127results about How to "Good magnification" patented technology

An x-ray microscope uses a microfocus x-ray source with a focus spot of less than 10 micrometers and a Wolter condenser having a magnification of about four or more for concentrating x-rays from the source onto a sample. A detector is provided for detecting the x-rays after interaction with the sample, and an x-ray objective is used to form an image of the sample on the detector. The use of the Wolter optic addresses a problem with microfocus sources that arise when the size of the focal spot that must then be imaged onto the sample with the condenser is smaller than the field of view.

An inverted real image forming opthalmoscopic contact lens provides for viewing and treating structures within an eye. The lens comprises a contacting surface adapted for placement on the cornea of the eye, a concave annular anterior reflecting surface, a convex annular posterior reflecting surface, and two non-reflective portions. A first non-reflective portion is positioned along the lens axis and proximate to the convex annular posterior reflecting surface. A second non-reflective portion is positioned along the lens axis and proximate to the concave annular anterior reflecting surface. A light beam emanating from the structure of the eye enters the lens and contributes to the formation of an inverted real image of the structure through an ordered sequence of reflections of the light beam, first in a posterior direction from the anterior concave reflecting surface and next as a negative reflection in an anterior direction from the convex posterior reflecting surface.

The invention discloses a preparation method of a graphene/lithium titanate composite anode material, which comprises the following steps: compounding compounds serving as a lithium source and a titanium source and graphene oxide through a liquid-phase method and reducing graphene oxide of the compound in inert gas mixed with reducing gas into graphene so as to obtain the graphene/lithium titanate composite anode material. The method has the characteristic of realizing uniform distribution of graphene in lithium titanate through an in-situ compounding technique. Under the same conditions, the discharge time of a hybrid capacitor which respectively takes the graphene/lithium titanate composite anode material and activated carbon as the anode and cathode is obviously greater than that of an electric double-layer capacitor which takes activated carbon as an electrode and that of a hybrid capacitor which respectively takes lithium titanate and activated carbon as the anode and cathode. The lithium titanate phase purity of a hybrid supercapacitor and lithium ion battery composite anode materials prepared by the method disclosed by the invention is higher. Furthermore, the preparation method further has the characteristic of easily realizing the large-scale industrial production.

The present invention provides an optical pickup device which realizes an optical system having an optical magnification suitable for each disc format between three optical discs and a light emitting means for emitting a laser beam having a wavelength corresponding to each disc in the optical system of the optical pickup for recording and/or reproducing an information signal to the optical discs and which prevents the number of components from being increased to simplify the composition of the optical system, thereby preventing the length of an optical path from being lengthened, the optical pickup from being increased in size. The optical pickup device has a first light emitting unit for emitting a laser beam having a first wavelength and a laser beam having a second wavelength, a second light emitting unit for emitting a laser beam having a third wavelength, a first collimator lens for transmitting the laser beam having the first wavelength and the laser beam having the second wavelength, a second collimator lens for transmitting the laser beam having the third wavelength, a first objective lens for transmitting the laser beam having the first wavelength transmitted through the first collimating lens or the laser beam having the third wavelength transmitted through the second collimator lens, and a second objective lens for transmitting the laser beam having the second wavelength transmitted through the first collimator lens.

The invention discloses a preparation method of a spherical high-capacity lithium-rich positive electrode material. A sintering process is improved through regulating a coprecipitation reaction mode. The preparation method comprises the following steps: 1, preparing a nickel-cobalt-manganese sulfate solution; 2, performing a coprecipitation reaction on the nickel-cobalt-manganese sulfate solution and a mixed solution of a carbon carbonate solution and ammonia water at a pH value of 7-9 to obtain a solid-liquid mixture of a precursor; 3, filtering, separating, washing and drying to obtain a carbonate precursor; 4, performing gradient temperature rise on the carbonate precursor in a tubular furnace and keeping the temperature, cooling, crushing and sieving to obtain a nickel-cobalt-manganese oxide; and 5, mixing the nickel-cobalt-manganese oxide with lithium carbonate powder, and performing multi-section ventilation roasting in the tubular furnace to obtain the target object. The preparation method has the advantages that the sintering process is improved through regulating the coprecipitation reaction mode, the granularity of the precursor is effectively controlled, and the high-capacity lithium-rich lithium ion positive electrode material with a layered crystal structure, which is high in energy density, good in rate capability, low in cost, good in safety and long in service life, is prepared, and the market demand is met.

A dual magnification reversible spot mirror device includes two mirrors having different magnifications, e.g., 5X and 10X, mounted back-to-back in a cylindrical frame ring which has an outer cylindrical wall surface from which protrudes a circumferential annular ring-shaped rib, and a mirror frame holder which has protruding forwardly from a base thereof a plurality of circumferentially spaced apart, longitudinally disposed flange walls which are elastically deformable in a radially outwardly direction from a longitudinal center line perpendicular to the base. Retainer lips protruding radially inwardly from inner longitudinal wall surfaces of the flange walls are forced radially outwardly in response to rearward forcible contact with the lips by the frame rib, whereupon the flange walls deflect elastically inwardly to an undeformed position in which the mirror frame ring with a reversible selected mirror facing outwards is captivated between a front wall surface of the base and rear surfaces of the flange wall lips. The base of the mirror frame holder is pivotably mounted to a mounting base which has suction cups protruding rearwardly therefrom for releasable attachment to a flat surface such as the vertical surface of a larger wall or cabinet mirror, or the horizontal surface of a table top or vanity.

The invention discloses a high-nickel cobalt-free quaternary positive electrode material and a preparation method thereof. The chemical formula of the positive electrode material is LiNixMnyMzN(1-x-y-z)O2, wherein x is greater than or equal to 0.8 and less than 1, y is greater than 0 and less than 0.2, z is greater than 0 and less than 0.2, and M and N are combinations of any two of Al, Mg, Zr, Ti, Cr, W, V, Ce, Fe, Cu, Zn and Nb. The method has the main advantages that an expensive cobalt element is not used, an ammonia water complexing agent is not used in the precursor preparation process,the alkali content of the surface of the high-nickel cobalt-free quaternary positive electrode material obtained through primary sintering is low, and the washing and secondary sintering processes ofthe material are not involved, so the preparation cost is greatly reduced; and besides, the high-nickel cobalt-free quaternary positive electrode material has excellent rate capability, the specific capacity at 1 C rate reaches 200 mAh/g or above, the cycling stability is excellent, and the capacity retention ratio exceeds 95% after 500 cycles.

The invention discloses a preparation method of high-efficiency lithium-ion battery slurry. The preparation method comprises 1: adding a powdery active material, a conductive agent and a binder into amixer and carrying out uniform stirring, 2: adding 10 to 40wt% of a solvent into the powdery material obtained in the step 1 and carrying out stirring, 3: adding 30-60 wt% of a solvent into the materials in the step 2 and carrying out stirring, and 4, adding the rest of the solvent into the materials in the step 3, carrying out stirring, carrying out filtration through a screen and discharging the materials. The preparation method reduces processes, is simple and easy, shortens stirring time and improves production efficiency. The prepared slurry is uniform and stable, is not easy to layer and improves lithium-ion battery rate and cycle performances.

The invention relates to an in-situ nitrogen-doped porous core-shell-structured carbon/selenium composite material. According to the invention, a core-shell-structured porous carbon nano-material withnitrogen-containing ZIF-8 selected from metal-organic frameworks as a core and ZIF-67 selected from metal-organic frameworks as a shell is used as a precursor, and the prepared porous carbon nano-material has a core shell structure; a metal-organic framework material having a three-dimensional interlocking-pore structure and containing nitrogen is used as a precursor; and the prepared porous carbon/selenium composite positive-electrode material is large in the pore size of the core and small in the pore size of the shell. The prepared composite material is uniform in pore size distribution and small in the size of carbon nanoparticles, can be thoroughly infiltrated by an electrolyte and shortens an electron transport path; and micropores and mesopores in the composite material improve theload capacity of selenium and have good restriction effect on the shuttle effect of selenium, so the composite positive-electrode material is effectively improved in cycle stability and capacity retention ratio.

Disclosed is a preparation method of a nitrogen-doped carbon composite transition metal carbodiimide material. The method comprises the steps of: grinding an inorganic transition metal salt and a carbon and nitrogen containing organic compound to obtain a mixture, the mass ratio of the inorganic transition metal salt to the carbon and nitrogen containing organic compound in the mixture being 4:1-1:7; holding the mixture in an argon atmosphere at 140-200 DEG C for 10-50 min, and then holding at 300-700 DEG C for 30 min to 4h to obtain the nitrogen-doped carbon composite transition metal carbodiimide material. By compounding the prepared transition metal material structure with a nitrogen-doped carbon material, the conductivity and structural stability of the material during charge and discharge can be significantly improved. The nitrogen-doped carbon composite transition metal carbodiimide material prepared by the method has extremely high sodium ion storage performance, high charge anddischarge capacity and excellent rate performance.

The invention provides a high-performance core-shell structure positive electrode material and a preparation method thereof. The preparation method comprises the following specific steps: (1) preparing a mixed solution A and a mixed solution B of nickel, cobalt and manganese salts with different molar components, and independently preparing a salt solution containing an X element; (2) respectively and simultaneously adding the solution A, an alkali solution and a complexing agent solution into a reaction kettle, and carrying out coprecipitation reaction to obtain an inner core; (3) adding the X salt solution and a precipitator solution to obtain an inner core with a coating layer; (4) adding the solution B, the alkali solution and the complexing agent solution into the base solution of the inner core with the coating layer to obtain a core-shell precursor with an interlayer; and (5) roasting to obtain the core-shell positive electrode material. According to the core-shell positive electrode material disclosed by the invention, due to the existence of the interlayer, a gap generated due to different volume changes of the inner core and the outer shell can be overcome, so that the connection force between the outer shell and the inner core is enhanced, and compared with a common core-shell positive electrode material, the core-shell positive electrode material has relatively excellent thermal stability and relatively long cycle performance.

The invention provides a preparation method of a carbon nanotube lithium titanate composite cathode material. The preparation method includes: ultrasonically dispersing carbon nanotube powder into a solvent to obtain a carbon nanotube solution A; under a stirring or ultrasonic condition, adding a lithium source compound, a titanium source compound and a catalyst into the solution A, and regulating pH to obtain a solution B; using a liquid-phase method to process the solution B, and drying obtained solid to obtain carbon nanotube lithium titanate composite precursor powder; calcining the precursor powder in inert gas, and cooling to obtain the carbon nanotube lithium titanate composite cathode material. The preparation method has the advantages that the prepared carbon nanotube lithium titanate composite cathode material is high in electron conductivity and ion conductivity, high in phase purity and good in circulation stability, and large-scale production can be achieved easily.

The invention discloses a preparation method of a composite anode material of a lithium-ion power battery. The composite anode material comprises LiNi1/3Co1/3Mn1/3O2 and carbon nano tubes (CNTs). According to the preparation method, citric acid is used as a chelating agent, ethylene glycol is used as a cross-linking agent, and the composite anode material LiNi1/3Co1/3Mn1/3O2/CNTs of a lithium-ion battery is prepared through a Pechini method and a high-energy ball milling method. Compared with the traditional precipitation type preparation method, the preparation method provided by the invention is simpler, and the synthesized composite anode material LiNi1/3Co1/3Mn1/3O2/CNTs have the characteristics of high specific capacity, high cycle performance, excellent rate capability and the like.

The invention relates to a carbon-based compounded ferric cyanamide material and a preparation method thereof. The carbon-based compounded ferric cyanamide material comprises ferric cyanamide and carbon compounded with the ferric cyanamide. According to the material, the ferric cyanamide is compounded with the carbon, so that the problem that the volume of ferric cyanamide is increased can be effectively solved, meanwhile due to compounding of the two materials, the reaction activity of a battery can be further improved, the battery can be relatively stable in structure, and the multiplying power and the circulation performance of the battery can be improved.

A carbon-coated molybdenum sulfide/water hyacinth biomass carbon composite material and a preparation method and use thereof comprise the following steps of: Including: the first step, using sodium molybdate and thioacetamide as raw materials, through a 160-200 DEGC hydrothermal method, growing a MoS2 nanosheet array on the surface of the bulbous water hyacinth biomass carbon; the second step, 80-100 DEG C water bath method is coated on the MoS2 nanosheet array with a layer of dopamine polymer; the third step is to carbonize the polymerized dopamine to form a carbon coating layer by calcination at 500 to 800 DEG C in an inert atmosphere to obtain carbon coated molybdenum sulfide. /Water hyacinth biomass carbon core shell composite. The invention has simple operation, large output and uniform coating layer . The invention has the advantages of simple operation, large output and uniform coating layer. The composite material has the advantages of low cost, high reversible charge-dischargecapacity, long cycle life and excellent rate performance when it is used as a sodium ion negative electrode material.

The invention belongs to the field of electrode materials, and discloses a high-loadng self-supporting thick electrode prepared through phase inversion and a preparation method and application thereof. The electrode prepared by the process has the following advantages: 1) a current collector, a binder and additional conductive carbon are not needed, so that the overall energy density of the electrode is greatly improved; 2) the thickness of the electrode is 300-3000 [mu]m, the loading capacity is 8-55 mg cm <-2 >, the thick electrode can improve the proportion of active materials in the wholeenergy storage equipment, and the energy density of the whole energy storage equipment is improved; 3) compared with a thin electrode, under the condition of achieving the same energy storage capacity, the high-loading thick electrode has fewer preparation steps and is lower in production cost; and 4) the electrode is provided with micron-sized finger-shaped holes communicated with the surfaces ofthe two electrodes and hundred-nanometer-sized holes dispersed in the whole electrode, and the holes ensure that the electrode has excellent rate capability even under a high loading capacity. The method promotes the industrial application and mass production of the high-loading self-supporting thick electrode.

The invention relates to the fields of energy storage technology and power battery material technology, and specifically relates to a lithium iron phosphate-modified conductive carbon black composite electrode material preparation method. The preparation method comprises (1) a step of subjecting common conductive carbon black to annealing treatment, and then performing oxidation treatment in a strong oxidant to prepare the modified conductive carbon black; and (2) a step of preparing the lithium iron phosphate-modified conductive carbon black composite electrode material. According to the invention, by addition of modified SP which is easily dispersed, the composite electrode material prepared by the invention has small specific surface, thus facilitating battery preparation.

The present invention relates to silica particles for an electrode material, and the silica particles are characterized in that the silica particles comprise silicon monoxide particles having a general formula SiOx; and a carbon layer, wherein the silicon monoxide particles are bonded by the carbon layer, and the silicon monoxide particles bonded by the carbon layer are coated by the carbon layer.The silica particles are compact, narrow in particle size distribution and small in specific surface area, and have the advantages of high capacity, high coulombic efficiency, low expansion, high cycle retention rate and the like.

The invention provides a preparation method of a sodium ion battery negative electrode material, the negative electrode material and a sodium ion battery. The preparation method of the sodium-ion battery negative electrode material comprises the following steps: (1) hydrothermal reaction: uniformly stirring phenylenediamine, tannic acid and graphene oxide in water, transferring into a reaction kettle, and carrying out hydrothermal reaction to obtain a compound; (2) carbonization reaction: carbonizing the compound in a carbonization furnace at 400-700 DEG C. In the preparation method disclosed by the invention, phenylenediamine and tannic acid can form a hard carbon material on the basis of graphene after being carbonized, more ion diffusion channels are provided, and the high-rate charge-discharge performance is improved. The phenylenediamine and the tannic acid can be used for carrying out heteroelement doping on the formed graphene composite material, so that part of active sites of the material are increased, and the overall material capacity is improved. Moreover, the carbonized graphene composite material doped with N and O also has relatively high conductivity, and when the graphene composite material is prepared into a negative plate, the addition of a conductive agent can be reduced, so the manufacturing cost of the battery is reduced.