33results about How to "High magnification" patented technology

This invention relates to a boron-doped multi-element polyanionic sodium-ion battery cathode material and its preparation method, comprising the following steps: [The method involves] mixing Na₄Fe₂O₃ with... 3‑X B X (PO4) 2‑Y (SiO4) Y The stoichiometric ratio of P2O7 is determined by adding ferrous source, boric acid, sodium source, phosphorus source, and silicon source to water, followed by the addition of carbon source and mixing thoroughly to obtain a mixed slurry; wherein 0.2≤X≤0.5, 0<Y≤1; the mixed slurry is then ground to obtain a sand-milled slurry; the sand-milled slurry is dried to obtain precursor powder; under a protective atmosphere, the precursor powder is sintered at 450~550℃ to obtain boron-doped multi-element polyanion sodium-ion battery cathode material. The introduction of boron and silicon elements in this invention helps reduce raw material costs, improve the electrochemical performance of the material, especially enhancing the structural stability, rate performance, and cycle life of the cathode material, and also lowers the sintering temperature, meeting the requirements for cost reduction and efficiency improvement.

The invention provides a method for synthesizing 6-aminocapronitrile from caprolactam. The method comprises the following steps: a gasification device is sequentially provided with a uniform distribution part, an efficient dispersion part, a high-temperature gasification part and an in-situ separation part from top to bottom; liquid-phase caprolactam is injected from the top end of the gasification device, and ammonia gas is injected through the efficient dispersion part; in the efficient dispersion part, liquid-phase caprolactam is broken in a first circular tube nest under the shearing action of gravity and ammonia gas to form liquid drops, and after high-temperature gasification, a gas phase is output from the side part of the gasification device, then enters the reactor filled with the monolithic catalyst from the bottom of the reactor, reacts through the monolithic catalyst and is output from the top of the reactor. According to the invention, caprolactam can be efficiently gasified, coking is not easy to generate, the retention time of a gas-phase reactant in the reactor can be accurately controlled, the reaction efficiency is greatly improved, the discharge amount of wastes in the production process of hexamethylenediamine is reduced, the cost is reduced, the economic benefit is improved, and a guarantee is provided for green, environment-friendly and safe production.

The invention relates to the technical field of power electronic direct-current converters, in particular to an input and output common-ground high-gain boost converter which comprises a direct-current voltage source Vin, diode components D0-D4, capacitor components C0-C4, a first coupling inductor L1, a second coupling inductor L2, a first mosfet tube S1, a second mosfet tube S2 and a resistor R. The two main loops operate in a staggered mode, so that input current is continuous, input current ripples are small, relatively stable energy is continuously provided for the circuit, the voltage multiplication unit is adopted, the amplification factor of the circuit is increased, the duty ratio of the mosfet tubes S1 and S2 is adjusted, and small current ripples can be kept even under the condition that the boost factor is large. The device has the advantages of high step-up ratio, low device stress, high efficiency, easiness in control and implementation, lower cost and the like, and is suitable for a new energy power generation scene needing high direct current bus voltage grid-connected output under a low input voltage condition.

This invention provides a halide solid electrolyte and its preparation method, belonging to the field of solid electrolyte technology. First, alkylphosphonic acid is reacted with lithium carboxylate to prepare lithium-ionized alkylphosphonic acid. Then, the lithium-ionized alkylphosphonic acid is mixed with a halide electrolyte, and the mixture is dispersed in a solvent, stirred, filtered, and dried to obtain a halide solid electrolyte coated with lithium-ionized alkylphosphonic acid. This invention constructs a dense, uniform hydrophobic protective layer on the surface of halide electrolyte particles through in-situ coating with long-chain lithium alkylphosphonate, effectively isolating moisture and oxygen from the environment and significantly improving the air stability of the halide electrolyte. Simultaneously, this coating layer helps reduce the interfacial impedance between the electrolyte and electrode materials, optimizing the overall ionic conductivity of the material.

The application provides a flaky flower-like single-crystal sodium vanadium oxyfluorophosphate / carbon composite material, a preparation method thereof and a sodium ion battery. The flaky flower-like single-crystal sodium vanadium oxyfluorophosphate material is prepared through a hydrothermal reaction. A surfactant is used to control the crystal face growth direction in the material synthesis process, so that the sodium vanadium oxyfluorophosphate grows to form a flaky flower-like single-crystal structure, and then the ion transmission distance is shortened, the ion kinetic characteristics of the material can be effectively improved, and on the basis of ensuring the structural stability of the material, that is, the cycle performance, the rate characteristics of the material are effectively improved. Through carbon coating, the electronic conductivity of the surface of the material particles is improved, and the capacity rate performance of the material is effectively improved.

The application relates to the field of carbon nanotube catalyst materials, and specifically discloses a catalyst and a preparation method thereof, an array type carbon nanotube and a preparation method thereof. A catalyst is formed into a sheet-shaped nanocrystalline grain, and the sheet-shaped nanocrystalline grain comprises at least one kind of microwave active metal ion. The preparation method of the catalyst comprises the following steps: S1, microwave-assisted reaction; S2, standing and aging; and S3, calcination treatment. An array type carbon nanotube is prepared by catalysis of the catalyst, the array type carbon nanotube has a plurality of unit carbon nanotube bundles, the unit carbon nanotube bundle comprises a plurality of carbon nanotubes which are intertwined and have a tube length greater than 1 mu m, and the tube diameter of the unit carbon nanotube bundle is 0.2-2 mu m. The carbon nanotube prepared by catalysis of the catalyst has a consistent length-diameter ratio, good orientation and high purity, so that the excellent performance of the carbon nanotube can be brought into play.

The invention provides a graphene / activated carbon composite material and a preparation method and application thereof, and belongs to the technical field of nano materials, the graphene / activated carbon composite material comprises a carbon matrix and a two-dimensional sheet material covering the carbon matrix; the carbon matrix is an activated carbon material and is a carbon material prepared by performing high-temperature pyrolysis on magnesium citrate in a high-temperature self-propagating reaction process; the two-dimensional sheet material is a graphene material and is a few-layer carbon material which is prepared by converting CO2 through a high-temperature self-propagating reaction and is formed by arranging carbon atoms according to a honeycomb-shaped two-dimensional lattice. According to the invention, graphene is used as a conductive and structural dual skeleton; and a hierarchical pore structure is constructed by utilizing gas production and template effect in the reaction process, so that the electrochemical performance of the active carbon positive electrode is improved. And a proper amount of graphene can provide more active sites and maintain the structural stability at the same time, so that the specific capacity and the cycle life are remarkably improved and prolonged, and the material has a wide application prospect and is particularly suitable for preparing a high-performance lithium ion capacitor positive electrode material.

This invention relates to the field of sodium-ion battery technology, and discloses a sodium-ion cathode material, its preparation method and application, a sodium-ion battery, a sodium-ion battery pack, and a device. The sodium-ion cathode material includes a matrix and a coating layer covering the matrix; the matrix has the composition shown in Formula I: Na 1‑x [Ni y Mn z M u Ti v O2 Formula I; the coating layer has the composition shown in Formula II: Na 2‑β Ti 6‑α M′ α O 13 Formula II. This sodium-ion cathode material possesses characteristics such as high ionic and electronic conductivity, strong structural stability, and strong chemical stability. Furthermore, using this composite cathode material in sodium-ion batteries can effectively improve the battery's electrochemical performance.

The application discloses a preparation method of a nanoscale multi-metal catalyst, which comprises the following steps: mixing ferric nitrate, magnesium nitrate, lanthanum nitrate, gadolinium nitrate, ammonium heptamolybdate and citric acid with water to obtain a concentrated solution by heating and concentrating; mixing ethylenediaminetetraacetic acid, ammonia water and urea to obtain an ethylenediaminetetraacetic acid solution; mixing the concentrated solution and the ethylenediaminetetraacetic acid solution to obtain a mixed solution by stirring, adding a surfactant into the mixed solution and calcining, and finally roasting. The ferric nitrate, the magnesium nitrate, the lanthanum nitrate and the gadolinium nitrate are mixed, a complexing agent is added, a solution is prepared by using a complexing method, the solution is concentrated, calcined and sieved, and finally the nanoscale multi-metal catalyst is formed. The catalyst prepared by the method has a uniform particle size. The catalyst prepared by the method is combined with a plasma technology to prepare a single-walled carbon nanotube, and the single-walled carbon nanotube (without treatment) has a high ratio, a large IG / ID and a small powder resistance.

This invention provides a bipolar electrode and a bipolar all-solid-state battery. The bipolar electrode comprises a positive electrode film, a current collector, a bulk material layer, and a carbon material layer. Through the design of the carbonaceous framework and nucleating agent in the bulk material layer, efficient and dense lithium metal deposition is achieved under high voltage conditions. The carbon material layer significantly improves the interfacial contact between the bulk material layer and the all-solid-state electrolyte, reduces interfacial resistance, and improves the deposition and extraction efficiency of lithium metal in the bulk material layer. Furthermore, the carbon material layer provides storage space for lithium metal deposited from the positive electrode, mitigating volume changes during lithium metal deposition in the bulk material layer and improving the stability of the bipolar electrode. The bipolar all-solid-state battery fabricated using the bipolar electrode exhibits high rate capability and long lifespan.

The invention belongs to the technical field of new energy, and particularly relates to a coated lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing an acrylamide polymer and a metal coating agent, and performing spray drying to obtain a mixture; and S2, coating the surface of the lithium-rich manganese-based positive electrode material with the mixture, and sintering to obtain the coated lithium-rich manganese-based positive electrode material. The coated lithium-rich manganese-based positive electrode material provided by the invention has high capacity, high magnification and high cycle performance.

This invention discloses an optical system and a projection device. The optical system has an object side and an image side arranged opposite each other along the optical axis. From the object side to the image side, the optical system sequentially includes a zoom lens assembly and a focusing lens assembly. The zoom lens assembly includes a first lens assembly with negative optical power, an aperture stop, a second lens assembly with positive optical power, and a third lens assembly with positive optical power, arranged sequentially from the object side to the image side. The aperture stop and the second lens assembly are fixed in position relative to the image side. The first lens assembly and the third lens assembly can move closer to each other or further away from each other along the optical axis to enable the optical system to zoom. The focusing lens assembly has positive optical power and can move to a corresponding position along the optical axis to enable the optical system to focus, thus solving the problem of low zoom efficiency in existing optical lenses.

The present application relates to a new type of negative electrode material for lithium ion batteries, and particularly relates to a boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material and a preparation method thereof. The boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material is prepared by mixing a resin with a template agent, doping a boron source, adding a spheroidizing agent and an initiator for spheroidization polymerization, removing impurities and drying, and then performing gas-phase etching to form pores. Silicon is deposited in the pores of the porous carbon and a carbon layer is deposited on the surface of the silicon-carbon precursor by twice chemical vapor deposition, so as to obtain the boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material. The boron element is doped to optimize the electronic conductivity, the spheroidized porous carbon structure is improved to improve the lithium ion transmission channel and enhance the substrate stiffness, and the material has excellent performance of high rate, low expansion and long cycle, so as to solve the problems of insufficient rate performance, low substrate strength and blocked lithium ion transmission of the existing gas-phase silicon-carbon composite negative electrode material in the prior art.

The application discloses a lithium metal negative electrode organic-inorganic hybrid protective layer and a preparation method and lithium metal battery thereof, and belongs to the field of lithium metal batteries. The application adopts a gas-liquid interface self-assembly strategy to make a chloroamide compound and a diisocyanate compound react at high temperature in anhydrous toluene, and obtains a functional polymer by referring to the principle of biological mineralization; the functional polymer is dissolved in an organic solvent after purification to obtain a coating liquid, and an ultrathin, dense and multi-level structure organic-inorganic hybrid protective layer is constructed on the surface of lithium metal through interface self-assembly and solidification into a film. The organic component in the protective layer can densify the interface structure, uniformly guide lithium ion deposition and inhibit dendrites; the inorganic component can regulate the solvation structure of lithium ions, reduce the migration energy barrier and improve the interface transmission kinetics. The protective layer can inhibit the growth of dendrites and significantly improve the cycle and rate performance of the battery. The method has simple process, mild conditions and easy scale production, and provides a practical solution for high-performance lithium metal negative electrodes.

The application provides a battery pack and an electric device. The battery pack comprises a shell, a battery module and a first gel body. The shell comprises a bottom plate, a first side plate and a second side plate. The battery module is located between the first side plate and the second side plate. The battery module comprises a plurality of battery cells arranged along a third direction. Each battery cell comprises an electrode assembly, a packaging bag and a tab connected to the electrode assembly. The packaging bag has a sealing part. The tab extends from the sealing part to the outside of the packaging bag. There is a first space between the sealing parts of two adjacent battery cells. The first side plate is provided with a first through hole. The first through hole penetrates the first side plate along a first direction. The first through hole is in communication with part of the first space. The first gel body is at least partially arranged in the first space. The first through hole is configured to arrange a first insulating material in the first space to form the first gel body. The first gel body can improve the heat conduction capacity between the battery cells and the shell. The first through hole is also conducive to the ventilation and heat dissipation of the battery pack and conducive to improving the air tightness of the battery pack.

This invention relates to a combined thermal and energy storage frequency regulation system based on composite energy storage, condensate frequency regulation, and boiler overshoot. The system comprises: a composite energy storage subsystem, enabling different types of batteries to participate in different types of frequency regulation command requirements; a condensate throttling frequency regulation response subsystem, which participates in auxiliary regulation when the composite energy storage subsystem cannot meet the grid frequency regulation response requirements; a frequency regulation response subsystem, which controls the composite energy storage subsystem, condensate throttling frequency regulation response subsystem, boiler overshoot control subsystem, and turbine main steam control valve to jointly participate in frequency regulation response based on the received frequency regulation command and the actual unit output; and a boiler overshoot control subsystem, which sets an overshoot amount based on the load command when the frequency regulation response subsystem receives a long-duration, large-amplitude frequency regulation command, adjusting the amount of water and coal entering the boiler. Compared with existing technologies, this invention has advantages such as minimizing power generation coal consumption and equipment wear, improving the battery life of the energy storage system, and reducing initial investment costs.

The application provides a modified ternary positive electrode material and a preparation method and application thereof. The modified ternary positive electrode material comprises a ternary positive electrode material matrix and a coating layer. The coating layer comprises a first coating layer existing on the surface of the ternary positive electrode material matrix and a second coating layer existing on the surface of the first coating layer. The first coating layer comprises Al2O3. The second coating layer comprises Li3AlF6 and LiF. The modified ternary positive electrode material provided by the application has high specific capacity, excellent cycle stability and excellent rate performance by doping boron elements in the matrix phase and constructing a specific double-layer coating layer on the surface of the matrix.

The application discloses a preparation method of a lithium nickel cobalt manganese oxide ternary positive electrode material and belongs to the technical field of lithium ion batteries. The lithium nickel cobalt manganese oxide ternary positive electrode material is prepared by the following steps: synthesizing Y-containing nickel cobalt manganese hydroxide by adopting a co-precipitation method, then doping N and synthesizing the lithium nickel cobalt manganese oxide material by adopting a high-temperature solidification sintering method, and then coating N-containing yttrium titanate (N-YTO) on the surface of the lithium nickel cobalt manganese oxide material by adopting a sol-gel method. The preparation process is simple and easy to operate, Y and N are uniformly doped in the bulk phase, the N-YTO coating layer is uniformly distributed on the surface of the material, the N-YTO coating layer can effectively inhibit the occurrence of internal micro-cracks of particles, electrolyte corrosion and side reactions, can improve the diffusion efficiency of lithium ions and the structural stability, and can further improve the voltage platform, the cycle life, the rate performance and the thermal safety of the lithium nickel cobalt manganese oxide ternary positive electrode material, and the lithium nickel cobalt manganese oxide ternary positive electrode material is suitable for large-scale production.

The invention discloses an amorphous iron-based silicon-phosphorus composite negative electrode material and a preparation method and application thereof, the raw materials of the iron-based silicon-phosphorus composite negative electrode material comprise an iron element, a silicon element, a phosphorus element and a carbon material, the molar ratio of the silicon element to the phosphorus element is 2: 1-1: 2, the molar ratio of the silicon element to the iron element is 8: 1-1: 2, and the mass ratio of an iron / silicon / phosphorus mixture to the carbon material is 5: 5-8: 2; the iron-based silicon phosphorus composite negative electrode material is prepared by a one-step or multi-step mechanical ball milling method. In the iron-based silicon phosphorus composite negative electrode material, the introduction of the iron elementary substance induces the microstructure to be disordered and reduces the lithium ion diffusion energy barrier, and meanwhile, the iron elementary substance and the lithium phosphide formed in situ respectively provide abundant electron and ion transmission paths and cooperatively buffer the huge volume deformation of the silicon negative electrode in the lithiation / delithiation process; furthermore, the electrochemical reversibility, the cycling stability and the rate capability of the material in the lithium storage process are effectively improved.

This invention relates to a hollow molybdenum diselenide microsphere and its preparation method. The product is prepared by the following steps: ammonium molybdate is weighed and dissolved in deionized water, stirred until completely dissolved; dopamine hydrochloride is then added to the resulting solution and stirred until homogeneous; anhydrous ethanol is added to the resulting solution and stirred until homogeneous; ammonia is added dropwise to the resulting solution; the resulting solution is allowed to stand at room temperature for a period of time, washed, and dried to obtain a precursor; the obtained precursor and selenium powder are placed in an inert atmosphere and calcined in a sealed environment, then naturally cooled to room temperature to obtain the hollow molybdenum diselenide microsphere. The beneficial effects of this invention are: it can suppress the shuttle effect of polysulfides through strong electronic interactions with polysulfides, promoting the catalytic conversion process of polysulfides, making it an ideal high-efficiency electrocatalyst; simultaneously, the hollow structure can physically confine polysulfides, thereby effectively suppressing the shuttle effect of polysulfides.

The application relates to the technical field of optics and discloses an imaging device, a head-up display system and a vehicle, which are used for relieving the problem that in the related art, in order to realize large-scale magnification of an image, the projection distance or the magnification of a curved mirror imaging light path is increased. The imaging device comprises an image output element, a polarization light splitting element and a polarization state conversion assembly. The image output element is used for outputting first polarized light; the polarization light splitting element is arranged on the light output side of the image output element and is used for reflecting the first polarized light and transmitting second polarized light perpendicular to the polarization direction. The polarization state conversion assembly is arranged on one side of the polarization light splitting element, is used for receiving the first polarized light from the polarization light splitting element, converts the first polarized light into second polarized light, and makes the second polarized light shoot towards the polarization light splitting element. The first polarized light is modulated by the polarization light splitting element and the polarization state conversion assembly, so that the light is deflected multiple times, thereby realizing magnification of the image.

The invention belongs to the technical field of electronic materials and devices, and discloses an all-fiber structure vertical organic electrochemical transistor and a preparation method thereof.The all-fiber structure vertical organic electrochemical transistor is composed of a lower electrode layer, a semiconductor active layer and an upper electrode layer, and the upper electrode layer and the lower electrode layer are ion permeable electrode layers; the porous PAN / PVP nanofiber membrane is composed of a porous PAN / PVP nanofiber substrate and a metal conductive layer, the semiconductor active layer is an electrospun PEDOT: PSS / PAm nanofiber membrane treated by DMSO (dimethylsulfoxide); the preparation method comprises the following steps: firstly, respectively preparing the ion permeable electrode layer and the semiconductor active layer, and then assembling the upper electrode layer, the semiconductor active layer and the lower electrode layer into the all-fiber structure vertical organic electrochemical transistor. The vertical organic electrochemical transistor with the all-fiber structure is more compact in structure, higher in channel utilization rate and shorter in ion transport path, and the signal amplification performance and the time response performance of a device are greatly improved.

The utility model provides a brightening and magnifying imaging device based on a super-structure lens array, which comprises a plurality of image light-emitting arrays, a first lens module and a second lens module which are sequentially arranged along the light propagation direction, the first lens module can regulate and control the phase and the amplitude of an incident beam, the second lens module is arranged at the downstream of a light path of the first lens module, and the second lens module is arranged at the downstream of a light path of the second lens module. According to the utility model, after the image light-emitting array realizes shaping and convergence of distributed light beams through the lens module I, achromatic convergence and amplification are carried out on the regulated light beams through the lens module I and the lens module II, and finally an amplified image is formed. The problems that in the using process of the super-structure lens, due to the fact that a single super-structure lens is limited by the focal length and the size in the aspects of brightening and magnifying imaging, the occupied space is large, and the super-structure lens cannot be suitable for high-resolution imaging in a small space are solved.

This invention discloses a method for preparing electrode slurry for high-rate lithium batteries and its coating process, belonging to the field of lithium battery technology. Using chitosan as a carbon source, modified titanium carbide nanosheets are composited with nickel-cobalt-doped silicon spheres via glutaraldehyde crosslinking. High-temperature carbonization forms a carbon coating. The carbon-coated composite porous microspheres are then mixed with nano-copper powder, conductive carbon black, and sodium carboxymethyl cellulose solution, and subjected to gradient stirring to obtain the electrode slurry for high-rate lithium batteries. This invention utilizes the synergistic effect of metal-doped porous silicon spheres and modified titanium carbide nanosheets with carbon coating to construct a conductive network, allowing metal ions to be uniformly anchored on the surface and within the pores of the silicon spheres. This improves the conductivity of the silicon-based material and alleviates particle pulverization caused by silicon volume expansion. The carbon coating forms a "core-shell" structure, achieving high conductivity and high rate capability in the electrode slurry.

This invention discloses an ultra-high nickel single-crystal cathode material and its preparation method, belonging to the field of lithium battery technology. The preparation method includes: preparing Ni and Mn continuous gradient precursors in three reactors in series; achieving tungsten / molybdenum and zirconium / titanium dual-element gradient doping through layered spraying; completing crystallization and surface reconstruction through four-stage oxygen-controlled sintering; constructing fast ion channels through directional pore formation; and constructing a three-dimensional conductive network through CVD deposition and nitrogen doping. The resulting cathode material exhibits a gradient structure that alleviates phase transition stress, directional mesopores that improve rate capability, and a three-dimensional network that stabilizes the interface. It maintains >85% capacity retention after 1000 cycles at 4.5V, >95% capacity retention at 5C, and <0.5mL / g of gas generation at high temperatures. The particles show no cracks after cycling, combining high capacity, fast charging, long cycle life, and high safety, making it suitable for high-energy-density power batteries.

This application relates to an in-vehicle microphone (MIC) conversion circuit. The in-vehicle MIC conversion circuit includes: a MIC input amplifier circuit, a MIC signal conversion circuit, and a noise reduction circuit; the MIC input amplifier circuit amplifies the MIC signal and outputs an amplified first signal; the MIC signal conversion circuit is connected to the MIC input amplifier circuit, and processes the first signal to obtain a second signal with an AC component opposite to the first signal; the noise reduction circuit is connected to the MIC signal conversion circuit. The solution provided by this application has lower cost and higher amplification factor, voltage adaptability, and adjustability.

A zoom optical system according to an embodiment of the present application includes, arranged in order from an object side to an image side, a first lens group, a second lens group, a third lens group, and a fourth lens group, wherein each of the first lens group to the fourth lens group includes at least two lenses, the second lens group and the third lens group are movable, and an effective focal length (EFL) at a wide angle is defined by the following expression: EFL = H / 2 tan (A / 2) where EFL wide refers to the effective focal length of the zoom optical system at the wide angle, and H imageD refers to half of the diagonal length of an image sensor pixel area.

The invention discloses a composite negative electrode material, a preparation method thereof and a lithium ion battery, and belongs to the technical field of batteries, the composite negative electrode material comprises a core body and a shell wrapping the core body, the core body comprises Fe-B co-doped Si with Si-Fe alloy attached to the surface, and the shell comprises an amorphous carbon layer with SiC growing on the surface. According to the composite negative electrode material, Fe-B is co-doped with Si to form a core body, and B doping can increase the hole concentration so as to improve the carrier mobility, so that the electron and ion transfer rate of silicon is improved, and the intrinsic conductivity and multiplying power of silicon are improved; meanwhile, the Si-Fe alloy phase, the amorphous carbon layer and SiC growing on the surface of the amorphous carbon layer are matched with one another, so that volume expansion of silicon during charging and discharging can be effectively inhibited, and a transmission channel for lithium ions is provided, so that the cycle performance and the rate capability of a lithium ion battery prepared from the silicon-based composite negative electrode material are improved.

The utility model relates to the technical field of microphone circuits, and discloses an earphone microphone amplifying circuit for internal communication. Comprising a link socket J4, a resistor R47, a resistor R51, a coupling capacitor C36, a resistor R54, a capacitor C62, an operational amplifier chip U1A, a coupling capacitor C46, a resistor R86, a capacitor C61, a selection channel ESWS3, a resistor R63, a resistor R50, a resistor R59, a capacitor C60, a resistor R49, a field tube Q11, a coupling capacitor C33, a resistor R48, a resistor R57, a coupling capacitor C4, a triode Q23, a resistor R52, a resistor R85 and a capacitor C41. According to the invention, the influence of external interference on sound signals is reduced, sound distortion and noise are effectively reduced, and the definition and accuracy of internal communication are improved; compared with the prior art, the circuit provided by the utility model enhances the amplification capability of weak signals, improves the communication reliability, is simple and reasonable in structure, reduces the use of unnecessary elements, reduces the cost and power consumption, improves the stability of the circuit, and provides an earphone microphone amplification solution with better performance for an internal communication system.

The invention relates to the technical field of lithium ion batteries, and discloses a composite coated ternary positive electrode material as well as a preparation method and application thereof. According to the composite coated ternary positive electrode material provided by the invention, the antimony element is doped in the matrix, so that the crystal structure can be stabilized by Sb < 5 + > with high valence and large ion radius, and the mixed arrangement of cations is reduced; the cobalt and lithium elements of the first coating layer can form a stable spinel structure on the surface of a matrix, and interface side reaction is inhibited; surface coating of the tungsten element, the aluminum element, the titanium element and the zirconium element inhibits interface side reaction, the structural stability of the positive electrode material is improved, and the cycling stability and the thermal stability of the lithium ion battery are further improved.