5254 results about "Cathode material" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

The invention discloses a lithium manganese iron phosphate positive electrode material with a core-shell structure, which is prepared by the following steps: mixing a manganese source, an iron source, a phosphorus source, lithium carbonate and a carbon source, grinding and drying to prepare a pre-sintered material; then carrying out gas crushing on the pre-sintered material to obtain a pre-gas crushed material, and carrying out heat preservation at the temperature of 200-600 DEG C; putting the pre-gas crushed material subjected to heat preservation into an iron salt solution for quenching reaction to obtain iron compound coated lithium manganese iron phosphate; and finally, mixing the lithium iron manganese phosphate coated with the iron compound, a lithium source, a phosphorus source and a carbon source, grinding, drying, and carrying out secondary calcination to obtain the lithium iron manganese phosphate material with the core-shell structure. During preparation of the lithium manganese iron phosphate positive electrode material, a lithium manganese iron phosphate pre-sintered body and an iron salt solution are subjected to a quenching reaction to form an iron compound coated lithium manganese iron phosphate pre-sintered body, and then the iron compound coated lithium manganese iron phosphate pre-sintered body and other raw materials of lithium iron phosphate are subjected to a secondary calcination reaction to generate the composite positive electrode material with a core-shell structure. A coating structure is formed, the reaction between manganese and electrolyte is reduced, the dissolution of manganese is inhibited, the Gingtaler effect of manganese is relieved, and the stability of the material is improved; and the material has the advantages of high energy density, high power density, excellent cycle performance and strong core-shell interface bonding force.

The embodiments described herein involve electrochemical cells that have a heating element integrated into the electrochemical cell. In some aspects, an electrochemical cell comprises an anode current collector, an anode material disposed on the anode current collector, a cathode current collector, a cathode material disposed on a first side of the cathode current collector, a separator disposed between the anode material and the cathode material, and a heating element disposed on a second side of the cathode current collector, the second side opposite the first side. The heating element may include an electrically conductive material and a conductive material and disposed in an insulative material.

The invention discloses a zinc-iodine battery positive electrode material based on corn straw shell derived porous carbon and a preparation method of the zinc-iodine battery positive electrode material. According to the material, corn straw shells serve as the sole carbon source, an indigenous nitrogen-doped biomass charcoal carrier with a hierarchical pore structure is prepared through pre-carbonization and KOH activation processes, and the material is characterized in that the specific surface area is larger than or equal to 1500 m < 2 > / g, and the micropore proportion is larger than 90%. The iodine is loaded on the carrier (the iodine content is greater than or equal to 45wt%) through a vacuum sublimation method to form the indigenous nitrogen-doped biomass charcoal / iodine composite material. According to the positive electrode material, through the synergistic effect of physical confinement and pyridine nitrogen chemical adsorption, the multi-iodide shuttle effect is effectively inhibited, so that the capacity retention rate of the zinc-iodine battery is greater than or equal to 93% after 40000 cycles under the current density of 2A g <-1 >, and the capacity retention rate is greater than 45% under the rate of 10A / g. The method has double benefits of agricultural waste resource utilization and high-performance energy storage device development.

The invention provides a lithium cobalt oxide positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a first lithium cobalt oxide burning product with a coating agent to obtain a first mixture; mixing the second lithium cobalt oxide primary burning product with a coating agent to obtain a second mixture; the particle size D50 of the second lithium cobalt oxide fired product is smaller than the particle size D50 of the first lithium cobalt oxide fired product; and mixing and sintering the first mixture and the second mixture to obtain the lithium cobalt oxide positive electrode material, according to the preparation method, distribution of coating substances in the lithium cobalt oxide material is balanced by adjusting a large and small particle grading mixing process, so that the content of coating agents on the surfaces of different particles is controllable, the problems that the stability of the material is poor and coating layers on the surfaces of the large and small particles are uncontrollable during blending are solved, and the capacity and the cycle performance of the material are improved.

The invention provides a titanium-doped high-nickel ternary positive electrode material and a preparation method thereof. The titanium-doped high-nickel ternary positive electrode material comprises a high-nickel ternary positive electrode material and a titanium-doped element, and the content of the titanium-doped element accounts for 0.5-5wt% of the titanium-doped high-nickel ternary positive electrode material. The preparation method comprises the following steps: preparing a nickel-cobalt-manganese hydroxide precursor; uniformly mixing the nickel-cobalt-manganese hydroxide precursor with a lithium source, sintering and cooling to obtain a high-nickel ternary positive electrode material; and mixing and sintering the high-nickel ternary positive electrode material and a reducing titanium source to obtain the titanium-doped high-nickel ternary positive electrode material. Reducing titanium is used for modifying the high-nickel ternary material, more stable Ni < 2 + > is enriched on the surface of the material through an oxidation-reduction reaction to serve as a protective layer, corrosion of electrolyte to the material is reduced, and the surface stability of the material is improved; the titanium element can enter material crystal lattices more easily compared with a common doping method; the lattice structure strength of the material is improved through a relatively strong Ti-O bond, and excellent cycling stability and rate capability are obtained.

The invention relates to a preparation method and application of high-compaction-density composite sodium ferric phosphate. The preparation method comprises the following steps: weighing a sodium source, an iron source and a phosphorus source according to a stoichiometric ratio of [xNa + (a-x) A]: [yFe + (b-y) B]: P = a: b: (c + 2), mixing and dispersing the iron source, the sodium source, the phosphorus source and a chelating agent into pure water, reacting for a period of time at a certain temperature, transferring into a sand mill for grinding, adding a dispersing agent, cane sugar, the dopants A and B, and obtaining slurry F after grinding; and carrying out spray drying on the slurry F to obtain powder K. The powder K is transferred to a tubular furnace, and the oxygen content is 1t under the N2 protective atmosphere; and calcining at the temperature of 450-600 DEG C under the pressure of 50 ppm, and then carrying out air jet pulverization to obtain sodium ferric pyrophosphate positive electrode material powder with high compaction density and a molecular formula of (NaxAa-x) (FeyBb-y) (PO4) cP2O7. When the product is used, the compaction density is high, the dynamic performance of the material is enhanced, the thermal stability and chemical stability of the material are improved, and the electrochemical performance is good.

The invention discloses a method for preparing a composite positive electrode material by using a waste battery, and belongs to the technical field of battery recovery. The method comprises the following steps: discharging, disassembling and sorting a waste lithium iron phosphate battery to obtain a positive plate, carrying out water treatment, separating from an aluminum foil to obtain a waste lithium iron phosphate sheet, adding sodium hypochlorite, tetraethoxysilane, deionized water and hydrochloric acid, stirring to obtain SiO2-coated iron phosphate precipitate particles and a lithium-containing solution, adding sodium hydroxide into the lithium-containing solution to adjust the pH value, and carrying out solid-liquid separation to obtain the lithium-ion battery cathode material. Adding sodium carbonate, heating and drying to obtain lithium carbonate precipitate. And adding a carbon source and alcohol into the SiO2-coated iron phosphate precipitate particles and lithium carbonate, carrying out ball milling, taking out, drying, and calcining in a protective atmosphere to obtain the positive electrode composite material. Compared with the prior art, according to the prepared positive electrode composite material, material particles contain a lithium silicate network, so that the specific discharge capacity of a battery material is effectively improved. The method is simple in process and suitable for comprehensive utilization of waste batteries.

The invention discloses a modified carbon-coated sodium manganese ferric phosphate pyrophosphate / sodium ferric phosphate pyrophosphate positive electrode material as well as a preparation method and application thereof, and relates to the technical field of new energy materials. The preparation method comprises the following steps: preparing MnFe-MOF from a manganese source, a first iron source and a first organic ligand under a hydrothermal reaction; a second iron source, the MnFe-MOF and a second organic ligand are subjected to a hydrothermal reaction, and MnFe-MOF / Fe-MOF is obtained; uniformly mixing with a sodium source and a phosphorus source, and sintering to obtain a positive electrode material; and carrying out high-temperature gas-phase etching treatment to obtain the fluorine-doped carbon-coated modified sodium manganese ferric phosphate pyrophosphate / sodium ferric phosphate pyrophosphate positive electrode material. The material disclosed by the invention has a coating modified structure, so that an interface side reaction caused by direct contact between sodium ferromanganese phosphate and an electrolyte can be effectively avoided, a manganese dissolution phenomenon is reduced, and the structural stability of the material is improved; and meanwhile, the material has high conductivity, excellent structural stability, excellent long cycle life and excellent rate capability.

The invention relates to the technical field of lithium ion batteries, in particular to a gradient-doped lithium iron phosphate positive electrode material and a preparation method and application thereof. The invention provides a gradient doped lithium iron phosphate positive electrode material, on a particle cross section of the lithium iron phosphate positive electrode material, a particle center is taken as a circle center, a distance from the particle center to a nearest surface is taken as a radius R, a concentric circle region with a radius of 0.5 R is taken as a central region, and the rest part is a surface layer region, the metal doping amount of the central region is D1, the metal doping amount of the surface layer area is D2, D1 is larger than D2, delta D is equal to D1-D2, and delta D is larger than or equal to 2000 ppm and smaller than or equal to 4000 ppm. In the obtained lithium iron phosphate positive electrode material, sufficient compaction density can be ensured, the problem of poor dynamic performance of the positive electrode material can be well solved, and the discharge performance and rate capability of the lithium iron phosphate positive electrode material are effectively improved.

The invention discloses a method for regenerating waste lithium iron phosphate into a lithium manganese iron phosphate positive electrode material under assistance of element doping. According to the method, the waste lithium iron phosphate is successfully regenerated into the lithium manganese iron phosphate material with excellent performance through solid-phase sintering and element doping. Compared with a traditional repairing and regenerating method, the method has the advantages that upgrading and regenerating of the waste lithium iron phosphate are realized, and the market competitiveness of regenerated products is improved. Compared with other methods, the method does not need an acid leaching step, and the recovery process is simpler and more environment-friendly. And an element doping modification means is introduced, so that the performance of the regenerated lithium manganese iron phosphate material is further improved. The invention aims to provide a green, efficient and high-valued method for upgrading and regenerating the waste lithium iron phosphate positive electrode material into the lithium iron manganese phosphate positive electrode material with industrial application prospects.

The invention discloses a positive electrode material of an upward flow type electrochemical dephosphorization system, and the preparation method comprises the following steps: preparing a polyaniline-coated ZIF-8 derived carbon loaded magnesium-aluminum double-metal hydroxide electrode material, and the preparation process comprises ZIF-8 carbonization in a nitrogen atmosphere, aniline oxidation polymerization, and loading of magnesium-aluminum double-metal hydroxide by a coprecipitation method; the electro-adsorption positive electrode material belongs to a polyaniline magnesium aluminum double-metal hydroxide mesoporous synergistic platform in ZIF-8 derived carbon, and has a nano frame with strong pore accessibility and high electrochemical activity; the synergistic process comprises attraction of polyaniline to phosphate ions and trapping of the magnesium-aluminum double-metal hydroxide. The electrode prepared by the method has a unique mesoporous framework, a large number of phosphorus removal sites are obtained on the surface of the electrode, a rapid ion storage behavior mainly based on a capacitance control process is realized on a solid-liquid interface, phosphate in water can be effectively separated in an electro-adsorption system, and the method is a pollution control process with a clear mechanism.

The invention belongs to the field of battery materials, and discloses a high-entropy high-nickel positive electrode material which comprises a base material LiNixCoyMzO2, a base further comprises a lithium-site doping element and a nickel-site doping element, the surface of the base is coated with an island-shaped coating layer, and the island-shaped coating layer is a nano metal oxide layer. The preparation method comprises the following steps: uniformly mixing a high-nickel hydroxide precursor, a lithium source, a compound containing an element A and a compound containing an element B, carrying out two-stage sintering, mixing with a metal oxide containing an element C and a metal oxide containing an element D, and sintering to obtain the high-entropy high-nickel positive electrode material. Lithium doping in a bulk phase of the high-entropy high-nickel positive electrode material can improve the electronic conductivity of a single crystal material, increase the interlayer spacing of transition metal and inhibit lithium and nickel positive ions from being mixed, and nickel doping can improve the structural stability and thermal stability of the material, inhibit irreversible phase change of H2-H3 and stabilize lattice oxygen of the material; the doping modification of the two sites further improves the performance of the material.

The invention discloses an A-site high-entropy solid oxide fuel cell cathode material as well as a preparation method and application thereof, and provides an A-site high-entropy solid oxide fuel cell cathode material Pr < 0.2 > M < 0.2 > La < 0.2 > Ba < 0.2 > Sr < 0.2 > Co < 0.8 > Fe < 0.2 > O < 3-delta > with a perovskite phase. The preparation method comprises the following steps: S1, weighing multi-element metal nitrates, and mixing to obtain a first mixed solution; s2, dissolving ethylenediamine tetraacetic acid in ammonia water to obtain a second mixed solution; mixing the first mixed solution, the second mixed solution and citric acid to form a mixed precursor solution; s3, carrying out second heating treatment on the mixed precursor solution, and adjusting the pH value to form a gel precursor; and S4, carrying out pre-sintering treatment, third heat treatment and calcination treatment on the gel precursor to obtain a high-grade powder precursor, and carrying out ball milling and sieving treatment to obtain the A-site high-entropy solid oxide fuel cell cathode material. The cathode material is high in stability and good in chemical compatibility with a barrier layer GDC, provides high-quality mass transfer channels and active sites for O2 / O- / O2-, and has good electrochemical performance at medium and low temperatures.

The invention relates to a lithium-rich manganese-based positive electrode material as well as a precursor and a preparation method thereof, and belongs to the technical field of batteries. The problems that an existing lithium-rich manganese-based positive electrode material is low in ion diffusion coefficient, poor in rate capability, poor in cycle performance and the like are solved. The preparation method comprises the following steps: uniformly mixing transition metal salt, a precipitant and a complexing agent with water to obtain a transition metal salt solution, a precipitant solution and a complexing agent solution; regulating and controlling the pH value of the base solution in the reaction kettle by adopting a precipitant solution and a complexing agent solution; under the protection of inert atmosphere, liquid is fed into the reaction kettle, the nucleation-growth process of the primary particles is adjusted by dynamically adjusting the pH, temperature and stirring speed of the system, the crystal face orientation, particle size and stacking mode of the primary particles are controlled, and then the morphology of the secondary particles is regulated and controlled; after the liquid feeding is finished, aging, and carrying out suction filtration, washing and drying to obtain a precursor; the positive electrode material prepared from the precursor has rate capability and high energy density performance.

The invention discloses a preparation method and application of a carbon-loaded cobalt nanoparticle and iron monatomic electro-catalytic material, relates to a preparation and regulation method of a zinc air battery cathode catalyst, and solves the problems of low electricity generation performance and poor stability of an existing rechargeable zinc air battery cathode. Specifically, a high-efficiency and stable-catalysis carbon-loaded cobalt nanoparticle and iron monatomic electro-catalysis material is reasonably designed and successfully synthesized by utilizing the adsorption effect of a metal organic framework (MOFs) and polyvinylpyrrolidone as an ion adsorption layer, and under the condition that active sites are not sacrificed, the high-efficiency and stable-catalysis carbon-loaded cobalt nanoparticle and iron monatomic electro-catalysis material can be used for preparing a high-efficiency and stable-catalysis carbon-loaded cobalt nanoparticle / iron monatomic electro-catalysis material. And the dispersity of cobalt nanoparticles and the catalytic activity of iron monatomic are improved. The obtained material is used as a zinc air battery cathode material, the overall performance of a rechargeable zinc air battery can be improved, and efficient and oriented conversion of the zinc air battery is achieved.

The invention provides a ternary positive electrode material and a preparation method thereof, a positive electrode and a battery, and is applied to the field of batteries, the ternary positive electrode material comprises a self-supporting micro-cage structure, the material of the micro-cage structure is a high-nickel ternary material, the micro-cage structure is internally provided with a cavity, and part of the cavity in the micro-cage structure is filled with a conductive agent. A cavity is formed in the micro-cage structure and can allow lithium ions to enter and exit. Through the structural design, the volume expansion or shrinkage of the high-nickel ternary material in the charging and discharging process can be effectively inhibited, the structural change of the material is reduced, the stability of the high-nickel ternary material is improved, and the cycle performance of the battery is further improved.

Embodiments described herein relate to electrochemical cells with multiple separators, and methods of producing the same. A method of producing an electrochemical cell can include disposing an anode material onto an anode current collector, disposing a first separator on the anode material, disposing a cathode material onto a cathode current collector, disposing a second separator onto the cathode material, and disposing the first separator on the second separator to form the electrochemical cell. The anode material and / or the cathode material can be a semi-solid electrode material including an active material, a conductive material, and a volume of liquid electrolyte. In some embodiments, less than about 10% by volume of the liquid electrolyte evaporates during the forming of the electrochemical cell. In some embodiments, the method can further include wetting the first separator and / or the second separator with an electrolyte solution prior to coupling the first separator to the second separator.

Embodiments described herein relate to electrochemical cells with multiple separators, and methods of producing the same. A method of producing an electrochemical cell can include disposing an anode material onto an anode current collector, disposing a first separator on the anode material, disposing a cathode material onto a cathode current collector, disposing a second separator onto the cathode material, and disposing the first separator on the second separator to form the electrochemical cell. The anode material and / or the cathode material can be a semi-solid electrode material including an active material, a conductive material, and a volume of liquid electrolyte. In some embodiments, less than about 10% by volume of the liquid electrolyte evaporates during the forming of the electrochemical cell. In some embodiments, the method can further include wetting the first separator and / or the second separator with an electrolyte solution prior to coupling the first separator to the second separator.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and particularly relates to a double-strategy modified high-nickel positive electrode material as well as a preparation method and application thereof. According to the double-strategy modified high-nickel positive electrode material, a high-nickel positive electrode material serves as a matrix, surface coating and bulk phase doping are achieved at the same time through competitive doping of main group elements, a coating layer is a fast ion conductor LiLaO2 nano layer, and a bulk phase doping element is Y. The fast ion conductor coating layer can provide an additional ion channel, promote conduction of ions on the surface of the positive electrode material, reduce interface impedance and improve the rate capability of the battery. The doping elements can optimize the crystal structure of the positive electrode material and can relieve stress generated in the charging and discharging process, so that phase change and structural degradation are reduced, and the structural stability of the positive electrode material is improved.

A modified nickel-based positive electrode material comprises a nickel-based positive electrode material matrix and a doping element doped in the nickel-based positive electrode material matrix, the electronegativity of the doping element is higher than that of lithium and transition metal elements in the nickel-based positive electrode material matrix, and the porosity of the material is 10%-20%. The preparation method comprises the following steps: mixing and sintering a positive electrode material precursor, a lithium source and a doping agent to obtain a sintered product; washing and drying the sintered product to obtain a washed product; and mixing the washed product with a coating agent, and sintering to obtain the modified nickel-based positive electrode material. The invention also discloses a lithium ion battery. In the modified nickel-based positive electrode material, a part of doped elements enter a lattice body of a nickel-based positive electrode material matrix, the electronegativity of the doped elements is larger than that of lithium and transition metal elements, the doped elements have higher covalence, higher bond strength and higher oxidation potential, lattice oxygen in the structure is stabilized, precipitation of the lattice oxygen is reduced, and therefore the structural stability of the material is improved.

The invention provides a lithium iron phosphate positive electrode material and a preparation method thereof, a positive plate and a preparation method thereof, and a secondary battery, the lithium iron phosphate positive electrode material has a low Fe-Li antiposition defect, the mass of the Fe-Li antiposition defect accounts for 0-2% of the total mass of the positive electrode material, and the ion diffusion coefficient of the Fe-Li antiposition defect is 10 <-13 >-10 <-6 > cm < 2 > / s. Compared with the prior art, the lithium iron phosphate positive electrode material prepared by the invention has good electronic conductivity, also has a very high lithium ion diffusion coefficient, is beneficial to improving the rate capability of the material, and also has a relatively low Fe-Li antiposition defect, so that the prepared lithium iron phosphate has higher capacity and is beneficial to improving the energy density of the battery.

The invention discloses a method for selectively extracting lithium from a positive electrode material / black powder of a waste lithium ion battery. Performing chlorination transformation on the waste lithium ion battery positive electrode material / black powder to obtain chlorination transformation slag; and then, leaching the chlorination transformation slag with water to obtain a lithium chloride solution and lithium extraction slag. And a lithium chloride solution obtained through primary leaching can be used as a leaching solution to circularly leach the chlorination transformation slag, and after Li < + > in the circulating leaching solution is fully enriched, a lithium precipitation reagent is added into the circulating leaching solution, so that the Li < + > is opened in a lithium salt precipitation form. The method has the advantages of low reaction temperature, high reaction efficiency, high valuable metal yield, low production cost and the like, and has a good application prospect.

The invention provides a positive electrode material, a positive electrode plate, a secondary battery and an electronic device, the positive electrode material comprises lithium manganese iron phosphate, the positive electrode material comprises a first element and a second element, the first element comprises at least one of a magnesium element, a nickel element, a cobalt element or a zinc element, and the second element comprises at least one of a titanium element or a zirconium element; the mass ratio of the first element to the second element is 1 to 20. The positive electrode material meets the characteristics, the dynamic performance and the cycle performance of the positive electrode material can be improved, and meanwhile, the positive electrode material has relatively high capacity.

The present application discloses a method for recycling and preparing lithium iron phosphate from waste lithium iron phosphate batteries, which comprises the following steps: oxidizing and acid-leaching the recycled lithium iron phosphate battery powder to obtain acid-leached lithium solution and iron-phosphorus filter residue; adjusting the pH of the acid-leached lithium solution for purification and concentration, adding a phosphorus source and adjusting the pH to 9.5 - 10.5 to obtain solution A; subjecting the iron-phosphorus filter residue to secondary acid-leaching, iron dissolution, adding a phosphorus source and adjusting the pH to 6.5 - 7.5 to obtain solution B; mixing solution A and solution B for coprecipitation reaction, and filtering to obtain lithium iron phosphate precursor and reaction mother liquor; subjecting the lithium iron phosphate precursor to anaerobic drying, mixing with a carbon source and sintering to prepare a carbon-coated lithium iron phosphate cathode material. The method provided by the present application has the advantages of short recycling path, few reaction by-products and environmental friendliness, and can recycle all components of lithium, iron and phosphorus in the waste lithium iron phosphate battery powder. At the same time, the by-product is ammonium sulfate, a high-quality fertilizer raw material, which has great application prospects.

The invention discloses a method for synthesizing a lithium nickel manganese oxide positive electrode material through rapid Joule thermal shock. The precursor is loaded on a conductive substrate for Joule thermal shock treatment, so that not only can rapid synthesis within several minutes be realized, but also the product has more oxygen vacancy defects due to the characteristic of rapid heating and cooling of Joule heat, and the number of the oxygen vacancy defects can be further changed by changing the Joule thermal shock treatment time; therefore, the Mn < 3 + > content and the disorder degree of the material structure are influenced, and the optimization of the electrochemical performance is realized. According to the invention, efficient and fine regulation and control of oxygen vacancy number, Mn < 3 + > content and structure disorder degree in the LiNi0. 5Mn1. 5O4 material can be realized, and the high-performance LiNi0. 5Mn1. 5O4 material with the capacity retention rate up to 90.8% after 500 cycles under 1C multiplying power and the capacity of 75mAh / g under 5C multiplying power can be synthesized.

The invention provides an aluminum-doped modified mixed sodium ferric phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of sodium ion batteries. The chemical formula of the aluminum-doped modified mixed sodium ferric phosphate positive electrode material is Na < 4.4 > Fe < 3.4 > Al < 0.1 > (PO4) < 2.5 > (P2O7) / C. The aluminum-doped modified mixed sodium ferric phosphate positive electrode material is obtained by doping Al < 3 + > into NFPP through a sol-gel method and then carrying out high-temperature roasting. When the aluminum-doped modified mixed sodium ferric phosphate positive electrode material is used for a positive electrode of a sodium-ion battery, the initial capacity is high, excellent cycling stability and high rate performance are shown, and the reversible capacity is 133 mAh.g <-1 > under the current density of 0.2 C; under the current density of 20C, the capacity retention ratio is 99% after 500 cycles; and under the high current density of 50C, the capacity retention ratio is still 88% after 2500 cycles.

A method of synthesis of single crystal nickel-rich cathode materials can include preparing a precursor solution by dissolving lithium nitrate, nickel nitrate, manganese nitrate, and cobalt nitrate in water, aerosolizing the solution of a) in a stream of air using an ultrasonic sprayer, preheating the resulting droplets, premixing the droplets with methane, decomposing the droplets by passing through a co-flow burner, depositing solid particles on a filter, and calcinating the solid particles in a furnace in oxygen to produce a single crystal cathode material.

Compounds, particles, and cathode active materials that can be used in lithium ion batteries are described herein. Methods of making such compounds, powders, and cathode active materials are described. The particles have a particle size distribution with a D50 ranging from 10 μm to 20 μm.

The invention relates to a process for recycling and regenerating a waste lithium iron phosphate positive electrode material by using a specific chelating agent. The method comprises the following steps: carrying out heat treatment on a waste lithium iron phosphate positive electrode material, putting separated waste lithium iron phosphate powder into a ball milling tank, adding organic acid and a chelating agent, and carrying out ball milling; after the ball milling is finished, adding hydrogen peroxide, uniformly stirring and mixing, adjusting the pH value to 2-3 by using nitric acid, and filtering to obtain a filter cake which is iron phosphate; adding saturated sodium carbonate into the filtrate, precipitating, and recovering lithium carbonate; putting the iron phosphate, the lithium carbonate, the iron source, the lithium source and the phosphorus source in the step S3 into a ball mill for ball milling, and performing high-temperature solid-phase sintering after ball milling to obtain a regenerated lithium iron phosphate material; the chelating agent disclosed by the invention is prepared from (9ci)-2-(2-propenyl)-1-cyclopentene-1-carboxylic acid, 2-mercaptobenzimidazole carboxylic acid, an ethylene boric anhydride pyridine complex and potassium persulfate. The regenerated lithium iron phosphate material prepared by the method has excellent electrochemical performance.