23 results about "Lithium molybdate" patented technology

The invention discloses a high-initial-efficiency fast-charge graphite composite material and a preparation method thereof, the composite material is of a core-shell structure, the core is graphite, and the shell is lithium sulfonate / lithium molybdate and an amorphous carbon coating layer thereof; the mass ratio of the shell is 5-15 wt% according to the mass ratio of the composite material being 100%. The preparation method comprises the following steps: adding a molybdenum compound into a solvent to prepare a solution, adding graphite oxide, an inorganic lithium salt and a carbon nanotube conductive solution, reacting for 2-12 hours at the temperature of 50-120 DEG C, filtering, carbonizing filter residues to obtain a lithium molybdate conductive agent coated graphite material, and depositing a lithium sulfonate derivative on the surface of the lithium molybdate conductive agent coated graphite material by an atomization method to obtain the lithium molybdate conductive agent coated graphite material. The electron and ion conductivity of the material can be improved, and the rate and the first efficiency of the material can be improved.

The application relates to the technical field of battery diaphragm, and discloses a lithium ion battery diaphragm with high viscosity and high safety, which is prepared from the following components in parts by weight: 15-20 parts of polyolefin, 80-85 parts of pore-forming agent and 2-4 parts of filler; the viscosity average molecular weight of the polyolefin is 1-4 million; the raw material of the filler comprises component A and component B in a mass ratio of 1:19-19:1; the component A comprises barium stearate; and the component B comprises one or more of lithium molybdate, lithium tungstate and lithium tantalate. Through the technical scheme, the problem of low strength of the lithium battery diaphragm in the related art is solved.

The present application relates to a positive electrode material and a preparation method thereof, and a lithium ion battery. The positive electrode material includes secondary particles, which are formed by agglomeration of a plurality of primary particles. The secondary particles include: a matrix material, whose general chemical formula is Li a Ni x Co y M z N b O 2 , wherein 0.95≤a≤1.1, 0.6≤x<1, 0<y<0.4, 0<z<0.4, 0≤b<0.4, x+y+z+b=1, M is Mn and / or Al, N includes at least one of Zr, Mg, Sr, V, Y, Nb, B, S, Ba, Ti and Ta; and a first coating located on the surface of the base material, the first coating includes lithium tungstate and / or lithium molybdate; the positive electrode material also includes a second coating located on the surface of the secondary particles, the second coating is located between and / or on the surface of the primary particles on the surface of the secondary particles; the second coating includes Al 2 O 3 、TiO 2 、MgO、CeO 2 、ZrO 2 and at least one of the corresponding lithium-containing metal compounds. The positive electrode material of the present application can reduce the overpotential in the battery electrode and improve its cycle performance and rate performance.

The invention belongs to the field of metallurgical electrode materials, and particularly relates to a nickel-manganese-doped binary method for a lithium battery positive electrode material. Comprising the following steps: (1) mixing lithium molybdate with a precursor and a lithium source, and adding water in the mixing process to obtain a water-containing wet material with the water mass fraction of 1-5%; and (2) carrying out subsequent high-temperature sintering on the water-containing wet material, cooling, crushing and sieving to obtain the molybdenum-doped positive electrode material. The prepared positive electrode material can realize uniform doping of the molybdenum element, and the material after high-temperature synthesis is not agglomerated and is easy to crush, so that subsequent treatment is facilitated.

The invention provides a high-temperature-resistant far infrared radiation ceramic coating, a ceramic coating and a preparation method, and relates to the technical field of surface engineering. The high-temperature-resistant far infrared radiation ceramic coating disclosed by the invention is prepared from the following raw materials in parts by weight: 12 to 22 parts of lutetium pyrotantalate; 10 to 16 parts of hafnium boride; 8-14 parts of nitrogen aluminum titanium; 9 to 15 parts of gadolinium zirconate; 4 to 7 parts of molybdenum disilicide; 2 to 5 parts of samarium hexaboride; 6 to 11 parts of pyrochlore type zirconium tungstate; 1 to 2.5 parts of a sintering aid; 0.5 to 1.5 parts of carbon nano onion; 3 to 6 parts of bismuth vanadate; 5 to 9 parts of phosphotungstic acid; and 1-3 parts of lithium molybdate. According to the high-temperature-resistant far infrared radiation ceramic coating disclosed by the invention, various rare earth compounds and refractory metal compounds are introduced to form a unique multi-phase composite system, and all the components generate a synergistic effect in an optimized interval, so that the thermal stability, thermal shock resistance and mechanical strength of the coating are remarkably improved; and finally, long-acting protection under extreme working conditions of high temperature, corrosion and abrasion of the water cooling wall of the boiler is realized.

The application discloses a kind of porous graphite, preparation method and application of silicon-carbon composite material, belong to battery material technical field.The preparation method is: metal, petroleum coke and its dopant are mixed uniformly, pre-carbonization, graphitization, obtain graphite material, then it is etched to pore by plasma technology, then activation, obtain porous graphite;Finally by silane cleavage method, pass in silane mixed gas and carry out nanometer silicon deposition, passivation, then the obtained material is added to the solution of lithium molybdate and lithium sulfonate and coated, spray drying, obtain double lithium compound coated silicon-carbon composite material.The obtained material utilizes the characteristics that porous graphite itself electronic conductivity is high, and the outer layer coated double lithium salt structure improves ionic conductivity and its first efficiency, and plays the synergistic effect between the two, reduces expansion, improves cycle performance.

The invention discloses a molybdenum-doped and lithium molybdate-coated single-crystal ultrahigh-nickel binary lithium ion battery positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a nickel-cobalt binary precursor with a lithium salt, carrying out high-temperature calcination to obtain a lithium-deficient single-crystal ultrahigh-nickel binary positive electrode material, mixing the lithium-deficient single-crystal ultrahigh-nickel binary positive electrode material with an aqueous solution of ammonium molybdate, drying, adding a small amount of lithium salt, and carrying out secondary high-temperature calcination to obtain the lithium-deficient single- and finally, the molybdenum-doped and lithium molybdate-coated single-crystal ultrahigh-nickel binary lithium ion battery positive electrode material is obtained. According to the preparation method disclosed by the invention, a lithium molybdate surface coating layer and a Mo-O bond with high bond energy are introduced and cooperate with each other to stabilize a lattice structure and inhibit lattice oxygen evolution and harmful phase change of the material in a circulating process while an excellent single crystal particle morphology is maintained, so that the comprehensive electrochemical performance of the material is improved, and the preparation method has a good application prospect.

The invention discloses a high-capacity alloy negative electrode material for a lithium ion battery and a preparation method of the high-capacity alloy negative electrode material, the material is of a core-shell structure, the core is tin-doped porous carbon, and the shell is amorphous carbon. The inner core is composed of a tin simple substance, amorphous carbon and a porous lithium molybdate compound. The preparation method comprises the following steps: preparing a porous lithium molybdate compound, respectively carrying out carbon deposition and organostannane compound deposition through vapor deposition, and then carrying out unsaturated hydrocarbon passivation at low temperature. The expansion of the silicon-based material can be reduced, and the first efficiency and the power performance of the material can be improved.

The invention discloses a lithium molybdenum chromate single crystal, a preparation method thereof and an optical filter, and belongs to the technical field of optical materials. The general chemical formula of the lithium molybdenum chromate single crystal is Li2CrxMo1-xO4, x is larger than or equal to 0.005 and smaller than or equal to 0.5, the lithium molybdenum chromate single crystal is a trigonal system, the space group is R, the lithium molybdenum chromate single crystal is in cut-off absorption at the wavelength of 500 nm or below, the lithium molybdenum chromate single crystal has high transmittance from 500 nm or above to the infrared band, the room-temperature heat conductivity is 4 W * m <-1 > * K <-1 >, and the lithium molybdenum chromate single crystal is suitable for manufacturing 500 nm long-wave-pass optical filters high in stability and reliability. According to the invention, a proper amount of hexavalent chromium (Cr < 6 + >) is introduced into a lithium molybdate matrix, and an absorption edge can be moved and a required long-wave-pass characteristic can be formed by regulating and controlling the content of hexavalent chromium; meanwhile, the oxide crystal is more suitable for high-power transmission and optical application in a harsh environment due to high thermal conductivity and mechanical stability, and the problem that an existing thin film and a polymer optical filter are insufficient in thermal stability and high-power bearing is solved.

The present invention relates to the technical field of lithium ion battery materials, and in particular to a lithium silicomolybdate material and a preparation method and application thereof. The structure of the lithium silicomolybdate material of the present invention is Li 4‑2x Si 1‑x Mo x O4, where 0

The invention relates to cerium-lanthanum co-doped coated modified lithium manganese iron phosphate, a preparation method and a positive electrode. The preparation method comprises the following steps: preparing a cerium-lanthanum co-doped lithium manganese iron phosphate precursor by a solid phase method; coating a lithium molybdate layer on the surface of the cerium-lanthanum co-doped lithium manganese iron phosphate precursor through atomic layer deposition; and coating the surface of the lithium molybdate layer with a polymethyl methacrylate coating layer by spraying an emulsion polymer to obtain the cerium-lanthanum co-doped coated modified lithium manganese iron phosphate. Through co-doping of cerium and lanthanum and synergistic modification of a lithium molybdate layer and a PMA coating layer, the bulk phase stability is improved, Jahn-Teller distortion of trivalent manganese ions and oxidation dissolution of ferrous ions are inhibited, the ionic conductivity is improved, HF corrosion is resisted, electrolyte decomposition and overgrowth of an SEI film are inhibited, and volume change is adapted to prevent particle breakage; the three synergistically reduce the interface impedance, and synchronously improve the material cycle life, the high rate performance and the interface compatibility.

A preparation method of a chelated lithium molybdate lubricant additive includes: adding kaolin and HDTMS into deionized water, performing magnetic stirring and ultrasonic treatment, then stirring to perform a reaction, and after the reaction is finished, filtering, washing and drying a reaction product to obtain alkylated kaolin; adding the alkylated kaolin and APTMS into deionized water, performing magnetic stirring and ultrasonic treatment, then stirring to perform a reaction, and after the reaction is finished, centrifuging, washing and drying a reaction product to obtain amino / alkylated kaolin; adding the amino / alkylated kaolin into a chelated lithium molybdate ionic liquid, stirring for a reaction, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the chelated lithium molybdate lubricant additive. The prepared lubricant additive has good dispersibility in base oil, and performs well in friction reduction and anti-wear.

The invention discloses a preparation method of a lithium molybdate cesium crystal. The chemical formula of the cesium lithium molybdate crystal is CsLiMoO4, the cesium lithium molybdate crystal is in a cubic system and # imgabs0 # point group at room temperature, and the cell parameter of the cesium lithium molybdate crystal is as follows: # imgabs1 # alpha = beta = gamma = 90 degrees. The cesium lithium molybdate crystal can be used for manufacturing important electro-optical devices such as electro-optical modulators, electro-optical switches, electric control light beam deflectors, phase delayers and electro-optical compensators. According to the method for preparing the lithium cesium molybdate through the fluxing agent method, the crystal growth temperature is effectively reduced, the grown crystals are good in quality, few in crystal defect and good in component uniformity, and preparation of large-size and high-quality single crystals can be achieved. In addition, fluxing agent method crystal growth equipment is simple, and industrial popularization is facilitated.

The invention relates to the technical field of lithium battery positive electrode materials, and particularly discloses a spinel type lithium nickel manganese oxide positive electrode material and a preparation method and application thereof.The preparation method comprises the following steps that a lithium source and a nickel manganese hydroxide precursor are evenly mixed, pre-calcined at the temperature of 650-850 DEG C and then calcined at the temperature of 850-1050 DEG C, and the spinel type lithium nickel manganese oxide positive electrode material is obtained; cooling, crushing, sieving, uniformly mixing with a lithium-containing additive I, calcining at 750-950 DEG C, cooling, crushing, sieving, uniformly mixing with a lithium-containing additive II, nano molybdenum oxide and nano lanthanum oxide, calcining at 300-650 DEG C, cooling, crushing, and sieving; according to the invention, the initial lithium ratio of the material is reduced, the inner core is formed through first sintering, then the transition layer coated with high-temperature lithium is formed through subsequent second sintering, and the layered lanthanum lithium molybdate outermost layer is formed through third sintering; and finally, the spinel type lithium nickel manganese oxide positive electrode material with high capacity and good cycle performance and rate capability at high working voltage is obtained.

The present invention relates to a preparation method for in-situ forming a lithium molybdate coating on a diaphragm. The method comprises mixing a MoO3 nanorod material with Super P and PVDF, applying the mixture by doctor blade coating on a common diaphragm, shaping the mixture at room temperature, drying the mixture for standby use, and then assembling the mixture with a lithium metal negative electrode into a CR2032 button battery at room temperature. The battery is then installed on a LAND CT2001A terser battery testing system, and the in-situ lithium molybdate diaphragm coating is formed after 100 charge and discharge cycles. The lithium molybdate diaphragm coating prepared by this method can not only fundamentally improve the low active material utilization and polysulfide shuttle effect that occur in the actual use of Li-S batteries, but also facilitate large-scale production and commercial promotion due to its simple synthesis method.

The invention relates to the technical field of battery materials, and discloses a low-residual-alkali high-nickel positive electrode material, a preparation method thereof, a positive electrode and a battery. The preparation method of the low-residual-alkali high-nickel positive electrode material comprises the following steps: mixing and stirring a common high-nickel ternary positive electrode material and an ammonium phosphomolybdate suspension to obtain a solid-liquid mixture, and then extracting solids in the solid-liquid mixture; and sintering the obtained solid under an aerobic condition to obtain the low-residual alkali and high-nickel positive electrode material. The chemical formula of the common high-nickel ternary positive electrode material is LiNi < x > Co < y > Mn < 1-x-y > O < 2 >, x is greater than or equal to 0.8, and y is greater than 0 and less than or equal to 0.2; the chemical formula of the ammonium phosphomolybdate is (NH4) 3 [PMo12O40. 6H2O]; according to the preparation method, the amount of residual alkali on the surface of the high-nickel positive electrode material can be reduced, and coating of fast ion conductor lithium molybdate (Li2MoO4) on the surface of the positive electrode material is realized.

In an aspect, a Co2Z-type ferrite comprises oxides of at least Me, Co, Mo, Li, and Fe; wherein Me is at least one of Ba or Sr. In another aspect, the Co2Z-type ferrite comprises a Z-type hexaferrite an amount of lithium molybdate. In another aspect, the Co2Z-type ferrite has a formula Li2MoO4·BaxSr3-xCo2+y−zMe′yMe″zFe24-2y-mO41, wherein Me′ is at least one of Ti, Mo, Ru, Ir, Zr, or Sn; Me″ is at least one of Zn, Mn, or Mg; x is 0 to 3; y is 0 to 1.8; z is 0 to 1.8; and m is −4 to 4. In yet another aspect, a method of making a Co2Z-type ferrite comprises milling an initial Co2Z-type ferrite and Li2MoO4 to form a mixed ferrite; and calcining the mixed ferrite to form the Co2Z-type ferrite.

The application discloses a lithium molybdate-chromate monocrystal, a preparation method thereof and an optical filter, and belongs to the technical field of optical materials. x Mo 1‑x O4, wherein 0.005<=x<=0.5, the lithium molybdate-chromate monocrystal is of a trigonal system, a space group is R, is of a cut-off absorption below a wavelength of 500 nm, has a high transmittance from above 500 nm to an infrared wave band, and has a room-temperature thermal conductivity of 4 W.m ‑1 ·K ‑1 -1.K-1, and is suitable for manufacturing a 500 nm long-wave-pass optical filter with high stability and high reliability. The application introduces appropriate hexavalent chromium (Cr 6+ ) into a lithium molybdate matrix, and can move an absorption edge and form a required long-wave-pass characteristic by adjusting the content of hexavalent chromium; meanwhile, the high thermal conductivity and mechanical stability of the oxide crystal make it more suitable for high-power transmission and optical application in a harsh environment, and solve the problems of the existing thin film and polymer optical filter in thermal stability and high-power bearing.

The invention relates to the technical field of battery diaphragms, and provides a high-viscosity and high-safety lithium ion battery diaphragm, which is prepared from the following raw materials in parts by weight: 15 to 20 parts of polyolefin, 80 to 85 parts of pore-forming agent and 2 to 4 parts of filler, the viscosity average molecular weight of the polyolefin is 1,000,000 to 4,000,000; the raw materials of the filler comprise a component A and a component B in a mass ratio of (1: 19)-(19: 1); the component A comprises barium stearate; the component B comprises one or more of lithium molybdate, lithium tungstate and lithium tantalate. According to the technical scheme, the problem that the strength of the lithium battery diaphragm in the related technology is relatively low is solved.

The invention relates to a doped lithium molybdate scintillation crystal material and a preparation method thereof, and belongs to the field of crystal growth technology and radiation detection. Aiming at the problem of poor luminescence property of the existing lithium molybdate crystal at room temperature, the invention provides an alkali metal ion doping strategy, a sodium-containing compound (Na2CO3, Na2MoO4 or Na2Mo2O7) is selected as a doping source, and crystal growth is realized through a Bridgman-Stockbarger method. Experiments show that the doping of the sodium-containing compound improves the luminescence property of the lithium molybdate crystal. According to the technical scheme, the luminescent property of the crystal can be improved, and the practical application of the crystal in a low-temperature crystal calorimeter device is further promoted.

A high capacity anode material comprising pre-lithiated α-MoO3 nanostructures is provided. A lithium sulfur full cell, battery, or pouch cell comprising the anode material and methods of fabricating the same are also provided.

The method for preparing adjustable-size lithium molybdate powder by reactive ball milling uses Li2MoO4 as the chemical formula, with a purity ≥99.5% and a particle size satisfying 0.1μm≤D50≤50μm. The powder is white and comprises six steps and conditions: batching, ball milling, sieving and drying, annealing, and pulverizing. This method offers advantages such as precise control of powder particle size, significantly reduced preparation time, simplified preparation process, and improved product yield.