103results about "Borates" patented technology

The invention relates to the technical field of graphene modification, and particularly discloses a preparation method of zinc borate modified graphene, which comprises the following steps: ultrasonically dispersing graphene in water to obtain 0.5-1g / L graphene dispersion liquid; adding a dispersing agent, a 0.08-0.12 mol / L borax aqueous solution and ethanol into the graphene dispersion liquid, uniformly mixing, and then dropwise adding a 0.08-0.12 mol / L zinc sulfate aqueous solution under the stirring action; then carrying out a reaction through microwave heating at the temperature of 50-70 DEG C under the power of 100-300 W for 20-30 min; after the reaction is finished, filtering, washing and drying to obtain zinc borate modified graphene. According to the preparation method of the zinc borate modified graphene, provided by the invention, a uniform, complete and compact shell layer can be formed on the surface of the graphene through in-situ self-assembly, so that the surface of the graphene is textured, and the dispersion uniformity and dispersion stability of the graphene in an oil phase system are improved.

The invention belongs to the technical field of positive electrode materials, and provides a lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing a manganese-based metal ion solution, a precipitator solution and a complexing agent solution to obtain a manganese-based composite material precursor suspension, and drying to obtain a precursor; mixing the precursor with a lithium source, and then sequentially mixing and reacting with a phosphate radical source, a borate radical source and a niobium source to obtain a phosphorus boron niobate coated precursor; and mixing the precursor with a lithium source, and sintering. The invention also discloses the lithium-rich manganese-based positive electrode material prepared by the method. The positive electrode of the lithium ion battery comprises the positive electrode material. The lithium-rich manganese-based positive electrode material disclosed by the invention has a gradient coating structure, and the structure enables the positive electrode material to be high in capacity, good in cycle performance and less in interface side reaction; according to the invention, an in-situ co-firing bonding process is adopted, and a liquid-phase impregnation-segmented sintering integrated process is adopted, so that chemical bonding of a coating layer and a matrix is realized, interface falling is avoided, and the structural stability is enhanced.

The invention provides a coated microcrystal lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The positive electrode material is a lithium-rich manganese-based positive electrode material which is prepared from a lithium-rich manganese-based precursor and has primary particles formed in situ and secondary spheres with surface coatings. The positive electrode material has a unique core-shell structure, the core is a microcrystal lithium-rich material, the shell is a nanoscale solid electrolyte layer, and the shell layer coats primary particles and secondary spheres at the same time; the structure effectively inhibits the interface side reaction between the positive electrode material and the solid electrolyte, and stabilizes the interface structure; a continuous and short Li and charge transmission path is provided, the interface impedance in an all-solid-state battery is remarkably reduced, and the rate capability and the cycling stability of the material are improved.

The invention provides a positive electrode active material, a preparation method thereof, a positive electrode plate containing the positive electrode active material, a full-tab battery cell and an electric device, and relates to the technical field of lithium ion batteries. The positive electrode active material is of a double-spherical particle structure with a glass-phase neck bridge at a contact neck part, each spherical particle comprises an active material body and a coating layer coating the active material body, and the active material body is lithium iron phosphate dispersed with Fe2P; the average thickness tsh of the coating shell layer is equal to 5 to 9 nm; the thickness tcheck of the glass phase neck bridge is 5-25nm, and the total content G of the glass phase in the positive electrode active material is 1.5-2.2 wt%; the volume average particle size of the positive electrode active material is 7-9 [mu] m. According to the positive electrode active material disclosed by the invention, through the cooperation of the coating shell layer, the embedded Fe2P nano second phase and the glass phase neck bridge, the comprehensive performance of a full-tab battery cell and an electric device can be effectively improved.

The present invention relates to a rubidium fluoro-scandium borate compound, a rubidium fluoro-scandium borate nonlinear optical crystal, and a preparation method and application thereof. The rubidium fluoro-scandium borate compound has a chemical formula Rb2ScB3O6F2, does not contain a symmetry center and has a molecular weight of 382.33 g / mol. The rubidium fluoro-scandium borate nonlinear optical crystal belongs to the monoclinic crystal system, and belongs to the non-centrosymmetric space group P21, and the unit cell parameters are: a=4.0372(10) Å, b=11.800(3) Å, c=8.823(2) Å, α=γ=90°, β=98.327(11)°, Z=2. The present invention adopts a high-temperature vacuum packaging method or a solid-state synthesis method to prepare rubidium fluoro-scandium borate compounds. The present invention adopts a fluxing agent method to prepare a rubidium fluoro-scandium borate nonlinear optical crystal, which have the advantages of short absorption cutoff edge, large nonlinear optical effect, good thermal stability, and stable physical and chemical properties. The rubidium fluoro-scandium borate nonlinear optical crystal of the present invention can be used to fabricate nonlinear optical devices, which have important applications in fields such as optics, military, laser lithography, and communication, etc.

The invention provides a single-crystallized and coating-modified lithium-rich manganese-based material as well as a preparation method and application thereof, the preparation method comprises the following steps: carrying out ball-milling mixing on a cobalt-free carbonate precursor material, a lithium source and molten salt, and then carrying out primary calcination, washing and repair heat treatment to obtain a single-crystal cobalt-free positive electrode material; the method comprises the following steps: mixing a single-crystal cobalt-free positive electrode material with a boron source solution, carrying out first coating to obtain a mixture, adding a magnesium source solution into the mixture, carrying out second coating, carrying out solid-liquid separation after coating, washing, drying and carrying out secondary calcination to obtain a gradient coating layer on the surface of the single-crystal cobalt-free positive electrode material, and one side far away from the single-crystal cobalt-free positive electrode material is rich in magnesium. The cobalt-free lithium-rich manganese-based positive electrode material is modified through single crystallization and coating synergistically, so that the problems of structural distortion, poor cycling stability, capacity fading and the like of the lithium-rich manganese-based material are solved, and the electrochemical performance of the lithium-rich manganese-based material is improved synergistically.

The invention discloses a ternary material precursor, a ternary material and a preparation method, and belongs to the field of lithium ion battery positive electrode materials. The ternary material precursor is of a multi-layer composite structure and sequentially comprises a core layer, a first transition layer and a second transition layer from inside to outside, and all the layers are prepared by adopting the same ternary (nickel-cobalt-aluminum) system. Through reasonable design of the proportion and thickness of the ternary system of the core layer and the transition layer, the ternary material precursor gives consideration to the high-capacity characteristic of the high-nickel core and the stability of the shell, and the stable structure of the shell can effectively inhibit the structural change and interface side reaction of the high-nickel material in the charging and discharging process. The phenomena of particle cracking and shell layer falling are reduced, and the material shows excellent specific discharge capacity, good cycle performance and thermal stability when being used as a lithium ion battery positive electrode material.

The mixed powder is a mixed powder for an annealing separator containing MgO as a main agent, wherein the mixed powder contains Al and B, an Al content contained in the entire mixed powder is 0.0007 mass% or more and 0.050 mass% or less, a B content contained in the entire mixed powder is 0.005 mass% or more and 0.040 mass% or less, the B contains tri-coordinated boron, an average particle size of the mixed powder is 0.08 µm or more and 9.0 µm or less, and a formula (1) below is satisfied. 0.06≤Al / BO3<5.00 In the formula (1), [Al] is an Al content (mass%) in the mixed powder, and [BO3] is a content (mass%) of the tri-coordinated boron in the mixed powder.

The embodiment of the invention provides a positive active material and a preparation method thereof, a positive plate, a battery, a battery pack and electric equipment. The positive electrode active material comprises a spherical or sphere-like central particle and a plurality of synapse structures protruding out of the surface of the central particle, and any two synapses form a groove structure on at least part of the surface of the central particle; the positive electrode active material comprises an element M, and the element M comprises one or more of B, Zr, Sr, Mo and W. The positive electrode active material provided by the embodiment of the invention can improve the ion conduction capability and the pole piece stability of the battery, thereby improving the rate capability and the capacity retention rate of the solid-state battery.

The present invention relates to the field of lithium-ion batteries, and discloses a cathode material, a method for manufacturing the same, and a lithium-ion battery. The cathode material is Li 1+a (Ni x Co y Mn z G b )T c O2, where 0.02 ≦ a ≦ 0.1, 0.6 ≦ x ≦ 1, 0 < y ≦ 0.5, 0 < z ≦ 0.5, 0 < b ≦ 0.02, 0 < c ≦ 0.02, and at 45 °C, the (003) characteristic peak around 80 cycles satisfies the relationship of 0° ≦ ΔP = P 前 -P 後 ≦ 0.2°. The cathode material has high particle strength and further excellent crystal structure stability, and the cycle performance of the cathode material is significantly improved.

The invention relates to the technical field of lithium ion battery positive electrode materials, in particular to an aluminum-yttrium-boric acid coated high-nickel positive electrode material and a preparation method and application thereof. The preparation method of the material comprises the following steps: synthesizing a doped and modified high-nickel ternary precursor from a mixed metal salt solution and a first aluminum source and / or a first yttrium source through a coprecipitation reaction; mixing the precursor with a lithium source, and performing first sintering treatment to obtain a base material; and mixing the base material with a solution containing boric acid, a second aluminum source and a second yttrium source, and carrying out solvent evaporation and second sintering treatment to obtain a final product. Through the synergistic effect of bulk phase doping and surface composite coating, generation of intragranular cracks and interface side reaction of the material in the circulation process are inhibited at the same time. The obtained positive electrode material successfully overcomes the technical problem that high capacity and long service life are difficult to consider at the same time, and the cycling stability is remarkably improved while the high specific capacity is kept.

This invention belongs to the field of magnetic refrigeration technology, specifically relating to the application of a hexagonal crystal material Sr6GdSc(BO3)6 in ultra-low temperature magnetic refrigeration. This hexagonal crystal material Sr6GdSc(BO3)6 does not undergo a phase transition at temperatures above 100 mK and exhibits a large magnetocaloric effect near 1 K. The maximum magnetic entropy changes under magnetic field variations of 0–1 T, 0–2 T, and 0–3 T are 39.36 mJ·cm⁻¹, respectively. ‑3 · K ‑1 Or 9.01 J·kg ‑1 ·K ‑1 53.95 mJ·cm ‑3 ·K ‑1 Or 12.34 J·kg ‑1 ·K ‑1 and 59.49 mJ·cm ‑3 ·K ‑1 Or 13.61 J·kg ‑1 ·K ‑1 The hexagonal crystal material Sr6GdSc(BO3)6 of this invention exhibits significant magnetocaloric effects and superior low-temperature performance, and has great application prospects in the field of ultra-low temperature magnetic refrigeration technology.

The present invention generally discloses a metalloid metal oxide coating composition of Formula (I) for the alkali mixed metal oxide based battery cathode. The coating of said composition reduces reaction based degradation of the cathode as well as electrolyte, thereby improving performance, cycle life, and rate capacity of the battery. The present invention further relates to a method of preparing the coated cathode active material and process thereof.

This invention provides a silicon-based anode composite material, its preparation method, and its application. The silicon-based anode composite material comprises a silicon-based core, a boronoxy lattice stabilizer, and an inert material. At least a portion of the boronoxy lattice stabilizer is embedded in the lattice structure of the silicon-based core, and the inert material coats the surface of the silicon-based core. This invention helps improve the initial coulombic efficiency and cycle performance of the silicon-based anode composite material.

Disclosed herein is a single nonlinear optical crystal having a chemical formula of RnBa3(B3O6)3 wherein R is n different rare earth elements selected from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and any combination thereof; and wherein n is 1 to 14. Also disclosed are devices comprising the same and methods of making the same.

The invention discloses light-color-adjustable Al < 3 + >-doped LiMgBO3: Dy < 3 + > fluorescent powder for an LED (Light Emitting Diode) and a preparation method thereof. The chemical formula of the fluorescent powder is LiMg (1-x-y) BO3: xDy < 3 + >, yAl < 3 + >, 0 < = x < = 0.03, and 0 < = y < = 0.04. The preparation method comprises the following steps: weighing raw materials according to a metering ratio, adding 2 wt% of boric acid as a cosolvent after a lithium source is excessive by 5-20%, grinding, mixing, calcining in air at 500-1000 DEG C for 2-15 hours, cooling and grinding to obtain a product. The fluorescent powder generates blue, yellow and red emission under excitation of near ultraviolet light, Al < 3 + > co-doping enhances Dy < 3 + > red light emission, white light output with good color rendering performance is obtained, and the fluorescent powder can be used for packaging near ultraviolet chip WLED devices.

The invention belongs to the technical field of lithium ion battery material recovery, and particularly relates to a direct regeneration method of a ternary positive electrode waste material, a positive electrode material and a lithium ion battery. The direct regeneration method comprises the following steps: mixing the ternary positive electrode waste material, a lithium supplement agent and a structure repairing auxiliary agent B2O3 to obtain a mixture; and sintering the mixture in an oxygen-containing atmosphere. According to the method, B2O3 is introduced as a structure repairing auxiliary agent and has a synergistic effect with a lithium supplementing agent in an oxygen-containing atmosphere, so that crystal structure defects in the waste are effectively repaired, lithium loss is supplemented, and the specific capacity and the cycling stability of the regenerated material are improved.

An object of the present invention is to provide a lithium-based solid electrolyte having excellent ion conductivity, a method for producing a lithium-based solid electrolyte, a modified positive electrode active material, a modified negative electrode active material, an all-solid-state secondary battery, an electrode sheet for an all-solid-state secondary battery, a solid electrolyte sheet, and an electrode for an all-solid-state secondary battery.The lithium-based solid electrolyte of the present invention contains amorphous lithium tetraborate, water, and a lithium salt, in which a content of the water is 45% by mass or less with respect to a total mass of the lithium-based solid electrolyte.

The invention belongs to the technical field of chemical hazardous waste resourceful treatment, and relates to a treatment method and a treatment system for waste acid generated in an acetylene cleaning process in BDO production. The treatment method comprises the following steps: (1) adding magnesium oxide into the waste acid to neutralize part of sulfuric acid; (2) further adding calcium hydroxide into the waste acid until the pH value of the system is neutral, and carrying out solid-liquid separation to obtain a neutralized solution and a slag phase containing heavy metals and arsenic; (3) carrying out oxidation reaction on the neutralization solution and ozone under the catalysis of a catalyst, then carrying out vulcanization reaction on the neutralization solution and a sodium sulfide solution, filtering a reaction product to obtain filtrate, and crystallizing the filtrate to obtain MgSO4. 7H2O; and (4) mixing the slag phase with sodium tetraborate decahydrate, carrying out a hydrothermal reaction, and drying the product to obtain the Mg5Ca3B2O12 flame-retardant material. According to the treatment method and system, the recycling rate is high, the treatment cost is low, the economic value is high, the environment is protected, the technological process is easier to control, and the high-concentration waste acid generated in the acetylene cleaning procedure is treated.

A main object of the present disclosure is to provide a cathode active material capable of suppressing the reaction with a solid electrolyte. The present disclosure achieves the object by providing a coated cathode active material comprising: a cathode active material, and a coating portion coating at least a part of a surface of the cathode active material, and the coating portion includes a scandium lithium phosphate based compound or a lithium borate based compound.

The invention discloses a radiation refrigeration material and a preparation method and application thereof, and belongs to the technical field of refrigeration materials.The preparation method comprises the following steps that lanthanum chloride hydrate and boric acid are mixed and dissolved in water according to the molar ratio of 1: (1.4-1.5), a mixed solution is obtained, and after moisture of the mixed solution is removed, the radiation refrigeration material is obtained; and transferring into an environment of 280-320 DEG C, preserving heat for 1-2 hours in an air atmosphere, carrying out first-stage heat treatment, then heating to 680-720 DEG C, preserving heat for 4-6 hours in the air atmosphere, carrying out second-stage heat treatment, and purifying the obtained product to obtain the radiation refrigeration material LaBO3 nanosheet. The material has an irregular lamellar morphology, the low-dimensional structure of the material significantly inhibits phonon conduction, the ultra-low intrinsic thermal conductivity of 0.6-0.65 W.m <-1 >. K <-1 > is achieved within the range of 300-500 DEG C, and the material has the advantages of efficient radiation heat dissipation and ultra-low thermal conductivity heat insulation in an extreme high-temperature environment.

The invention provides a positive electrode active material and a preparation method and application thereof. The positive electrode active material comprises a lithium-rich manganese-based material core, a first coating layer coating the lithium-rich manganese-based material core, and a second coating layer coating the first coating layer, the first coating layer is made of Li4-xM1xSiO4, x is greater than 0 and less than or equal to 4, M1 is selected from at least one of Y, Ce, La, Al, Fe, Sm, Ti, Zn, Cu, Mg, Na, K, Ca, Zr, Sr, W and Sn, the lithium-rich manganese-based material core has the M1, the M1 is selected from at least one of Y, Ce, La, Al, Fe, Sm, Ti, Zn, Cu, Mg, Na, K, Ca, Zr, Sr, W and Sn, and the second coating layer is selected from at least one of Y, Ce, La and Al. And the second coating layer is made of a carbon material and a lithium supplementing material. The positive electrode active material provided by the invention is good in first effect and cycle performance, and is beneficial to improving the electrochemical performance of a positive electrode plate and a battery.

The present invention discloses a method for preparing a single crystal sodium ion battery positive electrode active material, the single crystal sodium ion battery positive electrode active material includes sodium, M metal, boron and oxygen elements, and the preparation method includes the steps of adding water to an M element-containing compound, a boron element-containing compound and a sodium source, preparing a slurry, and sanding the slurry to obtain a mixed slurry, and spray-drying and sintering the mixed slurry to obtain the single crystal sodium ion battery positive electrode active material. The preparation method of the present invention is applicable to a wide variety of raw materials, and can efficiently realize uniform mixing of various raw materials at the nano level, and the mixed slurry can form a perfect layered O3 phase structure after sintering, and the prepared single crystal sodium ion battery positive electrode material can be used to provide excellent electrochemical performance and cycle performance in sodium ion batteries.

The invention provides a positive electrode active material, a preparation method, a secondary battery and an electric device. The chemical general formula of the positive electrode active material is Li Ni < x > Co < y > Mn < 1-x-y > M N < c > O < 2 >; wherein a is more than or equal to 0.95 and less than or equal to 1.05 0.8 < = x < = 1; 0 < = y < = 0.2; 0.001 < = b < = 0.01; c is greater than or equal to 0.001 and less than or equal to 0.01, and M element comprises at least one of Ca, Sr, Ba, B and F; the N element comprises at least one of Zr, Al, Ce, Ti, La, Ta, W, Nb, Cr, Mo, Y, In, Sn and P; a lt of the positive electrode active material XRD; 003gt, 003gt; the crystal face diffraction peak beta is equal to k tan theta, beta is the half-peak width, 2 theta is the diffraction peak position, k is a constant, and k is larger than or equal to 1.07 and smaller than or equal to 1.27. The positive electrode active material has high capacity and high structural stability. The invention also provides a preparation method of the positive electrode active material, which can inhibit the generation of defects in the crystal in the sintering process and promote the uniform diffusion of the lithium element into the crystal lattice. The invention further provides a secondary battery and an electric device, and the cycle performance of the secondary battery and the electric device is remarkably improved.

The present invention addresses the problem of providing: a lithium-based solid electrolyte which has excellent ion conductivity; a method for producing a lithium-based solid electrolyte; a modified positive electrode active material; a modified negative electrode active material; an all-solid-state secondary battery; an electrode sheet for all-solid-state secondary batteries; a solid electrolyte sheet; and an electrode for all-solid-state secondary batteries.　A lithium-based solid electrolyte according to the present invention contains lithium tetraborate in an amorphous state, water and a lithium salt. With respect to this lithium-based solid electrolyte, the content of water is 45% by mass or less relative to the total mass of this lithium-based solid electrolyte.

This application provides a polycrystalline ultra-high nickel ternary cathode material and its preparation method, a lithium-ion battery, and an electrical device, relating to the field of lithium-ion batteries. The polycrystalline ultra-high nickel ternary cathode material includes a core, a first coating layer, and a second coating layer; the core has the general chemical formula LiNi. X M y M' Z O2; M includes at least two of Co, Mn, and Al, and M' includes at least two of Zr, Sr, Y, Sb, Al, W, Ta, Mg, Ca, Ti, Mo, and Nb; the first coating layer includes a lithium-M'' multi-element oxide composite, where M'' includes at least two of Sb, Al, Co, Ti, W, and P; the second coating layer includes a lithium-M''' oxide composite, where M''' includes one or more of B, Al, W, and Ti. This polycrystalline ultra-high nickel ternary cathode material exhibits excellent high-temperature storage performance and capacity.

An object of the present invention is to provide a lithium-based solid electrolyte having excellent ion conductivity, a method for producing a lithium-based solid electrolyte, a modified positive electrode active material, a modified negative electrode active material, an all-solid-state secondary battery, an electrode sheet for an all-solid-state secondary battery, a solid electrolyte sheet, and an electrode for an all-solid-state secondary battery. The lithium-based solid electrolyte of the present invention contains amorphous lithium tetraborate, water, and a lithium salt, in which a content of the water is 45% by mass or less with respect to a total mass of the lithium-based solid electrolyte.

The invention discloses a preparation method and application of oil-soluble nano rare earth borate, and belongs to the field of borate preparation.The preparation method of the oil-soluble nano rare earth borate comprises the following steps that S1, borax and a solvent are stirred and mixed till borax is completely dissolved, a solution A is obtained, S2, rare earth borate and the solvent are stirred and dissolved, then a surface modifier is added, and a solution B is obtained; and S3, slowly dropwise adding the solution B into the solution A to obtain a mixed solution, adjusting the pH value of the mixed solution to 12-14, continuously stirring for 0.8-1.2 h, then transferring the mixed solution into a reaction kettle, carrying out a heating reaction, cooling to room temperature after the reaction is finished to obtain a precipitate, and sequentially washing, drying and grinding the precipitate to obtain the oil-soluble nano rare earth borate. The oil-soluble nano rare earth borate is prepared by combining a hydrothermal method with an oleic acid surface modification technology, and the oil-soluble nano rare earth borate serving as a lubricating oil additive is convenient to prepare, excellent in performance, good in anti-wear and anti-friction effect, green, environment-friendly and wide in applicability.