Abstract: The present disclosure discloses a method for preparing a ternary cathode precursor material with low sulfur content and high specific surface area, and belongs to the field of lithium ion battery materials. In the present disclosure, by using a continuous filter with a spraying device for concentrating a reaction material, sulfur impurities can be uniformly removed in a reaction stage, and neither are the reaction environment and the production efficiency affected, nor does introduction of new impurities occur. In addition, by removing the mother liquor by means of negative pressure suction filtration, the material can be oxidized uniformly in a controlled manner, and the specific surface area of the ternary cathode precursor material is uniformly increased, so that during sintering, lithium ions more easily enter the interior of particles of the ternary cathode precursor material, thus exerting a higher capacity.

Abstract: Disclosed are a manganese-doped cobaltosic tetroxide, and a preparation method and application thereof, belonging to the field of battery materials. The preparation method of the manganese-doped cobaltosic tetroxide of the disclosure dopes a manganese element into cobalt carbonate with a specific process and matched with a composite surfactant, which can obtain manganese-doped cobaltosic tetroxide particle products with uniform particle size, dispersion and fineness through high-temperature sintering, a proportion of low-valence manganese in the doped manganese is high, and a crystal form of the products obtained by sintering is complete. The preparation method is simple in operation and can realize industrial large-scale production. The manganese-doped cobaltosic tetroxide prepared by the preparation method and the application thereof are also disclosed.

Abstract: A method includes: (1) adding a food-grade manganese sulfate solution and a complexing agent solution into a sodium ferrocyanide solution for a precipitation reaction to generate Prussian white crystal nucleus; (2) replacing the food-grade manganese sulfate solution with an industrial-grade manganese sulfate solution, and keeping other conditions unchanged, so that the Prussian white crystal nucleus grow continuously to obtain a slurry; and (3) successively subjecting the slurry to an aging reaction, solid-liquid separation, washing and drying to obtain a Prussian white product with a specific particle size. The food-grade manganese sulfate solution, and the sodium ferrocyanide solution are subjected to the precipitation reaction, and then the industrial-grade manganese sulfate solution are added to continue a precipitation reaction. The particle size of the Prussian white is regulated by controlling an adding time of the two manganese sulfate solutions.

Abstract: A compositely coated ternary precursor, and a preparation method therefor and use thereof are provided. The material includes a ternary precursor and a coating layer attached to a surface of the ternary precursor, wherein the coating layer is obtained from a precipitation reaction of a first metal ion and a first polyanion. The metal ion and the polyanion can undergo a precipitation reaction to form a precipitate, to form a uniformly distributed coating layer on the surface of the ternary precursor. After the coated precursor is sintered into a cathode material, part of the coating can form a protective layer on the surface of the material; and the other part of the coating can permeate into the material to form bulk phase doping.

Abstract: Provided is a treatment method of waste water containing ferricyanide complex and oxalate, comprising under the condition of weak acidity to weak alkalinity, firstly adding an appropriate amount of divalent manganese ions to make the divalent manganese ions combined with ferrocyanide ions and part of oxalate ions in wastewater to form a mixed slag mainly composed of manganese ferrocyanide to achieve the purpose of removing most of the cyanide and a small amount of organic substance; adding excess divalent manganese ions to the first filtrate to make the divalent manganese ions fully combined with the oxalate in the wastewater to achieve the purpose of removing organic substance, and then adding an appropriate amount of alkali to the second filtrate to form precipitation to achieve the purpose of recovering manganese; then adding an appropriate amount of ferrous salt to achieve the purpose of removing the remaining cyanide and organic substance.

Abstract: The present disclosure discloses a method for preparing a ternary cathode precursor material with low sulfur content and high specific surface area, and belongs to the field of lithium ion battery materials. In the present disclosure, by using a continuous filter with a spraying device for concentrating a reaction material, sulfur impurities can be uniformly removed in a reaction stage, and neither are the reaction environment and the production efficiency affected, nor does introduction of new impurities occur. In addition, by removing the mother liquor by means of negative pressure suction filtration, the material can be oxidized uniformly in a controlled manner, and the specific surface area of the ternary cathode precursor material is uniformly increased, so that during sintering, lithium ions more easily enter the interior of particles of the ternary cathode precursor material, thus exerting a higher capacity.

Abstract: Provided is a treatment method of waste water containing ferricyanide complex and oxalate, comprising under the condition of weak acidity to weak alkalinity, firstly adding an appropriate amount of divalent manganese ions to make the divalent manganese ions combined with ferrocyanide ions and part of oxalate ions in wastewater to form a mixed slag mainly composed of manganese ferrocyanide to achieve the purpose of removing most of the cyanide and a small amount of organic substance; adding excess divalent manganese ions to the first filtrate to make the divalent manganese ions fully combined with the oxalate in the wastewater to achieve the purpose of removing organic substance, and then adding an appropriate amount of alkali to the second filtrate to form precipitation to achieve the purpose of recovering manganese; then adding an appropriate amount of ferrous salt to achieve the purpose of removing the remaining cyanide and organic substance.

Abstract: Disclosed are a manganese-doped cobaltosic tetroxide, and a preparation method and application thereof, belonging to the field of battery materials. The preparation method of the manganese-doped cobaltosic tetroxide of the disclosure dopes a manganese element into cobalt carbonate with a specific process and matched with a composite surfactant, which can obtain manganese-doped cobaltosic tetroxide particle products with uniform particle size, dispersion and fineness through high-temperature sintering, a proportion of low-valence manganese in the doped manganese is high, and a crystal form of the products obtained by sintering is complete. The preparation method is simple in operation and can realize industrial large-scale production. The manganese-doped cobaltosic tetroxide prepared by the preparation method and the application thereof are also disclosed.

Abstract: A method for regulating a particle size of Prussian white, includes (1) adding a food-grade manganese sulfate solution and a complexing agent solution into a sodium ferrocyanide solution for a precipitation reaction to generate Prussian white crystal nucleus; (2) replacing the food-grade manganese sulfate solution with an industrial-grade manganese sulfate solution, and keeping other conditions unchanged, so that the Prussian white crystal nucleus grow continuously to obtain a slurry; and (3) successively subjecting the slurry to an aging reaction, solid-liquid separation, washing and drying to obtain a Prussian white product with a specific particle size. The food-grade manganese sulfate solution, and the sodium ferrocyanide solution are subjected to the precipitation reaction, and then the industrial-grade manganese sulfate solution are added to continue a precipitation reaction.

Abstract: The present disclosure discloses a preparation method of a Ni-Rich ternary precursor and use thereof. The preparation method includes the following steps: under specified conditions, feeding an alkali liquor and a metal salt solution simultaneously for a precipitation reaction to obtain particles with D50 of 7.0 ?m to 15.0 ?m; continuously feeding a seed crystal, and after D10 of the particles is adjusted to 2.0 ?m to 7.0 ?m, stopping feeding the seed crystal; continuously feeding the alkali liquor and the metal salt solution, and collecting an overflow material; and when a particle size grows to D50 of 7.0 ?m to 15.0 ?m once again, repeating the above operation of adding a seed crystal, and continuously collecting an overflow material; and washing, drying, and sieving the collected materials to obtain the Ni-Rich ternary precursor.

Abstract: The present disclosure discloses a preparation method of a ternary precursor, including: S1: mixing a first metal salt solution with a soluble nickel salt, a soluble cobalt salt, and a soluble manganese salt, ammonia water, and a sodium hydroxide solution, adjusting a pH, and heating and stirring a resulting mixture to allow a reaction; and aging and filtering a resulting slurry to obtain a precursor seed crystal; S2: adding the precursor seed crystal to a dilute acid solution, and stirring and filtering a resulting mixture to obtain an acidified seed crystal; and S3: mixing a second metal salt solution with a soluble nickel salt, a soluble cobalt salt, and a soluble manganese salt, a sodium hydroxide solution, and the acidified seed crystal, adjusting a pH, and heating and stirring a resulting mixture to allow a reaction; and aging, filtering, and drying a resulting slurry to obtain the ternary precursor.

Abstract: The present disclosure belongs to the technical field of metal oxide materials, and discloses a synthesis method of cobalt hydroxide and cobalt hydroxide. The synthesis method includes: (1) stirring and heating ammonium citrate, introducing a protective gas, adding a cobalt salt and a mixed alkali liquor to allow a reaction, and adjusting a pH to obtain a cobalt hydroxide slurry; and (2) subjecting the cobalt hydroxide slurry to alkali-leaching, filtering, and slurrying a resulting filter residue; and washing a resulting slurry with a detergent, and drying the resulting slurry to obtain the cobalt hydroxide. In the present disclosure, ammonium citrate is used as a base solution, and a cobalt solution and a mixed alkali liquor are added to synthesize a cobalt hydroxide slurry in one step under a protective atmosphere.

Abstract: The present invention discloses a radially-structured nickel-based precursor and a preparation method thereof. An overall shape of the precursor is a secondary sphere formed by agglomeration of primary crystal grains; and the secondary sphere has a loose and porous network core inside and uniform and regular strip primary crystal grains outside, and the strip primary crystal grains grow outward perpendicularly to a surface of the core and are arranged radially and closely. The precursor structure of the present invention is more suitable for high-power battery cathode materials. The internal loose structure is more likely to form a void in the center during a preparation process of a cathode material, which helps to expand a contact area between an active material and an electrolyte.

Abstract: The present disclosure discloses a preparation method of platy aluminum-doped cobalt carbonate and use thereof. The preparation method includes the following steps: S1: mixing a cobalt salt, an aluminum salt, and a polyhydroxy compound to prepare a mixed solution; S2: mixing the mixed solution with an ammonium bicarbonate solution, adjusting a pH, and heating and stirring to allow a reaction to obtain a seed crystal solution; and S3: adding the mixed solution and an ammonium bicarbonate solution to the seed crystal solution, adjusting a pH, and heating and stirring to allow a reaction, during which a solid content in a slurry is controlled at 20% to 40% until a particle size in the slurry grows to a target value; and separating out, washing, and drying a solid phase to obtain the platy aluminum-doped cobalt carbonate.

Abstract: The invention belongs to the technical field of lithium ion battery cathode materials, and discloses a preparation method and application of nanosized lithium cobalt oxide cathode materials, comprising the following steps: mixing the carbonate solution with a dispersant, adding a cobalt salt solution to react, then aging, filtering, drying the filter residue to obtain a nano-CoCO3 powder, and then calcinating it to obtain a Co3O4 precursor; mixing the Co3O4 precursor with a lithium salt, and then sintering, cooling, pulverizing and sieving to obtain the nanosized lithium cobalt oxide cathode material. The main advantages of the present invention are that the nano-CoCO3 synthesis process is simple and easy to control, the process is short, no special temperature control is required, the pH value and other conditions are not required to be precisely controlled during the reaction process, and it is suitable for large-scale industrial production.

Abstract: Disclosed are a preparation method and application of iron phosphate. The preparation method comprises: subjecting iron phosphate waste to calcination, dissolving it in an acid solution, and filtering to obtain filtrate, namely a solution A containing iron phosphorus; stirring a mixed solution of the solution A and a first alkali solution, adjusting pH of the mixed solution to acidity for reaction, and after washing and filtering to obtain second filter residue, namely an amorphous yellow iron phosphate filter cake; subjecting the yellow iron phosphate filter cake to aging and heating, adding phosphoric acid and a second alkali solution for reaction, followed by washing and filtering to obtain third filter residue, namely a basic ammonium iron phosphate filter cake, then drying to obtain basic ammonium iron phosphate crystal powder; and subjecting the basic ammonium iron phosphate crystal powder to calcination for dehydration and cooling to obtain iron phosphate.