69 results about "Lithium molybdate" patented technology

The invention discloses a positive electrode material lithium-enriched doped lithium molybdate of a lithium ion battery and a preparation method thereof. The chemical structural formula is Li2M1-xMoxO3; the lithium-enriched doped lithium molybdate has favorable electrochemical charge and discharge actions; the discharge capacity is 156mAh/g (the theoretical capacity is 85% of 169.8mAh/g) under the low-current charge and discharge condition (0.1C); the preparation method is simple and feasible, has low cost, has high specific capacity and excellent cycle reversible performance, and has obvious practical value and economic benefit.

The invention discloses lithium molybdate serving as a secondary battery electrode material. In an execution mode, a chemical formula of the electrode material is Li (2-x)MoyMzO(3-u), wherein x is larger than or equal to minus 2 and smaller than or equal to 2, y is larger than 0 and smaller than or equal to 5, z is larger than or equal to 0 and smaller than or equal to 9, u is larger than or equal to minus 9 and smaller than or equal to 3, and M comprises one element selected from C, N, F, Na, Mg, Al, Si, P, S, Cl, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Rb, Sr, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Cd, In, Sn, Sb, Te, I, Cs, Ba, Ta, W, Re, Os, Ir, Pt, Au, Hg, Pb, Bi, Po, At, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu or combination of the elements. The electrode material is characterized by having very high specific capacity, excellent cycle performance, rate capability and safety.

The invention relates to a low-temperature electrolyte for LiFePO4 (lithium iron phosphate) lithium-ion batteries, belonging to the technical field of low-temperature electrolytes for lithium batteries. The electrolyte comprises dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, ethylene carbonate, a film-forming additive and lithium polyoxometallate, wherein the lithium polyoxometallate refers to lithium phosphomolybdate Li3PMo12O40, lithium phosphotungstate Li3PW12O40, lithium silicotungstate Li4SiW12O40 or lithium silicomolybdenate Li4SiMo12O40. For solving the problems that in the prior art, the lithium ion transport of an electrolyte is blocked, slow in speed and low in efficiency and the electrolyte is poor in low-temperature performance, the invention provides a novel fluoride-free low-temperature electrolyte for LiFePO4 lithium-ion batteries; and by taking the non-fluoride lithium polyoxometallate with a three-dimensional skeleton structure as an electrolytic lithium salt and selectively adopting a low-viscosity carbonate solvent, through optimized proportioning, the migration rate of lithium ions is increased, and the low temperature properties of LiFePO4 batteries can be significantly improved.

The invention relates to a lithium molybdate cathode material for lithium ion battery and a preparation method thereof. The method includes: evenly mixing lithium salt and a molybdenum salt precursor according to stoichiometric ratio (molar ratio), heating to 200-400 DEG C in the air, carrying out heat preservation and pretreatment, and then conducting a sintering reaction in air or nitrogen, argon and carbon dioxide inert atmosphere at 500-800 DEG C, so as to obtain the lithium molybdate (Li2MoO4) cathode material for lithium ion battery. The method also includes adding a carbon material in the preparation process to carry out carbon coating on the product, wherein the carbon material is carbohydrate, acetylene black or graphite. The carbon material can be added in the mixture of precursor, or in the sintering reaction, or after the sintering reaction after sintering and sintered again. The method has simple process, and the obtained material has high actual capacity and excellent cycling performance.

The invention discloses a lithium molybdate surface modified lithium ion battery nickel-rich positive pole material and a preparation method thereof. The chemical formula of the lithium ion battery nickel-rich material is LiNiaCobM1-a-bO2, wherein a and b are the mole number, a is larger than or equal to 0.5 and is smaller than or equal to 1, b is larger than or equal to 0 and is smaller than or equal to 0.2, M is one or more of Mn, Al and Fe, Li2MoOx is surface modified layer material lithium molybdate, and x is larger than or equal to 3 and is smaller than or equal to 4. The lithium molybdate surface modified lithium ion battery nickel-rich positive pole material is prepared through simple liquid phase precursor preparation, surface modification and high-temperature solid phase sintering reaction. The lithium molybdate surface modification layer has the good lithium ionic conductivity, and is beneficial to lithium ion de-intercalation. By means of the lithium molybdate surface modified lithium ion battery nickel-rich positive pole material, the rate capability, cycle performance and safety of the nickel-rich positive pole material can be greatly improved; according to the preparation method, raw materials are easy to obtain, operation is easy, the cost is low, and industrial large-scale production is easy to achieve.

The invention provides a lithium molybdate positive electrode material of a high temperature lithium battery. A chemical structural formula is Li2MoO4. The invention also provides a preparation methodof a high temperature solid phase of the material, which comprises the following steps: weighing lithium salt and a molybdenum source according to a mol ratio, performing ball milling for 2-5 h and taking the material out, grinding the material and sieving the material, and sintering the material for 10-16 h under the air atmosphere at the temperature of 200-800 DEG C, and cooling the material toroom temperature. The invention also provides a preparation method of synthesis of its aqueous solution, and the difference is characterized in that the lithium salt and the molybdenum source are dumped in water for stirring and drying. In addition, the invention provides a preparation method of the positive electrode material of the high-temperature lithium battery, which comprises the followingsteps: grinding the above lithium molybdate positive electrode material of the high-temperature lithium battery and sieving the material; weighing the material, low melting point nitrate and an active carbon material, performing ball milling for 2-5 h, sintering the material under air atmosphere for 180 DEG C, taking the material out and grinding the material, and sieving the material. The lithium molybdate positive electrode material employs lithium molybdate, and has the advantages of high temperature resistance, good compatibility with nitric acid molten salt, high capacitance, and good discharge performance.

Provided are a positive active material, a lithium battery including the positive active material, and a method of manufacturing the positive active material. The positive active material includes a lithium molybdate composite having a core-shell structure. The lithium molybdate composite acts as a sacrificial positive electrode in a positive electrode of a battery. The positive active material is able to increase charge capacity of a lithium battery, and accordingly is able to improve lifetime properties of a lithium battery.

Disclosed is neodymium-doped gadolinium lithium molybdate laser crystal, its preparation process and use thereof, wherein the crystal is prepared through a Czochralski method conducted at 1035 deg C at a crystal rotational speed of 20-55 rpm, the obtained high quality large scale Nd3+:LiGd(MoO4)2 crystal can be applied into the fields of optical spectroscopy, biological medicine and military purpose.

The invention provides zinc oxide voltage-sensitive ceramic and a preparation method thereof, as well as a zinc oxide voltage-sensitive resistor and a preparation method thereof. The matrix ingredients comprise zinc oxide, bismuth trioxide and cobaltic oxide. By adding cosolvents vanadic oxide and calcium fluoride, as well as a vitrification agent nitrate barium, the sintering temperature of the ceramic is reduced, the grain growth in the sintering process is effectively promoted, and the voltage-sensitive voltage threshold is reduced; by adding interface optimization agents sodium tungstate dihydrate and lithium molybdate, the grain boundary component and structure are optimized, the voltage-sensitive coefficient and performance of the material are improved, the nonlinear coefficient is improved, and the leakage current density is reduced.

The invention discloses a lithium molybdate nano-rod electronic packaging material, and belongs to the technical field of electronic packaging materials. The lithium molybdate nano-rod electronic packaging material comprises, by mass, 65-80% of lithium molybdate nano-rods, 8-12% of polyvinyl alcohol, 0.05-0.5% of sodium fatty alcohol polyoxyethylene ether carboxylate, 4-8% of aluminum isopropoxide, 4-8% of microcrystalline paraffin and 3-7% of water, the diameter of the lithium molybdate nano-rods is 50-100nm, and the length of the lithium molybdate nano-rods is 1-3[mu]m. The lithium molybdate nano-rod electronic packaging material has the characteristics of good insulation property, excellent ageing and corrosion resistance, high heat conduction coefficient, small heat expansion coefficient, good workability, simple preparation process and low preparation temperature, and has good application prospect in the field of electronic packaging materials.

The invention provides a vanadium battery electrolyte containing inorganic molybdate. The vanadium battery electrolyte contains vanadium ion, sulfuric acid and an inorganic molybdate additive, wherein the concentration of the inorganic molybdate additive is 0.01M-0.25M and the inorganic molybdate is selected from one or more than two of sodium molybdate, ammonium molybdate, potassium molybdate, lithium molybdate, magnesium molybdate, zinc molybdate and calcium molybdate. The vanadium battery electrolyte containing inorganic molybdate can be taken as a cathode electrolyte of the vanadium battery. According to the invention, the inorganic molybdate is taken as the cathode electrolyte additive, so that the stability of the cathode electrolyte is increased and the running temperature scope of the vanadium battery is widened. The vanadium battery electrolyte containing inorganic molybdate has the advantages that the preparation technique is simple in operation, the cost is low and the high-temperature stable running of the vanadium battery can be easily realized.

The invention relates to a neodymium-doped lanthanum barium lithium molybdate laser crystal and a preparation method and application thereof. The high-quality Nd<3+>:Li3Ba2La3(MoO4)8 crystal with large size is grown by using 60-80at% Li2MoO4 as a fluxing agent under the conditions that the cooling rate is 0.5-2 DEG C/day and the rotating speed is 5-30r/min. The crystal belongs to the monoclinic system and has C2/c space group structure. The crystal is a novel laser crystal and can generate and output lasers with wavelength being about 1.06mu m. The solid lasers prepared by the crystal can be applied to such fields as spectroscopy, biomedicine, military affairs and the like.

The invention discloses a preparation method for improving a quality factor of a lithium molybdate microwave dielectric ceramic. The preparation method comprises the following steps of first weighing raw materials (NH4)6Mo7O24.4H2O and LiOH.H2O according to a molar ratio of 1:14 for feed proportioning, and adding deionized water into an obtained mixture, so as to obtain a clear solution; afterwards, transferring the solution into a mortar, and heating the solution to 60 DEG C at a constant temperature, thereby completely evaporating moister, so as to obtain white powder; subsequently, using anhydrous alcohol as a dispersing agent, and grinding and drying the white powder to obtain a powder lot which is uniform in particles; after that, granulating the powder lot, and then carrying out compression molding on the granulated powder lot to become a green compact; first carrying out heat preservation on the green compact for 1 hour at 120 DEG C, and then sintering the green compact at 530 DEG C to 550 DEG C, so as to prepare the lithium molybdate microwave dielectric ceramic. According to the preparation method, in comparison with a conventional solid phase method, water is used as a reaction environment; the raw materials can react with one another sufficiently; high-purity lithium molybdate powder is obtained; presintering and ball milling processes are excluded; an impure phase is prevented from being introduced due to an insufficient reaction in the presintering process and the ball milling; therefore, the quality factor is improved; the microwave dielectric property of the ceramic is effectively improved; the preparation method has a better application prospect.

The invention relates to dimmable rare earth doped lanthanum lithium molybdate fluorescent powder and a preparation method thereof. Li2CO3 powder, La2O3 powder, MoO3 powder, Dy2O3 powder and Eu2O3 powder are weighed in the mole rate being 1:(1-x):4:0.05:x, ground and stirred uniformly, and a reactant material is obtained, wherein x ranges from 0.01 to 0.17; the reactant material is calcined at 750-850 DEG C for 4-6 hours, and a reaction product is obtained; after the reaction product is cooled, the reaction product is taken out, ground and sieved, and the dimmable rare earth doped lanthanum lithium molybdate fluorescent powder is obtained. The fluorescent powder adopting a pure-phase substance structure is formed with a high-temperature solid phase method, raw materials are more widely sourced, the cost is lower, and no toxic organic matter is produced; under excitation of fixed wavelength, the developing range of the fluorescent powder can change in red and yellow light areas in a color coordinate graph by changing the doping concentration of Eu<3+> and using the energy transfer function between Dy<3+> and Eu<3+>, and the dimmable performance of the fluorescent powder is realized.

The invention relates to an erbium-doped yttrium barium lithium molybdate laser crystal and a preparation method and application thereof. The high-quality Er<3+>:Li3Ba2Y3(MoO4)8 crystal with large size is grown by using 60-80at% Li2MoO4 as a fluxing agent under the conditions that the cooling rate is 0.5-2 DEG C/day and the rotating speed is 5-30r/min. The crystal belongs to the monoclinic systemand has C2/c space group structure. The crystal is a novel laser crystal and can generate and output lasers with wavelength being about 1500nm.

The invention provides a preparation method of a high-temperature lithium battery positive electrode material. The preparation method comprises the following steps: preparing lithium molybdate; grinding and sieving the lithium molybdate; weighing 70-90 parts by mass of ground and sieved lithium molybdate, 5-20 parts by mass of eutectic salt with the melting point lower than 300 DEG C and 5-10 parts by mass of activated carbon, grounding and evenly mixing, and obtaining a mixture A; and sintering the mixture A in a vacuum atmosphere to obtain a high-temperature lithium battery positive electrode material. The invention also provides a high-temperature lithium battery positive electrode material and a high-temperature lithium battery. The high-temperature lithium battery positive electrode material and the preparation method thereof provided by the invention can be applied to the field of high-temperature batteries, and the high-temperature lithium battery prepared from the high-temperature lithium battery positive electrode material has excellent discharge capacity performance.

The invention belongs to the technical field of air conditioning refrigeration and particularly relates to a special lithium bromide solution for an adsorption refrigerator and a preparation method thereof. The special lithium bromide solution for the adsorption refrigerator comprises a corrosion inhibitor which accounts for 1 to 3.5 percent of the total mass of the lithium bromide solution. The corrosion inhibitor comprises the following raw material components in parts by mass: 15 to 35 parts of lithium molybdate, 10 to 50 parts of lithium tungstate, 1 to 5 parts of lithium dihydrogen phosphate, 4 to 15 parts of hydrobromic acid, 0.5 to 2 parts of zinc dihydrogen phosphate and 0.5 to 2 parts of manganous nitrate. The special lithium bromide solution for the adsorption refrigerator is excellent in combination of a passive film layer and an inner cavity material, has more excellent corrosion resistance and good temperature resistance and stability.

The invention relates to a lithium molybdate coated lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The structure of the lithium molybdate coated lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based layered oxide inner core and a Li2MoO4 coating layer, and a Mo6+ concentration gradient transition layer exists between the lithium-rich manganese-based layered oxide inner core and the Li2MoO4 coating layer; in the transition layer, the concentration of Mo6+ is gradually reduced from one side of the coating layer to one side of the inner core, and the thickness of the transition layer is 0.1-10 nm; the chemical expression of the Li2MoO4 coated lithium-rich manganese-based layered oxide positive electrode material is xLi[Li0.33Mn0.67]O2.(1-x)LiMO2@Li2MoO4, 0<x<1, wherein M at least comprises two elements of Mn, Ni, Co, Al and Mg.