727 results about "Lithium hydroxide" patented technology

The invention discloses high-purity lithium sulfide as well as a preparation method and application thereof. The preparation method comprises the step that lithium hydride, lithium hydroxide and a sulfur source are subjected to a heating reaction in a dry inert atmosphere, and the high-purity lithium sulfide is obtained. The molar ratio of lithium hydride to lithium hydroxide is X: (10-X), and X is 1-6. The invention also discloses the prepared high-purity lithium sulfide and application of the high-purity lithium sulfide in preparation of sulfide solid electrolyte. Lithium hydroxide and lithium hydride are mixed to serve as a lithium source in lithium sulfide preparation, the lithium hydroxide quickly and uniformly reaches the reaction temperature by means of the characteristic that the lithium hydride reacts with a sulfur source to release heat and produce gas, the lithium hydride reacts to produce gas, meanwhile, discharging of product water vapor is facilitated, and oxygen in the environment is isolated; and hardening and generation of a side reaction product lithium sulfate are prevented, the conversion rate of lithium hydroxide to lithium sulfide is improved, and the raw material and process cost for preparing lithium sulfide is remarkably reduced.

The invention discloses a chitosan modified lithium iron phosphate and carbon composite positive electrode material and a preparation method thereof.The preparation method comprises the steps that 1, lithium hydroxide, phosphoric acid and ferrous sulfate heptahydrate are mixed to prepare a uniform and stable solution, and a lithium iron phosphate precursor is prepared through a solvothermal method; step 2, dissolving chitosan in an acetic acid aqueous solution, and magnetically stirring under a water bath condition until the chitosan is completely dissolved to prepare a chitosan solution; and 3, adding the lithium iron phosphate precursor into a chitosan solution, uniformly mixing, carrying out ball milling and freeze drying, and carrying out high-temperature carbonization treatment in an inert gas to obtain the chitosan modified lithium iron phosphate and carbon composite positive electrode material. The method is simple to operate, low in cost and uniform in product particle size distribution.

The invention belongs to the technical field of lithium battery materials, and particularly relates to a preparation method of high-purity lithium sulfide. Comprising the following steps: putting lithium hydroxide and pure water into a reaction kettle, replacing air in the reaction kettle with nitrogen, starting the reaction kettle, and stirring and heating; introducing quantitative hydrogen sulfide gas from the bottom of the reaction kettle, and circulating the gas in the reaction kettle between liquid in the reaction kettle and a gas space through a gas circulating pump; and after the temperature of the reaction liquid in the kettle is reduced to 20-30 DEG C, filtering in a nitrogen atmosphere, washing the residual solid with quantitative ammonia water, transferring the filtered solid into a drying box, and purging and drying with nitrogen until no water exists, thereby obtaining the high-purity lithium sulfide. In the solvent method, water is used for replacing an organic solvent for reaction, the problems of organic solvent separation and recovery, hazardous waste treatment and the like are avoided, the cost is reduced, and the method is environment-friendly.

The invention discloses a production process of high-purity lithium oxide, and relates to the technical field of lithium oxide preparation. The production process of the high-purity lithium oxide comprises the following steps: mixing lithium hydroxide and hydrogen peroxide with the mass concentration of 90-99%, and carrying out peroxidation reaction to obtain a mixture containing lithium peroxide and lithium hydroxide; carrying out solid-liquid separation on the mixture containing the lithium peroxide and the lithium hydroxide to obtain a supernatant containing the lithium hydroxide and a solid containing the lithium peroxide; and carrying out drying treatment on the supernatant containing the lithium hydroxide to obtain the recycled lithium hydroxide, and carrying out thermal decomposition on the solid containing lithium peroxide in an inert gas protective atmosphere to obtain the high-purity lithium oxide powder. According to the technical scheme, the high-purity lithium oxide is prepared by adopting a process of peroxidizing lithium hydroxide into lithium peroxide and then carrying out thermal decomposition, the powder can be obtained without grinding, and the method has the advantages of high production efficiency, low energy consumption and high raw material utilization rate.

To provide a method which enables inexpensive production with a high yield of lithium hydroxide with a low amount of impurities such as sodium from lithium-containing water including a lithium ion and a chloride ion.SOLUTION: A production method of lithium hydroxide includes: a crystallizing step of crystallizing lithium hydroxide (LiOH) from lithium-containing water including a lithium ion and a chloride ion; a solid-liquid separation step of performing solid-liquid separation treatment of concentrated liquid including the LiOH to obtain the LiOH as a solid product and filtrate; a carbonation step of producing lithium carbonate from the filtrate by carbonation; a lithium carbonate recovery step of evaporating at least a part of ammonia from a mixed liquid obtained in the carbonation step and performing solid-liquid separation treatment of the resultant treated liquid to obtain lithium carbonate as a solid product; a lithium hydroxide production step of converting the obtained lithium carbonate into LiOH followed by solid-liquid separation treatment to obtain an aqueous LiOH solution (1) as a liquid component; and a recrystallizing step of crystallizing LiOH from the aqueous solution (1).SELECTED DRAWING: Figure 2

The invention relates to lithium sulfide and a preparation method thereof.The preparation method includes the following steps that sublimed sulfur powder and a lithium source are mixed and subjected to a heating reaction, and the lithium source comprises at least one of anhydrous lithium hydroxide, lithium hydroxide monohydrate, lithium oxide, lithium hydride and lithium carbonate; a reducing gas is introduced while the heating reaction is performed, or the reducing gas is introduced after the heating reaction is finished, and a reduction reaction is performed; and after the reaction is finished, introducing protective gas for calcining to prepare the lithium sulfide. The preparation method provided by the invention can realize low-cost and high-purity production of lithium sulfide, and ensures the safety and environmental protection of the production process.

The invention relates to an organic eutectic salt modified, regenerated and repaired waste lithium nickel cobalt manganate positive electrode material and a method, and the method comprises the following steps: uniformly mixing the waste lithium nickel cobalt manganate positive electrode material, an aluminum doping source and an organic eutectic salt to obtain mixed powder; the organic eutectic salt is a mixture of lithium hydroxide, lithium nitrate and lithium salicylate; carrying out primary calcination on the mixed powder, cooling, washing and drying to obtain a primary calcined material; and adding a lithium supplement agent into the primary calcined material, uniformly mixing, and carrying out secondary calcination to obtain the regenerated nickel cobalt lithium manganate positive electrode material. According to the method, the characteristics of high lithium ion concentration and low melting point of the organic eutectic salt are utilized, meanwhile, the organic eutectic salt can be used for modifying, regenerating and repairing the waste lithium nickel cobalt manganese oxide positive electrode material under the matching action of the aluminum doping source, and the method is simple, short in process, easy in raw material obtaining and suitable for industrial application; the regeneration effect is excellent, the initial capacity of the regenerated material is high, and the cycling stability is excellent.

The invention belongs to the technical field of industrial solid waste resource utilization and high-temperature CO2 adsorption materials, and provides a lithium orthosilicate-based CO2 high-temperature adsorbent prepared on the basis of synergistic treatment and synergism of various industrial wastes, and a method and application of the lithium orthosilicate-based CO2 high-temperature adsorbent. The preparation method comprises the following steps: separating, washing and drying to obtain a SiO2-containing hybrid solid product, mixing the SiO2-containing hybrid solid product with lithium battery derived lithium hydroxide, anhydrous citric acid and deionized water, drying to obtain a lithium silicate precursor, and finally roasting to obtain the lithium orthosilicate-based CO2 high-temperature adsorbent. Under the condition that the temperature window is 650-720 DEG C, the adsorption capacity of the adsorbent for high-concentration carbon dioxide can reach 18% or above, and part of the temperature can reach 30% or above. Most of the raw materials are selected from industrial wastes, and the preparation method has the characteristics of low cost and suitability for continuous production of process steps, and has industrial production prospects.

The invention relates to a method for simultaneously preparing lithium hydroxide and sulfuric acid. The invention provides a method for simultaneously preparing lithium hydroxide and sulfuric acid, which comprises the following steps: preparing a bipolar membrane electrodialysis device which comprises a first bipolar membrane, an anion exchange membrane, a cation exchange membrane and a second bipolar membrane, and forming an acid chamber between the first bipolar membrane and the anion exchange membrane, a salt chamber is formed between the anion exchange membrane and the cation exchange membrane, and an alkali chamber is formed between the cation exchange membrane and the second bipolar membrane; a lithium sulfate aqueous solution is added into a salt chamber of the bipolar membrane electrodialysis device, a sulfuric acid aqueous solution is added into an acid chamber, and a lithium hydroxide aqueous solution is added into an alkali chamber; and discharging the desalted solution formed in the salt chamber of the bipolar membrane electrodialysis device, discharging the sulfuric acid aqueous solution formed in the acid chamber, and discharging the lithium hydroxide aqueous solution formed in the alkali chamber.

The present invention provides a method for preparing lithium sulfide and lithium sulfide, so as to prepare a high-purity lithium sulfide without increasing the purification cost. The method includes: keeping thiourea and lithium hydroxide warm under a first condition to obtain a mixture; wherein, the first condition includes a heat preservation temperature of 130-180 °C; reacting the mixture with hydrogen sulfide under a second condition to obtain lithium sulfide; wherein, the second condition includes a temperature condition of 500-760 °C.

The invention discloses a method for converting lithium hydroxide into lithium carbonate. The method comprises the following steps: S1, preparing or taking a lithium hydroxide solution and a carbonate solution; s2, putting the lithium hydroxide solution and the carbonate solution into electrodialysis equipment, and carrying out electrodialysis treatment; and S3, after electrodialysis is finished, collecting a lithium carbonate solution, and sequentially carrying out lithium precipitation and solid-liquid separation on the lithium carbonate solution to obtain the battery-grade lithium carbonate. According to the method for converting lithium hydroxide into lithium carbonate disclosed by the invention, CO2 is replaced by carbonate, so that the generation of lithium bicarbonate is avoided, the lithium carbonate and the byproduct alkali liquor are directly obtained, the raw material source is wide, the preparation condition is mild, the production cost is greatly reduced, and the method has huge potential economic benefits.

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

The present invention relates to a method for preparing lithium sulfide, according to the present invention, when preparing lithium sulfide by a reaction between a lithium raw material and hydrogen sulfide, the reaction is carried out under relatively mild conditions compared to the prior art, so that frequent maintenance or replacement due to corrosion and failure of a reactor and various pipes is not required, thereby improving the economical efficiency of the process. Further, by reusing the unreacted hydrogen sulfide from which moisture has been removed and the solvent, process costs can be reduced, and economical efficiency can be ensured during mass production. Furthermore, moisture and water vapor generated in the lithium sulfide generation reaction are effectively removed, thereby preventing a reverse reaction for generating lithium hydroxide, promoting a positive reaction, and producing high-quality lithium sulfide with high purity and high yield. In addition, the particle size can be adjusted in units, and a separate pulverizing space or pulverizing table is not required, so that convenience and mass productivity are excellent.

The invention discloses a lithium hydroxide granulation process of a carbon dioxide absorbent, and relates to the technical field of lithium hydroxide granulation, uniform particle size distribution is beneficial to dispersion and reaction uniformity in the subsequent processing process, the problem of inconsistent product performance caused by particle size difference is avoided, and the test of a universal material testing machine shows that the lithium hydroxide granulation process can be used for preparing lithium hydroxide granules. The average compressive strength of the prepared lithium hydroxide particles is 5N / particle, and the lithium hydroxide particles have better mechanical strength, are not easy to break in the storage, transportation and industrial processing processes, can effectively reduce the generation of dust, reduce the risk of environmental pollution, ensure the quality stability of the product and meet the basic requirements on the particle strength in actual production. After the product is placed in an environment with the humidity of 70% for 24 hours, the weight gain rate of the particles is increased by 50-70%, and compared with ungranulated powdery lithium hydroxide, the hygroscopicity is remarkably improved, which is benefited from the micropore loose structure of the particles and the protective effect of the binder, the storage stability of the product in a humid environment is effectively improved, and the absorption function of the product on carbon dioxide in air is increased.

The invention belongs to the technical field of lithium ion battery electrode materials, and particularly discloses a diameter-controllable one-dimensional lithium manganate nanorod as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing manganese sulfate, potassium permanganate, a structure-directing agent and a surfactant into a solvent, and carrying out hydrothermal reaction to obtain a black precipitate; sintering the black precipitate to obtain a manganese dioxide nanorod; and mixing the manganese dioxide nanorod with lithium hydroxide, and carrying out two-stage sintering to obtain the one-dimensional lithium manganate nanorod. The prepared lithium ion battery anode material is uniform in thickness and very small in surface energy, can effectively shorten the transmission path of lithium ions when being used as an anode material, is not easy to agglomerate, has good flexibility, can maintain the structural integrity in a large-current long-time service process, and is beneficial to improving the rate and cycle performance of an electrode. In addition, by adjusting the concentration of potassium permanganate and the hydrothermal reaction temperature, the diameter of manganese dioxide can be accurately adjusted, and controllable preparation of one-dimensional lithium manganate is realized.

The invention discloses a synthesis method of lithium difluoro (oxalato) borate. The synthesis method comprises the following operation steps: S1, introducing negative ions SF < 6-> into a triethyl boron (CH2CH3) 3B solution, and carrying out a primary reaction; s2, oxalic acid is added for an intermediate reaction; s3, lithium hydroxide is added for a final reaction, and a final reaction product lithium difluoro (oxalato) borate LiC2O4BF2 is generated; the preparation process is efficient, simple and environment-friendly, and is suitable for serving as a synthesis process route for realizing industrial large-scale production of lithium difluoro (oxalato) borate, and the large-scale industrialization level of the electrolyte additive is further improved.

The present invention provides a method for producing lithium hydroxide, comprising the steps of reacting lithium carbonate and calcium hydroxide in a liquid to obtain a solution containing lithium hydroxide, and performing solid-liquid separation on the solution into a liquid component containing lithium hydroxide and a solid component containing lithium derived from the lithium carbonate, and recovering lithium hydroxide from the liquid component.

The invention discloses a lithium supplement agent, a preparation method thereof and a battery, and belongs to the technical field of battery materials. The lithium supplement agent comprises a porous spongy substrate and lithium salt filled in the surface and pores of the porous spongy substrate, wherein the porous spongy substrate contains a thickening agent, conductive carbon black and a modified catalyst. The modified catalyst is obtained by sintering at least three of cobalt nitrate, nickel nitrate, calcium nitrate and titanium dioxide with graphene or carbon nanotubes; the lithium salt comprises at least two of lithium hydroxide, lithium carbonate and lithium oxalate. The lithium supplement agent is stable in structure, the first sufficient solution voltage can be as low as 4.0 V, and the preparation method is simple and suitable for large-scale production.

The invention discloses a method for in-situ lossless repair of an attenuated lithium manganate positive electrode material, which specifically comprises the following steps: adding the attenuated lithium manganate material into a lithium hydroxide solution, supplementing lithium to an original value by a hydrothermal method, repairing the component and structure defects of attenuated LiMn2O4 by combining high-temperature roasting, and recycling and regenerating lithium manganate particles with severely attenuated capacity. The lithium manganate positive electrode material is directly recovered by the lossless method, and the chemical components and crystallinity of the invalid positive electrode material in various health states are reconstructed, so that the invalid positive electrode material can be repeatedly used in the lithium ion battery. Finally, the treated recycled powder material is coated by a metal organic framework (MOFs) self-assembly method, so that the electrochemical performance of the treated powder material is further improved. The method is simple, environmentally friendly and low in energy consumption, has obvious advantages compared with a traditional hydrometallurgy battery recovery method, and lays an important foundation for sustainable manufacturing of energy materials.

The invention discloses a lubricating grease composition I and a lubricating grease composition II, wherein the lubricating grease composition I is used as a raw material of the lubricating grease composition II. The lubricating grease composition I comprises 60-90 parts of base oil, 5-20 parts of a fatty acid composition, 2-5 parts of lithium hydroxide, 2-6 parts of modified nano boron nitride and 5-15 parts of an additive; wherein the viscosity of the base oil at 40 DEG C is 30-60 mm < 2 > / s, and the base oil is prepared by compounding and mixing 60%-90% w / w of poly-alpha-olefin synthetic oil (PAO) and the balance of synthetic ester (POE) belonging to V-type synthetic oil; the fatty acid composition is prepared from 12-hydroxystearic acid and unsubstituted C14-C20 saturated long-chain fatty acid, wherein the mass of the 12-hydroxystearic acid is 1 to 10 times that of the unsubstituted C14-C20 saturated long-chain fatty acid; the modified nano boron nitride is oleamide modified nano boron nitride; the additive is selected from at least one of an antioxidant, an anti-rust agent and an extrusion anti-wear agent. The invention also discloses application of the lubricating grease composition II as lubricating oil in lubrication of axle box bearings of high-speed railway trains with the speed of not less than 400km / h.

The invention discloses an oxidation-resistant monomer casting nylon material and a preparation method thereof, and relates to the field of material preparation, and the monomer casting nylon material is applied to a high-temperature and oxygen-enriched environment and comprises the following components in parts by mass: 100 parts of caprolactam; 0.1-0.3 part of a catalyst which is one of sodium hydroxide, potassium hydroxide or lithium hydroxide; 0.5 to 1.5 parts of an activating agent, wherein the activating agent is N-acetyl caprolactam; 0.7 to 3 parts of a main antioxidant, wherein the main antioxidant comprises a hindered phenol antioxidant and a thioester antioxidant; 0.1-0.5 part of an auxiliary antioxidant, which is a metal deactivator; 1-3 parts of an inorganic filler which is modified montmorillonite; and 0.5-2 parts of a hydrophobic agent which is a silane coupling agent. By constructing a composite anti-oxidation system, multi-level synergistic protection can be formed for three key oxidation stages of free radical initiation, peroxide accumulation and metal catalysis, and a full path of an oxidation chain reaction is covered from a molecular level, so that the aging process of the material is remarkably delayed, and the service life of the material is prolonged. And high oxygen resistance and relatively long service life are provided for nylon application under severe working conditions.

The invention discloses a corrugated plate-shaped lithium hydroxide absorbent as well as a preparation method and application thereof, an absorbent bed layer can be naturally formed by arranging multiple layers of stacked corrugated plates with gaps, and when carbon dioxide is absorbed, pressure drop can be formed in the gaps, so that the absorption rate is ensured; meanwhile, the formula of the absorbent ensures certain strength and porosity, and dust escape is reduced while the absorption rate is ensured.

The invention belongs to the technical field of electrochemistry, and particularly relates to a carboxyl lithium porphyrin supramolecular fast-charging negative electrode material of a lithium ion battery as well as a preparation method and application of the carboxyl lithium porphyrin supramolecular fast-charging negative electrode material. The method comprises the following steps: uniformly stirring and dispersing tetra (4-carboxyphenyl) porphyrin TCPP and a lithium hydroxide alkali solution; reacting the solution for several hours under a constant temperature condition to obtain a carboxyl lithiated carboxyl lithium porphyrin TCPP-Li solution; after cooling, dropwise adding a reagent into the solution, carrying out suction filtration, and washing with the reagent for multiple times; and filtering, collecting and drying in vacuum to obtain the high-crystallization self-assembled carboxyl lithium porphyrin SA-TCPP-Li material. The lithium ion battery constructed by using the negative electrode material provided by the invention shows excellent rapid charging capability, and can realize the ultra-long service life of about 30,000 cycles under the ultra-high current density of 10A. G, and the capacity fading can be ignored.

The invention relates to the technical field of preparation of a lithium ion battery positive electrode lithium supplement agent, in particular to preparation of a composite lithium supplement agent, which comprises the following steps: dissolving lithium hydroxide and oxalic acid in pure water to prepare a lithium oxalate saturated solution, and adding a metal catalyst; preparing lithium oxalate particles from the lithium oxalate saturated solution containing the metal catalyst through a spray dryer in an inert atmosphere; the lithium oxalate particles are put into a CVD rotary furnace, organic steam is introduced, the organic steam is decomposed through a metal catalyst to generate carbon, and the carbon is deposited on the surface of lithium oxalate; reducing the temperature of the CVD rotary furnace, introducing a silicon source, introducing water vapor, and coating the surface of the material with a SiO2 film; and reducing the temperature of the CVD rotary furnace, introducing a modifier, and carrying out a cross-linking reaction on the modifier and the surface of the material to obtain the final product Li2C2O4 (at) C (at) SiO2 (at) CF3. According to the invention, the defects of lithium oxalate insulation, high decomposition voltage and poor air stability are overcome.

Black mass from disused lithium batteries is leached for recovery of various metals in a process that includes precipitation, solvent exchange, ion exchange, and salt splitting to create multiple product streams for recovery of pure value products. Most typically, the process is a closed-loop process and allows for production of metallic cobalt and nickel, EMD, and a high purity lithium hydroxide or carbonate product with minimal generation of waste streams.

The invention discloses micro-powder-grade lithium sulfide as well as a preparation method and application thereof. The preparation method comprises the following steps: heating lithium hydroxide to an impurity removal temperature under a vacuum condition, and preserving heat to obtain molten lithium hydroxide; the method comprises the following steps: transferring molten lithium hydroxide into reaction equipment, continuously introducing mixed gas containing hydrogen sulfide into the molten lithium hydroxide from a gas inlet at the bottom of the reaction equipment, carrying out stirring reaction at the temperature of 470-650 DEG C, discharging a reaction product into a high-temperature centrifugal machine after the reaction is finished, and centrifuging at the temperature of 500-600 DEG C, so as to obtain the hydrogen sulfide-containing lithium hydroxide. The lithium hydroxide melt obtained through centrifugation is returned to the reaction equipment, and the precipitate obtained through centrifugation is micro-powder-grade lithium sulfide. According to the method, molten lithium hydroxide and hydrogen sulfide gas are subjected to a reaction, lithium sulfide generated through the reaction is high in melting point and can be separated out in the form of small particles, and then the lithium sulfide can be separated from unreacted lithium hydroxide melt through high-temperature centrifugation.

The invention relates to the field of preparation of new energy lithium ion battery positive electrode materials, in particular to hexagonal prism-like morphology lithium manganese iron phosphate and a preparation method thereof.The preparation method comprises the following steps that a proper amount of lithium hydroxide, deionized water, 85% phosphoric acid solution, manganese sulfate monohydrate and ferrous sulfate heptahydrate are taken and mixed, and a reaction solution is prepared; introducing the obtained reaction solution into a polytetrafluoroethylene lining, putting the polytetrafluoroethylene lining into a hydrothermal kettle, carrying out hydrothermal treatment at 100-240 DEG C for 10-18 hours, and then taking out the polytetrafluoroethylene lining; centrifugally washing the taken-out polytetrafluoroethylene lining with water for three times, and drying the obtained lithium manganese iron phosphate product in a drying oven to obtain light yellow powder for later use; and uniformly mixing the obtained light yellow powder with glucose, carrying out ball milling, transferring into a graphite ark, feeding into a high-temperature tube furnace, and carbonizing and coating a carbon layer to obtain the black lithium manganese iron phosphate. According to the invention, the lithium manganese iron phosphate with the hexagonal prism-like morphology is obtained, and the lithium manganese iron phosphate shows excellent electrochemical performance.

Disclosed are a quenching solution, a method for manufacturing a surface-stabilized Li-rich manganese-based positive electrode material, and a secondary battery. The quenching solution contains a solvent, a lithium hydroxide or lithium salt, a reducing agent, and a phosphate, and the Li-rich manganese-based positive electrode material is treated by a quenching method in the quenching solution, thereby improving the initial coulombic efficiency and cyclic stability of the battery and alleviating voltage decay.

The invention discloses a doped modified ternary positive electrode material, a preparation method thereof and a battery, and belongs to the technical field of batteries and ternary materials. The preparation method comprises the following steps: respectively weighing Ni0. 8Co0. 1Mn0. 1 (OH) 2, lithium hydroxide and a doping agent according to a molar ratio, mixing and grinding to form a mixture; and calcining the mixture in sections in an oxygen atmosphere, grinding and sieving to obtain the doped and modified ternary positive electrode material. The high-nickel ternary material is doped with a proper amount of Ti and V, and the Ti and V have a synergistic effect, so that the stability of the material structure is improved, the cation mixing degree is reduced, the reversible degree of the material and the reaction kinetics are improved, and the electrochemical performance of the material is improved.

The invention relates to the technical field of lithium ion batteries, and provides a method for preparing lithium iron phosphate by using a titanium dioxide byproduct ferrous sulfate and application. The invention relates to a method for preparing lithium iron phosphate by using a titanium dioxide byproduct ferrous sulfate, which comprises the following steps: dissolving the titanium dioxide byproduct ferrous sulfate, adding a purifying agent for purification treatment, and filtering to obtain a purified ferrous sulfate solution; the purified ferrous sulfate solution serves as electrolyte, Fe < 2 + > is partially oxidized into Fe < 3 + >, phosphoric acid is added into the obtained mixed valence iron solution, the pH is adjusted, and iron phosphate precursor slurry is formed through aging; mixing the iron phosphate precursor slurry with an ethanolamine-water mixed solution of lithium hydroxide, and carrying out a reaction in a microwave reactor to obtain a lithium iron phosphate precursor suspension; and crystallizing the lithium iron phosphate precursor, and simultaneously introducing a carbon source steam and a silicon source steam to carry out gas-phase surface modification to obtain the lithium iron phosphate material. According to the invention, the raw material purity is improved, the powder structure is improved, and the long-cycle stability is improved.