55results about How to "Stable cycle life" patented technology

The invention discloses an inorganic/organic composite functional porous isolating membrane. The isolating membrane comprises porous base material and at least one inorganic functional coating adhering to the surface of the porous base material, and aqueous slurry prepared for the inorganic functional coatings is prepared from inorganic ceramic particles, water-soluble polymer thickener and aqueous polymer adhesive; the inorganic ceramic particles comprise the same substance in two types of particle sizes, wherein the average particle size (D50) of the smaller inorganic ceramic particles is 0.2-0.5 micrometer, and the average particle size (D50) of the larger inorganic ceramic particles is 0.6-1.0 micrometer; the aqueous polymer adhesive is a hydrophobic high-molecular polymer with the water drop contact angle of the dry adhesive of the aqueous polymer adhesive 110-140 degrees; the solid content of the aqueous slurry is 40-60%. According to the inorganic/organic composite functional porous isolating membrane, the high-temperature thermal stability of the isolating membrane can be effectively improved by means of the inorganic functional coatings, and the water content of the inorganic coatings is effectively reduced, so that the safe performance of a battery and the stability of long-term circulation are improved.

The invention discloses a sodium-ion battery carbon negative electrode material. Raw materials of disordered low-graphitizing carbon materials coat or clad porous oxidized graphene or porous graphene through a hydrothermal method to obtain a carbon material precursor, the carbon material precursor is subjected to further carbonization and activation to form the sodium-ion battery carbon negative electrode material with porous graphene coated or cladded with the disordered low-graphitizing carbon materials, and the raw materials of the disordered low-graphitizing carbon materials are lignin. The invention further discloses a preparation method of the sodium-ion battery carbon negative electrode material. The obtained carbon material with the porous graphene cladded with the disordered low-graphitizing carbon has the advantages of being uniform in porosity distribution, appropriate in layer spacing, high in porosity, large in specific area, good in electrical conductivity and the like, and the composite material is used for a sodium-ion battery, and the good battery performance is shown.

The invention discloses a method for preparing lithium iron borate serving as a positive material of a lithium ion battery by a sol-gel technology. The method comprises the following steps of: dissolving a lithium source, an iron source, a borate source and a chelating agent in water according to a certain stoichiometric ratio; controlling the concentration of metal ions to be between 0.1 and 1mol/L; stirring at room temperature for 30 minutes to obtain sol; heating to 80 DEG C and keeping the temperature for 24 hours to form gel; drying the gel at the temperature of 120 DEG C and ball-milling for 2 hours; pressing into tablets under the pressure of 20MPa; sintering under the protection of argon at the temperature of between 600 and 900 DEG C for 10 hours; and naturally cooling to the room temperature to obtain the LiFeBO3. The method has the advantages of wide raw material source, simple operation process and high controllability and repeatability, the synthesis temperature of the material is effectively reduced, the preparation period of the material is shortened, and the production cost is saved. The particle size of the lithium iron borate synthesized by the method is between 60 and 600nm, and the particles have high dispersibility and crystallinity; and the lithium iron borate has higher reversible capacity and longer cycle life and can meet various requirements of the lithium ion battery during actual application.

The method consists of procedures of solid phase synthesis and burning in high temperature including following steps. (1) According to lithium: cobalt, manganese, nickel=1-1.1 : 1 (atomic ratio), and cobalt : manganese : nickel=1:1:1, polyacrylamide and neodymia are added into even mixed sources of cobalt, manganese, nickel. The above admixture is mixed round evenly till it becoming colloid. (2) Baking drys the said colloid for 30 hr. under 150 deg.C, and ball milling is carried out till powder is passed through sieve. (3) With being preburned for 10 hr. at 300-450 deg.C, the said powder is cooled to room temperature. (4) Product is obtained after fine ball milling the preburned powder, passing through sieve, burning and sifting the powder by 300 screen mesh again. Comparing with prior art, the invented method adds polyacrylamide and neodymia as well as preburning step so as to possess features of high specific capacity, good cycle performance and pollution-free.

The invention which provides a preparation method of a wide potential window negative electrode material of a lithium ion battery belongs to the technical field of lithium ion batteries. The preparation method of the invention comprises the following steps: 1, mixing a lanthanum source, TiO2 with different crystal forms, and a lithium source, and grinding for 6-12h in a ball mill to obtain a mixture; and 2, putting the mixture in a muffle furnace, reacting for 12-24h at 800-950DEG C, and naturally cooling to room temperature to obtain the wide potential window negative material Li4La5-xLaxO12of the lithium ion battery, wherein x is 0.05 or 0.1. The negative electrode material prepared in the invention has a wide potential window, a good reversible capacity, an excellent rate performance and a stable cycle life, so the material which has a high practical use value allows practical requirements of various applications of the lithium ion battery to be effectively satisfied. In addition, the method of the invention has the characteristics of simplified preparation technology, high controllable reappearance, low production cost and the like.

The invention belongs to the field of inorganic materials, and particularly relates to a preparation method of hexagonal-prism-shaped iron-cobalt double-metal selenide. The preparation method comprises the following steps: S1, mixing and dissolving iron salt and cobalt salt in isopropanol; S2, preparing a PVP isopropanol solution; S3, preparing a NaHCO3 aqueous solution; S4, mixing the solutions obtained in the step S1 and the step S2 according to a volume ratio of 1:(1-3), and carrying out ultrasonic treatment for 10-20 minutes; S5, adding the mixed solution obtained in the step S4 into the NaHCO3 aqueous solution to obtain an iron-cobalt metal precursor; and S6, mixing the iron-cobalt metal precursor obtained in the step S5 with selenium powders according to a mass ratio of 1: (1-3), andcarrying out calcining for 3-5 hours. The iron-cobalt bimetal selenium composite carbon material prepared by the preparation method provided by the invention has relatively stable cycle life and ratecapability; and the conductivity of the material can be enhanced by doping carbon, so that the specific capacity of a battery is improved.

The invention discloses a preparation method of a lithium manganese phosphate composite material; the preparation method comprises the following steps of dissolving manganese sulfate monohydrate and ferrous sulfate heptahydrate into deionized water, then adding ethylene glycol to stir to obtain a mixed solution; dropwise adding an ethylene glycol phosphate solution into a lithium hydroxide ethylene glycol solution for stirring, then dropwise adding the mixed solution, stirring, and carrying out hydrothermal reaction, and drying to obtain a LiMn0.5Fe0.5PO4 precursor; sequentially dissolving lithium hydroxide, tetrabutyl titanate and lanthanum nitrate into absolute ethyl alcohol for stirring, then adding deionized water, and then adding the LiMn0.5Fe0.5PO4 precursor for stirring, carrying out hydrothermal reaction and drying to obtain a Li0.3La0.56TiO3-LiMn0.5Fe0.5PO4 precursor; and enabling the Li0.3La0.56TiO3-LiMn0.5Fe0.5PO4 precursor to be mixed with glucose, and performing ball milling, calcining, cooling and sieving to obtain the lithium manganese phosphate composite material. The lithium manganese iron phosphate composite material is relatively small in particle size, uniform in particle size distribution, and high in degree of crystallinity, so that the electrochemical performance of the material is improved while the material preparation cost is lowered.

The invention relates to a functionalized ionic liquid/S-C composite material and a preparation method and a composite cathode material thereof, and belongs to the technical field of flow battery. Thefunctionalized ionic liquid comprises an ionic liquid and SiO2. The ionic liquid is 1-methyl-1-propyl(trimethoxy silane)piperidine onium chloride. In the invention, the ionic liquid (SiO2-PPCl) functionalized sulfur supernatant solution flow electrode is used as the cathode of a lithium-sulfur flow battery. During charge-discharge process, an active substance polysulfide can react with a functional group in SiO2-PPCl to form a bond so as to inhibit migration of polysulfide to lithium anode. During charge-discharge process, the ionic liquid is also helpful for helpful for reducing electrochemical polarization and promoting conversion between active substances.

The invention discloses a preparation method of a silicate positive electrode material for a lithium ion battery, which comprises the following steps of: dissolving manganous sulfate and ferrous sulfate into distilled water, after the manganous sulfate and the ferrous sulfate are completely dissolved, stirring while dripping 3-5mol/L of sodium hydroxide solution until the pH value is 11-13 so as to ensure that manganese ions and iron ions are completely precipitated; then filtering the precipitates and cleaning the precipitates with the distilled water; mixing the precipitates with silicon dioxide, lithium hydroxide and lithium nitrate; and carrying out one-step sintering on the mixed materials for 8-12h in the presence of inert gas shielding at 550-600DEG C to obtain Li2Mn1-xFexSiO4 powder as the silicate positive electrode material. The invention has the advantages that one-step sintering is only needed, is the method is simpler and more convenient compared with the traditional process with multiple sintering; meanwhile, because a high-temperature sintering process is avoided in the method, the positive electrode materials prepared are uniform with good dispersity, thereby ensuring that the prepared positive electrode material has favorable electrochemical property.

The invention discloses a preparation method of a spherical porous lithium-ion battery high-voltage cathode material and belongs to the technical field of lithium-ion batteries. The chemical formula of the material is LiNi0.5Mn1.5O4-Li3xLa(2/3)-xTiO3, wherein 0.05<x<0.15, and the mass fraction of the Li3xLa(2/3)-xTiO3 is 5%. The material is prepared by adopting an organic solvent assisted coprecipitation method. The preparation method is wide in raw material source, simple and convenient to operate, good in controllability and high in reproducibility, and the long-time high-energy-consumption high-temperature sintering process is avoided. The prepared material has the porous spherical characteristics, is small in granule, uniform in particle size distribution, high in crystallinity and better in rate performance, is of a P4332 structure and can be used as the high-performance lithium-ion battery high-voltage cathode material.

The invention discloses a preparation method of a titanate composite negative electrode material for a lithium ion battery. The preparation method comprises the following steps of dissolving a titanium source and a chromium source in an ethanol aqueous solution, adding citric acid under a stirring condition, adding the ethanol aqueous solution comprising a lithium source, performing water bath heating to form a gel state, performing drying and grinding, placing the product in a muffle furnace for pre-burning, and cooling to a room temperature to obtain a LiCrTiO<4-a<Cr2O3 precursor; dissolvingthe LiCrTiO<4-a<Cr2O3 precursor and FePO4 in absolute ethyl alcohol, performing uniform stirring and drying, cooling to the room temperature, placing the product in a ball-milling machine for ball-milling, performing sieving, placing the product in the muffle furnace for calcination, and cooling to the room temperature to obtain a LiCrTiO<4-a>Cr2O3-FePO4 electrode material; and dispersing the electrode material in an acetone solution, adding CNT, performing stirring, allowing a liquid to be completely volatilized to obtain the titanate composite negative electrode material for the lithium ionbattery. The preparation method has the advantages of wide raw materials, good controllability and high reproducibility and is simple and convenient to operate, the obtained material is relatively small in particle, uniform in grain size distribution and high in crystallinity, so that the material preparation cost is reduced, and the electrochemical performance of the material is improved.

A grinding preparation method and application of a polyoxometallate-metal organic framework (POMOF) material relate to the technical field of electrode materials and aim to solve the problem that a conventional POMOF used as the electrode active matter of a supercapacitor is low in production yield, unstable in repeated synthesis, small in active area, and low in electrical conductivity. The method comprises adding AgNO3 and (NH4)6Mo7O24.4H2O to distilled water; stirring the mixture to dissolve the added objects; adjusting a pH value to 3.5 to 4.5; evaporating the mixture; mixing and grindingthe mixture with trimesic acid, silver nitrate andabsolute ethyl alcohol; and finally cleaning and drying a product to obtain a {Ag6Mo7O24}@Ag-BTC material. The {Ag6Mo7O24}@Ag-BTC material is used asthe electrode material of the supercapacitor. The invention can obtain a grinding preparation method and application of a POMOF material.

The invention provides a preparation method of a lithium titanate negative electrode material of a lithium ion battery. The invention belongs to the technical field of lithium-ion batteries. The method comprises the following steps: preparing porous Li4Ti5O12 nanosheets by utilizing LiOH.H2O, Ti (OC4H9) 4 and the like; then preparing nitrogen-doped carbon nanosheets by utilizing medium-temperaturecoal pitch and the like; then, grinding and transferring the porous Li4Ti5O12 nanosheets, the nitrogen-doped carbon nanosheets and a sulfur-containing substance into a tubular furnace; and carrying out continuous heat treatment in a mixed gas at 500-600 DEG C for 3 hours, and naturally cooling to room temperature to obtain a coal pitch-based sulfur and nitrogen-doped carbon nanosheet modified sulfur-doped lithium titanate negative electrode material with a hierarchical structure. The negative electrode material prepared by the invention is in a nanosheet shape, is stable and compact in structure, maintains the stability and high conductivity of an electrode structure, and has excellent high-rate performance and cycling stability.

The invention discloses a method for preparing a chromium-titanium-based lithium ion battery composite material, comprising the following steps of: S1, dissolving a titanium source and a chromium source in an aqueous solution of absolute ethanol, adding an aqueous solution of ethanol containing a lithium source, stirring the mixed solution, and then adding an aqueous solution containing nickel nitrate and sodium molybdate, stirring the mixed solution to react at 140 to 180 degrees centigrade for 24 to 26 hours, and cooling and filtering a reaction product to obtain a precursor; S2, drying, calcining, cooling, ball milling, sieving, sintering and cooling the precursor to obtain a LiCrTiO4-aNiMoO4 material; S3, dissolving the LiCrTiO4-aNiMoO4 material in deionized water, dispersing ultrasonically the material, adding a surfactant, stirring the mixture, then adding pyrrole monomer, hydrochloric acid and an ammonium persulfate aqueous solution, stirring, filtering and drying the mixture toobtain the chrome-titanium-based lithium ion battery composite material.

The invention discloses an acid-adding charging method for prolonging the cycle life of a power valve-regulated lead-acid storage battery. The method comprises the following steps: 1, putting the valve-regulated lead-acid storage battery provided with a green plate into a vacuum acid-adding machine, and adding a low-acid-density electrolyte of which the acid amount is 50-67% of the acid amount required by the battery into the battery through the vacuum acid adding machine, and then vacuumizing to make the vacuum degree reach -0.085 MPa; 2, electrically connecting the two ends of the unformed plate of the battery with a power supply, charging for 10-20 hours, and then pausing charging; and 3, adding the high-acid-density electrolyte with the residual acid amount required by the battery into the battery on line through the vacuum acid adding machine. The technical problem that the service life of the battery produced by the battery formation process is short is solved, and the cycle life of the power valve-regulated lead-acid storage battery is prolonged.