1494results about "Manganese compounds" patented technology

The invention provides a preferred orientation single crystal lithium-rich manganese-based positive electrode material, a preparation method thereof and a lithium ion battery, and relates to the technical field of battery positive electrode material preparation. The lithium-rich manganese-based positive electrode material is in a single crystal morphology, and in a diffraction pattern obtained by adopting an XRD (X-Ray Diffraction) instrument taking Cu K alpha as an incident light source, the peak intensity ratio I (003) / I (104) gt of a (003) peak of which 2 theta is positioned at 18.6 + / -0.1 degrees to a (104) peak of which 2 theta is positioned at 44 + / -0.5 degrees; 2. The single crystal lithium-rich manganese-based material with the specific crystal face preferentially growing is prepared, the material preferentially grows along the (003) crystal face by regulating and controlling the synthesis process of the material, the electrochemical performance of the material can be remarkably improved, and especially the stability under the high-rate charging and discharging condition can be remarkably improved.

The invention provides a positive electrode active material, positive electrode slurry, a positive plate, a battery and a vehicle, and belongs to the technical field of batteries, the positive electrode active material comprises lithium manganese iron phosphate and nickel cobalt lithium manganate; wherein the mass ratio of the lithium manganese iron phosphate to the nickel cobalt lithium manganate is (50-95): (5-50); the chemical general formula of the nickel cobalt lithium manganate is LiNiaCobMn (1-a-b) O2, a is more than or equal to 0.6 and less than 1, b is more than 0 and less than 0.5, and a + b is more than 0 and less than 1. According to the present invention, the lithium manganese iron phosphate and the nickel cobalt lithium manganate are compounded to serve as the positive electrode active material, and the mass ratio of the lithium manganese iron phosphate to the nickel cobalt lithium manganate is controlled within the range of (50-95): (5-50), such that when the positive electrode active material is applied to the battery, the high safety performance can be provided while the high energy density is provided so as to improve the comprehensive performance.

The invention provides a large-area coated lithium manganate positive electrode material and a preparation method thereof, and belongs to the technical field of energy materials, and the large-area coated lithium manganate positive electrode material comprises a lithium manganate positive electrode material body subjected to grain boundary pretreatment and a coating layer coating the surface of the lithium manganate positive electrode material body. The general molecular formula of the lithium manganate positive electrode material body subjected to grain boundary pretreatment is Li < 1 + a > Mn < 2-b > MbO4, M is a doping element, a is more than or equal to-0.1 and less than or equal to 0.3, and b is more than or equal to 0 and less than or equal to 0.3; the surface coating layer comprises an M'coating element. The lithium manganate positive electrode material body subjected to grain boundary pretreatment can realize large-area coating, and the lithium manganate positive electrode material subjected to special grain boundary pretreatment and large-area coating has excellent structural stability, so that corrosion of an electrolyte to lithium manganate is relieved, Mn dissolution at a high temperature is inhibited, and the lithium manganate positive electrode material has good electrochemical performance. Therefore, the lithium manganate positive electrode material has excellent high-temperature circulation and high-temperature storage performance, and the method is simple in process and can be implemented and popularized.

The invention relates to a secondary battery, a positive active material, a preparation method of the positive active material, a positive pole piece and an electric device. The secondary battery comprises a positive pole piece, the positive pole piece comprises a positive active layer, and the positive active layer comprises a positive active material; in a particle size distribution curve of primary particles in the positive electrode active material, the half-peak width is marked as WH, and WH is less than or equal to 2.5 microns; the average particle diameter D1 of the primary particles in the positive electrode active material satisfies 1.3 [mu] m < = D1 < = 3 [mu] m. The battery life of the secondary battery at a high voltage is significantly improved.

The invention relates to a surface-modified lithium-rich manganese oxide material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The material comprises a layered lithium-rich manganese oxide substrate and layered spinel heterostructures uniformly distributed on the surface of the lithium-rich manganese oxide substrate, the spinel heterojunction is one or two of LiMn2O4 and Li4Mn5O12, and the thickness of the spinel heterojunction is 5 nm to 10 nm; the surface of the modified lithium-rich manganese oxide material also contains an oxygen vacancy structure. Benefited from the existence of the heterostructure and the oxygen vacancy structure, the material disclosed by the invention has relatively high capacity and rate capability; in the electrochemical cycle process, release of oxygen, interface side reaction and irreversible phase change of a layered phase, a spinel phase and a rock salt phase are all inhibited. The lithium ion battery assembled by using the material as a positive electrode has high first-circle coulombic efficiency, and the problem of capacity fading in circulation is also relieved.

The present application provides a lithium iron phosphate composite material, a preparation method and use. The lithium iron phosphate composite material includes a core and a shell coated on the core, in particular, the core is Li6MnO4, and the shell is carbon-coated lithium iron phosphate. The lithium iron phosphate composite material provided by the present application adopts Li6MnO4 as the positive electrode lithium supplement material, and solves problems of active lithium loss and capacity depletion under high-rate charge and discharge of lithium iron phosphate positive electrode, thereby improving the rate performance of the lithium iron phosphate materials and the cycle life of batteries at high rates.

The invention belongs to a new energy material preparation technology, and particularly relates to a preparation method of high-tap-density chemical manganese dioxide and application of the high-tap-density chemical manganese dioxide in a lithium ion battery. The chemical manganese dioxide is obtained by carrying out one-step reaction on divalent manganese salt and an oxidizing agent at proper temperature and pH, the obtained chemical manganese dioxide is in a gamma crystal form, the tap density is greater than 2.38 g / cm < 3 >, the morphology is spheroidic, the purity is greater than 97%, and the impurity content reaches the industrial standard. Compared with a preparation method in the prior art, the preparation method is simple, low in cost and suitable for large-scale production, and the obtained manganese dioxide is high in tap density, good in crystallinity and excellent in electrochemical performance.

The invention relates to the technical field of new energy, in particular to a nickel-free lithium-rich manganese-based positive electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a precursor: mixing a lithium source, a sodium source and a manganese source according to a stoichiometric ratio of a chemical formula # imgabs0 #, grinding, and calcining in an oxidizing atmosphere to form a P3 type layered precursor; (2) ion exchange: mixing the P3 type layered precursor obtained in the step (1) with a lithium salt, and carrying out sodium-lithium ion exchange through a solid-phase reaction to form a sodium-deficient intermediate; and (3) annealing treatment: carrying out heat treatment on the material subjected to ion exchange to obtain the lithium-rich manganese-based positive electrode material with the O3 type layered structure. According to the invention, only substances composed of three elements of Li, Mn and O are used for synthesizing the positive electrode material, so that the use of materials containing cobalt and nickel is avoided.

The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium manganate positive electrode material, a preparation method thereof and a lithium battery, and the method comprises the following steps: adding a manganese sulfate solution, a precipitator and a complexing agent into a reaction kettle in a parallel flow manner, reacting under a first preset reaction condition, and introducing a first oxidant while reacting to obtain a mixed solution; concentrating the mixed solution to preset solid content, and adding a curing agent for curing reaction to obtain manganous-manganic oxide slurry; adding a manganese sulfate solution, a precipitant and a complexing agent into the reaction kettle in a parallel flow manner again, reacting with the manganous-manganic oxide slurry under a second preset reaction condition, introducing a second oxidizing agent while reacting to obtain a composite manganese oxide mixed solution, and filtering, washing and drying to obtain a composite manganese oxide; the composite manganese oxide and lithium carbonate are mixed, calcined, crushed and graded to obtain the lithium manganate positive electrode material, so that the electrochemical performance of the lithium manganate positive electrode material is improved.

The invention belongs to the technical field of battery materials, and particularly discloses preparation and application of a strontium lanthanum manganate-coated lithium ferric manganese phosphate composite material, and the method comprises the following steps: firstly, preparing strontium lanthanum manganate by adopting a lanthanum source, a strontium source and a manganese source as raw materials; respectively adding a lithium source, a phase transfer agent, a phosphorus source, L-ascorbic acid, an iron source and a manganese source into a solvent, and preparing a lithium ferric manganese phosphate precursor by using a solvothermal method; the lithium ferric manganese phosphate material is coated twice through strontium lanthanum manganate and carbon. According to the invention, strontium lanthanum manganate is used as a coating material, and the addition of lanthanide elements improves the crystal stability of lithium ferric manganese phosphate, keeps the integrity of an olivine-type structure, and avoids capacity fading caused by structure collapse, thereby improving the cycle stability of the lithium ion battery.

The invention provides a lithium manganate precursor with a crystal face induction effect, a preparation method of the lithium manganate precursor, a positive electrode material and a lithium battery, and belongs to the technical field of energy materials, the lithium manganate precursor can play a crystal face induction role in the subsequent lithium mixing sintering process, the lithium manganate precursor is spherical-particle manganous-manganic oxide, the particle size D50 is 3-15 microns, and the particle size D50 is 3-15 microns. The primary particles are uniform in size. The core advantage of the method is that synchronous and uniform doping of the element M and the element M'is realized at the precursor stage through a coprecipitation method. The co-precipitation doping technology not only ensures the atomic-scale uniform distribution of doping elements in manganous-manganic oxide, but also effectively stabilizes the crystal structure of the lithium manganate positive electrode material by utilizing the synergistic effect of the elements in the subsequent sintering process, and realizes the selective induced growth of the crystal face. The unique crystal face induction effect has significant contribution to improvement of the electrochemical performance, including cycling stability, rate capability and safety, of the positive electrode material.

The invention provides an in-situ synthesis method and application of aluminum-doped battery grade manganous-manganic oxide and lithium manganate. An aluminum-doped manganous-manganic oxide precursor is synthesized in one step through a direct homogeneous oxidation method, and then the lithium manganate positive electrode material is prepared through a high-temperature solid-phase reaction. The technological parameters such as the volume of a base solution, the concentration of a manganese-containing solution, the concentration of ammonia water, the flow of a salt solution, the stirring speed and the reaction temperature are regulated and controlled, and the synthesized manganous-manganic oxide precursor is uniform in particle size and has relatively high tap density and relatively low specific surface area. The capacity retention ratio of the obtained aluminum-doped lithium manganate reaches 85.16% after the aluminum-doped lithium manganate is circulated for 100 circles at the rate of 0.2 C, and the discharge specific capacity of the aluminum-doped lithium manganate is 105.8 mAh / g at the high rate of 5C. According to the method, the efficient recycling of waste battery resources is realized, the production cost is reduced, and meanwhile, the problem of non-uniformity of a conventional doping process is solved.

The invention relates to the technical field of gas sensors, and particularly discloses an electrochemical formaldehyde sensor electrode, a preparation method thereof and an electrochemical formaldehyde sensor. The electrochemical formaldehyde sensor comprises an electrochemical formaldehyde sensor electrode and a binary electrolyte, the electrochemical formaldehyde sensor electrode comprises a polytetrafluoroethylene film, the polytetrafluoroethylene film is coated with slurry for an electrochemical formaldehyde sensor electrode; and the slurry is formed by mixing nano manganese dioxide, platinum carbon and a Nafion solution. According to the electrochemical formaldehyde sensor, the electrode prepared from the slurry formed by mixing the nano manganese dioxide, the platinum carbon and the Nafion solution has relatively high catalytic activity, so that the sensor shows extremely high sensitivity and extremely good linearity on formaldehyde, and the electrochemical formaldehyde sensor has relatively high catalytic activity by regulating and controlling the proportion of the binary electrolyte. The electrochemical formaldehyde sensor has the advantages of high sensitivity, low cost, fast response, high detection precision and the like.

The present invention relates to the field of battery materials, and provides a lithium manganate cathode material coated with lithium triborate and a preparation method thereof. The cathode material is a porous lithium manganate / lithium triborate composite electrode material, which includes porous lithium manganate with a highly connected directional columnar pore structure and a lithium triborate coating covering the pore surface, with a mass ratio of (86.0~92.0):(8.0~14.0), a coating thickness of 600~800 nm, a pore diameter of 45~95 μm, and a porosity of 65~78%. The preparation method includes: preparing a precursor colloidal solution by the sol-gel method, obtaining porous lithium manganate through low-temperature freezing molding and freeze-drying, and forming a cathode substrate through pre-oxidation and high-temperature sintering; subsequently, using vacuum-assisted impregnation, ultrasound, and nitrogen pressure to promote the penetration of the lithium triborate precursor solution, and forming a uniform coating layer through gradient drying and annealing treatment. The present invention significantly improves the crystal structure stability of the cathode material, inhibits manganese dissolution, improves the cycle life and rate performance, and has wide application value.

The invention provides a control system for preparing manganous-manganic oxide from impurity-containing manganese liquid. Comprising a synthesis kettle; the feeding metering pump set comprises a liquid caustic soda metering pump and a pre-synthesis liquid metering pump; the valve group comprises a discharge valve, a steam valve and a pure water valve; the pH meter is arranged on the synthesis kettle; a first flow meter; a second flow meter; the M01 stirring motor is arranged on the synthesis kettle and is used for mixing solutions in the kettle; the M02 stirring motor is arranged on the overflow liquid receiving tank; the air blower is arranged on a pipeline connected with the synthesis kettle; the first liquid level meter is arranged on the synthesis kettle; the second liquid level meter is arranged on the overflow liquid receiving tank; and the thermometer is arranged on the synthesis kettle and is used for monitoring the temperature of the solution in the synthesis kettle. The system further comprises a central controller. By means of the system, the feeding state of the synthesis kettle can be automatically regulated and controlled, monitoring, debugging and alarming of the preparation process are facilitated, meanwhile, feeding of feeding liquid is stable, the temperature of the synthesis kettle is accurately controlled, and the fluctuation range of the pH value is small.

The invention discloses a surface site and interlayer structure coupled pinning layered manganese oxide electrode material as well as a preparation method and application thereof, and belongs to the technical field of energy storage materials. The preparation method comprises the following steps: firstly, preparing a metal ion Mo pinning layered manganese oxide precursor by utilizing a hydrothermal method, and then treating the precursor by utilizing a plasmon effect of laser to obtain the metal ion Mo pinning layered manganese oxide rich in oxygen defects. And finally, processing the metal ion Mo pinning layered manganese oxide rich in oxygen defects by using the plasmon effect of the laser again in an anion environment to obtain the surface site and interlayer structure coupled pinning layered manganese oxide electrode material. According to the preparation method disclosed by the invention, the distribution environment of charges around atoms in a MnO2 bulk phase is changed, and the Haendean band gap width of the MnO2 bulk phase is regulated and controlled, so that the MnO2 bulk phase has a proper work function. When the MnO2 is used as a water-based zinc ion battery positive electrode material, the reaction activity of MnO2 and the stability of a circulating structure can be remarkably improved.

The invention relates to the technical field of preparation of manganous-manganic oxide, in particular to a production and preparation process of a manganous-manganic oxide material for batteries, which comprises the following steps: dissolving high-purity manganese sulfate to prepare a manganese sulfate solution, and adding a dispersing agent and a surfactant to obtain a manganese salt solution; the method comprises the following steps: adding a base solution into a reaction kettle, stirring and heating, conveying a manganese salt solution and ammonia water, synchronously introducing oxygen, dividing the whole oxidation reaction process into two stages, controlling the flow velocity of the ammonia water in different stages, and dynamically adjusting the temperature; and carrying out suspension precipitation on manganous-manganic oxide obtained by the oxidation reaction, aging, and carrying out dehydration suction filtration, washing and drying to obtain the manganous-manganic oxide material for the battery. The invention aims to adjust the morphology of the manganous-manganic oxide finished product by controlling reaction conditions, effectively reduce the granularity of the product and enhance the uniformity of particle size distribution.

The invention provides a lithium-rich manganese-based positive electrode material, a preparation method thereof and a lithium ion battery, and relates to the field of lithium ion batteries. Comprising a base body, a first coating layer and a second coating layer, the chemical general formula of the matrix is LiaNixCoyMnzMwO (1 + a-b) Rb, M comprises one or more of Al, Mg, Mn, Zr, Ti, W, Nb, Ta, Te, Na, La and Sr, R comprises one or more of Cl, N and S, 1.2 < = a < = 1.4, 0 < = b < = 0.1, 0.25 < = x < = 0.4, 0 < = y < = 0.1, 0.6 < = z < = 0.75, 01t, and 0 < = y < = 0.1. W < = 0.02, and x + y + z + w = 1; the first coating layer comprises spinel phase and / or spinel-like phase lithium manganese oxide; the second coating layer includes a Y-containing compound. And the cycling stability and the ionic conductivity of the lithium-rich manganese-based positive electrode material can be effectively improved.

The present invention provides a cathode material, a preparation method thereof and an application. The chemical formula of the cathode material is xLi2MnO3·(1−x−y)LiNi a T M(1‑a) O2·yLiMn b A (1‑b) PO4, wherein 0 < x < 1, 0 < y < 1, 0 ≤ a ≤ 1, 0.5 ≤ b ≤ 1, T M and A each independently include a metal element; the cathode material can form a continuous phase transition, has a supercrystalline domain structure and a stable layered structure, can stabilize lattice oxygen, reduce voltage drop, and thus can significantly improve the cycling performance of the battery at high voltages.

The invention discloses a nitrogen-doped zinc ion battery manganese-based positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing a strong oxidant and a manganese salt, putting the mixture into a beaker, adding deionized water, and uniformly stirring to form a mixed solution; transferring the mixed solution into a high-pressure reaction kettle with a polytetrafluoroethylene lining, and heating the high-pressure reaction kettle in a drying oven; cooling, precipitating, filtering and washing for multiple times, and then putting into a drying oven for vacuum drying to obtain an original manganese-based positive electrode material; the preparation method comprises the following steps: respectively weighing an original manganese-based positive electrode material and hexamethylenetetramine, flatly laying the original manganese-based positive electrode material at the bottom of a lining of a reaction kettle, and putting the hexamethylenetetramine into a beaker; and putting the beaker into a reaction kettle, moving the beaker and the reaction kettle into a drying oven, and heating to obtain the surface nitrogen-doped manganese-based positive electrode material.

The invention provides a high-performance all-solid-state electrolytic tank for producing hydrogen by electrolyzing water and a preparation method of the high-performance all-solid-state electrolytic tank. The preparation method mainly comprises the following steps: preparation of electrode powder: preparing (La0. 6Sr0. 4) 0.95 Co0. 2Fe0. 8O3-delta (LSCF) powder by adopting a liquid-phase synthesis method, and preparing MxCe1-xNyO2 powder by adopting a coprecipitation method for an electrode and an isolating layer; preparing a half cell by adopting a co-casting process; an isolating layer and an oxygen electrode are prepared by adopting a silk-screen printing technology, and high-content water vapor is introduced to realize hydrogen production by electrolyzing water. The prepared high-performance all-solid-state electrolytic tank has efficient water electrolysis hydrogen production catalytic activity and Faraday efficiency, can operate at the medium-high temperature of 650-850 DEG C, and can effectively reduce electric energy consumption and improve energy conversion efficiency.

The present invention relates to the field of lithium-ion batteries, and more specifically, to a positive electrode material, a preparation method thereof, a positive electrode, and a battery. The present invention provides a positive electrode material comprising a lithium-rich core and a conductive layer coated on the surface of the lithium-rich core; at least one of the core and the conductive layer is doped with at least one of the elements P and B. The positive electrode material provided by the present invention, having a conductive layer doped with at least one of the elements P and B, can stabilize the material structure and improve the material's rate capability and cycling stability.

The invention provides a positive active material, a positive pole piece, a secondary battery, a battery module, a battery pack and a power utilization device, the positive active material comprises a compound LiaAxMn (1-y) ByP (1-z) CzO (4-n) Dn, A comprises one or more elements selected from IA group, IIA group, IIIA group, IIB group, VB group and VIB group; b comprises one or more elements selected from a group IA, a group IIA, a group IIIA, a group IVA, a group VA, a group IIB, a group IVB, a group VB, a group VIB and a group VIII; c comprises one or more elements selected from the group consisting of Group IIIA, Group IVA, Group VA and Group VIA; d comprises one or more elements selected from the group consisting of Group VIA and Group VIIA. The material can improve the rate capability, reduce the dissolution of Mn and Mn-site doped elements, and significantly improve the cycle performance and high-temperature stability of the secondary battery.

The invention belongs to the technical field of nuclear magnetic resonance spectrums, and particularly relates to a preparation method of a responsive multi-component material and application of the responsive multi-component material in 129Xe / 1H dual-mode signal change. According to the method, the Fe3O4 (at) SiO2 nanoparticles are used as a precursor, KMnO4 is used as a raw material, the Fe3O4 (at) SiO2 (at) MnO2 nanoparticles are synthesized, and the synthesized nanoparticles are complete in morphology and uniform in size. A transverse relaxation rate 1 / T2 signal of protons of the multi-component material obtained by the strategy is quenched, a dissolved state signal of 129Xe is basically unchanged, but after the reaction with 10mM glutathione, the 1 / T2 signal is recovered, the dissolved state signal of 129Xe is obviously reduced, the change of a 129Xe / 1H double nuclear magnetic resonance signal is realized, and the change of the 129Xe / 1H double nuclear magnetic resonance signal is realized. And the method has certain significance for enriching the application of the hyperpolarized 129Xe magnetic resonance probe and the development of a multi-mode magnetic resonance imaging nano platform.

The invention provides a preparation method and application of modified'sea urchin type 'manganous-manganic oxide, ammonia water is used as a main precipitator, manganese sulfate, the precipitator and a complexing agent are added into an alkaline base solution, filtering, washing and drying are performed after reaction to obtain'sea urchin type' manganous-manganic oxide, and the modified'sea urchin type 'manganous-manganic oxide is obtained by modifying the surfaces of particles on the basis. Al, Mg, Ti, Zn and other elements are introduced through liquid phase doping, a wrapping layer is formed on the surface of the sea urchin type manganous-manganic oxide, and the electrochemical performance and stability of the lithium manganate material can be further improved. The invention provides modified sea urchin-type manganous-manganic oxide with primary crystal grains larger than 300 nm, and the manganous-manganic oxide can effectively reduce the erosion effect of electrolyte by means of high-crystallinity and large-size conical crystal grains.

An aluminum-manganese composite nanocrystal, and a preparation method therefor and the use thereof. The method for preparing the aluminum-manganese composite nanocrystal comprises: step 1, mixing an aluminum salt solution, a manganese salt solution and an anionic adjuvant solution to obtain a mixture, and adjusting the pH value of the mixture to 5.5-8.5; and step 2, heating the mixture for a reaction, and washing the obtained solid reactant to obtain the aluminum-manganese composite nanocrystal. According to the aluminum-manganese composite nanocrystal prepared using the preparation method and the use thereof in the preparation of a vaccine adjuvant, a pharmaceutical composition, a drug delivery carrier or an immunogenic composition, the technical problem that an existing aluminum adjuvant cannot activate humoral immunity and cell immunity at the same time can be effectively solved.

A positive electrode active material for nonaqueous electrolyte secondary batteries according to the present invention is a composite oxide which is represented by general formula LixTMtmMyO2-fFf and has a crystal structure that belongs to the space group Fm-3m; and in the general formula, TM represents a transition metal, M represents a non-transition metal, and if Q=2×tm×(1−(1−f / 2)5), Q<1 is satisfied. With respect to a dV / dq-SOC curve showing the relationship between the state of charge SOC and dV / dq of a half cell that contains this composite oxide, the dV / dq-SOC curve being obtained by charging the half cell with a charging current of 0.1 C at 25° C. to an end voltage within the range of 4.7 V to 4.95 V, there is one or more peaks within the SOC range from 10% to 40%.

A composite cathode active material and a cathode and a lithium battery including the composite cathode active material. The composite cathode active material has a core including a plurality of primary particles including a nickel-containing first lithium transition metal oxide having a layered crystal structure; a grain boundary disposed between adjacent primary particles of the plurality of primary particles; and a shell on the core, the shell including a second lithium transition metal oxide having a spinel crystal structure, wherein the grain boundary includes a first composition having a spinel crystal structure.

The invention relates to a positive electrode active material, a positive electrode, and a rechargeable lithium battery. The positive electrode active material comprises a first positive electrode active material, a second positive electrode active material and a third positive electrode active material; the first positive electrode active material includes a lithium nickel manganese-based composite oxide in which a nickel content is greater than or equal to about 60 mol% based on 100 mol% of a total metal other than lithium in the first positive electrode active material, and is in the form of a plurality of secondary particles each including a plurality of aggregated primary particles, the second positive electrode active material is in the form of a plurality of individual particles including a lithium nickel manganese-based composite oxide having a nickel content of greater than or equal to about 60 mol% based on 100 mol% of a total metal other than lithium in the second positive electrode active material, and the third positive electrode active material is in the form of a plurality of particles including a lithium manganese-based oxide.

The invention discloses a positive electrode material as well as a preparation method and application thereof. The chemical formula of the positive electrode material is Li < 1 + n > Mn < x > AM < y > TM < z > O < 2-m > Q < m >, n is 0 to 0.4, and x is 0.5 to 0.7; aM is Na and / or K, each y independently ranges from 0.1 to 0.25, and the sum of all y is smaller than or equal to 0.4; tM is Zr, Cu, Mg, Ti, Fe, Al or the like, each z is independently 0.01-0.1, and the sum of n, x, all y and all z is 1; q is F, Cl, Br, I and the like, each m independently ranges from 0.1 to 0.35, and the sum of all m is smaller than or equal to 0.4; during preparation, all the raw materials are mixed, ground and sintered in one step, the preparation method is simple and easy to operate, and the prepared positive electrode material also has excellent electrochemical performance, so that doping of metals such as Ni and Co which are relatively high in price can be avoided, and the cost is reduced.