumption of concrete and improve the fluidity of concrete, and specially-made weakly-alkaline conditioning agent particles are introduced, so that the self-water-absorption-water-release behavior and bridging effect of the particles are utilized to improve the concrete fluidity. The early-stage and later-stage continuous hydration ability of a rubber material in the concrete is enhanced, the self-shrinkage and drying shrinkage resisting effects are achieved, the compactness and corrosion resistance of the concrete are improved, and then the anti-cracking ability of the all-solid waste concrete is improved. The surface of an obtained test piece is free of cracks, the 28d compressive strength reaches 46.6 MPa, the 28d breaking strength reaches 8.5 MPa, the self-shrinkage rate is 0.035%, and the drying shrinkage rate is 0.01%.

The purpose of the present invention is to improve the life of a battery using a negative electrode comprising a metal by reducing the amount of gas generation, reducing the resistance, and reducing the amount of metal elements such as Mn and Ni deposited in a positive electrode in the negative electrode. A secondary battery having a liquid electrolyte and a negative electrode in which a fluoropolymer is laminated on a layer containing a metal, the secondary battery being characterized in that: the metal is at least one type selected from the group consisting of lithium, sodium, magnesium and zinc; the fluoropolymer is a copolymer having a vinylidene fluoride unit (A) and a structural unit (B) of at least one monomer selected from the group consisting of tetrafluoroethylene, trifluoroethylene, chlorotrifluoroethylene, a monomer represented by general formula (1), a monomer represented by general formula (2), and a monomer represented by general formula (3), and the liquid electrolyte contains a fluorinated ether. [chemical formula 1] # imgabs0 # [chemical formula 2] # imgabs1 # [chemical formula 3] # imgabs2 #

The invention provides a method for efficiently extracting naringin and hesperidin from fingered citron, and belongs to the technical field of plant active ingredient extraction. The extraction method comprises the following steps: degreasing and filtering fingered citron powder in advance, refluxing and extracting hesperidin in filter residues by using an alkaline ethanol solution, adsorbing filtrate by using macroporous resin, eluting by using ethanol, concentrating under reduced pressure, and recrystallizing to obtain the naringin. According to the method, the naringin and the hesperidin in the fingered citron are jointly extracted by adopting multiple extraction processes, so that the naringin and the hesperidin can be separated, the extraction rate and the purity of the naringin and the hesperidin can be improved, and meanwhile, the method also has the characteristics of small dosage of an organic solvent, high degreasing efficiency, less impurity dissolution and the like.

The invention belongs to the technical field of sample injection isolation pads, and discloses a low-volatility and low-dissolution silica gel isolation pad and a preparation process. The silica gel shock insulator is prepared from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 40 to 50 parts of fumed silica, 8 to 10 parts of mixture of hexamethyl cyclotrisilazane and octamethyl cyclotetrasilazane, 0.5 to 0.8 part of diethyl maleate, 2 to 3 parts of diphenyl silanediol, 3 to 5 parts of titanium dioxide and 0.5 to 1 part of vulcanizing agent. According to the invention, through reasonable formula design and optimization of the types and contents of the raw materials, the molded rubber material is ensured to have a relatively good crosslinking degree, vulcanized small-molecular products are effectively prevented from excessively migrating to the surface, and meanwhile, part of small-molecular substances are extracted in advance by adopting a specific production process, so that the service life of the rubber material is prolonged. The product is ensured to have better cleanliness in the subsequent use process, and the low-volatility and low-dissolution silica gel insulation pad is obtained.

The invention relates to a mine wastewater dephosphorization treatment system and a dephosphorization method, and belongs to the technical field of water dephosphorization. Iron nitrate nonahydrate and ferric chloride hexahydrate are creatively used as iron sources, glucose is used as a carbon source and a reducing agent, urea is used as an alkali source, a granular material with ferroferric oxide as a core and a carbon layer as a shell is synthesized on the basis of a hydrothermal synthesis method, then an aqueous hydrogen peroxide solution is used for further oxidation treatment, more oxygen-containing groups are constructed, and the oxygen-containing groups are prepared. The preparation method comprises the following steps: preparing a metal lanthanum modified material, then adding lanthanum chloride for doping lanthanum to obtain the metal lanthanum modified material, and finally, sequentially carrying out surface modification on the metal lanthanum modified material through polydopamine and an amino silane coupling agent to prepare the phosphorus removal agent, so that when the phosphorus removal agent is used for removing phosphorus from mine wastewater in a phosphorus removal treatment system provided with an electromagnet, only simple magnetic attraction treatment is needed, and the phosphorus removal efficiency is greatly improved. The dephosphorization agent can be separated and recycled through the method, meanwhile, metal lanthanum in the dephosphorization agent is still dissolved out less even though the dephosphorization agent is used for mine wastewater with high acidity, and the dephosphorization effect is very good.

This utility model discloses a modular electrolytic reaction tank for preparing high-purity metallic magnesium, belonging to the field of metallic magnesium reaction tanks. It includes a reaction tank body, with a cover plate fixedly connected to the upper surface of the body by multiple bolts. A conveying pipe is fixedly connected to the left side of the upper surface of the cover plate. A collection box is fixedly connected to the right side of the lower inner surface of the reaction tank body. A through-type collection port is opened on the upper left side of the inside of the collection box. This utility model achieves efficient and rapid separation through the unique structure of the collection box and related components. When the liquid magnesium reaches a certain thickness, the level gauge detects a signal, the electric push rod is activated, pushing the sliding plate two. Through the gas box and gas delivery hole, the sliding plate one moves the baffle one upward, opening the collection port. Liquid magnesium quickly flows into the collection box, greatly reducing the residence time of liquid magnesium in the reaction tank body, effectively reducing impurity dissolution, and improving the purity of metallic magnesium and product quality.

The invention provides an organic-inorganic hybrid solid-state polymer electrolyte coated high-nickel positive electrode material as well as a preparation method and application thereof, and relates to the technical field of all-solid-state lithium batteries. The high-nickel positive electrode material coated with the organic-inorganic hybrid solid polymer electrolyte comprises an inner core and an organic-inorganic hybrid coating layer coated on the surface of the inner core, the inner core is made of a high-nickel positive electrode material; the organic-inorganic hybrid coating layer comprises a ring-opening copolymer of maleic anhydride and 1, 3-dioxolame, and Li3PO4 nanocrystals are embedded into the ring-opening copolymer of maleic anhydride and 1, 3-dioxolame in situ. According to the invention, a flexible and compact coating layer with ionic conductivity is constructed on the surface of the high-nickel positive electrode material, so that the problems of violent interface side reaction, large interface impedance and poor cycling stability existing between the high-nickel positive electrode material and sulfide solid electrolyte are solved; therefore, the electrochemical performance of the material in a sulfide all-solid-state lithium battery is remarkably improved.

The invention belongs to the technical field of lithium ion batteries, and discloses a lithium manganese iron phosphate material and a preparation technology thereof.Titanium / silicon dioxide aerogel is added in the preparation process of the lithium manganese iron phosphate material, an iron source, a manganese source and a phosphorus source are co-precipitated on the titanium / silicon dioxide aerogel, iron ions and manganese ions can be kept in a stable and unified valence state, and the lithium manganese iron phosphate material is prepared. The dissolution of manganese is reduced; a silicon atom framework can improve the stability of the material and provide a high-conductivity network for transmission of lithium ions and transfer of electrons, and doping of titanium atoms can change the electronic structure of the material, increase the conductivity of the material and further accelerate the conduction efficiency of the lithium ions, so that the conductivity of the lithium ion battery is improved. The transmission path of electrons is optimized, and the problems that the lithium manganese iron phosphate material is poor in conductivity and low in lithium ion diffusion rate are solved.

The invention discloses a lithium iron manganese phosphate composite material and a preparation method and application thereof, belonging to the technical field of lithium batteries. The composite material comprises the following raw materials: a lithium source, a manganese source, an iron source, phytic acid, graphene oxide, polyvinyl alcohol, pyrrole and a dopant. The invention adopts a hydrothermal method to make hydroxyl groups on the surface of graphene oxide react with phytic acid to obtain a mixed solution a, and similarly obtains a mixed solution b containing polyvinyl alcohol phytate, combines a manganese source, a lithium source and an iron source, prepares a semi-finished product by roasting, and then coats a doped polypyrrole layer on the surface of the semi-finished product to finally obtain a lithium iron manganese phosphate composite material with a three-dimensional structure. The three-dimensional structure is a composite structure of a rod-like structure and a sheet structure. Compared with the lithium iron manganese phosphate material with a single morphology in the prior art, the specific surface area is significantly improved, the stability is stronger, the contact area with the electrolyte is larger, and the diffusion efficiency of lithium ions and the charge and discharge performance of the battery are improved.

The invention discloses a lithium manganate positive electrode material, a preparation method and an applied lead-lithium battery, relates to the technical field of lithium manganate positive electrode materials, and solves the problems that the existing lithium manganate positive electrode material is poor in structure and interface stability and poor in rate and cycle performance. The positive electrode material is composed of a lithium manganate matrix and a double-layer composite coating, the matrix is prepared by taking lithium carbonate and manganous-manganic oxide as raw materials and doping magnesium hydroxide, aluminum hydroxide and titanium dioxide multi-plasma phase; the lithium manganate positive electrode material is prepared by uniformly compounding a lithium manganate matrix modified by a spinel inner layer, vinyl functionalized MOF and a polyvinylidene fluoride-hexafluoropropylene copolymer on the surface of an aluminum foil receiver through an electrospinning-electrospray synergistic process. The material is applied to the lead-lithium battery, shows excellent electrochemical performance and has good practical application value.