39results about How to "Increase discharge current" patented technology

An air cathode having a multilayer structure is composed of at least one substrate, two diffusion layers and three activation layers. The two diffusion layers are laminated over an upper side of the substrate and a lower side of the substrate. The three activation layers are respectively laminated over one of the two diffusion layers in order. Different loadings or different kinds of catalysts are added into a slurry to form the activation layers, and the activation layers and the diffusion layers are made through simultaneous sintering, thereby shortening the processing time. When the air cathode is used as the cathode of the Zinc-Air battery, the electrolyte inside the Zinc-Air battery will not be influenced by the outside air, and the problem of maintaining the water content of the zinc anode of the Zinc-Air battery can be efficiently overcome.

The invention discloses a discharge electrode structure of a plasma air purification device. The electrode structure comprises a positive electrode group and a negative electrode group, wherein at least one of the positive electrode group and the negative electrode group is wrapped with insulating medium; and the two electrode groups contact directly, such that a contact point is formed. According to the invention, the discharge electrode structure is applied to the plasma air purification device, so a great amount of low temperature plasma is generated at an electrode intersection and a nearby area of the electrode intersection through the structure; the low temperature plasma has properties of glow-like plasma, wide sterilization range, high sterilization rate, short time consumption and low power consumption; in addition, the adopted net-like structure can not only ensure good air permeability but also enlarge the actual plasma function area, therefore, the sterilization rate is further improved.

The invention relates to a pulse plasma thruster with a ceramic nozzle on the side wall, comprising: a high-voltage power supply, an energy storage capacitor, a propellant, a ceramic nozzle, an anode, a cathode, a semiconductor spark plug, an ignition control circuit board, and a feed spring. Wherein, the nozzles are wedge-shaped, and are installed in pairs on the side between the anode and the cathode on the inner wall of the thruster casing, and the installation position is as close as possible to the surface of the propellant. The end face of the ceramic nozzle near the electrode is designed to have a 45° chamfer. This type of nozzle can effectively improve the acceleration performance of the slow neutral gas during the working process of the thruster. At the same time, compared with the electrode-type nozzle, the side-wall nozzle can minimize the influence of the nozzle on the discharge channel, reduce the resistance of the main discharge circuit and obtain a higher discharge current. The new nozzle can reduce the loss of electromagnetic acceleration force and obtain higher thrust and work efficiency.

The invention discloses a power lithium-ion battery with heat dissipation performance, comprising a positive electrode pole piece, a negative electrode pole piece and an isolating membrane, wherein the positive electrode pole piece and the negative electrode pole piece comprise a current collector and an active material membrane coated on the current collector; the current collector is provided with a plurality of extending parts in an extending manner in the width direction; when the positive and negative electrode pole pieces and the isolation membrane coil to form battery cells, the extending parts arranged on the current collectors of the positive and negative electrodes are fixed together to respectively form positive and negative electrode tabs; the above battery cells are connected with the external circuit electrically through the positive and negative electrode tabs. In the lithium-ion battery with the above structure, the positive and negative electrode pole pieces are provided with tabs constituted by the plurality of the extending parts, thus greatly increasing the distributary capability during charge-discharge of great current of current collector tabs, and lowering internal resistance of the battery. When the battery emits heat, heat dissipation can be carried out through multiple extending parts of current collectors.

The invention discloses a discharge electrode structure of a plasma air purification device. The electrode structure comprises a positive electrode group and a negative electrode group, wherein at least one of the positive electrode group and the negative electrode group is wrapped with insulating medium; and the two electrode groups contact directly, such that a contact point is formed. According to the invention, the discharge electrode structure is applied to the plasma air purification device, so a great amount of low temperature plasma is generated at an electrode intersection and a nearby area of the electrode intersection through the structure; the low temperature plasma has properties of glow-like plasma, wide sterilization range, high sterilization rate, short time consumption and low power consumption; in addition, the adopted net-like structure can not only ensure good air permeability but also enlarge the actual plasma function area, therefore, the sterilization rate is further improved.

The invention discloses a button cell, comprising a positive cap, a positive plate, a diaphragm, a lithium sheet and a negative cap, which are stacked successively, wherein a current collection grid is arranged between the positive cap and the positive plate; the current collection grid comprises a plurality of parallel current collector sheets curved and bent repeatedly relative to a base plane of the current collection grid; the repeatedly curved and bent current collector sheets provide elasticity for the current collection grid, absorb an internal dimension error due to large dimensional tolerance of internal components of the cell or consumption of interior materials, and ensure and always maintain good contact effect and conductivity between internal components of the cell, thereby reducing the internal resistance of the cell, and increasing the discharging current and the cell capacity. The invention also discloses a button cell current collector which comprises the current collection grid, wherein the current collection grid comprises the plurality of parallel integrated impact-molded current collector sheets curved and bent repeatedly relative to the base plane of the current collection grid. The current collector ensures and always maintains a good contact effect for the interior of the cell to which the current collector is applied, reduces the internal resistance of the cell, and increases the discharging current and the cell capacity.

The invention discloses an IGBT drive circuit and belongs to the technical field of an electronic circuit. In a switch-off phase, variable-slope drive is employed; a switch-off process is divided into two phases through special size design of a resistor R and a fifth inverter INV5; in the T2 to T3 phase, only a first NMOS transistor MN1 is switched on, and the circuit is in a slow discharge state, so overshoot voltage is improved and the surge voltage problem occurring in a switch-off period is solved; and in the T3 to T4 phase, a second NMOS transistor MN2 is switched on after delay time designed through the resistor R and the fifth inverter INV5, the circuit enters a fast discharge state, the switch-off process of the whole IGBT is accelerated, switch losses is reduced, a discharge current is increased, and the trailing time is greatly reduced. According to the circuit, an extra RC passive absorption network is unnecessary; the damping losses resulting from a traditional RC absorbing circuit are avoided; the pull-down capability of the drive circuit of the switch-off process is ensured; a resistance value in the latter stage is relatively low, so the circuit is high in dv / dt resistance; and the electromagnetic interference property of the integrated circuit is improved.

The invention relates to a high-energy accumulator of active nano carbon fiber belonging to technique of accumulator. It is composed of battery jar, capping, electrolyte, positive and negative polar plates, diaphragm and positve and negative electrodes. The positive polar plate consists of grating of aluminium plate and layer of active nano carbon fiber. The negative polar plate consists of grating of copper plate and layer of active nano carbon fiber. Diameter of the carbon fiber is 20-300nm. Spacing intervals of each group of positive, negative polar plates and diaphragm are small so as to provide large capacity. It is Equivalent to parallel connectino between the large capacity and accumulator. The diaphragm is prepared by use of macromolecular non-woven fabric with high dielectric strength.

The invention discloses a high-voltage static module for fume separation and an extractor hood with the high-voltage static module. The high-voltage static module comprises a static electrode and a collection electrode. A fume channel is formed in an insulation outer frame of the static electrode. First electrode plates and second electrode plates in mutual electric isolation are arranged in the insulation outer frame. The first electrode plates and the second electrode plates extend along the fume channel. The multiple first electrode plates and the multiple second electrode plates are arranged and are arranged in a staggered manner. Electric isolation space is formed between the adjacent first electrode plates and second electrode plates. A sawtooth shape is formed on one side of each first electrode plate in the direction of the fume channel. The collection electrode is used for collecting fume particles which are electrified in the fume channel and flow into collection space. According to the high-voltage static module for fume separation, the separation degree of fat in fumes can be increased, accumulation of the fumes in a draught fan pipeline can be reduced, and the service life of the extractor hood can be prolonged.

The invention discloses an insulated gate bipolar transistor (IGBT) driving push-pull circuit, which mainly comprises an NPN triode (Q1), a PNP triode (Q2), a charging resistor (R5) and a discharging resistor (R6), wherein one end of the charging resistor (R5) is connected to an anode of an input power supply (VDC1), and the other end of the charging resistor (R5) is connected to a collector (c1) of the NPN triode (Q1); an emitter (e1) of the NPN triode (Q1) and an emitter (e2) of the PNP triode (Q2) are connected to form a point and connected with a gate (G) of an IGBT; the emitter (e2) of the PNP triode (Q2) is connected with one end of the discharging resistor (R6); and the other end of the discharging resistor (R6) is connected with the ground of a power supply (VDC2). By adoption of a push-pull circuit structure, in the turn-on moment of the IGBT, the NPN triode works in a saturation area, charging current is improved, and the loss of the NPN triode is reduced; and in the turn-off moment of the IGBT, the PNP triode works in the saturation area, discharging current is improved, and the loss of the PNP triode is reduced.

A system and method for mitigating the possibility of missing ignition coil commands is presented. In one example, one or more ignition coils may not be charged and / or discharged during a cylinder cycle in response to the absence of a voltage pulse forming at least a portion of an ignition coil command.

The invention discloses a cellular cavity-stage integrated fuel cell electrode and a preparation method of the fuel cell electrode and belongs to the field of a fuel cell. Integrated design and manufacture of a cellular porous structure diffusion layer and a catalyst layer is contained. The cellular porous structure is formed by using a conductive 3D printing material to fast print. A cavity, a collector plate, the diffusion layer and the catalyst layer of the cellular porous structure in the cellular cavity-stage integrated fuel cell electrode are integrated to break through a design manner of separating the cavity, the collector plate, the diffusion layer and the catalyst layer in a traditional fuel cell. In the cellular porous structure, second-stage channels are distributed on the basis of first-stage channels, and therefore, such design greatly increases the catalytic activity superficial area, reduces mass transfer resistance and greatly improves discharging current of the electrode, and enables the structure of the electrode to be simple and compact, and the assembly and sealing to be convenient and easy.

The new type of film cell has film energy storing system based on meal aluminum and iodine. The film cell can provide low current density of microampere / sq cm level, discharge platform of 400-1000 mV and discharge capacity of 100 microampere.hr / sq cm level. The I2 / A film cell may be prepared in large scale and simple process, and has light weight, no toxicity, low cost, environment friendship and other advantages. It may be used as the power source in artificial pacemaker, intelligent card, implantable medical device and MEMS. Furthermore, I2 / A film cells may be connected parallelly or serially to constitute power supply with great capacity and wider application.

The invention provides a transfer-type real-time battery equalizer with a bidirectional synchronous rectification function, and relates to the technical field of battery management. The transfer-typereal-time battery equalizer comprises a square wave signal generator, an electronic switch, a pulse shaping and driving circuit, a pulse width control circuit, a relative voltage comparison and fuzzycontrol circuit, a synchronous rectification control circuit and an energy exchange circuit. By detecting and controlling relative voltage difference between adjacent batteries in real time, the electric energy transferring equalization function is involved and achieved in real time and is nothing to do with an actual voltage of a single battery and a state of a battery pack, batteries in arbitrary numbers are connected in series, the size of an equalization current is automatically adjusted according to the relative voltage difference, the equalization current and the efficiency are substantially improved by a bidirectional synchronous rectification technology, the problem of short service lifetime caused by non-consistency of the battery pack is solved, and rapid attenuation and thermalrunaway of the battery pack are effectively controlled. The transfer-type real-time battery equalizer is low in cost and long in effective equalization time, the battery capacity utilization rate is improved, and the transfer-type real-time battery equalizer is particularly applicable to a large-capacity power lithium battery pack, a single 2V lead-acid storage battery pack, a supercapacitor bankand the like.

This invention relates to lithium ion battery negative modifying method, which comprises the following steps: solving sodium sulfo benzoate, tosylic acid and pyrrole into water to process mixture; then mixing the lithium battery negative active materials, conductive carbon and adherent agent to process mixture and adding 1-cymene and 2-pyrrolidone to process plasm; finally coating plasm on the flow aluminum foil and after drying to process the lithium ion negative electrode to dip into mixture liquid and washing out of the impurity in ion water with flow density of 0.1-1.0mA / cm2 for 1-300 seconds polymerizing under temperature of 60-300deg C for heating for 1-48 hours.

The invention discloses a processing device for a wire diamond-like coating. The processing device comprises a paying-off coil used for wire paying-off and a take-up coil used for take-up connection and further comprises a diamond-like coating discharge tube arranged between the paying-off coil and the take-up coil and used for processing the diamond-like coating on a wire. The diamond-like coating discharge tube comprises a discharge tube main body which comprises a magnetic solid boot ring, an insulating sleeve, electrodes and a water cooled jacket. A plurality of sets of magnets are mountedon the magnetic solid boot ring, and magnetic solid boot rotating teeth are fixed to the magnetic solid boot ring and externally connected with a transmission structure so that the magnetic solid boot ring can be rotated. Magnetron sputtering can be conducted on the surfaces of miniature pieces and wire pieces to achieve PECVD of the diamond-like coating under the high vacuum, and large-beam flows can further be generated on the miniature pieces and the wire pieces to achieve high-ionization spraying of the wire diamond-like coating through annular tube gas discharge under the low vacuum.

A system and method for mitigating the possibility of missing ignition coil commands is presented. In one example, one or more ignition coils may not be charged and / or discharged during a cylinder cycle in response to the absence of a voltage pulse forming at least a portion of an ignition coil command.

The invention discloses a safety lead storage battery comprising a casing. The casing is internally provided with a positive electrode and a negative electrode, the top end of the positive electrode is a positive output electrode, the negative electrode is a negative output electrode, the positive electrode and the negative electrode are in an electrolyte, a flexible flocculent fiber insulation mat is disposed in the electrolyte, and a silicon separator is connected between the positive output electrode and the negative output electrode. The safety lead storage battery has a reverse conductingfunction by adding the silicon separator, therefore, the problem of the permanent damage to the lead storage battery caused by the phenomena of the falling of a battery plate and the breakdown of anion separator brought by a reverse charging phenomenon is solved, the problems of electrolyte leakage and incomplete sealing are solved by replacing the ion separator with the flexible flocculent fiber insulation mat, the corrosion damage to equipment caused by leakage of the electrolyte is avoided, and the lead storage battery is protected.

The present invention discloses a resonant type lithium battery device with a damping function. At least one identical battery stack is connected in series and in parallel so as to form the resonant type lithium battery device; each battery stack includes a lithium-ion battery and a lithium-polymer battery; the lithium-ion battery and the lithium-polymer battery are connected in parallel; the lithium-ion battery is a current type batter, so that discharging can be benefitted; the lithium-polymer battery is a voltage type battery, so that charging can be facilitated; the voltage of the lithium-ion battery is the same as or close to the voltage of the lithium-polymer battery; and the lithium-ion battery and the lithium-polymer battery will generate a resonance damping effect due to a voltage automatic balance relation, and therefore, rapid charging and rapid discharging can be performed, temperature rise can be avoided, and the service life of the lithium battery device can be prolonged.

The invention discloses a coaxial hollow cathode discharge fraction hydrogen catalytic reaction generator, and belongs to the novel hydrogen energy research field. The generator solves the problem of low fraction hydrogen reaction intensity because improvement on plasma density and temperature cannot be realized during acquiring the fraction hydrogen by adopting the conventional hollow cathode discharge mode. A double-cylinder cathode and a single-cylinder anode are positioned in a reaction vacuum tube and arranged coaxially with the reaction vacuum tube, the bottom of the double-cylinder cathode extends into the upper port of the single-cylinder anode or is arranged opposite to the upper port of the single-cylinder anode, the center of the lower bottom surface of the single-cylinder anode is provided with an anode circular hole, and side walls of the single-cylinder anode are fixedly connected with a tungsten rod binding post respectively; and an inner cylinder of the double-cylindercathode extends from an outer cathode hole in the center of the upper bottom surface of an outer cylinder and is hermetically fixed with the outer cylinder, the upper end of the inner cylinder is positioned outside the outer barrel and fixedly connected with one end of a bracket, the other end of the bracket is fixedly connected with the two tungsten rod binding posts, and the two tungsten rod binding posts pass through the upper bottom surface of the reaction vacuum tube.

The invention discloses a strip cathode wire for an electrostatic dust collector. The strip cathode wire comprises a cathode pole (1), wherein a strip discharge rack (2) is arranged on the cathode pole (1), and is arranged in the length direction of the cathode pole (1); and angular discharge tips (3) are arranged on the discharge rack (2) at intervals. The strip discharge rack is arranged on the cathode pole in the length direction of the cathode pole, and the number of the discharge rack and the structure and number of the discharge tips on the discharge rack are limited, so that the electrostatic dust collector using the cathode wire has the characteristics of low corona onset voltage and high discharge current; and meanwhile, as the set mode of the discharge rack enables dust captured by the cathode wire to be difficultly bonded and conveniently cleaned, the problems of easy bonding of the captured dust on the cathode wire in a corona dead area and difficult cleanness in an original electrostatic dust collector are preferably solved, and the dust and mist removing efficiency of the electrostatic dust collector is further improved.

The invention discloses a spiral cathode wire for an electrostatic precipitator. The spiral cathode wire comprises a cathode wire body (1), wherein the cathode wire body (1) is formed by folding a sheet body along the length direction into a body with a Z-shaped section in the width direction and then twisting the body with the Z-shaped section into a spiral body, and a sharp-corner-shaped discharge sharp end (2) is arranged on the spiral part of the cathode wire body (1). The cathode wire body is formed by folding the sheet body along the length direction into the body with the Z-shaped section in the width direction and then twisting the body with the Z-shaped section into the spiral body and the sharp-corner-shaped discharge sharp end (2) is arranged on the spiral part of the cathode wire body (1), so that the cathode wire has the characteristics of low corona voltage and high discharge current, is capable of changing gas into a turbulent flow by means of a baffling channel on the cathode wire body to increase thrust of the gas towards a dust collecting electrode, and facilitates the acting of electric field force; dust collected by the cathode wire is difficult to adhere and convenient to clean; the cathode wire has the characteristics of being simple in structure, easy to manufacture and install, and suitable for popularization and use.

The invention relates to an interfacial modification membrane for a solid electrolyte for a lithium battery and a preparation method thereof. The interfacial modification membrane for the solid electrolyte for the lithium battery is characterized in that a layer of interfacial modification membrane is attached to one face or both faces of a solid electrolyte. The preparation method of the interfacial modification membrane comprises the following steps of: (1) selecting a fast-ionic conductor or a uniform mixture of a lithium-ion active material and water; (2) forming a target material by compressing the fast-ionic conductor or the uniform mixture, sintering the target material for 3-24 hours at the temperature of 500-1200 DEG C, and then, carrying out natural cooling with a furnace; and (3) attaching the target material to the face or the both faces of the solid electrolyte through magnetron sputtering, laser evaporation or electron beam evaporation, thereby obtaining the interfacial modification membrane for the solid electrolyte. According to the interfacial modification membrane for the solid electrolyte for the lithium battery and the preparation method thereof, as the layer of interfacial modification membrane is attached to the face / faces of the solid electrolyte playing a diaphragm role, the interfacial impedance between the solid electrolyte and an electrolytic solution and other types of electrolytes is reduced, the ion transmission capacity of an interface layer of the solid electrolyte is improved, and the discharge performance of the battery is effectively improved; and the preparation method is simple, and the large-scale production is facilitated.

The invention discloses an active pull-down circuit for driving a capacitive load. The active pull-down circuit comprises an input unit, a driving unit and a delay unit, the input unit is connected with the driving unit and used for converting inputted signals into differential signals, the driving unit is connected to the delay unit, is used for providing active driving current and shares and redistributes current of a driving current source, and the delay unit is used for controlling the driving current source in the driving unit after delaying outputted signals. When high-level output is switched to low-level output, the load capacitor is quickly discharged and when low-level output is switched to high-level output, the load capacitor is quickly charged, so that high-level outputted signals and low-level outputted signals are quickly switched. The capacitive load is quickly driven under conditions without increasing power consumption or obviously increasing the area and the complexity of the circuit, and the active pull-down circuit has the advantages of simplicity, low power consumption, fast working speed, high driving capacity and the like.

An IGBT driving circuit belongs to the technical field of electronic circuits. In the turn-off stage, variable slope driving is adopted, and the turn-off process is divided into two stages through the special size design of the resistor R and the fifth inverter INV5. From T2 to T3, only the first NMOS transistor MN1 is turned on, and the circuit is in a slow state. The discharge state is conducive to improving the overshoot voltage and solving the problem of surge voltage generated during the turn-off period; from T3 to T4, after the delay designed by the resistor R and the fifth inverter INV5, the second NMOS transistor MN2 is turned on , the circuit enters a fast discharge state, which accelerates the turn-off process of the entire IGBT, reduces switching losses, and increases the discharge current, which greatly reduces the tailing time; the invention does not require an additional RC passive absorption network, avoiding the traditional RC absorption The damping loss caused by the loop; because the pull-down capability of the drive circuit during the turn-off process is guaranteed, and the resistance value of the latter stage is low, the circuit can resist higher dv / dt and improve the electromagnetic interference characteristics of the overall circuit.

The invention discloses a heavy-duty vehicle starting emergency power system with EDLC capacitors, and specifically relates to the field of low-temperature starting power systems for automobiles. Starting power supply device; EDLC capacitor starting power supply device is composed of EDLC capacitor, microcontroller, relay, sensor, clock / pulse width modulation module and automatic control switch, and integrated on the system circuit board; the battery is charged to the EDLC capacitor through a boost charging circuit Charge. The system of the present invention utilizes the characteristics of large capacitance, long charge and discharge life, short charging time, high discharge current, small internal resistance and wide normal operating temperature range, etc., and replaces part of the energy and power supply of the storage battery through electronic control technology The energy of the system battery is released at the right time, which improves the effective energy and starting ability of the car power supply.

The invention relates to a rechargeable aluminum air battery based on sunlight assistance and a preparation method thereof. According to the technical scheme, the method comprises the following steps: preparing an air photoelectrode: preparing a mixed solution of potassium iodide and bismuth nitrate pentahydrate, adjusting the pH value by using dilute nitric acid, dropwise adding a prepared p-benzoquinone ethanol solution into the solution, stirring, depositing BiOI on conductive glass by using an electro-deposition method, performing washing, and performing airing; finally, dropwise adding a dimethyl sulfoxide solution of vanadyl acetylacetonate onto BiOI, calcining, performing cooling to room temperature, immersing into a NaOH solution, washing with deionized water, and performing natural airing to obtain the BiVO4 photoelectrode. The material with excellent photocatalytic activity and stability is prepared, and the charging voltage can be greatly reduced by introducing sunlight. According to the invention, collaborative conversion of solar energy, chemical energy and electric energy is realized, and a new way is opened up for the rechargeable aluminum air battery.

The invention discloses a button cell, comprising a positive cap, a positive plate, a diaphragm, a lithium sheet and a negative cap, which are stacked successively, wherein a current collection grid is arranged between the positive cap and the positive plate; the current collection grid comprises a plurality of parallel current collector sheets curved and bent repeatedly relative to a base plane of the current collection grid; the repeatedly curved and bent current collector sheets provide elasticity for the current collection grid, absorb an internal dimension error due to large dimensional tolerance of internal components of the cell or consumption of interior materials, and ensure and always maintain good contact effect and conductivity between internal components of the cell, thereby reducing the internal resistance of the cell, and increasing the discharging current and the cell capacity. The invention also discloses a button cell current collector which comprises the current collection grid, wherein the current collection grid comprises the plurality of parallel integrated impact-molded current collector sheets curved and bent repeatedly relative to the base plane of the current collection grid. The current collector ensures and always maintains a good contact effect for the interior of the cell to which the current collector is applied, reduces the internal resistance of the cell, and increases the discharging current and the cell capacity.

The invention discloses a ternary content addressable memory. The ternary content addressable memory comprises a search line connected with a ternary content addressable memory (TCAM) unit, the search line is provided with a booster circuit; the boost circuit comprises a metal wire which is arranged on one side of the search line and forms a coupling capacitor with the search line, and a boost control unit connected with the metal wire; when the search line is at a high level, the boost control unit sets the metal line to be at a high level; and the metal wire improves the voltage of the local search line at a high level through the coupling capacitance. The voltage of the search line can be further improved when the search line is at a high level, and after the voltage of the search line is improved, the VGS voltage of an NMOS tube for discharging the matching line in the TCAM unit can be increased, so that the discharge current can be increased, the discharge speed of the matching line can be increased, the evaluation speed of the matching line is increased, the search operation efficiency is improved, and the search efficiency is improved. And the working frequency and the performance of the ternary content addressable memory are further improved.

The invention discloses a hydrothermal treatment method of ceramic oxide composite powder. The method comprises the following steps that (1) oxide raw materials are weighed according to the required proportion of ceramics; (2) the oxide raw materials are charged into a ball grinding tank; after deionized water or alcohol is added, full mixing and ball grinding are performed; slurry obtained afterthe ball grinding is put into a drying box to be dried; ceramic oxide composite powder is obtained; (3) the ceramic oxide composite powder is added into a reaction kettle; a certain quantity of de-ionized water is added; then, one or several any kinds of compositions of ammonium hydroxide, citric acid or oxalic acid are added; the reaction kettle is sealed; then, heating is performed for hydrothermal treatment; the powder after the hydrothermal treatment is dried in the drying box. The hydrothermal treatment method has the characteristics that the material consumption is low; the cost is low;the pollution is little; the process is simpler; the process stability is high.