55 results about "Lithium acetate" patented technology

The invention relates to the technical field of metal material hot working, and discloses a hot-rolled coiled plate production process which comprises the following steps: preparing a reaction type protective agent, the high-temperature-resistant coating is prepared from the following raw materials in parts by weight: 20 to 40 parts of tetraethoxysilane, 5 to 15 parts of triethyl phosphate, 1 to 5 parts of triethyl borate, 0.5 to 2.0 parts of cerous nitrate (III) hexahydrate, 0.1 to 1.0 part of lithium acetate and 0.01 to 0.05 part of vanadyl acetylacetonate (IV). Coating the surface of a hot-rolled plate blank with the protective agent; the coated plate blank is heated in a heating furnace, so that the protective agent forms a molten-state protective layer in situ; carrying out hot rolling on the plate blank with the molten protective layer; and cooling and coiling the hot-rolled steel strip. In the whole heating and hot rolling process, the molten protective layer isolates the contact between the steel and the oxidizing atmosphere, so that the generation of oxide scales is fundamentally inhibited, the production process is simplified, and the metal yield is increased.

The invention belongs to the technical field of floor support plates, and particularly relates to a material for a concrete floor support plate, which is prepared from 150 to 170 parts of cement, 30 to 35 parts of mineral admixture, 200 to 250 parts of sand, 100 to 120 parts of gravel, 40 to 45 parts of fiber, 5 to 10 parts of early strength agent and 140 to 150 parts of water. The early strength agent comprises the following components in parts by weight: 20-30 parts of a polycarboxylate superplasticizer, 5-10 parts of modified nano zeolite powder, 5-9 parts of lithium acetate, 3-5 parts of a complexing agent, 5-10 parts of calcium sulfate and 1-4 parts of diisopropanolamine. The fibers, the mineral admixture and the early strength agent are added into the formula, early hydration of cement is promoted, dry shrinkage and cracking caused by too fast later hydration of cement are avoided, the compressive strength and breaking strength of the concrete floor support plate are effectively improved, the maintenance period of the concrete floor support plate is shortened, and the production cost is reduced.

The invention discloses a lithium-rich manganese-based positive electrode material and a preparation method, and relates to the technical field of lithium ion battery positive electrode materials, and the preparation method comprises the following steps: jointly dropwise adding a lithium acetate aqueous solution and a transition metal salt aqueous solution into a citric acid aqueous solution, maintaining the reaction temperature, and continuously stirring to form gel; and carrying out secondary calcination on the gel to obtain a lithium-rich manganese-based positive electrode material precursor, carrying out high shear stress and heat treatment combined treatment on the lithium-rich manganese-based positive electrode material precursor, washing, and drying to finally obtain the lithium-rich manganese-based positive electrode material. The lithium-rich manganese-based positive electrode material is prepared by adopting a sol-gel method, a two-step calcination method and a high shear stress and heat treatment combined mode, lattice oxygen can be stabilized by introducing oxygen vacancies, and the cycling stability is improved; by introducing the lithium vacancy, the migration energy of lithium ions can be reduced, the migration of the lithium ions is accelerated, and the rate capability is improved; the generation of the disordered layer hinders the contact between the electrolyte and the internal material, the reaction between the material and the electrolyte is reduced, the stress caused by lattice distortion is relieved by the internal local disorder, and the stability of the material is enhanced. The lithium-rich manganese-based positive electrode material prepared by the invention is applied to a lithium ion battery and shows excellent electrochemical performance, and the preparation method hardly generates waste liquid and shows the characteristic of environmental friendliness.

The invention discloses a polydopamine modified metatitanic acid type lithium ion sieve and a preparation method thereof, and belongs to the technical field of lithium ion sieves, the preparation method comprises the following steps: grinding and uniformly mixing lithium acetate dihydrate and titanium dioxide in an organic solvent, and calcining the mixture at 650-800 DEG C for 3-5 hours to prepare a Li2TiO3 precursor; the preparation method comprises the following steps: putting dopamine hydrochloride, aminated crown ether and a Li2TiO3 precursor into a tris (hydroxymethyl) aminomethane solution with the pH value of 8-9, carrying out a constant-temperature oscillation reaction, carrying out suction filtration, and drying at low temperature, so as to obtain the polydopamine modified metatitanic acid type lithium ion sieve. According to the lithium ion sieve, the adsorption effect on lithium ions can be improved, the lithium extraction efficiency is improved, and the problem of low adsorption capacity of a lithium ion sieve in the prior art is solved.

The invention discloses a modified lithium titanate negative electrode material and a preparation method thereof, a negative electrode plate, a battery and an electric device, and belongs to the field of energy and the field of new materials. The preparation method of the modified lithium titanate negative electrode material comprises the following steps: carrying out first reaction on lithium salt and first glacial acetic acid in a first solvent to prepare a lithium acetate solution; zirconium salt and second glacial acetic acid are subjected to first mixing in a second solvent, and a zirconium salt solution is formed; performing second mixing on the lithium acetate solution and the zirconium salt solution to form a lithium-zirconium mixed solution; performing third mixing on the lithium-zirconium mixed solution and a titanium source to form lithium-titanium-zirconium sol; and drying and calcining the lithium-titanium-zirconium sol to form the modified lithium titanate negative electrode material. According to the preparation method, the zirconium element is adopted for doping, meanwhile, a homogeneous phase mixing reaction process is matched, and a high-energy grinding process is not needed, so that uniform mixing of the raw materials on the molecular level can be realized, the high-rate charge-discharge capacity and the first efficiency are improved, and the probability of gas production of the battery is reduced.

The invention discloses a preparation method for synthesizing a lithium battery positive electrode material by a solvent-free solid-phase method, particularly relates to the technical field of electrochemistry, and relates to the preparation method for synthesizing the lithium battery positive electrode material by the solvent-free solid-phase method. The lithium battery positive electrode material synthesized by the solvent-free solid-phase method is prepared from lithium acetate, nickel cobaltate, manganese cobaltate and a composite functional agent; the preparation raw materials of the lithium battery positive electrode material synthesized by the solvent-free solid phase method comprise the following components in parts by mass: 100 parts of lithium acetate, 74.3-97.2 parts of nickel cobaltate, 4.0-18.5 parts of manganese cobaltate and 6.8-14.6 parts of a composite functional agent, by adopting lithium acetate as a clean lithium source and combining with a solvent-free solid-phase synthesis method assisted by a composite functional agent, organic solvent pollution and harmful gas emission are eliminated from the source, and the lithium acetate is decomposed at a low temperature without solid residues by utilizing the characteristic of lithium acetate without solid residues and cooperating with a reducing atmosphere generated by decomposition of organic components in the functional agent, so that the lithium-ion battery cathode material is obtained. And the problem of pollution caused by high-temperature decomposition of the lithium salt in the traditional process is effectively avoided.

This invention discloses a process for preparing ultrafine glass powder using a spray pyrolysis method in the field of glass encapsulation materials. The process first prepares a homogeneous solution A using boric acid, aluminum nitrate nonahydrate, alkaline earth metal nitrates, lithium acetate, sodium acetate, and potassium acetate. Tetraethyl orthosilicate is dissolved in anhydrous ethanol to obtain solution B. A rare earth transition metal composite oxide nanoclusters encapsulated with a silica shell hybrid inorganic modifier is dispersed in anhydrous ethanol to obtain suspension C. Solution B and suspension C are mixed, and deionized water and hydrochloric acid are added to adjust the pH. After pre-hydrolysis and cooling, triethyl borate is added dropwise for co-condensation, and then mixed with solution A. After adjusting the pH and aging, the mixture is ultrasonically atomized and spray pyrolyzed to obtain ultrafine glass powder. The glass powder obtained by this invention has small particle size, high sphericity, and can be continuously produced.

The invention discloses a low-temperature early-strength low-viscosity liquid accelerator and a compound production process thereof, and relates to the technical field of concrete admixtures. The accelerator is formed by compounding a basic framework component, a rheological stabilizing component and a low-temperature early strength component. The basic framework component comprises an inorganic aluminum salt coagulant, anhydrous magnesium sulfate, diethanol amine and water; the rheological stabilizing component comprises liquid polyaluminum sulfate, an amphoteric inner salt viscosity reducer and cationic nano silicon dioxide sol; the low-temperature early-strength component comprises water-soluble organic aluminum salt, zirconyl sulfate, lithium acetate and water. The amphoteric inner salt viscosity reducer is matched with the cationic nano silicon dioxide sol, so that the rheological stability of the accelerator under a low-temperature condition is improved; through cooperation of the water-soluble organic aluminum salt, the zirconyl sulfate and the lithium acetate, the early strength development capability of the accelerator under a low-temperature condition is improved.

The invention discloses a waste lithium iron phosphate battery recovery processing method, and belongs to the technical field of battery material recovery, the waste lithium iron phosphate battery recovery processing method comprises the following steps: (1) stirring and mixing a positive electrode material of a waste lithium iron phosphate battery, phosphoric acid, lithium monohydrogen phosphate and lithium dihydrogen phosphate in water to obtain a mixed solution; (2) adjusting the pH value of the mixed solution to be acidic, adding hydrogen peroxide, stirring, adding ferrite, and stirring to obtain slurry; (3) adding lithium acetate, vanadium nitrate, niobium pentoxide, polyacrylic acid or citric acid, carbon nanotubes and polytetrafluoroethylene emulsion into the slurry, stirring and mixing, dispersing, and drying to obtain a precursor; and (4) crushing the precursor, and then carrying out gradient calcination in a nitrogen-hydrogen mixed gas atmosphere to obtain the lithium iron phosphate material. The obtained lithium iron phosphate material can be directly used for preparing a lithium iron phosphate battery, and has high specific capacity and good cycle stability.

The application discloses a lithium acetate-polyethylene glycol mediated protoplast lipid nanoparticle delivery method and belongs to the technical field of biology. 2+ )concentration to improve the PEG formula, successfully delivers the lipid nanoparticle (LNP) to the protoplast of oil palm, coconut and other palm crops, the mRNA of the nanoparticle is wrapped with enhanced green fluorescent protein (eGFP), and the fluorescent protein can be directly expressed in the protoplast with the mRNA as a template without a promoter. After the LNP is delivered to the protoplast of the palm crops by the method, green fluorescent signals are detected by laser confocal microscopy. The method can be used for directly delivering target gene mRNA to the protoplast of the palm crops, and can also deliver CRISPR / Cas system protein and the like for gene editing technology research.

This invention discloses a low-temperature early-strength, low-viscosity liquid accelerator and its compounding and production process, relating to the field of concrete admixture technology. The accelerator is compounded from a basic skeleton component, a rheological stabilizing component, and a low-temperature early-strength component. The basic skeleton component includes an inorganic aluminum salt accelerator, anhydrous magnesium sulfate, diethanolamine, and water; the rheological stabilizing component includes liquid polyaluminum sulfate, an amphoteric internal salt viscosity reducer, and cationic nano-silica sol; the low-temperature early-strength component includes water-soluble organic aluminum salt, zirconium oxysulfate, lithium acetate, and water. This invention improves the rheological stability of the accelerator under low-temperature conditions through the combination of the amphoteric internal salt viscosity reducer and the cationic nano-silica sol; and improves the early strength development ability of the accelerator under low-temperature conditions through the combination of the water-soluble organic aluminum salt, zirconium oxysulfate, and lithium acetate.

The invention discloses a preparation method of a low-temperature fired infrared porous ceramic plate. The preparation method comprises the following steps: (1) preparing composite oxide powder; (2) preparing coating powder; (3) soaking the coated powder in an aqueous solution of lithium acetate, filtering, drying and calcining to obtain modified powder; and (4) uniformly mixing celsian powder, quartz powder, barium aluminum silicate powder, the composite oxide powder, the modified powder and sodium tripolyphosphate to obtain mixed powder, adding water to adjust the water content, pressing into a plate blank, drying, calcining, and cooling along with a furnace to obtain the infrared porous ceramic plate. The ceramic plate prepared by the method has good far infrared ray emissivity and strength, the application performance of the ceramic material in the aspects of decoration, heat preservation, air purification and the like is improved, and the durability of the ceramic is improved.

The invention discloses heat-resistant saccharomyces cerevisiae of a heterozygous human DNA methylation system as well as a construction method and application of the heat-resistant saccharomyces cerevisiae. The construction method comprises the following steps: determining a to-be-knocked-in saccharomyces cerevisiae target gene locus CAN1, and carrying out annular PCR amplification by taking a target sgRNA sequence as a homologous arm and an original gRNA plasmid as a template to obtain a gRNA plasmid; constructing a to-be-knocked-in gene segment, and transferring the constructed gRNA plasmid, the segment 1 and the segment 2 into BY4741-Cas9 saccharomycetes through a saccharomyces cerevisiae lithium acetate conversion method; the CRISPR plasmid is lost by adopting an iteration method to obtain a saccharomyces cerevisiae strain which is integrated into a genome and has DNA methylation modification, and the saccharomyces cerevisiae strain is named as yHL006. The invention constructs a saccharomyces cerevisiae chassis strain capable of stably expressing a DNA methylation system. Any auxotrophic selection marker is not occupied, and the complete amino acid synthesis capability and corresponding gene loci of the yeast are completely reserved. The heat stress resistance phenotype of the DNA methylation strain is verified, and the heat resistance of the yeast can be improved by the introduced DNA methylation system.

The invention belongs to the technical field of batteries, and particularly relates to a sodium-electrode layered oxide positive electrode active material and application thereof. The positive electrode active material is obtained by coating a sodium-nickel-cobalt-manganese base material with a phosphate lanthanum material. Specifically, the mass ratio of the base material to the coating material is 1: (0.0001-0.05). The composition of a base material is NaxNiaCobMncO2, x is greater than or equal to 0.8 and less than or equal to 1, a + b + c is equal to 1, and an O3 phase structure is adopted; and the coating material is composed of LaAl (PO4) 2, LaLi3 (PO4) 4 or LaFe (PO4) 2. The preparation process comprises the following steps: 1, mixing a nickel-cobalt-manganese series precursor and a sodium source material in proportion, and calcining to obtain a base material; 2, ultrasonically mixing the La < 3 + > source material, the PO4 < 3-> source material and any one of aluminum nitrate, lithium acetate and ferric sulfate in absolute ethyl alcohol to obtain a suspension; and 3, stirring and mixing a base material and the suspension, evaporating and calcining to obtain a final product. The invention solves the problem of insufficient long-cycle stability of the positive electrode material of the existing sodium-ion battery.

The application belongs to the technical field of novel green energy, and particularly discloses a kind of imitated honeycomb hydrogel, moisture power generation device and application, wherein the imitated honeycomb hydrogel is prepared by cross-linking sodium dodecyl benzene sulfonate, lithium acetate and acrylamide monomers at high temperature, the moisture power generation device comprises bottom electrode, imitated honeycomb hydrogel and top electrode from bottom to top.The imitated honeycomb hydrogel can absorb moisture in the environment and transfer ions during the power generation process through the interaction between hydrophilic groups and water molecules, and then absorb the energy generated by the phase change of water molecules to generate electric energy.The moisture power generator has high flexibility and high current density output.The complete imitated honeycomb hydrogel can be repeatedly bent to a large extent without being damaged, and the repeated bending at different angles shows its excellent mechanical strength, and electric energy can be generated at multiple bending angles, with the characteristics of no pollution, clean, sustainable, almost unlimited power generation conditions, etc.

The invention provides a piezoelectric composite material compositely integrated by high-performance piezoelectric conductive hydrogel and a biphase bone scaffold. The piezoelectric composite material is formed by compositing piezoelectric hydrogel, conductive hydrogel and a tricalcium phosphate / hydroxyapatite biphase scaffold, the piezoelectric hydrogel is formed by wrapping glycine nanofibers with a modified polymer; the conductive hydrogel is formed by complexing a polymer solution containing lithium acetate, borate ions and a hydroxyl compound. The pressure-responsive self-generating composite material which is high in conductivity, high in voltage, high in support and biodegradable is formed by integrating the pressure-conductive hydrogel and the biphase bone scaffold, construction of a composite hydrogel system which is high in voltage, high in conductivity, high in support strength and biodegradable is achieved, and the application requirement of a high-performance bone repair material system is met.

A process for producing lithium iron phosphate, comprising the following steps: S1: Dispersing a lithium salt in a prepared solvent A and adjusting a pH of a resulting dispersion to 6.5-8.5 with an organic acid to obtain a mixed solution; and dispersing a porous iron phosphate in a prepared solvent B and adding an organic carbon source to obtain a mixed slurry A; wherein the prepared solvent A and the prepared solvent B are independently water or a dispersion of a volatile solvent and water; and the lithium salt is one or more selected from the group consisting of lithium oxide, lithium carbonate, lithium acetate, lithium hydroxide, lithium hydroxide monohydrate, and lithium nitrate; S2: Adding the mixed slurry A to the mixed solution, grinding the resulting slurry to obtain a ground material, adding a dispersant to the ground material, and stirring the dispersion to obtain a mixed slurry B; and S3: Aging and drying the mixed slurry B under a pressure of 100 Pa to 1,000 Pa to obtain a dry material, and sintering the dry material in an inert atmosphere to obtain the lithium iron phosphate.

The invention discloses a lithium acetate and alkynyl passivator double-interface modified perovskite solar cell and application thereof, the cell comprises a perovskite thin film, and the perovskite thin film is coated with an alkynyl passivator shown in the following formula I. The alkynyl passivator contains a plurality of acetylenic bonds which can be subjected to pi-electron coordination with uncoordinated Pb < 2 + > in the perovskite thin film, hydrogen bonds exist between hydroxyl and I <->, and the hydroxyl and I <-> interact with excessive PbI2, so that a perovskite thin film / hole transport layer (HTL) interface is effectively passivated, interface defects are reduced, and non-radiative recombination is inhibited. # imgabs0 #

The invention relates to a construction method of a metallothionein yeast surface display engineering strain capable of efficiently enriching copper ions. According to the method, the metallothionein yeast surface display engineering strain is constructed based on a saccharomyces cerevisiae cell surface display technology. According to the method, a metallothionein gene CUP1 after codon optimization is connected to a saccharomyces cerevisiae expression vector pYD1 through the steps of double digestion, connection, transformation and the like, and a recombinant display plasmid pYD1-CUP1 is successfully constructed. A lithium acetate method is adopted to convert the recombinant display plasmid pYD1-CUP1 into tryptophan auxotroph saccharomyces cerevisiae EBY100, a plurality of recombinant transformants are obtained through MD plate screening, and screening and verification are carried out. The engineering yeast strain constructed by the method can improve the display efficiency of metallothionein on the surface of saccharomyces cerevisiae cells and enhance the enrichment capacity of the engineering strain on copper ions, so that inorganic copper is replaced by copper-enriched yeast, the side effect of copper is reduced, and the absorption and utilization rate of livestock and poultry on copper is improved.

The invention relates to a grinding aid for producing cement from volcanic ash in the East African region and a preparation method of the grinding aid, and belongs to the technical field of cement production. The additive is prepared from the following raw materials in parts by weight: 30-40 parts of oxalic acid modified triethanolamine, 0.5-2 parts of trometamol, 15-20 parts of molasses, 6-10 parts of lithium acetate and the balance of water. 0.1% of the grinding aid is used for cement production, so that the compressive strength of cement can be improved, and the fluidity of cement paste can be increased; the use amount of volcanic ash can be increased by more than 5%, so that the local cement raw material cost is reduced.

This invention discloses LiMn 0.6 Fe 0.4 This research relates to PO4 / C, its preparation method, and its applications, belonging to the field of electrode material preparation technology. A LiMn... 0.6 Fe 0.4 The preparation method of PO4 / C is as follows: manganese acetate, ferrous sulfate, ammonium dihydrogen phosphate, lithium acetate, and citric acid are dissolved in water to prepare a suspension; the suspension is ball-milled to form a nanoscale dispersion to obtain a ball-milled suspension; the ball-milled suspension is subjected to a hydrothermal reaction to obtain LiMn. 0.6 Fe 0.4 PO4 / C. This invention uses low-cost manganese acetate, ferrous sulfate, ammonium dihydrogen phosphate, lithium acetate, and citric acid as raw materials. When prepared via a hydrothermal method, no surfactants such as PEG are required. The resulting LiMn... 0.6 Fe 0.4 PO4 / C has small particle size, large specific surface area and high stability.

The invention provides an LATP solid electrolyte, a preparation method and application thereof, and a solid-state battery. According to the preparation method of the LATP solid electrolyte, brand new soluble salts including titanyl sulfate, aluminum hydroxide, lithium acetate and ammonium dihydrogen phosphate are firstly and completely dispersed in water and then stably guided into a spray dryer through the characteristic of high dispersity of an aqueous solution, and a uniformly mixed precursor is separated out through continuous dehydration in the spray drying process, so that the LATP solid electrolyte is prepared. And carrying out high-temperature sintering to obtain the LATP electrolyte. The rapid synthesis method of the LATP solid electrolyte can be realized, the sanding time of the precursor can be greatly shortened, and the production cost is reduced.

The invention relates to the field of electronic materials, and particularly discloses a low-gradient zinc oxide varistor and a preparation method thereof. The invention relates to a low-gradient zinc oxide piezoresistor disc, which is prepared from the following raw materials in parts by weight: 88 to 96 parts of zinc oxide, 1.5 to 3 parts of antimony trioxide, 2 to 5 parts of bismuth trioxide, 0.2 to 1.8 parts of nickel oxide, 0.1 to 0.9 part of cobalt sesquioxide, 0.1 to 0.4 part of manganese oxide, 0.02 to 0.07 part of chromium sesquioxide, 0.15 to 0.18 part of lithium acetate, 1.2 to 1.8 parts of dispersing agents, 1.8 to 2.5 parts of binding agents, 0.12 to 0.15 part of aluminum nitrate and 0.001 to 0.003 part of silver nitrate. Under the synergistic effect of all the components, by adjusting the use ratio of all the components, the potential gradient of the resistor disc can be reduced, the large-current endurance capacity of the resistor disc is improved, and the change of electrical performance after impact is reduced.

The present invention discloses a modification method of a titanium-based lithium ion sieve, using a titanium source and a lithium source as basic raw materials, doping a modifier, wherein the modifier is selected from any one of sulfur powder, thiourea, urea, ammonium sulfide, hexamethylenetetramine, and selenium powder; a modified lithium metatitanate precursor is prepared by solid phase synthesis, sol-gel synthesis, or hydrothermal synthesis. The titanium source is selected from any one of titanium dioxide, industrial metatitanic acid, tetrabutyl titanate, titanium tetrachloride, isopropyl titanate, titanium sulfate, and titanium nitrate. The lithium source is selected from any one of lithium hydroxide, lithium chloride, lithium carbonate, lithium acetate dihydrate, lithium oxalate, lithium fluoride, lithium bromide, lithium nitrate, and lithium sulfate. The modification method of the present invention further improves the adsorption capacity and adsorption rate of the titanium-based lithium ion sieve by doping with non-metallic ions nitrogen, sulfur, or selenium.

The present invention relates to the technical field of lithium-ion batteries, and discloses a lithium replenisher for lithium-ion batteries based on gasification decomposition and its application. The lithium replenisher is at least one of lithium formate, lithium acetate, lithium propionate, lithium butyrate, lithium isobutyrate, lithium oxalate, and lithium nitride. The lithium replenisher in the present invention can achieve a lithium replenishment process through the combined action of an electric field and thermal energy. The lithium replenisher is dispersed and added to the positive electrode slurry to complete lithium replenishment during the early formation process. The decomposed "by-products" are removed from the battery system in the form of gas, thus avoiding the impact of newly generated substances on the battery system from the design source, retaining the advantage of the high stability of the compound lithium replenisher; and can achieve the same lithium replenishment efficiency as metallic lithium, ensuring that the lithium-ion battery has high electrochemical performance.

The invention relates to a stable determination kit for a multi-parameter electrolyte analyzer. The stable determination kit comprises a solution A and a solution B, the solution A is prepared from the following components: 80 to 160 mmol / L of sodium chloride, 2 to 10 mmol / L of potassium chloride, 1 to 10 mmol / L of lithium acetate, 0.1 to 5 mmol / L of magnesium acetate, 0.1 to 4 mmol / L of anhydrous calcium chloride, 10 to 100 mmol / L of anhydrous sodium acetate, 50 to 100 mmol / L of buffer solution, 0.1 to 10 g / L of preservative, 0.1 to 10 g / L of stabilizer and 0.1 to 10 g / L of surfactant. The solution B is prepared from the following components: 10 to 100 mmol / L of sodium chloride, 2 to 10 mmol / L of potassium chloride, 1 to 10 mmol / L of lithium acetate, 0.1 to 5 mmol / L of magnesium acetate, 0.1 to 4 mmol / L of anhydrous calcium chloride, 10 to 100 mmol / L of anhydrous sodium acetate, 50 to 150 mmol / L of buffer solution, 0.1 to 10 g / L of preservative, 0.1 to 10 g / L of stabilizer and 0.1 to 10 g / L of surfactant. The content of K < + >, Na < + >, Cl <->, Ca < 2 + >, Li < + >, Mg < 2 + > and pH in a sample can be tested at the same time, the accuracy, repeatability and recovery rate are not affected when the sample is stored for 24 months at the temperature of 2-37 DEG C, and the raw materials are easy to obtain.

The application belongs to the technical field of electrode materials, and discloses an in-situ preparation method of a lithium iron phosphate-lithium-rich manganese-based dual-phase electrode material, which utilizes melamine, formaldehyde, ammonium polyphosphate and a mixture to prepare in-situ polymerization double-layer coated modified ammonium polyphosphate; after lithium hydroxide monohydrate is dissolved, glacial acetic acid and an aqueous solution of the in-situ polymerization double-layer coated modified ammonium polyphosphate are added and uniformly mixed to obtain a lithium acetate and ammonium polyphosphate mixed suspension; nano lithium-rich manganese-based compound powder and an organic carbon source are sequentially added to the mixed suspension of lithium acetate and ammonium polyphosphate to obtain organic carbon source coated lithium iron phosphate-lithium-rich manganese-based dual-phase precursor powder, and the powder is calcined; after inorganic carbon source and the obtained calcined product are uniformly mixed, a binder is added, and drying and pressing are performed to obtain the lithium iron phosphate-lithium-rich manganese-based dual-phase electrode material. The preparation method is simple, low in cost, high in efficiency, and the prepared lithium iron phosphate-lithium-rich manganese-based dual-phase electrode material has good water resistance.

This invention relates to the field of electrode materials technology, specifically to a method for preparing a manganese-rich precursor for cathode materials. The invention first synthesizes a manganese-nickel bimetallic organic framework using nickel acetate tetrahydrate and manganese acetate tetrahydrate as metal sources and 3,3',5,5'-biphenyltetracarboxylic acid and 2-aminoterephthalic acid as ligands. Then, through the action of a main complexing agent and a co-complexing agent, manganese acetate tetrahydrate, nickel acetate tetrahydrate, cobalt acetate tetrahydrate, and lithium acetate tetrahydrate are deposited on the surface of the manganese-nickel bimetallic organic framework to obtain the manganese-rich precursor for cathode materials. Lithium-ion batteries prepared using this manganese-rich precursor exhibit high coulombic efficiency, excellent cycle stability, and rate performance.

The invention provides a method for regenerating a lithium iron manganese phosphate positive electrode material and application of the lithium iron manganese phosphate positive electrode material. The method comprises the following steps: providing lithium manganese iron phosphate powder to be recycled; mixing the lithium manganese iron phosphate powder, tannic acid and lithium acetate, and carrying out hydrothermal reaction to obtain an intermediate for defect repair; mixing the defect-repaired intermediate, a lithium source, a manganese source, a phosphorus source, a carbon source and a doped metal oxide, and then performing post-treatment to obtain precursor microspheres; and sintering the precursor microspheres to obtain the regenerated lithium iron manganese phosphate positive electrode material. According to a synergistic regeneration mechanism of tannic acid and lithium acetate provided by the invention, accurate removal of surface impurities and in-situ repair of bulk phase lithium vacancies are synchronously realized, so that low-cost and low-energy-consumption regeneration of the waste lithium iron manganese phosphate positive electrode material is completed, and efficient repair of a microstructure is completed; finally, the regenerated lithium manganese iron phosphate positive electrode material with a stable structure and excellent electrochemical performance is obtained.

The application relates to the field of electronic materials, and particularly discloses a low-gradient zinc oxide varistor disc and a preparation method thereof; the low-gradient zinc oxide varistor disc comprises the following raw materials in parts by weight: 88-96 parts of zinc oxide, 1.5-3 parts of diantimony trioxide, 2-5 parts of bismuth trioxide, 0.2-1.8 parts of nickel oxide, 0.1-0.9 parts of cobalt trioxide, 0.1-0.4 parts of manganese oxide, 0.02-0.07 parts of chromium trioxide, 0.15-0.18 parts of lithium acetate, 1.2-1.8 parts of a dispersing agent, 1.8-2.5 parts of a binding agent, 0.12-0.15 parts of aluminum nitrate and 0.001-0.003 parts of silver nitrate; under the synergistic action of the components, the use ratio of the components is adjusted, the potential gradient of the varistor disc is reduced, the large-current resistance of the varistor disc is improved, and the change of the electrical performance after impact is reduced.