174results about "Cobalt oxides/hydroxides" patented technology

The application discloses a method for selectively extracting metals from waste ternary lithium batteries by using a eutectic solvent. The method uses a eutectic solvent DES synthesized by choline chloride and oxalic acid as an extraction agent, quotes dimethyl sulfoxide DMSO and water as diluents, introduces a circulation and extraction step on the basis of metal element series immersion, i.e. extracts lithium oxalate from the leaching solution with ethanol and recycles the DES by fractional distillation, and makes innovations in recycling of metal lithium and recycling of the DES. The application has the advantages of high efficiency extraction, high precision purification, innovative extraction of lithium element and innovative recovery of the reagent DES.

The invention discloses a modified cobaltosic oxide catalyst and a preparation method and application thereof.The catalyst comprises a carrier foamed nickel, tungsten and chlorine co-doped cobaltosic oxide nanosheets W and Cl-Co3O4, the tungsten and chlorine co-doped cobaltosic oxide nanosheets W and the Cl-Co3O4 are loaded on the carrier, cobalt chloride and tungsten salt serve as precursors of the catalyst, and the tungsten and chlorine co-doped cobaltosic oxide nanosheets W and the Cl-Co3O4 are loaded on the carrier. The preparation method comprises the following steps: firstly, carrying out a hydrothermal reaction to obtain a nickel foam loaded tungsten-doped basic cobalt chloride nanosheet W-Co2 (OH) 3Cl2, and then carrying out in-situ conversion on the Co2 (OH) 3Cl2 into a nickel foam loaded tungsten and chlorine co-doped cobaltosic oxide nanosheet W, Cl-Co3O4 through calcination. According to the invention, chlorine and tungsten are introduced into cobaltosic oxide, so that the activity and stability of electrocatalytic oxygen evolution are improved, and the cobaltosic oxide is used as an anode catalyst for electrocatalytic seawater decomposition and has excellent activity and stability of electrocatalytic oxygen evolution.

The invention relates to the field of nano materials and photonic crystal materials, in particular to nano particles, preparation of the nano particles and application of the nano particles in self-assembly of three-dimensional non-close-packed photonic crystals. The nanoparticles can be self-assembled into a three-dimensional non-close-packed photonic crystal in a concentration range of 1 wt%-60 wt%. According to the invention, the problem that the self-assembly of the three-dimensional non-close-packed colloid photonic crystal is difficult to realize at low concentration at present is solved. By adjusting the mass fraction of the particles in a solution, the three-dimensional non-close-packed colloidal photonic crystal with rich colors can be formed through self-assembly, and the three-dimensional non-close-packed colloidal photonic crystal has wide application prospects in the fields of sensing, display and the like.

This invention belongs to the field of lithium-ion battery technology, specifically relating to a composite cathode material for lithium-ion batteries and its preparation method. The composite cathode material consists of three parts: a cathode matrix material, a lithium replenishment material, and a catalyst material. The preparation method is as follows: (1) preparing a composite material of the cathode matrix material and the lithium replenishment material in situ; (2) dispersing the catalyst material on the surface of the composite material and forming a stable interface layer between the catalyst material and the lithium replenishment material. Through the method of this invention: the lithium replenishment material has both surface modification of the cathode matrix material and lithium replenishment of the negative electrode, simultaneously improving the battery's initial efficiency and cycle stability; introducing the catalyst material onto the surface of the lithium replenishment material in situ fixes the free O generated by the Li release from the lithium replenishment material, alleviating the battery swelling phenomenon and further improving the battery's cycle stability and safety; moreover, the preparation process is simple, the raw materials are cheap and readily available, the production cost is low, and it is easy to promote industrial production.

Provided is a method for separating impurities and cobalt without using an electrolysis process from a cobalt chloride solution containing impurities and producing a high purity cobalt sulfate. The production method for cobalt sulfate includes: a copper removal step (S1) of adding a sulfurizing agent to a cobalt chloride solution containing one or more impurities of copper, zinc, manganese, calcium, and magnesium and generating a precipitate of sulfide of copper to separate to remove copper; a neutralization step (S2) of adding a neutralizer or a carbonation agent to a cobalt chloride solution having undergone through the copper removal step (S1) and generating cobalt hydroxide or basic cobalt carbonate to separate magnesium; a leaching step (S3) of adding sulfuric acid to the cobalt hydroxide or the basic cobalt carbonate to obtain cobalt sulfate solution; and a solvent extraction step (S4) of bringing an organic solvent containing an alkyl phosphoric acid-based extractant to the cobalt sulfate solution and extracting zinc, manganese, and calcium into the organic solvent to separate to remove zinc, manganese, and calcium. These steps are sequentially executed.

A method for preparing a two-dimensional porous oxide belongs to the technical field of porous oxide preparation. The method includes the following steps: (1) using a metal salt as a precursor, an ion-intercalated two-dimensional oxide is prepared by a molten salt method; (2) the ion-intercalated two-dimensional oxide is mixed with a lithium initiator, reacted for a predetermined time, and then the unreacted lithium initiator is removed, filtered, and washed to obtain the two-dimensional porous oxide. The two-dimensional porous oxide prepared by this method forms uniform pores with a pore size range of 2-10 nm and a specific surface area of ​​200-300 m². 2 / g.

The application discloses a kind of foam nickel supported copper-cobalt bimetallic composite catalyst and preparation method and application, belong to electrocatalytic material technical field.CuSO4·5H2O, CoSO4·7H2O and C6H5Na3O7 are mixed and using constant voltage deposition method is loaded on foam nickel substrate, and CuCo / NF precursor is obtained, and copper-cobalt bimetallic composite catalyst Cu x O-Co3O4 / NF with excellent catalytic activity and stability is successfully prepared by temperature programmed calcination.The application significantly enhances the adsorption capacity of nitrate molecules on the catalyst surface by utilizing the synergistic effect of Cu and Co, reducing the incidence of side reactions, thereby improving the catalytic efficiency of nitrate reduction reaction.Compared with traditional single catalyst, it shows higher ammonia yield, Faraday efficiency (FE) and better stability, and has broad application prospect.

The invention discloses a material reactor, a material reaction system, a method for decomposing a self-oxidation reduction precursor and application. The material reactor comprises a dividing piece and a reaction cylinder, adjusting the rotation of the reaction cylinder; the reaction cylinder is provided with a reaction cavity along the length direction; the dividing piece is placed in the reaction cavity; the dividing piece is provided with at least three dividing plates; one ends of the plurality of sub-plates are connected and are distributed in a surrounding manner by taking the connected position as the center; the other ends of the partial split plates are in contact with the inner wall of the reaction cavity; the material reaction system comprises a rack, a heating device, a feeding device, a discharging device and a material reaction system, according to the scheme, multiple synergistic effects of preventing adhesion, improving heat transfer and accelerating gas-solid reaction can be realized, and the problem of waste caused by the fact that gas decomposed by raw materials does not participate in synthesis and is directly discharged in a production process is solved.

The invention belongs to the technical field of food safety detection, and particularly relates to a histamine molecular imprinting electrochemical sensor based on a carbon-based nano composite material and a preparation method and application of the histamine molecular imprinting electrochemical sensor. Aiming at the problems of poor selectivity, high detection limit or complicated operation and the like of the existing histamine detection technology, a Co3O4 / N-HCS (cobaltosic oxide / nitrogen-doped hollow carbon sphere) composite material is prepared by adopting a solvothermal method, o-phenylenediamine (o-PD) is taken as a functional monomer, a molecularly imprinted polymer membrane (MIP) is constructed on the surface of a glassy carbon electrode (GCE) by adopting an electropolymerization method, and the histamine detection electrode is prepared. The MIP / Co3O4 / N-HCS / GCE sensor with specific recognition sites on histamine is formed. The sensor has high selectivity, high sensitivity and good stability, is simple and convenient to operate and rapid in detection, can efficiently realize accurate detection of histamine in food, and is suitable for safety monitoring scenes of various foods such as fermented food, aquatic products and dairy products.

The invention discloses a method for preparing vinyl chloride by electrocatalytic dechlorination of 1, 2-dichloroethane, a working electrode of the method takes a metal oxide as a catalyst, and the metal oxide is selected from at least one of the following metal oxides: Pd, Mn, Fe, Co, Ni, Cu, Ru and Mo. According to the invention, the metal oxide powder is used as the electrocatalyst, the catalyst is coated on the electrode material to prepare the working electrode, the working electrode is applied to electrocatalytic dechlorination reaction of 1, 2-dichloroethane, vinyl chloride can be generated at high selectivity at room temperature, a new way is opened up for production of vinyl chloride by electrocatalytic dechlorination, and the method has wide application prospect. And a green and low-cost solution is provided for efficient synthesis of vinyl chloride.

The present application mainly relates to the technical field of pollution gas prevention and treatment, and particularly relates to a preparation method and application of a transition metal oxide catalyst for high-efficiency catalytic decomposition of N2O pollution. The preparation method is as follows: a specific surfactant is dissolved in deionized water, inorganic acid is added, stirring is performed until the mixture is miscible, transition metal nitrate is added, reaction is performed until a gel is formed, drying is performed to obtain a dry gel, calcination is performed, and the target catalyst is obtained. The prepared catalyst 10TX-Co3O4 has extremely high low-temperature catalytic activity, and the catalytic conversion rate of N2O reaches 90% at 300 DEG C; and under the condition of coexistence of O2, NO x , H2O impurity gas and N2O (simulated tail gas of a nitric acid plant), the catalyst still has high catalytic activity and stability (81% conversion rate at 400 DEG C). The present application provides a plurality of high-activity low-temperature catalysts for catalytic decomposition of N2O, and provides a wider train of thought for subsequent design of the catalyst and effective development and utilization of the additives.

The application relates to the technical field of lithium ion batteries, in particular to a coated ternary positive electrode material and a preparation method and application thereof. The coated ternary positive electrode material comprises a ternary positive electrode material and a coating layer on the surface of the ternary positive electrode material, and the coating layer comprises an aluminum oxide chemically modified cobalt compound layer; in the coating layer, the molar ratio of aluminum oxide and the cobalt compound is (0.001-2):100. The provided coated ternary positive electrode material can improve the specific capacity and cycle performance of a battery.

The application discloses a kind of cubic system tricobalt tetroxide quantum dots solvent hot preparation method, comprising the following steps: the mixture is obtained by mixing with set proportion with the source of cobalt, alcohol, polyvinylpyrrolidone, deionized water and hydrogen peroxide;The mixture is heated to a preset temperature in a sealed container with a predetermined volume ratio and isothermal reaction for a set time;When the reaction is finished, the reaction product is cooled to room temperature and washed, and the cubic system tricobalt tetroxide quantum dots are obtained after drying.The cubic system tricobalt tetroxide quantum dots with specific crystal structure can be obtained under the optimal preparation conditions, and the tricobalt tetroxide quantum dots with high uniformity of particle size and particle dispersion can be obtained;It can be applied in catalysis, energy storage and sensing fields, and the preparation process is simple and easy to operate, with good repeatability, low energy consumption and low cost, and the process parameters can be scaled up or down, suitable for industrial mass production.

The invention provides a preparation method of a CoO / CoP-LIG heterojunction electrolyzed water catalyst, and belongs to the technical field of preparation methods of electrocatalytic materials. CoO and CoP in the obtained electro-catalysis material are of a heterostructure, a large number of active interfaces and defect sites are exposed between the two components, and the electro-catalysis reaction is facilitated. The laser induced graphene (LIG) has excellent conductivity and huge specific surface area, and an ideal platform is provided for loading of CoO / CoP heterojunction nanosheets and construction of electron / mass transfer channels. The water electrolysis catalyst is simple in preparation process, high in stability, low in raw material price, easy to realize industrial mass production, and beneficial to realizing industrial development of hydrogen production by water electrolysis. The electrolyzed water catalyst can also be applied to degradation of urea in industrial and agricultural pollutants, and is an environment-friendly electrolyzed water catalyst.

The invention relates to a preparation method of ultrathin two-dimensional cobalt oxide rich in oxygen vacancies and an application of the ultrathin two-dimensional cobalt oxide rich in oxygen vacancies in food total antioxidant capacity detection, and belongs to the fields of low-dimensional nano materials, biological mimic enzyme catalysis and analytical chemistry. According to the preparation method, cobalt acetylacetonate and hexadecyl trimethyl ammonium bromide are adopted as raw materials, and the ultrathin two-dimensional cobalt oxide nano-enzyme rich in oxygen vacancies is prepared through a hydrothermal reaction and high-temperature pyrolysis. The obtained ultrathin two-dimensional cobalt oxide nano-enzyme rich in oxygen vacancies has excellent peroxidase-like catalytic activity and selectivity. The oxygen-vacancy-rich metal oxide has the advantages of high stability, easy mass production and low preparation cost, and is expected to be widely used in the fields of biosensing, agriculture, food engineering, catalysis and the like.

The application provides an aluminum-manganese-nickel co-doped cobalt carbonate precursor and a preparation method and use thereof. The preparation method comprises the following steps: mixing a cobalt-aluminum mixed salt solution, a manganese salt solution, a nickel salt solution and a precipitant solution, and performing a co-precipitation reaction to obtain the aluminum-manganese-nickel co-doped cobalt carbonate precursor; wherein the cobalt-aluminum mixed salt solution comprises a complexing agent; the manganese salt solution comprises a first surfactant and a second surfactant, the first surfactant comprises a crown ether surfactant, and the second surfactant comprises a non-ionic surfactant. The preparation method provided by the application realizes uniform doping of aluminum, manganese and nickel in the cobalt carbonate precursor material, not only reduces the risk of low capacity caused by only increasing the aluminum content, but also reduces the risk of small particle explosion in the reaction process, so that the obtained tricobalt tetraoxide precursor material has uniform particle size and uniform distribution of doped elements.

The invention relates to the technical field of transformer fault detection, in particular to a low-temperature high-sensitivity detection method applied to transformer fault characteristic gas CO. The preparation method comprises the following steps: S1, preparing Y2O3 nano powder by adopting a chemical precipitation method; and S2, preparing the CO3O4 (at) Y2O3 composite material from the CO3O4 powder and the Y2O3 powder, and applying the CO3O4 (at) Y2O3 composite material to the low-temperature high-sensitivity detection of the fault characteristic gas CO of the transformer. According to the low-temperature high-sensitivity detection method applied to the transformer fault characteristic gas CO, through preparation and application of the composite material, the CO3O4-Y2O3 composite material can have high sensitivity, good stability and selectivity on the transformer fault characteristic gas CO at low temperature, meanwhile, the response of the CO3O4-Y2O3 composite material is remarkably superior to that of CO2, and the detection method has the advantages of high sensitivity, good stability and good selectivity on the transformer fault characteristic gas CO at low temperature. Therefore, the application requirement of on-line state monitoring of the transformer is met.

A process for preparing metal oxide comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum. The process comprising:reacting a metal sulfate comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum with lithium hydroxide and optionally a chelating agent to obtain a solid comprising a metal hydroxide comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum, and a liquid comprising lithium sulfate, the metal sulfate comprising (i) at least one metal chosen from nickel and cobalt and optionally (ii) at least one metal chosen from manganese, lithium and aluminum;separating the liquid and the solid from one another to obtain the metal hydroxide;submitting the liquid comprising lithium sulfate to an electromembrane process for converting the lithium sulfate into lithium hydroxide; andreusing at least a first portion of said lithium hydroxide obtained by the electromembrane process for reacting with the metal sulfate;reacting at least a second portion of said lithium hydroxide obtained by the electromembrane process with the obtained metal hydroxide to obtain a mixture of metal hydroxides; androasting said mixture of metal hydroxides to obtain the metal oxide.

The invention discloses cobalt carbonate, a preparation method and application, the cobalt carbonate comprises a cobalt carbonate inner core and an aluminum-doped cobalt carbonate coating layer coating the cobalt carbonate inner core, and the pore volume of the cobalt carbonate inner core is smaller than that of the cobalt carbonate. The cobalt carbonate in the application has a synergistic effect between a gradient pore structure and gradient aluminum doping distribution, so that the problem that cobalt carbonate particles are easy to crack and remove powder during sintering is solved, the sintered cobaltosic oxide can be kept to have relatively excellent tap density and mechanical strength, and the electrochemical performance of lithium cobalt oxide is further improved.

The invention belongs to the technical field of secondary battery processing, and particularly relates to a preparation method of a positive electrode catalyst of a metal-air secondary battery, and the preparation method comprises the following steps: heating a metal salt solution to 80-100 DEG C at a constant temperature, and dropwise adding ammonia water to adjust the pH value to be greater than 8.5; adding an amine compound into the mixed solution, stirring for 1 hour, and adding acetic acid to adjust the pH value to 7.5-8.0; evaporating the solvent at constant temperature to obtain a precursor, crushing and grinding for later use; and sintering the precursor in argon or hydrogen-argon mixed gas at a high temperature of 700-900 DEG C for 6-12 hours to obtain the carbon nanotube coated metal oxide catalyst. The positive electrode catalyst of the metal-air battery with the carbon nano tube coated with the metal oxide is obtained through a pyrolysis method, and the catalyst can fully expose active sites, promote adsorption and desorption of intermediates, accelerate electron transport and reduce reaction energy barriers, so that the charge-discharge overpotential is greatly reduced, and the service life of the battery is prolonged. And the metal-air secondary battery with more excellent cycling stability can be realized.

The invention relates to a preparation method of a Co3O4 nanowire spherical array coupled bimetallic hydroxide electrode material, and belongs to the technical field of electrocatalyst preparation. The preparation method comprises the following steps: pre-treating carbon cloth with a piranha solution, preparing a precursor solution from Co (NO3) 2.6 H2O, NH4F and Co (NH2) 2, preparing a Co3O4 nanowire by using a hydrothermal method in combination with an annealing process, preparing a bimetallic solution, and carrying out electro-deposition to obtain the Co3O4 nanowire coupled bimetallic hydroxide electrode material. A high-binding-force and high-crystallinity Co3O4 nanowire structure is constructed by pretreating carbon cloth, accurately controlling the molar ratio of Co < 2 + > to F <-> to urea in a precursor solution and combining a hydrothermal method with an annealing process, meanwhile, step-by-step electro-deposition is carried out in the range of-1.2 V to 0.2 V by adopting a chronoamperometry, each step stays for 5 seconds, and codeposition kinetics of Ni < 2 + > and Fe < 3 + >, Co < 2 + >, Zn < 2 + > or Cu < 2 + > is accurately controlled; through collaborative optimization of the means, the catalytic activity, the structural stability and the charge transfer efficiency of the composite electrode material are remarkably improved.

This invention discloses a continuous and efficient method for preparing nano-sized cobalt hydroxyl oxide and cobalt tetroxide, and their applications. The method includes the following steps: (1) adding a cobalt salt solution, an oxidant, and a precipitant to a complexing agent and a solvent, and stirring to obtain a reactant; (2) drying the reactant at 150-160°C to obtain the cobalt hydroxyl oxide; and drying the reactant at 220-230°C to obtain the cobalt tetroxide. Compared with batch production methods, the continuous method of this invention has higher production efficiency, and the prepared cobalt hydroxyl oxide has advantages such as large specific surface area, easy crushing, and small particle size.

The application provides a single-core double-module graphene-based gas sensor and a preparation method thereof, and relates to the technical field of gas sensors.The preparation method comprises the following steps: dividing the main surface of a wooden substrate into a first surface and a second surface which are arranged adjacently; coating a first metal salt solution on the first surface and a second metal salt solution on the second surface; irradiating the first surface and the second surface by using a laser beam, so that lignin and cellulose in the wooden substrate are cracked and restructured to form graphene, the first metal salt immersed in the first surface is decomposed to form first metal oxide nanoparticles, and the second metal salt immersed in the second surface is decomposed to form second metal oxide nanoparticles, so that a first sensitive layer and a second sensitive layer are obtained; and coating a conductive material on the wooden substrate and on the two sides of the first sensitive layer and the second sensitive layer respectively, so that a connecting electrode which is in contact with the first sensitive layer and the second sensitive layer respectively is formed, and a single-core double-module graphene-based gas sensor is obtained.

This invention discloses a method for preparing and applying an aqueous zinc-ion battery cathode material, comprising the following steps: mixing a cobalt source and organic raw materials for a hydrothermal reaction, obtaining a precursor, and then treating it at high temperature to obtain the cathode material. This invention enables the synthesis of straw bundle-like Co3O4 cathode materials with micro / nano scales via a simple hydrothermal method. On the one hand, nanoparticles help increase additional active sites, shorten ion diffusion paths, and improve material conductivity. On the other hand, the microscale is beneficial for the stability of long-range electron transport networks and avoids nanostructure aggregation. Therefore, it exhibits high specific capacity and good cycle performance in electrochemical performance. In terms of production, the raw materials used are inexpensive, the equipment is simple, energy consumption is low, the production time is short, and safety is high; the overall technical solution has the advantages of green production.

The invention provides a method for synthesizing large-particle aluminum-doped cobaltosic oxide by a continuous method, which comprises the following steps of: adding a cobalt salt solution, an aluminum salt solution and a sodium hydroxide solution into a base solution of a reaction kettle in a parallel flow manner, reacting at the reaction temperature of 30-80 DEG C, controlling the pH value in the reaction process to be 9-11, continuously flowing the reacted material out of the reaction kettle, entering a finished product tank, demagnetizing, filter-pressing, washing and calcining to obtain aluminum-doped cobaltosic oxide; wherein the flow of the cobalt salt solution is V1, the flow of the aluminum salt solution is V2, the flow of the sodium hydroxide is V3, 0.4 < = V3 / V1 < = 0.6, and 0.9 < = (V2 + V3) / V1 < = 1.1. The cobaltosic oxide which is uniform in particle size, good in dispersity, high in tap density and uniform in aluminum element doping is obtained through a continuous method synthesis process and accurate matching of raw material flow control, and the preparation method is easy to operate and low in cost and has a good industrial application prospect.

The invention discloses a method for preparing a cobalt oxide nanorod catalyst for oxygen evolution by recycling waste 3C lithium batteries, and relates to the technical field of recycling conversion of waste lithium batteries. Aiming at the problems in the prior art that the waste lithium battery is easy to explode during mechanical crushing, the strong acid leaching pollution is large, the additional value of the recovered product is low and the like, a pre-discharge-liquid nitrogen flash freezing synergistic pretreatment technology is innovatively adopted, and a multi-stage physical field separation system is combined to realize efficient separation of the positive electrode material; cobalt and lithium are selectively extracted through an organic weak acid directional leaching system, and equipment corrosion and toxic gas release are avoided; and extracting and separating the leachate through a solvent to obtain a high-purity lithium salt and a divalent cobalt solution, and synthesizing the Co3O4 nanorod with specific (112) crystal face orientation by a regulated and controlled one-step hydrothermal method. The catalyst shows low overpotential, high Tafel slope and cycling stability superior to commercial IrO2 at the current density of 10mA / cm < 2 > in alkaline electrolyte. According to the technology, the cobalt recovery rate is larger than or equal to 95%, the lithium recovery rate is larger than or equal to 90%, and double benefits of electronic waste green treatment and new energy material low-cost preparation are achieved.

It relates to a material comprising a plurality of nanorods encapsulated within open-ended hollow carbon nanostructures, wherein the plurality of nanorods is composed of either a) a transition metal oxide of the formula AzM'2 yMn1 -xO2 (A), or alternatively, b) a transition metal oxide of the formula M''3m / nM2-mO3 (B), as defined herein, wherein the transition metal oxide of the formula (A) or formula (B) is in an amount from 20 to 60% by weight with respect to the total material weight; and the volume of the nanorods encapsulated within hollow carbon nanostructures is equal to or less than 50% with respect of the total cavity volume of the hollow carbon nanostructures, in particular, wherein the hollow carbon nanostructures are tubular and their internal average diameter is at least 2 times the average thickness of the nanorods. It also relates to a process for preparing this material, to a precursor material RtM'''3-tO4 (C) as defined herein from which the material is obtained, and to the use of the material as electrocatalyst in different applications.

The application belongs to the technical field of electrolytic cell catalyst formula, and particularly relates to an electrolytic cell catalyst formula and preparation process for hydrogen production by electrolysis of municipal sewage, which comprises an anode catalyst and a cathode catalyst, the anode catalyst is a Co3O4-Ni doped catalyst, the molar ratio of Co to Ni is 3:1, and the carrier is porous carbon; the cathode catalyst is a Co3O4-Mo doped catalyst, the molar ratio of Co to Mo is 4:1, and the carrier is porous carbon; the particle size of the porous carbon is 50-100 mu m, the specific surface area is 800-1000 m2 / g, and the conductivity is >10^3 S / cm.

Calcining a mixed metal oxide composition to form a cathode material. The mixed metal oxide composition is one formed by mixing (i) a metal-containing precursor and (ii) a lithium precursor comprising lithium peroxide (Li2O2), lithium hydroperoxide (LiOOH), lithium peroxide monoperoxohydrate trihydrate (Li2O2. H2O2.3H2O) or a mixture of any two or more of the foregoing. The cathode material formed comprises a compound having the formula (II): qLi2MnO3·(1-q)LiNiaMnbCocMyO2+z (II) wherein 0≤ q ≤0.8, c = 1-a-b, 0≤a≤1, 0≤ y≤ 0.05, -0.025≤ z≤0.125, and M is selected from the group consisting of Al, Mg, Ti, Mo, Nb, Zr. Hf, Ta, W, B, P, F and a combination of any two or more of the foregoing.

The present invention belongs to the technical field of lithium ion battery positive electrode materials, and disclosed are a preparation method for a nano lithium cobalt oxide positive electrode mate