252 results about "Manganate" patented technology

The application relates to the technical field of material preparation, and discloses multi-element carbon-coated lithium manganate, a preparation method thereof and a secondary battery. The multi-element carbon-coated lithium manganate comprises a lithium manganate core and a carbon nanotube layer and a hard carbon layer which are sequentially coated on the lithium manganate core. The chemical formula of the lithium manganate core is LiAl a X b Mn 2‑a‑b O4, wherein 0.01<=a<=0.10, 0.01<=b<=0.05, and X comprises at least one of Co, Cr, Ti, V and B. The preparation method of the multi-element carbon-coated lithium manganate comprises the following steps: (I) preparing doped lithium manganate, (II) preparing carbon nanotubes and (III) multi-element carbon coating. The multi-element carbon-coated lithium manganate has high conductivity, rate performance, cycle performance and safety performance, and can be used as an alternative positive electrode material with high cycle and excellent fast-charging performance.

The invention discloses an electrolyte for a lithium manganate lithium ion battery and a preparation method thereof, and the electrolyte comprises the following components in percentage by mass: 70-90% of an organic solvent, 5-20% of a lithium salt and 0.5-10% of an additive, the organic solvent is formed by mixing cyclic carbonate and chain carbonate according to the mass ratio of (10-30): (70-90); the lithium salt adopts one or more of lithium hexafluorophosphate (LiPF), lithium tetrafluoroborate (LiBF) and lithium bis (trifluoromethane sulfonimide) (LiTFSI), and the concentration of the lithium salt is 0.8 to 1.5 mol / L; the additives comprise a manganese ion complexing agent, a film forming accelerant and an antioxidant. In the invention, the manganese ion inhibition effect is as follows: the complexing agent and Mn (II) ions form a stable complex, so that the concentration of free Mn (II) in the electrolyte is reduced by more than 80%, migration and deposition of the free Mn (II) to the negative electrode are inhibited, and the dissolution amount of the Mn element of the positive electrode is reduced by 65% after 500 times of circulation at 45 DEG C.

The invention provides an electrochemical device and an electronic device comprising the same, the electrochemical device comprises a positive pole piece, the positive pole piece comprises a current collector and a positive pole material layer located on at least one surface of the current collector in the thickness direction, the positive pole material layer comprises a first positive pole material layer and a second positive pole material layer, the second positive electrode material layer is located between the first positive electrode material layer and the current collector, the positive electrode material layer comprises a positive electrode active material, the positive electrode active material comprises two or more than two nickel cobalt lithium manganate ternary materials, the two or more than two nickel cobalt lithium manganate ternary materials are divided into two groups, the chemical formula of the first group of lithium nickel cobalt manganate ternary materials is Lin1Nix1Coy1Mnz1M1m1O2, x1 + y1 + z1 + m1 is equal to 1 and smaller than or equal to 0.60, the chemical formula of the second group of lithium nickel cobalt manganate ternary materials is Lin2Nix2Coy2Mnz2M2m2O2, x2 + y2 + z2 + m2 is equal to 1 and larger than 0 and smaller than or equal to 0.14, and the two groups of lithium nickel cobalt manganate ternary materials are located in the first positive electrode material layer and the second positive electrode material layer respectively.

The invention belongs to the technical field of energy materials, and provides a multi-functional-layer lithium manganate positive electrode material and a preparation method thereof and a lithium battery, the multi-functional-layer lithium manganate positive electrode material comprises a core body and a coating layer, the core body sequentially comprises a bulk-phase-doped lithium manganate matrix, an induction doping layer and a modification doping layer from inside to outside, the chemical general formula of the core body is Li < 1 + a > Mn < 2-b-c-d > M R < c > X < d > O < 4-e > Z < e >, bulk phase doping elements of the matrix are M and Z, a crystal face induction element is X, and a modification doping element is R; the coating layer is a compound comprising a coating element M '; a supported crystal face inducer is also adopted for further inhibiting the growth of the crystal face (111) and reducing the area of the crystal face (111) so as to form the positive electrode material of a polyhedral spinel crystal structure comprising at least 26 crystal faces, and the crystal face inducer comprises a phosphorus-containing compound, a boron-containing compound or at least + 5 valence metal salt; the Mn dissolution reaction is reduced, and the electrochemical performance of the lithium manganate is improved.

The invention provides a composite lithium manganate positive electrode material, a preparation method thereof, a pole piece and a battery, and relates to the technical field of lithium batteries. The composite lithium manganate positive electrode material is of a core-shell structure; the core is lithium manganate, and the shell is a composite coating layer coating the surface of lithium manganate; the composite coating layer comprises a first coating layer and a second coating layer; the first coating layer is CuCe < x > Fe < 2-x > O < 4-y > Li; and the second coating layer comprises PVDF particles. The invention provides a lithium manganate material with a double-layer core-shell structure. The CuCexFe2-xO4-yLi inner layer reduces impedance and stabilizes crystal lattices by virtue of spinel isomorphism and doping, and anchors the PVDF outer layer based on oxygen vacancy; and in cooperation with the surface lithium gradient effect, the structural stability and electrochemical performance of the material are remarkably improved.

The invention relates to the field of lithium manganate positive electrode materials, in particular to a lithium manganate positive electrode material and a preparation method thereof, a positive electrode plate and a battery, which are used for solving the problems of Jahn-Teller distortion of Mn < 3 + >, Mn dissolution and low conductivity in circulation. Lithium carbonate, manganous-manganic oxide, potassium carbonate, aluminum nitrate and absolute ethyl alcohol are subjected to ball milling and then sintered to obtain K / Al co-doped lithium manganate powder, then the K / Al co-doped lithium manganate powder is coated with an acetylferrocene / diphenylamine polymer, finally, the K / Al co-doped lithium manganate powder is coated with an AlF3 (at) CeF3 suspension, and finally the lithium manganate positive electrode material is obtained. According to the lithium manganate positive electrode material, the electronic conductivity is greatly improved, the rate capability is improved, and the cycling stability is improved; and the material has excellent cycling stability and rate capability.

The invention discloses a preparation method for recycling and regenerating a Mo / F co-doped manganese-sodium-rich electric ternary positive electrode material from a waste nickel cobalt lithium manganate positive electrode, and relates to a method for synthesizing and regenerating a Mo / F co-doped layered nickel cobalt manganese oxide manganese-rich (Na < 0.67 > Ni < 0.21 > Co < 0.1 > Mn < 0.67 > Mo < x > F < y > O < 2 >) ternary positive electrode material by recycling and reusing a waste power battery and application of the Mo / F co-doped manganese-sodium-rich electric ternary positive electrode material. The method comprises the following steps: leaching a waste ternary positive electrode material by a wet method, co-precipitating, calcining and regenerating to prepare the Mo / F co-doped sodium ion layered transition metal oxide positive electrode material (Na < 0.67 > Ni < 0.21 > Co < 0.1 > Mn < 0.67 > Mo < x > F < y > O < 2 >). An electrochemical test result shows that the positive electrode has excellent normal-temperature performance, and meanwhile, the problem of slow dynamics of the positive electrode at low temperature is broken through. According to the invention, the waste power battery positive electrode is recycled, and is regenerated and converted into the sodium ion battery positive electrode material with abundant raw materials through a modification strategy. A spinel surface layer is formed by introducing Mo / F, and the cycle performance of the layered transition metal oxide positive electrode material of the regenerated sodium-ion battery is improved through the synergistic effect of Mo / F. The preparation process is simple, high in operability, wide in raw material source, low in cost and suitable for large-scale production, and meets environmental requirements.

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 relates to a composite positive electrode material and a preparation method thereof, a positive plate and a battery in the technical field of lithium battery production. The composite positive electrode material comprises a core part of a lithium manganate positive electrode material and a coating layer positioned on the surface of the core part, the coating layer comprises a first coating layer and a second coating layer, and the first coating layer is positioned between the core surface of the lithium manganate positive electrode material and the second coating layer; the first coating layer is nickel cobalt lithium manganate (NCM), and the second coating layer is lithium iron phosphate (LFP). Through the synergistic protection effect of double-layer coating, the stability of the lithium manganate structure can be remarkably enhanced, and the high-temperature storage performance and the cycle performance of the battery cell are improved.

The application belongs to the field of lithium ion battery cathode material preparation, and particularly relates to a high-voltage type single-crystal lithium manganate, a preparation method and application thereof. The scheme mixes a manganese source compound, a lithium source compound and a transition metal oxide according to a molar ratio of 1:0.5-0.6:0.1-0.3, deoxidizes and sinter, to obtain a single-crystal lithium manganate intermediate product; the obtained intermediate product is used as a raw material to prepare a finished product; the deoxidizing and sintering operation is to raise the temperature from room temperature to 800-1000 DEG C at a temperature raising rate of 20-30 DEG C / min, and keep constant temperature for 2-6 h, no temperature keeping operation is performed in the temperature raising process, after the constant temperature stage is finished, the temperature is lowered to 400-500 DEG C at a temperature lowering rate of 50-100 DEG C / h, and keep constant temperature for 2-4 h, to prepare the high-voltage type single-crystal lithium manganate cathode material. The scheme can significantly improve the capacity and high-temperature cycle performance of the lithium manganate material, and inhibit the battery expansion rate, through fast temperature raising, gradient temperature lowering and the cooperation of radius-matched doping elements. Meanwhile, the application also provides application of the high-voltage type single-crystal lithium manganate cathode material in a battery.

The application belongs to the technical field of lithium ion batteries, and particularly relates to a carbon-nitrogen double-layer coated positive electrode lithium supplementing agent and a preparation method and application thereof. The preparation method of the carbon-nitrogen double-layer coated positive electrode lithium supplementing agent provided by the application is as follows: a carbon source such as sucrose, a nitrogen source such as melamine, and an iron source such as nano-iron oxide are uniformly mixed, and then one-step sintering is performed to make the mixture dehydrate; then in the second-step sintering, a lithium source such as pitch and lithium oxide (Li2O) is introduced to generate lithium ferrite (Li5FeO4), which effectively avoids water generated by dehydration of the carbon source such as sucrose and impurities generated by the reaction of lithium ferrite, improves the purity and performance of the positive electrode lithium supplementing agent, and meanwhile, the carbon-nitrogen double-layer coating can effectively coat the lithium ferrite and introduce nitrogen, thereby improving the stability, ion diffusivity and conductivity of the positive electrode lithium supplementing agent, so as to solve the technical problem of poor performance of the lithium manganate positive electrode lithium supplementing agent prepared by the existing preparation method.

Provided in the present disclosure is a positive electrode material, containing a positive electrode active material, a conductive agent and a binder, the positive electrode active material consisting of a positive electrode main material and a lithium supplementing agent, the positive electrode main material being selected from at least one of lithium iron phosphate and lithium manganese iron phosphate, and the lithium supplementing agent being selected from at least one of lithium manganate and a lithium-rich manganese-based material. On the basis of the total weight of the positive electrode active material, the mixing weight ratio of the positive electrode main material to the lithium supplementing agent is: 70:30≤positive electrode main material: lithium supplementing agent≤99.9:0.1. A positive electrode coating is formed by means of a double-layer synchronous coating process, the content of the lithium supplementing agent in the surface layer being a wt %, the content thereof in the bottom layer being b wt %, and the total content of the lithium supplementing agent in the positive electrode active material being within the range of 0.1-30%. Correspondingly, further disclosed in the present disclosure is a positive electrode pre-lithiated battery comprising the positive electrode material. The pre-lithiation technology for positive electrode materials of lithium-ion batteries provided by the present disclosure significantly improves the usable cycle capacity, rate capability and cycle stability of batteries, and has important application value and promotion prospects.

The invention discloses a lithium titanate battery, and relates to the technical field of batteries. The battery comprises a positive electrode, a negative electrode, an electrolyte and a diaphragm, and an addition product synthesized by dimethyl fumarate and benzidine according to a specific molar ratio is added into the electrolyte as a viscosity modifier, so that the viscosity increasing trend of the electrolyte at a low temperature is effectively reduced, and the migration rate of lithium ions is improved. And the electrolyte also comprises a lithium salt, an organic solvent and an auxiliary additive, so that the low-temperature performance and the cycling stability of the battery are favorably optimized. A positive active material is one or more of lithium iron phosphate, lithium manganate, lithium cobalt oxide or nickel manganese cobalt ternary materials, a negative active material is lithium titanate, and additives such as lithium nitrate and fluoroethylene carbonate are further combined, so that the capacity retention ratio and the charge-discharge efficiency of the battery in an extreme low-temperature environment of-40 DEG C are remarkably improved. The lithium titanate battery provided by the invention has excellent low-temperature adaptability, safety and long cycle life, and is applicable to power batteries and energy storage systems in alpine regions.

The invention relates to the technical field of lithium ion batteries, in particular to a nickel cobalt lithium manganate positive electrode material and a preparation method thereof. According to the invention, the technical problems of poor cycle performance and low specific capacity of the existing nickel cobalt lithium manganate positive electrode material are solved. The preparation method comprises the following steps: synthesizing precursor powder by adopting a coprecipitation process; then carrying out high-shear mixing on the precursor, lithium hydroxide, nano niobium oxide and magnesium fluoride; after the mixed material is subjected to pre-oxidation and high-temperature oxygen-enriched gradient sintering, a gradient reduction etching process is adopted in the cooling stage, and strong wind quenching is matched for surface shaping; and finally, carrying out air jet pulverization and demagnetization to obtain the nickel cobalt lithium manganate positive electrode material. According to the method, lattice respiration stress is effectively dissipated by constructing a radial ordered structure, a bulk phase structure is stabilized through multi-element synergistic doping, interfacial ion transport kinetics is optimized through reduction-induced surface oxygen vacancies and a lattice distortion layer, and the synergistic strategy ensures high stability of the material structure and meanwhile, the material structure has a good application prospect. And the de-intercalation efficiency of the active lithium is greatly improved.

The invention discloses a lithium manganate conductive material and a preparation method thereof, and the lithium manganate conductive material comprises a lithium manganate inner net layer which is a nano network layer formed by connecting lithium manganate crystal grains; the graphene and / or carbon nanotube conductive carbon outer net layer is deposited on the surface of the inner net layer. The lithium manganate crystal grains are uniform and fine, and the crystal grains are of a continuous net-shaped arrangement structure. Dissolving and mixing the polymer nanofiber, manganese salt, lithium salt and M-doped salt to form gel, drying, and carrying out two-stage programmed heating calcination in an oxygen-containing atmosphere to obtain a lithium manganate nano inner net layer; ultrasonically dispersing the lithium manganate nano inner net layer in water, adding acidified carbon nanotubes and / or graphene oxide dispersion liquid, and depositing the acidified carbon nanotubes and / or graphene oxide dispersion liquid on the surface of the inner net layer to form a conductive carbon outer net layer. The obtained lithium manganate conductive material has a continuous large-area two-dimensional network structure, shows high conductivity, high specific capacity and excellent cycling stability, and can be widely applied to the fields of lithium ion batteries, electrochemical lithium extraction, lithium ion adsorption and the like.

The application belongs to the technical field of inorganic nanometer material preparation, and particularly relates to a hollow manganese dioxide / cobalt manganate loaded nitrogen-doped carbon hybrid material and a preparation method thereof. The steps of the application are as follows: S1, dispersing manganese source material in N,N-dimethylformamide to form a uniform solution; S2, adding an organic ligand to the solution obtained in step S1 and continuously stirring to obtain a mixed solution, and then transferring the mixed solution to a reaction kettle for a solvothermal reaction; S3, sequentially washing and drying the product obtained through the solvothermal reaction, and then grinding the product and a cobalt salt to form a mixture powder; and S4, performing a high-temperature pyrolysis reaction on the mixture powder, and obtaining the hollow manganese dioxide / cobalt manganate loaded nitrogen-doped carbon hybrid material rich in mesopores and macropores after the reaction stops. The application has a large specific surface area and a multi-pore structure, slows down the migration and aggregation of metal particles and the loss of pyrolysis intermediates in the heat treatment process, and improves the electrochemical activity and stability of the transition metal / nitrogen-doped carbon electrocatalyst.

The invention discloses a preparation method and application of hollow lithium manganate microspheres based on a sound-induced microbubble template, and belongs to the field of lithium ion batteries. The method comprises the following steps: dissolving a surfactant in deionized water to prepare a surfactant solution with the concentration of 1-2g / L; high-power ultrasonic waves are applied to the surfactant solution, micron-sized bubbles are generated in the surfactant solution, and microbubble template liquid is obtained; adding manganese salt and an oxidizing agent into the microbubble template liquid under the continuous action of ultrasound, so that the manganese salt is oxidized at a gas-liquid interface of the micron-sized bubbles to form a hollow manganese dioxide precursor; centrifugally collecting, washing and drying to obtain hollow manganese dioxide microspheres; the hollow manganese dioxide microspheres and a lithium source are uniformly mixed and then subjected to segmented heat treatment, and the hollow lithium manganate microspheres are obtained after natural cooling, so that the problems that the template removal step is tedious, impurities are possibly introduced, the temporary template stability is poor, and the size distribution is non-uniform are solved.

The invention provides a positive electrode material, a positive electrode plate and a battery, the positive electrode material comprises ternary positive electrode particles, first lithium manganate particles and second lithium manganate particles, the first lithium manganate particles have an octahedral crystal structure, and the second lithium manganate particles have a spinel crystal structure. Through the synergistic effect of the ternary positive electrode particles, the first lithium manganate particles and the second lithium manganate particles, the compaction of the positive electrode material is improved, the compaction density, the energy density and the high temperature resistance of the positive electrode plate are further improved, and the cycle performance and the high-temperature storage performance of the battery are improved.

The application belongs to the technical field of lithium ion battery electrode materials, and specifically discloses a one-dimensional lithium manganate nanorod with controllable diameter and a preparation method and application thereof. The application disperses manganese sulfate, potassium permanganate, a structure directing agent and a surfactant into a solvent, carries out a hydrothermal reaction, and obtains black precipitate; then the black precipitate is sintered to obtain manganese dioxide nanorods; the manganese dioxide nanorods are mixed with lithium hydroxide, and two-stage sintering is carried out to obtain one-dimensional lithium manganate nanorods. The one-dimensional lithium manganate nanorods are uniform in thickness and have very small surface energy, when used as a positive electrode material, can effectively shorten the transmission path of lithium ions, are not prone to agglomeration and have good flexibility, can maintain the integrity of the structure during long-time service under a large current, and are beneficial to improving the rate and cycle performance of the electrode. In addition, by adjusting the concentration of potassium permanganate and the hydrothermal reaction temperature, the diameter of the manganese dioxide can be accurately adjusted, and the controllable preparation of the one-dimensional lithium manganate can be realized.

The invention discloses a modified nickel cobalt lithium manganate positive electrode material which comprises a nickel cobalt lithium manganate positive electrode material matrix and a perovskite coating layer Li [mu] W [alpha] Sr [beta] O [gamma] coating the surface of the nickel cobalt lithium manganate positive electrode material matrix. The preparation method comprises the following steps: mixing a precursor containing nickel, cobalt and manganese elements, a lithium salt, a W-containing compound, a Sr-containing compound and an M-containing compound, carrying out first sintering treatment, crushing and dissociating, mixing with the lithium salt, carrying out second sintering treatment, and screening to obtain the modified nickel cobalt lithium manganate positive electrode material. The invention also discloses a lithium ion battery comprising the positive electrode material and an electric device. According to the invention, the surface of the nickel cobalt lithium manganate positive electrode material substrate is coated with the perovskite coating layer, so that the problems of internal resistance, rate capability and low power of a low-Co material can be improved; the high-temperature cycle capacity retention ratio of the material under high charging cut-off voltage can be improved; and the problems of high-temperature storage internal resistance increase and gas production of the material under high charging cut-off voltage can be improved.

The application provides a surface-modified spinel lithium manganate positive electrode material and a preparation method and a lithium battery thereof, and the lithium battery is prepared by a solid-phase co-sintering method and a subsequent hydrothermal treatment method, and a core-shell structure with same composition elements but different element contents and valence states of the surface and the interior is obtained, wherein the inner core is spinel lithium manganate close to a stoichiometric ratio, and the surface is an amorphous lithium-manganese-oxygen layer with high lithium content and high manganese valence directly obtained through in-situ conversion; the lithium battery has better chemical bonding and mechanical stability, can effectively hinder the corrosion of electrolyte on the lithium manganate and inhibit the dissolution of Mn elements in the lithium manganate, and can remain stable in a long cycle process.

The invention discloses a multi-element doped and surface coated spinel lithium manganate material and a preparation method thereof, and belongs to the field of lithium ion battery positive electrode materials. The multi-element doped and surface coated spinel lithium manganate material comprises matrix particles and a lithium ion conductor coating layer located on the surfaces of the matrix particles, the chemical general formula of the matrix particles is LiMn < 1.91 > Al < 0.03 > Mg < 0.03 > Zr < 0.03O4 >, the component of the lithium ion conductor coating layer is a compound of Li < 1.3 > Al < 0.3 > Ti < 1.7 > (PO4) 3 and Li < 3 > BO < 3 >, the problems of capacity fading and manganese dissolution of a spinel type lithium manganate material in the prior art are solved.

The invention relates to a positive electrode active material and a preparation method thereof, a positive electrode and a lithium ion battery. The positive electrode active material comprises lithium manganate particles and a sodium phytate layer coating the surfaces of the lithium manganate particles. According to the technical scheme, in the positive electrode active material, the sodium phytate layer serves as a coating layer, and six phosphate groups in molecules of the sodium phytate layer and manganese ions dissolved out of lithium manganate particles can form a stable complex, so that the dissolved-out manganese ions are efficiently captured and prevented from being further migrated into an electrolyte to damage the performance of a battery; meanwhile, the sodium phytate layer forms a layer of compact physical barrier on the surfaces of the lithium manganate particles, so that direct contact between the lithium manganate particles and an electrolyte can be effectively blocked, and dissolution of manganese ions is inhibited from the source. Through a synergistic effect of a chelation effect and a physical barrier effect of the sodium phytate layer, the dissolution amount of manganese ions can be remarkably reduced, and the crystal structure of lithium manganate particles is prevented from being distorted, so that the structural stability of the positive electrode active material is improved.

The application provides a lithium manganate composite material, a preparation method thereof, a secondary battery and an electric device. The lithium manganate composite material comprises core particles and a coating layer; the molecular formula of the core particles is Li 1+x Mn 2‑y M y O 4‑Z A z , in the molecular formula, -0.2≤x≤0.2, 0≤y≤0.1, 0≤Z≤0.1, M comprises one or more of Mg, Al, Ge, Fe, Zn, Co, Ni, Cr, Mo, Nb and Sn, and A comprises one or more of F, Cl and S; the coating layer is coated on at least part of the outer surface of the core particles, and the coating layer comprises an organic phosphonic acid or a salt thereof. The application can ensure the structural stability of the core particles and the cycle stability of the negative electrode active material, thereby further improving the capacity performance, storage performance and cycle performance of the secondary battery.

The invention discloses a preparation method of hierarchical porous monocrystal lithium manganate, and belongs to the field of lithium ion battery materials. The method comprises the following steps: S1, dispersing an acidified cellulose template in a solvent, and adding a manganese source and a lithium source to form sol; filling gaps of the template with the sol, aging and drying to form a precursor; s2, calcining the precursor in an inert atmosphere in a segmented temperature control manner, and removing the template to obtain a calcined product; s3, the calcined product is subjected to pore channel structure strengthening treatment, single-crystal lithium manganate of a mesoporous-macroporous two-stage structure is obtained, and the problems that in existing template pore forming, the macropore shrinkage rate is uncontrollable, and shrinkage is caused after calcination are solved.

The application discloses a kind of Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material and its preparation method;The application uses organic-inorganic hybrid fluoride manganese salt material as Mn 4+ Source preparation Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material.The application uses organic-inorganic hybrid fluoride manganese salt material instead of all-inorganic fluoride manganese salt, manganese salt and permanganate as Mn 4+ Source, for preparing Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material, significantly improve the luminescent efficiency of Mn 4+ Activated fluorine (oxygen) oxide red fluorescent material.

The application belongs to the technical field of lithium batteries, and discloses a modified lithium manganate electrode material and a modification method thereof.The modification method comprises the following steps: mixing lithium manganate with a hydrogen peroxide solution to obtain the surface-modified lithium manganate electrode material.Through the surface modification method, the surface impurities of the spinel lithium manganate can be effectively removed without obvious influence on the crystal structure, the surface smoothness is improved, the diffusion rate of Li + is accelerated, the agglomeration of the spinel lithium manganate particles is effectively inhibited, and thus the phenomenon that the internal stress between the agglomerated particles causes micro-cracks on the surface of the material is effectively inhibited.The surface-modified lithium manganate electrode material has excellent electrochemical performance.The surface modification method is simple, low in cost, and suitable for industrial production.The application has low requirements on equipment, is simple to operate, has no special requirements on the production process, causes no pollution in the production process, and is friendly to the environment.

The invention provides a method for separating and repairing a heterogeneous positive electrode black powder material, which comprises the following steps of: performing carbonization heat treatment on the heterogeneous positive electrode black powder material to obtain a carbonized heterogeneous positive electrode black powder material; mixing the carbonized heterogeneous positive electrode black powder material with a density heavy liquid, and carrying out cyclone separation treatment to respectively obtain a heavy product and a light product; and mixing the heavy product with a lithium source, and carrying out lithiation calcination treatment to obtain the nickel cobalt lithium manganate positive electrode material. Carrying out oxidation sintering treatment on the light product to obtain a sintered material, mixing the sintered material with a carbon source and a lithium source, and carrying out thermal reduction treatment to obtain a lithium iron phosphate positive electrode material; the heterogeneous anode black powder material comprises a mixed material of ternary nickel cobalt lithium manganate anode material black powder and lithium iron phosphate anode material black powder. According to the separation and restoration method, no strong acid, strong base or waste liquid is generated, no heavy metal is lost, efficient recovery and utilization of key elements on the material level are achieved, and density heavy liquid and water for washing can be recycled.

The invention relates to the technical field of electrochemistry, in particular to an electrode, a preparation method thereof and a lithium extraction method. The preparation method of the electrode comprises the following steps that lithium manganate and terbium salt are calcined to obtain a first active substance, the first active substance is LiMn2-XTbXO4, and X is larger than or equal to 0.005 and smaller than or equal to 0.02; stirring the first active material, the conductive agent, the binder and the solvent to obtain electrode slurry; covering a graphite sheet with the electrode slurry, and drying to obtain a pre-electrode; in a lithium removal three-electrode system, the pre-electrode is used as a first working electrode, voltage is applied to the first working electrode, so that lithium ions in the first active substance are removed to form a second active substance with a lithium vacancy, and the electrode is obtained. The method provided by the embodiment of the invention is high in process controllability and simple, and the cycling stability of the second active substance in the obtained electrode and the selectivity to Li < + > are relatively excellent.