71 results about "Lithium ferrite" patented technology

The invention provides a new energy hybrid power generation technology formed by mutually complementing a solar power generation technology with a diesel power generation technology, and composed of a storage battery (plumbic acid or lithium ferrite) energy storage technology. The new energy hybrid power generation technology provides a new energy solution for remote areas, islands and the like, and is an important alternative scheme for the existing diesel power generation scheme in some districts. According to the new energy hybrid power generation technology, solar energy is used for supplying power and charging a storage battery in case of sufficient solar energy; the storage battery provides a discharge support load in the case that the solar energy cannot be met; the capacity of the storage battery is detected, and a diesel power generator is automatically started up to supply power in the case that the capacity of the storage battery is insufficient; the diesel power generator is automatically turned off when it is detected that the capacity of the storage battery is recovered to a certain extent. The system overcomes the problems of a high use cost, a high noise pollution and the like of a pure diesel power generator, and also avoids the problems of a too high initial investment and a low system reliability in extreme weather of a pure solar power generator. The power supply system generates power mainly by virtue of the solar energy, uses the diesel for standby, and is capable of intelligently control, contravariant and management to increase energy conversion and use efficiency; the overall system provided by the invention provides a cheap and reliable energy solution.

The invention relates to a lithium battery anode material based on lithium ferrite as well as a preparation method and application thereof and belongs to the field of preparation and application of lithium ion battery electrode materials. The lithium battery anode material based on lithium ferrite comprises lithium ferrite as well as conductive carbon, a binder and a solvent, wherein a chemical formula of lithium ferrite is Li2Fe3O5, morphology of lithium ferrite is particles of an octahedral structure, and particle size is 0.2-10[mu]m. The preparation method of the lithium battery anode material comprises the following steps: mixing all the substances, and stirring, so that the lithium battery anode material is obtained. A lithium battery can be prepared by adopting the anode material. The method provided by the invention prepares a lithium ion anode material on the basis of a lithium ferrite material of the octahedral structure, not only conductivity is improved, but also great volume change of lithium ions in intercalation and deintercalation processes is alleviated, so that electrochemical stability of the lithium ion anode material is improved, the problem that graphite has relatively low theoretical specific capacity when being taken as the traditional lithium ion battery anode material can be thoroughly solved, and the development obstacle that specific capacity of a lithium ion battery is relatively low is overcome.

The invention relates to the method for manufacturing the secondary battery, especially, for composing lithium ferrate used as the material of positive electrode in the lithium ion battery. The admixture of the lithium oxide and the oxide of iron or nitrate being as the initiator are put in the ball mill throug hthe mechanical ball milling so as to obtain the lithium ferrate with purity 85%-99%, the grain size 30 nano to 100 micros. The mechanical ball milling condition is as following: the mass ratio between the balls and the materials 1.5:1-2.5:1, the rotation speed 200-400 rmp/min, the time 10-50 hours, then keeping the constant temp 5-20 hours in 400 deg.C-800 deg.C under oxygen atmosphere. The invention features simple technical procedures and equipment, the high purity.

The invention discloses a method for preparing a xa-fluorine lithium ferrite and carbon nano-tube composite material. The method includes dissolving 20 grams of iron nitrate nonahydrate in 200 milliliters of deionized water, adding 5 milligrams of cetyl trimethyl ammonium bromide into the deionized water and continuously stirring the cetyl trimethyl ammonium bromide in the deionized water for 3 hours to obtain saturated solution; adding 0.1 gram of carbon nano-tubes into 20 milliliters of 1 mole/liter sodium hydroxide solution, stirring the carbon nano-tubes in the sodium hydroxide solution, cleaning the carbon-tubes by the aid of deionized water until the carbon nano-tubes is neutral and carrying out centrifugal suction filtration on the carbon nano-tubes; adding the treated carbon nano-tubes into 20 milliliters of 40% hydrofluoric acid solution, stirring the carbon nano-tubes in the hydrofluoric acid solution to obtain uniformly dispersed carbon nano-tube-hydrofluoric acid solution; adding the obtained carbon nano-tube-hydrofluoric acid solution and 5.6 grams of lithium carbonate powder into iron nitrate-cetyl trimethyl ammonium bromide solution and continuously stirring the obtained carbon nano-tube-hydrofluoric acid solution and the lithium carbonate powder in the iron nitrate-cetyl trimethyl ammonium bromide solution to obtain black precipitates; cleaning and centrifuging the obtained black precipitates by the aid of isopropyl alcohol by four times and then drying the black precipitates in an air blast drying oven at the temperature of 80 DEG C for 10 hours to obtain the hexa-fluorine lithium ferrite and carbon nano-tube composite material. The method has the advantage that the hexa-fluorine lithium ferrite and carbon nano-tube composite material is excellent in electric conductivity and can be used as an anode material for lithium ion batteries.

The invention discloses a preparation method of nano lithium ferrite. The preparation method comprises: preparing a ferrous solution and a lithium bicarbonate solution; adding a base solution into a reaction kettle; adding the ferrous solution, the lithium bicarbonate solution and an acid-base regulator into the reaction kettle, and reacting to obtain slurry; transferring the slurry into a high-pressure reaction kettle, stirring reaction for 3-5 min at the temperature of 220-250 DEG C under pressure of 0.6-0.9 MPa, after cooling and pressure relief, taking out the material, filtering, and washing to obtain a precipitate; putting the precipitate into a roller bed furnace, calcining for 5-8 h at the temperature of 400-500 DEG C, introducing air in the calcining process, and maintaining the flow velocity of gas in the calcining furnace at 2-3 m/S, and then cooling the calcined material, carrying out air flow crushing, carrying out grading by virtue of a grading wheel, and screening to remove iron, so as to obtain the nano lithium ferrite. The preparation method is simple in process and low in cost, and the obtained nano lithium ferrite is large in specific surface area and uniform inparticle size distribution.

The invention provides a preparation method and application of lithium cobalt oxide with a pre-lithiated core-shell structure. The method comprises the following steps: (1) preparing carbon nanotube loaded doped lithium ferrite Li5FenX(1-n)O4; (2) preparing surface self-assembled film modified carbon nanotube loaded doped lithium ferrite Li5FenX(1-n)O4; (3) preparing a lithium cobalt oxide precursor crystal seed cobaltate MCo2O4; (4) preparing a lithium cobalt oxide precursor; (5) preparing lithium cobalt oxide; (6) preparing surface coated lithium cobalt oxide; and (7) preparing surface nitride coated lithium cobalt oxide. According to the lithium cobalt oxide with the pre-lithiated core-shell structure, the cobaltate is adopted as a seed crystal, and the lithium cobalt oxide precursor is prepared and generated in an aqueous solution in a carbon nanotube loaded pre-lithiated positive electrode material doped lithium ferrite self-assembly mode; and a titanium-containing oxide coating layer is prepared, and nitridation reaction is carried out to generate coated lithium cobalt oxide containing titanium nitride and oxide.

The invention discloses an all-solid-state film battery with high energy density. The all-solid-state film battery comprises a substrate material layer, a metal current collecting layer I, an anode active material layer, an electrolyte film layer, a cathode active material layer and a metal current collecting layer II, wherein the anode active material layer and the cathode active material layer are composed of a plurality of layers of composite films respectively, and are alternately grown through the vacuum deposition technology; the anode active material is formed by mixing lithium titanate with lithium ferrite; the cathode active material is formed by mixing lithium cobaltate with lithium manganate. The invention also discloses a preparation method of the all-solid-state film battery. The prepared all-solid-state film battery is high in energy density, good in stability and long in service life.

The invention relates to a garnet ferrite material applied to a high-power phase shifter and a preparing method thereof. The garnet ferrite material is prepared from, by weight, 35-37% of Y2O3, 13-15% of Gd2O3, 1-3% of Al2O3, 1-3% of Mn2CO3 and 45-47% of Fe2O3; the method comprises the steps of weighing and mixing according to the weight ratio, primary ball milling, drying, screening, presintering, secondary ball milling, drying, pelletizing, pressing forming and sintering. Compared with a lithium ferrite material, the garnet ferrite material prepared by utilizing the method has the advantages of being high in density, small in porosity and small in effective line width and the like.

The invention discloses a preparation method of phosphorus-doped lithium nickel cobalt ferrite. The preparation method comprises the steps: adding a nickel-cobalt solution into an ammonium bicarbonatesolution, reacting, filtering and washing to obtain nickel-cobalt carbonate precipitate; adding the nickel-cobalt carbonate precipitate into a phosphoric acid solution, and stirring for reaction to obtain a phosphate radical doped nickel-cobalt precipitate; adding the phosphate radical doped nickel-cobalt precipitate into a polyethylene glycol solution and a lithium bicarbonate solution, stirring, slurrying, carrying out spray drying, and carrying out primary calcination to obtain a primary calcined material; adding ferrous salt and lithium salt into the primary calcined material, then addingwater, adding an ammonium carbonate solution and an acid solution after grinding and levigating are conducted, filtering, washing and drying, and obtaining a reaction material; and carrying out high-temperature calcination on the reaction material in an air atmosphere to obtain a secondary calcined material, carrying out jet milling on the secondary calcined material, screening to remove iron, and carrying out vacuum packaging to obtain the phosphorus-doped lithium nickel cobalt ferrite. The conductivity can be improved through phosphorus-doped lithium nickel cobalt oxide so that the structure stability is better, and the product capacity and the cycle performance are excellent.

The invention relates to a lithium ion battery cathode material and a preparation method, and solves problem of further increasing integral capacity of battery. The lithium ion battery cathode material of the invention is ferroferric oxide/lithium ferrate/lithium oxide composite powder, which is prepared by adding prefabricated xerogel powder into solution to initiate polymer monomer polymerization to obtain macromolecular gel, and carrying out thermal decomposition of the obtained gel to obtain the composite powder with uniformly distributed particle size and stable performance. The lithium ion battery cathode can be prepared from the composite powder or mixture of the composite powder and graphite. The invention has high specific capacity which is more than 1000mAh/g and is about three times of that of existing graphite cathode (theoretical capacity is 372mAh/g, and practical capacity is 340mAh/g), and simple method, is easy for large scale production, can form gel at room temperature, and can initiate polymerization without additional initiator, heat source and radiation source.

The invention provides a polymer-coated lithium battery positive electrode material and a preparation method thereof. The preparation method comprises the following steps: a lithium battery positive electrode material and a polymer solution are uniformly mixed, and a solvent of the polymer solution is an organic solvent; heating and pressurizing reaction is carried out, so that the surface of the lithium battery positive electrode material is coated with the polymer, solid-liquid separation is carried out, an obtained solid is sintered in an inert atmosphere at 80-300 DEG C, and the polymer-coated lithium battery positive electrode material is obtained. According to the preparation method provided by the invention, the lithium battery positive electrode material is not in contact with water and carbon dioxide in the whole process, and a carbonization layer is not formed finally, so that compared with the existing high-temperature carbon coating, the preparation method provided by the invention is beneficial to ensuring the stability of lithium ferrite and other lithium battery positive electrode materials which are easy to react with water and carbon dioxide and are easy to reduce, and the energy consumption is lower.

The invention relates to a method for preparing lithium ferrite anticorrosive coatings by flame spraying. Lithium ferrite conductive anticorrosive coating materials, prepared by adopting a manipulator through optimizing the technological parameters of oxygen-acetylene flame spraying, have excellent corrosion resistance and conductivity. The preparation method, provided by the invention, has the advantages of simple process, high deposition rate, strong repeatability and low facility request, can directly implement the spraying construction on site so as to meet the construction and repair requirements of actual grounding network engineering, and can be applied to metallic matrix surfaces with different shapes or different sizes; in particular, the preparation method has more advantages when preparing large-area anticorrosive conductive coatings for practical application; and meanwhile, the maintenance is simple in the workpiece service process, so that the preparation method is suitable for industrial popularization and application.

The invention discloses a preparation method of doped lithium iron oxide, and belongs to the technical field of new energy. The preparation method comprises following steps: a lithium hydrogencarbonate solution, an ammonium ferrous sulfate solution, a titanyl sulfate solution, and an acidifying or alkalizing agent are mixed, and are added into a base solution, wherein in the adding process, the pHvalue is maintained to be 7 to 7.5, the temperature is controlled to be 50 to 60 DEG C, and the stirring speed is controlled to be 300 to 400r/min; after material adding, the temperature is increasedto 90 to 95 DEG C, stirring reaction is carried out for 30 to 60min, and filtering washing are carried out to obtain a precipitate; the precipitate is subjected to drying, is introduced into a rotarykiln for calcining at 700 to 900 DEG C for 8 to 10h to obtain a calcined product, wherein air is introduced in calcining; and the calcined product is subjected to crushing, sieving, and removing of iron to obtain the doped lithium iron oxide. According to the preparation method, preparation of the doped lithium iron oxide can be realized, the surface area is large, the activity is high, and the surface is of a porous structure.

The invention discloses a preparation method of a photocatalytic lithium ferrite-titanium oxide composite block which is prepared from lithium ferrite battery waste. The preparation method comprises the following steps: step 1, crushing and sieving a positive pole piece of the lithium ferrite battery waste to enable the particle size to be not greater than 70 meshes, and roasting at 400-600 DEG Cfor not less than 1 hour to obtain lithium ferrite positive pole powder; step 2, granulating the lithium ferrite positive electrode powder, pressing into a block, and sintering at 900-1200 DEG C for 4-6 hours to obtain a lithium ferrite block; step 3, carrying out chemical vapor deposition on the lithium ferrite block to obtain the titanium oxide coating; and step 4, carrying out heat preservationat 350-400 DEG C in an air atmosphere for 2-3 h to obtain the photocatalytic lithium ferrite-titanium oxide composite block. The invention also discloses the photocatalytic lithium ferrite-titanium oxide composite block prepared by the method. According to the method, the photocatalytic lithium ferrite-titanium oxide composite block is prepared by taking the lithium ferrite battery waste as a rawmaterial, and an aluminum matrix is taken as a sintering agent so that the reaction is more thorough, and more energy is saved. The internal microstructure of the photocatalytic lithium ferrite-titanium oxide composite block prepared by the method is loose and porous, and the photocatalytic activity is high.